WO2015053473A1 - Signature registration method, signature authentication method and device therefor - Google Patents

Abstract

Disclosed is a signature registration device comprising: an input part for receiving a signature as an input; a detection part for detecting the state of the signature registration device while the signature is inputted; a storage part for registering the inputted signature; and a control part for storing information regarding the detected state of the signature registration device and information regarding the inputted signature.

Description

Signature registration method, signature authentication method and device therefor

The present invention relates to a method for registering a signature for authentication, a method for authenticating a signature by calculating a degree of conformity with a registered signature, a signature registration device, and a signature authentication device.

Signatures are used as a way to verify that users who access digital devices are authorized users. In particular, mobile devices such as mobile phones, PMPs (Portable Media Players), PDAs (Personal Digital Assistants), handheld game machines, digital cameras, digital camcorders, e-books, etc. Signature is used as a way of authenticating the intended user. However, since mobile devices are often used by users while moving or holding them in hand, the performance of signature recognition is lower than that of devices used in fixed locations. In addition, when registering a signature for the first time and attempting to authenticate yourself for the use of the device, the device's state may vary depending on the user's posture, and the input data may also vary. There is a tendency.

The present invention relates to a signature registration device and method, and a signature authentication device and method using information on a posture of a user or a state of a device at the time of signature input in addition to information on an input signature.

1A is a block diagram illustrating a signature registration apparatus according to an embodiment of the present invention.

1B is a block diagram illustrating a signature authentication apparatus according to an embodiment of the present invention.

2 is a flowchart illustrating a signature registration method associated with an embodiment of the present invention.

3A and 3B are diagrams for describing states of a signature registration device and / or a signature authentication device according to an embodiment of the present invention.

4 is a flowchart illustrating a signature authentication method associated with an embodiment of the present invention.

5 is a flowchart illustrating an embodiment of the present invention and a related signature registration and authentication method.

6 is a view for explaining an operation between a device and a wearable device according to another embodiment of the present invention.

7 is a block diagram illustrating a device and a wearable device according to another embodiment of the present invention.

8 is a flowchart illustrating a device signature registration and authentication method according to another embodiment of the present invention.

9 is a flowchart illustrating a device signature registration and authentication method according to another embodiment of the present invention.

10 to 13 are diagrams for explaining an example of a device signature registration and authentication method according to another embodiment of the present invention.

According to an embodiment of the present invention, a signature registration device includes an input unit for receiving a signature, a detector for detecting a state of the signature registration device, a storage unit, information about the detected state of the signature registration device, and the input unit. And a control unit for storing information about the signature in the storage unit, wherein the state of the signature registration device includes one of a fixed state and a grip state.

The detector may include a sensor configured to detect at least one of tilt and acceleration of the signature registration device.

The controller according to an embodiment of the present disclosure may determine the state of the signature registration device to which the signature is input as the fixed state when the detected slope of the signature registration device is within a predetermined range.

The controller according to an embodiment of the present invention may determine the state of the signature registration device to which the signature is input as a fixed state when the sensed acceleration of the signature registration device varies within a predetermined range.

A signature registration method in a signature registration apparatus according to an embodiment of the present invention includes: receiving a signature; Determining a state of the signature registration device detected using a sensor; And storing information on the state of the signature registration device and information on the input signature, wherein the state of the signature registration device includes one of a fixed state and a gripping state.

According to an embodiment of the present invention, a signature authentication device includes an input unit for receiving a signature of a user, a detector for detecting a state of the signature authentication device to which the signature is input, and a status of a pre-registered signature and a signature registration device. A storage unit for storing information, a registration signature previously stored in the storage unit, information about the state of the signature registration device, a signature input through the input unit, and information about the state of the signature authentication device detected by the detection unit; And a control unit for authenticating the input signature using a signature, wherein the state of the signature registration device includes one of a fixed state and a grip state, and the state of the signature authentication device includes one of a fixed state and a grip state. .

According to an embodiment of the present invention, the control unit may be used to calculate a degree of matching between the pre-registered signature and the input signature when the device state when the signature is registered and the state of the signature authentication device are different. You can change the weight.

The control unit according to an embodiment of the present disclosure may change the authentication success threshold value used for authentication of the input signature when the device state when the signature is registered and the state of the signature authentication device are different.

The control unit according to an embodiment of the present invention may change the authentication success threshold used for authentication of the input signature when the device state when the signature is registered and when the state of the signature authentication device is in a holding state. have.

In the signature authentication method in the signature authentication device according to an embodiment of the present invention, the step of receiving a signature of the user, determining the state of the signature authentication device that the signature is input by the sensor, when registering the signature Authenticating the input signature by using information about a pre-registered signature and device status, and information on the input signature and the status of the signature authentication device, wherein the device status when registering the signature; Includes one of a fixed state and a held state, and the state of the signature authentication device includes one of a fixed state and a held state.

The signature authentication apparatus according to an embodiment of the present invention includes an input unit for receiving a user's signature, a storage unit storing pre-stored registration signatures and user state information when registering a signature, and information about the user state from the wearable device. The communication unit for receiving the received signature using the information on the pre-stored registration signature and the user state and the signature input through the input unit and the information on the user state received through the communication unit to the storage unit; And a control unit for authenticating.

The signature authentication method in the signature authentication apparatus according to an embodiment of the present invention includes receiving a signature of a user, receiving information on a user state from a wearable device, and pre-stored registered signatures and pre-registrations when registering a signature. Authenticating the input signature using information on the stored user status and the input signature and the information on the user status received from the wearable device.

The signature authentication apparatus according to an embodiment of the present invention includes an input unit for receiving a user's signature, a detector for detecting a state of the signature authentication apparatus in which the signature is input, a pre-stored registered signature when registering a signature, and a user state. A storage unit for storing information about the device status and information about the device state, a communication unit for receiving information about the user state from the wearable device, the pre-stored registration signature, the information about the user state and the device state stored in the storage unit And a controller for authenticating the input signature by using information and a signature input through the input unit, information about the user state received through the communication unit, and information about a device state received from the sensing unit.

In the signature authentication method according to an embodiment of the present invention, the signature authentication method may include receiving a signature of a user, receiving a status of the device detected by a sensor, and receiving information about a user status from a wearable device. And a pre-stored registration signature when registering a signature, information about a pre-stored user state, information on a pre-stored device state, and information on the input signature and the user state received from the wearable device. Authenticating the entered signature, using information about the state of the.

Terms used herein will be briefly described and the present invention will be described in detail.

The terms used in the present invention have been selected as widely used general terms as possible in consideration of the functions in the present invention, but this may vary according to the intention or precedent of the person skilled in the art, the emergence of new technologies and the like. In addition, in certain cases, there is also a term arbitrarily selected by the applicant, in which case the meaning will be described in detail in the description of the invention. Therefore, the terms used in the present invention should be interpreted based on the meanings of the terms and the contents throughout the present invention, rather than simply the names of the terms.

When any part of the specification is to "include" any component, this means that it may further include other components, except to exclude other components unless otherwise stated. In addition, the terms "... unit", "... module" described in the specification means a unit for processing at least one function or operation, which is implemented in hardware or software or a combination of hardware and software. Can be.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

FIG. 1A is a block diagram illustrating a signature registration device related to an embodiment of the present invention, and FIG. 1B is a block diagram illustrating a signature authentication device according to an embodiment of the present invention.

The signature registration device and the signature authentication device may be physically implemented as one device but may be separate devices. Typically, a user registers a signature through the device and enters a signature for authorization of use rights on the same device. In this case, the signature registration device and the signature authentication device are implemented as the same device. In addition, the signature registration device and / or signature authentication device may be a mobile device such as a mobile phone, a portable media player (PMP), a personal digital assistant (PDA), a portable game machine, a digital camera, a digital camcorder, an e-book, or the like. The present invention may be, but is not limited to, a computing device having a processor capable of processing registration and authentication of a signature.

Referring to FIG. 1A, the signature registration device 100 is a device having a function of first registering a signature to be used for authentication or changing a signature that is already registered. The signature registration apparatus 100 may include an input unit 110, a registration control unit 120, a detection unit 130, and a storage unit 140.

The input unit 110 is for receiving a signature from a user. The input unit 110 may be implemented by a touch input means, but is not limited thereto and may be implemented by other input means such as a mouse. When the input unit 110 is implemented by the touch input unit, the signature registration device 100 may include a touch screen (not shown). The touch screen (not shown) may include a touch panel for receiving a touch and a display screen for displaying a shortcut icon or displaying a result corresponding to the received touch. The touch panel may include various input methods such as a resistive method, a capacitive method, an ultrasonic method, or an infrared method.

In order to prevent unauthorized users from accessing or using the device 100, the user may select a signature registration menu and register a signature on the device 100. The registered signature will be used later to authenticate the access right to the signature registration device 100 or signature authentication device 150.

The detector 130 detects a state of the signature registration device 100 while a signature is input. The state of the signature registration device 100 relates to a condition or situation affecting a user's signature input. For example, whether the signature registration device 100 is in a fixed state or moving state is flat. And it is on the fixed table state, whether it is in the user's hand or shaking state.

The state of the signature registration apparatus 100 may depend on the posture of the user at the time of signature input. That is, the state of the signature registration device 100 may vary depending on a posture in which the user handles the signature registration device 100. For example, when a user inputs a signature for registration while the user places the signature registration device 100 on a table or fixes the signature registration device 100 without shaking, the signature registration device 100 is in a fixed state. would. In addition, when the user inputs a signature for registration while holding the signature registration device 100, the signature registration device 100 will be in a grip state. For example, when a user registers a signature in a state in which the user moves the signature registration device 100 in his or her hand, the signature registration device 100 may be in a gripping state.

The detector 130 may include at least one of an orientation sensor for detecting a pitch of the signature registration device 100 and a speed sensor for detecting an acceleration. The pitch sensed by the orientation sensor refers to the orientation, or tilt, of the device 100. The direction sensor may detect a direction (azimuth, or yaw), a pitch, and a roll corresponding to three dimensions of the device 100 (for example, three axes of x, y, and z axes). have. The speed sensor is for detecting the degree of movement of the device 100. The speed sensor may detect a degree of movement, for example, a change in speed with respect to time or a change in distance with time. The orientation of the device 100 can be calculated using a direction sensor and a speed sensor. In addition, the movement of the device 100 may be calculated using a direction sensor and a speed sensor.

The sensing unit 130 that detects the direction and / or movement of the device 100 may include a proximity sensor, an acceleration sensor, a gyro sensor, or a terrestrial magnetism sensor. Can be.

The storage 140 may store a signature input by the user. Information about the input signature may include the shape of the signature, the speed of the signature input and / or the pressure at the input detected. In addition, information on the state of the signature registration device 100 detected by the detector 130 while the signature is input is also generated by the registration controller 120 and stored in the storage 140. For example, the storage 140 may store information on the slope (or pitch) or acceleration of the signature registration device 100. In addition, the storage 140 may store information on one of a fixed state and a gripped state of the signature registration device 100.

The registration controller 120 generates information on the state of the device 150 while the signature to be registered is input by using the information obtained by the detector 130, and the information on the state of the generated signature registration device. And stores information about the input signature in the storage 140.

The registration control unit 120 of the signature registration device 100 and the authentication control unit 170 of the signature authentication device 150 may both be implemented as a processor, and the signature registration device 100 and the signature authentication device 150 may be one. When implemented as a device, one control unit including a processor will serve as the registration control unit 120 and the authentication control unit 170. However, in the present embodiment, the signature registration device 100 and FIG. 1B shown in FIG. In order to distinguish and describe the signature authentication apparatus 150 shown in FIG.

The registration controller 120 may determine the device state while the signature is input by using at least one of the pitch and the acceleration of the signature registration device 100 detected by the detector 130. For example, the registration controller 120 may determine the device state while the signature is input by using one of the pitch and the acceleration of the signature registration device 100 detected by the detector 130, or both the pitch and the acceleration. Can be. Examples of device states include a fixed state or a grip state.

As shown in FIG. 3A, when the pitch of the device 100 is close to 0 degrees with respect to the flat table, it may be considered that the user is entering a signature with the device 100 placed on a flat table or floor. In this case, the state of the device 100 will be determined to be a fixed state.

As shown in FIG. 3B, when the pitch of the device 100 is within a range of 30 to 45 degrees, which is a predetermined range, based on a flat table, a user who inputs a signature holds the device 100 in a hand-holding position. It may be considered that a signature is being entered, in which case the state of the device 100 will be determined to be a gripping state. It is obvious to those skilled in the art that the range of 30 to 45 degrees is just one example, and other ranges used as criteria for judgment may be used.

The registration control unit 120 detects that the signature registration device 100 is in a fixed state while the signature is input if the detected pitch of the signature registration device 100 is within another predetermined range (for example, -5 degrees to 5 degrees). Otherwise, the device 100 may be determined to be in a gripping state.

The registration controller 120 may generate the posture information of the user, that is, the state information of the device 100 by checking the stability of the sensor value output from the speed sensor. If the device 100 is in a stationary state, the sensor values will be input equally or there will only be stable variations while entering the signature. If the device 100 is in a gripping state, the sensor value will fluctuate frequently as the device 100 is shaken while entering the signature.

The registration control unit 120 varies within a predetermined range (eg, -1.5 = x-axis = 1.5 ㎨, -1.5 = y-axis = 1.5 ㎨, -1.5 = z-axis = 1.5 ㎨) of the detected acceleration change amount. (Eg, stable fluctuations), determine that the signature registration device 100 is stationary while the signature is being entered; otherwise (e.g., fluctuate from time to time), the device 100 is in a holding state. You can decide. The predetermined range of the acceleration change amount may be displayed including the gravitational acceleration unit g as -0.1g = x-axis = 0.1g. Changes in units can be applied to the remaining axes. It will be readily understood by one of ordinary skill in the art that the predetermined range of acceleration variation can be changed.

In determining the state of the device 100, both information about the pitch and acceleration of the device 100 may be used. For example, the pitch of the signature registration device 100 placed on a reading desk inclined at a predetermined angle (for example, 20 to 50 degrees) on a flat table is another predetermined range (for example, 10 to 60 degrees). When the amount of change in the sensor value received from the speed sensor is a stable change, the registration controller 120 may determine the signature registration device 100 as a fixed state while the signature is input. In addition, when the detected pitch of the signature registration device 100 is within a predetermined range (for example, -5 degrees to 5 degrees), and the amount of change in the sensor value received from the speed sensor changes frequently, the registration controller 120 may The signature registration device 100 may be determined to be in a gripping state while the signature is input.

Referring to FIG. 1B, when the user inputs a signature to be used for authentication, the signature authentication device 150 is a device having a function of determining whether the authentication succeeds or not compared to the registered signature. The signature authentication device 150 may include an input unit 160, an authentication controller 170, a detector 180, and a storage 190.

The input unit 160 is for receiving a signature from a user. In order to use the locked device 150, the user inputs a signature through the input unit 160. The input unit 160 may be implemented by a touch input means, but is not limited thereto. When the input unit 160 is implemented by the touch input unit, the signature authentication device 150 may include a touch screen (not shown). The touch screen (not shown) may include a touch panel for receiving a touch and a display screen for displaying a shortcut icon or displaying a result corresponding to the received touch. The touch panel may include various input methods such as a resistive method, a capacitive method, an ultrasonic method, or an infrared method.

The detector 180 detects a state of the signature authentication device 150 while a signature for authentication is input. The state of the signature authentication device 150 affects the accuracy of the signature input by the user. The detector 180 may include at least one of an orientation sensor for detecting a pitch of the signature authentication device 150 and a speed sensor for detecting an acceleration. The sensing unit 180 may include a proximity sensor, an acceleration sensor, a gyro sensor, or a terrestrial magnetism sensor.

The storage 190 may store information about the signature registered by the user and the device state at the time of registering the signature. Information about the input signature may include the shape of the signature, the speed of the signature input and / or the pressure at the input detected. In addition, the information about the signature entered for authentication may include the shape of the signature, the speed of the signature input and / or the pressure at the detected input.

The storage unit 190 may store information about the slope (or pitch) and / or the acceleration of the signature authentication device 150. In addition, the storage 190 may store information about one of a fixed state and a gripped state of the signature authentication apparatus 150.

The storage 190 may store weights for each feature. For example, the storage unit 190 may store the weight for each feature corresponding to the case where the information on the state of the signature authentication device at the time of signature input and the information on the state of the device at the time of signature registration are the same. In addition, the storage unit 190 may store the weight for each feature that is changed when the information on the state of the signature authentication device at the time of signature input and the information on the state of the device at the time of signature registration are different.

The storage unit 190 may store the authentication success threshold. For example, the storage unit 190 may store the changed authentication success threshold corresponding to the case where the information on the state of the signature authentication device at the time of signature input is different from the information on the state of the device at the time of signature registration. In addition, the storage unit 190 may store the changed authentication success threshold corresponding to the case where the information about the state of the signature authentication device at the time of signature input and the information about the state of the device at the time of signature registration are the same.

The authentication controller 170 generates state information of the device 150 while the signature is input by using the information obtained by the detector 180. For example, the authentication controller 170 determines whether the signature authentication device 150 is in a fixed state or a grip state while the signature is input using at least one of the pitch and the acceleration of the signature authentication device 150. . The authentication controller 170 may determine the device state while the signature is input using one of the pitch and the acceleration of the signature authentication device 150 sensed by the detector 160, or both the pitch and the acceleration. The determination of the status of the signature authentication apparatus 150 may be performed in the same or similar manner as the determination of the status of the signature registration apparatus 100.

When the pitch of the signature authenticator 150 is within a predetermined range, it may be determined that the signature authenticator 150 is in a fixed state while the signature is input. If the pitch of the signature authenticator 150 is within another predetermined range, it may be determined that the signature authenticator 150 is in a gripping state.

On the other hand, if the acceleration of the signature authentication device 150 is changed within a predetermined range, it can be determined that the signature authentication device 150 was in a fixed state while the signature was input, otherwise, it was determined to be in a holding state.

The authentication control unit 170 stores the signature and signature inputted through the input unit 160 for authentication and information on the registration signature and the device state at the time of registration of the signature stored in the storage 190. Information about the status can be used to verify the signature entered. The authentication controller 170 compares the registration signature and the input signature, calculates the degree of conformity, and compares the result of the matching degree calculation with the authentication success threshold to determine whether the authentication is performed by the input signature. The calculation of the degree of conformity and the determination of whether the authentication succeeds may refer to the information on the state of the device at the time of signature registration and the information on the state of the signature authentication device 150 when the signature is input for authentication.

The authentication control unit 170 is used to calculate the authentication success threshold and / or the degree of conformity according to the state information of the signature authentication device 150 at the time of signature input and the device state at the time of signature authentication stored in the storage 190. The weight for each feature can be changed.

If the device state at the time of signature input and the device state at the time of signature authentication are both fixed, the accuracy of signature input is high at two points. Therefore, the authentication routine is executed using the set value without changing the authentication success threshold or the weight for each feature. This will be done.

The authentication control unit 170 registers the registered signature according to a result of comparing the information on the state of the signature authentication apparatus 150 at the time of signature input with the information on the state of the device at the time of signature registration stored in the storage 190. It is possible to change the weight for each feature used to calculate the matching degree of the inputted signature for authentication. Features used to calculate the match between two signatures may include the shape of the signature, the speed of the signature input, and the pressure at the detected input. Each feature has a weight indicating the importance in calculating the degree of matching. For example, when calculating the degree of conformity, the degree of conformity may be basically calculated using reference weights in which weights of shapes, speeds, and pressures are set to 30, 30, and 40, respectively. The weight applied to the matching degree calculation may be a relative ratio such as 3: 3: 4. The sum of the weights applied to the matching degree calculation may be 100. In addition, even when the weight for each feature is changed by the authentication controller 170, the sum of the weights may be equal to 100.

Consider a case where a user registers a signature in a state where the registration apparatus 100 is fixed to a flat place, and a case where the user authenticates the signature by standing with the authentication apparatus 150 in a hand. If the device state at the time of registration is a fixed state but the device state at the time of authentication is a holding state, there is a high possibility that it is changed by the difference between the pressure detected at the time of signature registration and the pressure detected at the time of authentication. True Accept Rate (TAR) may be lowered. When the signature is registered in the fixed state and the signature is authenticated in the gripped state, if the reference weight is used due to the difference between the pressure detected at the signature registration and the pressure detected at the signature authentication, the TAR may be lowered. The authentication controller 170 may improve the identity authentication success rate by changing the weight of each feature (eg, 30, 30, 40) to 35, 35, and 30, respectively, to calculate the degree of conformity. It is common knowledge in the art that the weight of each signature feature is one embodiment, and that the weight of each signature feature may change in response to the state of the device 150 (eg, a fixed or gripping state). It will be easily understood by those who have.

The authentication control unit 170, based on a result of comparing the information on the state of the signature authentication device 150 at the time of signature input with the information on the state of the device at the time of signature registration, the authentication success threshold value used for authentication of the input signature. The authentication rate can be increased by changing the method. The authentication success threshold is a reference value for determining whether authentication is successful when the registered signature and the signature input for authentication are similar. For example, if the authentication success threshold is set to 80, and both the device state at the time of registration and the device state at the time of authentication are fixed, the user's own authentication success rate, that is, TAR, is 97%.

On the other hand, when the device state is fixed during registration, but the device state is gripped during authentication, the user's authentication success rate is lowered because the user's signature input is less accurate. On the contrary, even if the device state was registered when the signature was registered and the device state was fixed at the time of authentication, the authentication success rate of the user himself would be reduced. Accordingly, when the device state at the time of registration and the device state at the time of authentication are different, the authentication success rate of the user can be increased by reducing the authentication success threshold. For example, the authentication success threshold when the device state at the time of registration and the device state at the time of authentication are different may be reduced from 80 to 70. In addition, the authentication success threshold when the device state at the time of registration and the device state at the time of authentication may be reduced from 90 to 70.

Even when both the state of the signature authentication device 150 at the time of signature input for authentication and the state of the device at the time of signature registration are held, the accuracy of the user's signature input may be lowered and thus the success rate of the user's own authentication may be lowered. In addition, by lowering the authentication success threshold used for authentication of the signature, the authentication success rate of the user can be increased. For example, when the device state at registration and the device state at authentication are gripped, the authentication success threshold may be reduced from 80 to 65.

The authentication success threshold is one embodiment, and it is easy for a person with ordinary skill in the art that the authentication success threshold may be changed in correspondence with the function or performance of the device 150 in the fixed state and the gripped state. Will be understood.

2 is a flowchart illustrating a signature registration method associated with an embodiment of the present invention.

First, a signature for registration is input from the user (S210). While the signature is input, the state of the signature registration device 100 according to the information on the signature input posture of the user or the posture of the user is determined (S220). As described above, the state of the signature registration device 100 may be determined according to the detected tilt and / or the detected movement degree of the device 100 when the signature is input. While storing the information on the input signature in the storage unit 140, the information on the state of the signature registration device 100 is also stored (S230). The information about the signature may include information about characteristics such as signature shape, speed of signature input, pressure sensed, and the like. The information on the state of the signature registration device 100 may include information on the direction and / or acceleration of the device 100 or may include information indicating a fixed state or a gripping state determined using this information.

3A and 3B are diagrams for describing states of a signature registration device and / or a signature authentication device according to an embodiment of the present invention.

Referring to FIG. 3A, a user inputs a signature in a posture of placing the device 320 on a desk. When determining the state of the device 320 using the pitch information, the pitch of the device 320 will be close to zero degrees and thus the state of the device 320 will be determined to be a fixed state. When determining the state of the device 320 using the acceleration information, the sensor value input from the speed sensor of the device 320 will be the same fixed value and thus the state of the device 320 will be determined to be a fixed state. When determining the state of the device 320 by using the acceleration information, the amount of change in the acceleration value corresponding to the device 320 is within a predetermined range (for example, -1 ≤ x-axis ≤ 1 ㎨, -1 ≤ y-axis). ≤ 1 kHz, -1 ≤ z-axis ≤ 1 kHz) and thus the state of the device 320 may be determined to be fixed.

The acceleration sensor may output a constant value to the controller. When a change in acceleration occurs in the device 320, the controller may determine the state of the device 320 based on the change in acceleration. In addition, the state of the device 320 may be determined to be a fixed state or a gripped state by using both information about the pitch and acceleration of the device 320.

It will be readily understood by those skilled in the art that the predetermined range may vary depending on the performance of the acceleration sensor and the performance of the device.

Referring to FIG. 3B, the user is entering a signature while holding the device 320 in the hand 310. When determining the state of the device 320 using the pitch information, the pitch of the device 320 will represent an angle 330 of about 30 to 45 degrees rather than horizontal and thus the state of the device 320 will be held. Will be judged. When determining the state of the device 320 using the acceleration information, the sensor value input from the speed sensor due to the movement of the device 320 may be a value that is frequently changed, and accordingly, the state of the device 320 is determined to be a gripping state. Will be. In addition, the state of the device 320 may be determined to be a fixed state or a gripped state by using both information about the pitch and acceleration of the device 320.

4 is a flowchart illustrating a signature authentication method associated with an embodiment of the present invention.

A user who wants to use the device 150 enters a signature to unlock the signature authentication device 150 that is in a locked state (S410). While the signature is input, the state of the signature authentication device 150 is determined (S420). The state of the device 150 may be determined according to the detected tilt of the device 150 and / or the detected degree of movement when the signature is input. The information about the state of the device 150 may include information about the direction or acceleration of the device 150, or may include information indicating a fixed or gripping state determined using this information. The signature information input at the time of authentication is compared with the signature registered by the user, and the success or failure of the authentication is determined according to the comparison result (S430).

In authenticating the input signature, the information on the device status at the time of signature registration and the information on the status determined in step S420 are referred to. For example, when both the device state at the time of registration and the device state at the time of authentication are fixed, authentication is processed by the authentication routine set to a basic value without changing the weight for each feature or the authentication success threshold. If the device state at the time of registration and the device state at the time of authentication are both held, it is difficult to guarantee the stability of the input data by the shaking of the devices 100 and 150, so that the authentication success rate can be improved by lowering the authentication success threshold. Can be. If the device state at the time of registration and the device state at the time of authentication are different, the data such as the pressure input at the time of signature registration and the signature authentication are different, so that the weight for each feature for calculating the degree of conformity between signatures can be changed. Alternatively, or with a weight change, the authentication success threshold may be changed. This is because, if the user's posture at registration is different from the user's posture at registration, the degree of registration tends to decrease.

FIG. 5 is a flowchart illustrating an embodiment of the present invention and an associated signature registration and authentication method, and illustrates a method of registering a signature in one device and performing signature authentication for access to the device.

When the user inputs a signature (S510), information about the input signature is generated (S512). The information on the signature may include information such as the shape of the signature composed of touch coordinates, the signature input speed calculated by the time at which each touch coordinate is received, and the pressure at the touch. While the signature is input, information on the posture of the user, that is, the state of the device is generated (S514). The posture of the user may be classified into a fixed state or a gripped state. It is determined whether a signature registration procedure or a signature verification procedure is currently performed (S516). In the case of the signature registration procedure, the signature is stored in the storage 140 and information about the signature and the posture of the user are registered (S518).

In the case of the signature authentication procedure, information on the user's posture (for example, the state of the device) at the time of registration and the registered signature are read from the storage 140 (S520). When calculating the degree of registration between the registration signature and the authentication signature, the weight for each feature of the signature is changed by referring to the user attitude information in the signature authentication procedure and the user attitude information in the signature registration procedure (S522). In addition, the authentication success threshold value is calculated by referring to the user attitude information in the signature authentication procedure and the user attitude information in the signature registration procedure (S524). The success or failure of authentication by signature is determined by using the calculated consistency and the authentication success threshold value (S526).

6 is a view for explaining an operation between a device and a wearable device according to another embodiment of the present invention.

Referring to FIG. 6, a wearable device 1100 and a signature registration device 1000 may be wirelessly connected to each other. Wearable device 1100 includes an accessory type, including a watch, glasses, ring, bracelet, necklace, or hand-held bar type, a textile / clothing type, skin, including a textile product or clothing integrated computer. Alternatively, the method may include a body attachment type including a skin patch sensor attachable to a body or a living body implant type including a biotransplant sensor implantable in a human body (a living body).

The wearable device 1100 may wirelessly transmit the sensing information detected through the sensor to the device (signature registration device or signature authentication device 1000) at the request or periodic interval of the device (signature registration device or signature authentication device 1000). have.

In an embodiment of the present invention, the wearable device 1100 may be attached (or worn) to one of contact or non-contact with a user, and may detect a user's state under a control of a controller (eg, a tilt sensor, a motion sensor, Gyro sensor, temperature sensor, etc.) and a communication unit capable of transmitting a user's status.

The user wears the wearable device 1100 on a wrist or head and inputs a signature into the device 1000 using an input tool such as a finger or a stylus pen 1001 including an index finger.

7 is a block diagram illustrating a device and a wearable device according to another embodiment of the present invention.

Referring to FIG. 7, the apparatus 1000 may include an input unit 1010, a controller 1020, a detector 1030, a storage 1040, and a communication unit 1050. The controller 1020 may control the input unit 1010, the detection unit 1030, the storage unit 1040, and the communication unit 1050.

The controller 1020 controls the overall operation of the apparatus 1000 and the signal flow between the internal components 1010 to 1050 of the apparatus 1000 and performs data processing. If there is a user input or satisfies a preset and stored condition, the controller 1020 may execute an operating system (OS) and various applications stored in the storage 1040.

Components 1010 to 1040 except for the communication unit 1050 are substantially the same as one embodiment of the present invention (FIGS. 1A and 1B), and thus redundant descriptions are omitted.

The communication unit 1050 may connect the device 1000 with the wearable device 1100 under the control of the controller 1020. The controller 1020 may receive status information of the user from the wearable device 1100 connected through the communication unit 1050. In addition, the communication unit 1050 may be connected to an external server (not shown) under the control of the controller 1020 to download an application or to transmit / receive data for web browsing. The communication unit 1050 may include one of a wireless LAN (not shown) and a local area communication unit (not shown) in response to the performance and structure of the apparatus 1000. In addition, the communication unit 1050 may include a combination of a wireless LAN (not shown) and a local area communication unit (not shown) corresponding to the performance and structure of the apparatus 1000.

The wireless LAN (not shown) may be connected to an access point (AP) using wireless at a place where an access point (AP) (not shown) is installed under the control of the controller 1020. Wireless LAN (not shown) supports the Wireless LAN Standard (IEEE802.11x) of the Institute of Electrical and Electronics Engineers (IEEE). The near field communication unit (not shown) includes Bluetooth, Bluetooth low energy (IR), infrared data association (IrDA), Wi-Fi (Ui-Fi), Ultra Wideband (UWB), and Near Field Communication (NFC). ) May be included.

Components (eg, 1010 to 1050) illustrated in the apparatus 1000 of FIG. 7 may include at least one component added or removed corresponding to the performance of the apparatus 1000. In addition, it will be readily understood by one of ordinary skill in the art that the location of the components (eg, 1010-1050) can be changed corresponding to the performance or structure of the device 1000.

The wearable device 1100 may include a control unit 1110, a communication unit 1130, a camera unit 1140, a detection unit 1150, a display unit 1170, a speaker 1175, a storage unit 1180, and / or a power unit ( 1190). For example, the wearable device 1100 may include a controller 1110, a communicator 1130, a detector 1150, a storage 1180, and a power supply 1190. The wearable device 1100 may include a controller 1110, a communication unit 1130, a camera unit 1140, a detector 1150, a storage unit 1180, and a power supply unit 1190. The wearable device 1100 may include a control unit 1110, a communication unit 1130, a camera unit 1140, a detection unit 1150, a display unit 1170, a storage unit 1180, and / or a power supply unit 1190. have. The wearable device 1100 may include a control unit 1110, a communication unit 1130, a camera unit 1140, a detection unit 1150, a display unit 1170, a speaker 1175, a storage unit 1180, and a power supply unit 1190. ) May be included.

The controller 1110 stores a signal or data input from the outside of the ROM 1112 and the wearable device 1100 in which a processor 1111, a control program for controlling the wearable device 1100 is stored, or is wearable The device 1100 may include a RAM 1113 used as a storage area corresponding to various operations performed by the device 1100. In addition, the controller 1110 may include a processor 1111 and a flash memory (not shown). It will be readily understood by those skilled in the art that the configuration of the controller 1110 may be variously implemented according to an embodiment of the present invention.

The controller 1110 controls the overall operation of the wearable device 1100 and the signal flow between the internal components 120 to 190 of the wearable device 1100 and performs data processing. The controller 1110 controls the power supplied from the power supply unit 1190 to the internal components 1130 to 1180. In addition, when there is a user input or satisfies a preset and stored condition, the controller 1110 may execute an operating system (OS) and various applications stored in the storage 1180.

The processor 1111 may include a graphic processing unit (not shown) for graphic processing of an image or an image. The processor 1111 may be implemented in the form of a system on chip (SoC) including a core (not shown) and a GPU (not shown). The processor 1111 may include a single core, dual cores, triple cores, quad cores, and multiple cores thereof.

The processor 1111 may be implemented with a plurality of processors including a main processor (not shown) and a sub processor (not shown). The subprocessor refers to a processor operating in a sleep mode. In addition, the processor 1111, the ROM 1112, and the RAM 1113 may be interconnected through an internal bus.

In an embodiment of the present invention, the controller 1110 of the wearable device may be used as a term referring to a component including the processor 1111, the ROM 1112, and the RAM 1113.

It will be readily understood by those skilled in the art that the operation of the controller 1110 may be variously implemented according to an embodiment of the present invention.

The communication unit 1130 may wirelessly connect the wearable device 1100 with the device 1000 under the control of the controller 1110. The controller 1110 may download an application or perform web browsing from an external device (for example, a server) connected through the communication unit 1130. The communication unit 1130 may include one of a wireless LAN (not shown) and a local area communication unit (not shown) in response to the performance and structure of the wearable device 1100. In addition, the communication unit 1130 may include a combination of a wireless LAN (not shown) and a local area communication unit (not shown).

The wireless LAN (not shown) may be connected to an access point (AP) using wireless at a place where an access point (AP) (not shown) is installed under the control of the controller 1110. The near field communication unit (not shown) may include Bluetooth, Bluetooth low energy (IrDA), infrared data association (IrDA), Wi-Fi (Ui-Fi), Ultra Wideband (UWB) and / or NFC (Near). Field communication).

The communication unit 1130 may transmit the state information of the user corresponding to the sensing information detected by the sensing unit 1150 to the apparatus 1000 in the form of data under the control of the controller 1110.

The camera unit 1140 captures a still image or a video in a direction desired by a user under the control of the controller 1110. In addition, the camera unit 1140 may capture a still image or a video corresponding to a request direction of the user under the control of the controller 1110. The camera unit 1140 may convert the received image under the control of the controller 1110 and output the converted image to the controller 1110.

The camera unit 1140 may include a lens (not shown) and an image sensor (not shown). The camera unit 1140 may support optical zoom (eg, 5 times optical zoom) or digital zoom (eg, 10 times digital zoom) using a plurality of lenses and image processing. . The recognition range of the camera unit 1140 may be variously set according to an angle between the camera and the user and environmental conditions.

When the camera unit 1140 includes a plurality of cameras, the first camera (not shown) adjacent to the bezel is adjacent (for example, a distance between the first camera is greater than 2 cm and smaller than 8 cm). A second camera (not shown) may be used to receive a 3D still image or 3D motion.

The camera unit 1140 may be integrally implemented with the wearable device 1100 or may be implemented separately. An apparatus (not shown) including the separated camera unit 1140 may be wired / wirelessly connected to the wearable device 1100 through the communication unit 1130 or an input / output unit (not shown).

The controller 1110 may be shaken by a user (for example, worn on a wrist) or a shake (for example, a user) wearing the wearable device 1100 using a still image or a video received from the camera unit 1140. Worn on the head). In addition, the controller 1110 may transmit the received still image or video to the outside using the communication unit 1130.

The detector 1150 may detect a state of a user while a signature is input (for example, signature registration or signature authentication) under the control of the controller 1110. The state of the user is related to a condition or situation affecting the signature input of the user who inputs the signature. For example, the degree of shaking of the user who is wearing the wearable device 1100, the degree of shaking of the user, and the user's hand Location, operating state of the user or blood alcohol concentration of the user, and the like.

The detector 1150 may detect not only the user's state but also state information (for example, a fixed state or a gripped state) of the device 1000 that receives the signature. For example, in the case of the wearable device 1100 worn on a user's wrist, the controller 1110 uses the sensing information detected by the sensor 1150 to detect the state of the user and the state of the device 1000. For example, similar to the sensing in the sensing unit 130) may be determined.

The detector 1150 may include a proximity sensor, an acceleration sensor, a gyro sensor, a terrestrial magnetism sensor, an alcohol sensor, and a current skin resistance sensor. skin response sensor (GSR) and / or pressure sensor. For example, the controller 1110 may detect user hand shake or user shake using an acceleration sensor, a gyro sensor, and / or a geomagnetic sensor. The controller 1110 may detect the user blood alcohol concentration by using the blood alcohol concentration sensor (or the proximity sensor). For example, the blood alcohol concentration sensor may be a bar type that is electrically connected to the device 1100. The controller 1110 may detect a user's motion (eg, moving, stopping, running, etc.) and / or a state by using an acceleration sensor, a gyro sensor, and / or a geomagnetic sensor. The controller 1110 may detect a state (eg, tilt, direction, etc.) of the wearable device 1100 using an acceleration sensor, a gyro sensor, and / or a geomagnetic sensor. The controller 1110 may detect a position of a user's hand using an acceleration sensor and / or a gyro sensor. In addition, the controller 1110 may detect the user's exercise intensity, bedtime, movement or walking by using the acceleration sensor, the current skin resistance sensor and / or the pressure sensor. The controller 1110 may detect a user's state using a combination of various sensors included in the detector 1150.

The sensing unit 1150 may be integrated with or separate from the wearable device 1100. The detachable detector 1150 may be connected to the wearable device 1100 by wire or wirelessly to transmit an electrical signal corresponding to the user state detection requested from the wearable device 1100 to the wearable device 1100.

The display 1170 may display content (for example, a video, an image, text, or a web page) received through the communication unit 1130 under the control of the controller 1110. In addition, the display 1170 may output content stored in the storage 1180 under the control of the controller 1110. The display 1170 may display the detected state of the wearable device 1100 under a control of the controller 1110 as a symbol including an animation, an image, text, and / or an emoticon.

The display unit 1170 may be implemented as a touch screen (not shown) including a touch panel (not shown) for receiving a user input (for example, single touch or multi touch, etc.).

The speaker 1175 may output audio (eg, voice, sound) or audio included in a video received through the communication unit 1130 under the control of the controller 1110. In addition, the speaker 1175 may output audio stored in the storage 1180 under the control of the controller 1110.

The storage unit 1180 may include a control program for controlling the internal components of the wearable device 1100 and the control unit 1110, an application initially provided from a manufacturer or downloaded from the outside, a graphical user interface (GUI) related to the application, and a GUI. Objects to provide (eg, images, text, icons, buttons, etc.), user information, documents, databases, or related data may be stored.

The storage unit 1180 may store an operating system (OS), various data, programs, or applications for driving and controlling the wearable device 1100. In an exemplary embodiment of the present invention, the term “storage unit” refers to a memory card (eg, a micro SD card, a USB memory, or an illustration) mounted in the storage unit 1180, the ROM 1112, the RAM 1113, or the wearable device 1100. Not). In addition, the storage unit 1180 may include a nonvolatile memory, a volatile memory, a hard disk drive (HDD), or a solid state drive (SSD).

The storage unit 1180 may include a communication module, a camera module, a sensing module, a display module, a touch panel module, an audio output module, a storage module, a power module, or an associated database (not shown). Modules and databases not shown in the storage unit 1180 may include a communication control function, a camera control function, a display control function, a touch panel control function, an audio output control function, a storage control function, and a power control function in the wearable device 1100. Alternatively, it may be implemented in software form to perform a related database (DB) control function. The controller 1110 may control the wearable device 1100 using respective modules and software stored in the storage 1180.

The power supply unit 1190 supplies power input from an external power source to the components 1130 to 1180 inside the wearable device 1100 under the control of the controller 1110. In addition, the power supply unit 1190 may supply power to one or more batteries (not shown) located in the wearable device 1100 under the control of the controller 1110. The powered battery may be located between the display unit 1170 and an integrated or detachable rear cover (not shown).

Components (eg, 1110 to 1180) illustrated in the wearable device 1100 of FIGS. 6 and 7 may include at least one component added or removed corresponding to the performance of the wearable device 1100. In addition, it will be readily understood by those skilled in the art that the location of the components (eg, 1110 to 1180) may be changed corresponding to the performance or structure of the wearable device 1100.

8 is a flowchart illustrating a device signature registration and authentication method according to another embodiment of the present invention.

10 to 14 are diagrams for explaining an example of a device signature registration and authentication method according to another embodiment of the present invention.

In step S1201 of Fig. 8, the user's signature is input.

Referring to FIG. 10, a signature of a user is input through the input unit 1010 of the apparatus 1000. A user who wears the wearable device 1100 on the wrist and holds the device 1000 inputs a signature using a finger including an index finger or an input tool such as a stylus pen 1001. Alternatively, the user who wears the wearable device 1100 on his head and holds the device 1000 inputs a signature using a finger including an index finger or an input tool such as a stylus pen 1001. To improve the accuracy of signature registration, the user can enter a signature multiple times.

The signature of the user may be input through configuration of the device 1000 or through an application executed for registration of the signature.

The storage unit 1040 of the apparatus 1000 may store the received user signature under the control of the controller 1010. In addition, the storage unit 1040 of the apparatus 1000 may determine the characteristics of the received user signature (eg, the shape of the signature, the speed of the signature input, and / or the pressure at the detected input) under the control of the controller 1010. Can be saved.

Referring to FIG. 11, a screen or a web page (not shown) of an application 1410 executed in the apparatus 1000 may be displayed. The application 1410 may be a shopping application and may be downloaded from the outside. The screen of the displayed application 1410 may be an order form of a product (for example, a sound bar) to be purchased.

When the signature input field 1411 is touched by the input pen 1001 on the screen of the application 1410, the controller 1010 may display a popup 1412 for signature input. The displayed popup 1412 may have a larger area than the signature input field 1411.

The user may input the authentication signature using the input pen 1001 in the enlarged popup 1412. When the input of the authentication signature is completed, the popup 1412 may disappear and the inputted authentication signature may be displayed in the signature input field 1411.

Referring to FIG. 6, the user may touch the screen of the device 1000 with the input pen 1001 to release the screen lock state of the device 1000. In response to the touch of the input pen 1001, the controller 1010 may display a pop-up. A user may input a signature using the input pen 1001 to unlock the screen of the device 1000.

In operation S1202 of FIG. 8, the device requests sensing information from the wearable device.

The controller 1010 of the device 1000 may search for a wearable device capable of detecting a user state through a communication unit 1050 with a known wireless network (eg, Bluetooth, WLAN, or local area communication). In addition, the controller 1010 of the device 1000 may use a known wireless network (for example, Bluetooth, WLAN, or short-range communication, etc.) using a wearable device capable of detecting a user state and a previous connection history through the communication unit 1050. Can be reconnected.

When a user's signature is input, the controller 1010 may search for the wearable device 1100. When one of the signature input field 1411 and the signature input popup 1412 is displayed on the screen of the device 1000, the controller 1010 may search for the wearable device 1100. In addition, when the input of the user signature is completed, the controller 1010 may search for the wearable device 1100.

The controller 1010 may wirelessly connect to the found wearable device (eg, a wrist worn wearable device). The controller 1010 of the device 1000 requests sensing information corresponding to a user's state from the wirelessly connected wearable device 1100.

In response to a request of the device 1000, the controller 1110 of the wearable device 1100 may detect a user state using the detector 1150. The controller 1110 of the wearable device 1100 uses an application (not shown), a software program or a program included in an OS to detect a user state in response to a request of the device 1000, and the sensor 1150. The user's status can be detected. In addition, the controller 1110 of the wearable device 1100 may detect a state of the user using the detector 1150 in an application (not shown) that is running in response to a request of the device 1000.

For example, in the hand shake state, which is one of various user states, the low hand shake state may detect a range of acceleration detected from the detector 1150 at -1.5 = x-axis = 1.5 =, -1.5 = y-axis = 1.5 ㎨, -1.5 = z axis = 1.5 mW) The range of sensed accelerations can also be determined by the vector sum of the X, Y and Z axes. In addition, the high shaking state may set the range of acceleration detected from the sensing unit 1150 within -12.5 = x-axis = 12.5 Hz, -12.5 = y-axis = 12.5 Hz, -12.5 = z-axis = 12.5 Hz. . The range of sensed accelerations can also be determined by the vector sum of the X, Y and Z axes.

The state of the hand shaking according to the embodiment of the present invention is one embodiment, and the range or size of each sensor detection value detected by various sensors of the sensing unit 1150 may be changed according to various user states. It will be readily understood by one of ordinary skill in the art.

The controller 1110 of the wearable device 1100 uses an application (not shown), a software program or a program included in an OS, and a detection unit 1150 that detect a user state in advance before requesting the device 1000. The user's status can be detected periodically (for example, 1 min, changeable).

The detector 1150 may generate an electrical signal corresponding to a state of a user wearing the wearable device 1100, and transmit the generated electrical signal to the controller 1110. For example, the acceleration sensor may transmit an electrical signal corresponding to the detection of a speed change per unit time to the controller 1110 in the X, Y, and Z axis directions of the wearable device 1100. The gyro sensor may transmit an electrical signal corresponding to the detection of the angle of rotation of the wearable device 1100 per unit time to the controller 1110. The geomagnetic sensor may transmit an electrical signal corresponding to detection (eg, azimuth) of the surrounding geomagnetism of the wearable device 1100 to the controller 1110. The blood alcohol concentration sensor may transmit an electrical signal corresponding to the detection of the alcohol concentration included in the exhalation of the user to the controller 1110. The current skin resistance sensor GSR may transmit an electrical signal corresponding to the detection of the electrical conductivity (for example, the degree of activation of the sympathetic nerve) of the user's skin to the controller 1110. The pressure sensor may transmit an electrical signal corresponding to the detection of the input signature pressure to the controller 1110. The proximity sensor may transmit an electrical signal corresponding to the detection of a user's approach to the wearable device 1100 to the controller 1110.

The controller 1110 may determine a user's state (eg, hand shake, user shake, user's motion, blood alcohol concentration, etc.) using the electrical signal received from the detector 1150. The controller 1110 corresponds to an electrical signal received from the detector 1150 and a user state reference stored in the storage 1110, for example, an acceleration signal, a gyro sensor, and / or an electrical signal detected by a geomagnetic sensor. Based on the user status, which is not shown). It will be readily understood by those skilled in the art that the user state criteria may be changed according to the type and function of the sensor included in the wearable device 1100.

The controller 1110 may store the electrical signal received from the detector 1150 in the storage 1180. The controller 1110 may store an electrical signal received from one or more sensors in the storage 1180. Also, the controller 1110 may store user state information corresponding to the user state in the storage 1180. For example, the user status information may include detection sensor name, detection sensor identifier (ID), detection time, sensor detection value (e.g. voltage, current, etc.), user status (e.g., shaking, shaking, walking, Jogging, etc.).

In one embodiment of the present invention, the sensing information may mean a user state information or an electrical signal received from a sensor.

The controller 1110 of the wearable device 1100 may transmit sensing information corresponding to a request of the device 1000 to the device 1000 using the communication unit 1130. The control unit 1110 of the wearable device 1100 uses the communication unit 1130 to detect sensing information corresponding to a request of the device 1000 in real time or delayed (for example, 5 sec or less until transmission after detection). ) Can be sent.

In operation S1203 of FIG. 8, the device receives sensing information from the wearable device.

The controller 1010 of the device 1000 may receive sensing information corresponding to the request of the device 1000 from the wearable device 1100 using the communication unit 1050. The sensing information may include one of user state information and an electrical signal. The controller 1010 may temporarily store the received sensing information in the storage 1080. The sensing information received includes the sensor name, sensor ID (ID), detection time, sensor detection value (e.g. voltage, current, etc.), user status (e.g., shaking, shaking, walking, jogging, etc.). It may include a code corresponding to.

In step S1204 of FIG. 8, the device determines a user state.

The controller 1010 of the apparatus 1000 may determine (eg, walk) the user's state by using the user state information included in the received sensing information. Alternatively, the controller 1010 of the apparatus 1000 may determine (eg, walk) a user's state by using an electric signal included in the received sensing information. In addition, the controller 1010 of the apparatus 1000 may determine whether to register the signature information using the input user signature information (for example, the shape of the signature, the speed of the signature input, or the detected signature pressure).

In step S1205 of FIG. 8, the device determines whether or not to register a signature.

The controller 1010 of the apparatus 1000 may determine whether to store the storage 1040 by using the input user signature information. For example, when the storage unit 1040 does not have the same user signature information (eg, when registering the user signature for the first time), the controller 1010 of the apparatus 1000 may determine registration of the user signature information. . In addition, when one of the signature registration procedure and the signature authentication procedure is selected by the user, the controller 1010 of the apparatus 1000 may perform the selected procedure. When a signature registration procedure is selected by the user, the controller 1010 of the apparatus 1000 may perform a signature registration procedure. In this case, the flow advances to step S1206 of FIG.

If the storage unit 1040 has the same user signature information, the controller 1010 of the apparatus 1000 may determine authentication of the user signature information. In addition, when the signature authentication procedure is selected by the user, the controller 1010 of the apparatus 1000 may perform the signature authentication procedure. In this case, the flow advances to step S1207 of FIG.

In addition, the controller 1010 of the apparatus 1000 determines whether the signature registration procedure is currently being performed or the signature verification procedure, and proceeds to step S1206 of FIG. 8 in the case of the signature registration procedure, and in the case of the signature authentication procedure. The process may proceed to step S1207 of FIG. 8.

In step S1206 of FIG. 8, the device stores signature information and user state information.

The controller 1010 of the apparatus 1000 may store the received user signature information and the user state information in the storage 1040 according to the signature registration procedure. In addition, the controller 1010 of the apparatus 1000 may store, in the storage 1040, user signature information and user state information received and temporarily stored from the wearable device 1100 according to a signature registration procedure.

When the user signature information and the user status information are stored in the storage unit 1040, the signature registration method of the device is terminated.

Returning to step S1205 of FIG. 8, if there is the same user signature information in the storage unit 1040, the flow proceeds to step S1207 of FIG. 8 to perform a signature verification procedure.

In step S1207 of FIG. 8, the device determines whether the signature is authenticated using the stored signature information and the user status information, the input signature information, and the received user status information.

The controller 1010 of the apparatus 1000 may authenticate the input user signature by using the signature information and the user status information stored in the storage 1040, the input signature information, and the received user status information. The controller 1010 calculates a degree of matching using the pre-registered signature information and the input signature information. The controller 1010 may determine whether the input user signature is authenticated by comparing the calculated match result with an authentication success threshold. The calculation of the degree of conformity and whether the signature is authenticated may use stored signature information and user state information, input signature information, and received user state information.

The controller 1010 of the apparatus 1000 may change the weight for each feature corresponding to the matching degree calculation using the registered (prestored) user state information and the input user state information. In addition, the controller 1010 of the apparatus 1000 may change the authentication success threshold value using the registered (prestored) user state information and the input user state information.

When the user state (for example, low hand shake) when signing registration and the user state (for example, low hand shake) when signing authentication are the same (the input accuracy of registered user signature and authentication user signature is high) The controller 1010 of the apparatus 1000 may perform the signature authentication procedure without changing the weight for each feature and changing the authentication success threshold.

In response to the comparison result of the user state in the case of signature registration and the user state in the case of signature authentication, the controller 1010 uses a feature (eg, signature shape, signature) to calculate the degree of conformity between the registered user signature and the authentication user signature. The weight of each input speed or the pressure of the input signature may be changed. Each signature feature has a weight corresponding to its importance in calculating the degree of matching. For example, when calculating the matching degree, the controller 1010 may calculate the matching degree by setting the weight of the signature shape to 30, the weight of the signature speed to 30, and the weight of the input signature pressure to 40. The sum of the weights applied to the matching degree calculation may be 100. In addition, even when the weight for each feature is changed by the controller 1010, the sum of the weights may be equal to 100.

Consider a case where a user registers a signature through the device 1000 in a low shaking state and a case where an authentication signature is input through the device 1000 in a high shaking state. When the control unit 1010 applies the reference weight (for example, 30, 30, 40), the true acceptance rate (TAR) may be lowered due to the difference between the characteristics of the registration signature and the signature of the authentication signature. . The controller 1010 may improve the identity authentication success rate (TAR) by changing the reference weight (eg, 30, 30, 40) of the signature feature to 40, 35, and 25, respectively, to calculate the degree of conformity.

The weight of each signature feature according to an embodiment of the present invention is one embodiment, and the weight of each signature feature in response to a user's state (eg, hand shaking, user shake, user's motion, walking or jogging, etc.). It will be readily understood by one of ordinary skill in the art that?

In response to the comparison result between the user state in case of signature registration and the user state in case of signature authentication, the controller 1010 changes the authentication success threshold value for authentication of the input signature to increase the identity authentication rate. Can be. The authentication success threshold is a reference value determined as authentication success in consideration of the degree of similarity between the registered signature and the signature input for authentication.

For example, if the set authentication success threshold is 85 and the user state of low hand shake when signing registration and the user state of low hand shake when signing authentication (for example, low hand shake), The identity verification success rate (TAR) may be 96%.

In the case of signature registration, in the user state of low hand shake and the signature of high hand shake in case of signature authentication, the user authentication success rate may decrease due to the difference in the accuracy of the input user signature. In addition, in a user registration state of high hand shake in case of signature registration and a user state of low hand shake in case of signature authentication, the user authentication success rate may decrease due to the difference in the accuracy of the input user signature.

When the user state in case of signature registration and the user state in case of signature authentication are different, the controller 1010 may improve the identity authentication success rate by changing (eg, decreasing) the authentication success threshold value. For example, when the user state when signing registration and the user state when signing authentication are different, the controller 1010 may change the authentication success threshold value from 85 to 70. In addition, when the user state when signing registration and the user state when signing authentication are different, the controller 1010 may change the authentication success threshold value from 90 to 75.

In the case of signature registration, in a user state of high hand shake and signature of user's state of high hand shake in case of signature authentication, the user authentication success rate may be lowered by the difference in the accuracy of the input user signature. When the user state in the case of signature registration and signature authentication is both a high hand shake state, the controller 1010 may improve the authentication success rate by changing (eg, reducing) the authentication success threshold. For example, when both the signature registration and the signature authentication are in a state of high hand shaking, the controller 1010 may change the authentication success threshold value from 80 to 70.

The authentication success threshold according to the embodiment of the present invention is one embodiment, and the authentication success threshold may be changed in response to the user's state (for example, hand shaking, walking, drinking, jogging, etc.). It will be readily understood by one of ordinary skill in the art.

In step S1208 of Fig. 8, the device determines whether or not to verify the signature.

The controller 1010 of the apparatus 1000 may determine whether to verify the signature in response to a result of comparing the stored signature information and the user state information with the input signature information and the received user state information.

12 and 11, the controller 1010 of the apparatus 1000 may display a popup according to whether the signature is verified. When the input signature is authenticated, the controller 1010 displays a popup 1413 corresponding to the authentication success. Alternatively, when the input signature is authenticated, the controller 1010 may display a popup 1413 including authentication success and comments. When the popup 1413 is selected or closed by the user, the process proceeds to step S1209 of FIG. 8.

If the input signature fails authentication, the controller 1010 displays a popup 1414 corresponding to the authentication failure. Alternatively, when the input signature fails to be authenticated, the controller 1010 may display a popup 1414 including retry 1414a and retry 1414b and cancel as well as authentication failure. When the popup 1414 is selected or closed by the user, the signature authentication method of the device ends.

In operation S1209 of FIG. 8, the apparatus performs a function.

The controller 1010 of the apparatus 1000 may perform a function corresponding to the signature authentication. For example, when the signature is verified, the controller 1010 may purchase a product through the shopping application 1410. In addition, the controller 1010 may release the screen lock of the apparatus 1000 by the authentication signature.

When the device 1000 performs the corresponding function, the signature authentication method of the device ends.

9 is a flowchart illustrating a device signature registration and authentication method according to another embodiment of the present invention.

In step S1301 of FIG. 9, the signature of the user is input.

Referring to FIG. 10, a signature of a user is input through the input unit 1010 of the apparatus 1000. The user wears the wearable device 1100 on the wrist or the head, and the user holding the device 1000 inputs a signature using an input pen 1001 such as a finger or a stylus pen including an index finger.

Since the input of the user signature in step S1301 of FIG. 9 is substantially similar to the input of the user signature in step S1201 of FIG. 8, redundant description is omitted.

In step S1302 of FIG. 9, state information of the device is received.

When the user's signature is input, the controller 1010 of the device 1000 may detect the direction and / or the movement of the device by using the detector 1030. The detected direction and / or movement of the device may be transmitted to the controller 1010.

Receiving the state information of the device 1000 in step S1302 of FIG. 9 is the state of the device 1000 in step S220 of FIG. 2, step S420 of FIG. 4, or step S514 of FIG. 5. Since it is substantially similar to the reception of the information, redundant description is omitted.

In operation S1303 of FIG. 9, the device requests sensing information from the wearable device.

The controller 1010 of the device 1000 may search for a wearable device capable of detecting a user state through a communication unit 1050 with a known wireless network (eg, Bluetooth, WLAN, or local area communication). The controller 1010 may wirelessly connect to the found wearable device (eg, a wrist worn wearable device). The controller 1010 of the device 1000 requests sensing information corresponding to a user's state from the wirelessly connected wearable device 1100.

In response to a request of the device 1000, the controller 1110 of the wearable device 1100 may detect a user state using the detector 1150.

Since the request of the sensing information and the user information detection to the wearable device in step S1303 of FIG. 9 are substantially similar to the request of the sensing information and the user state detection to the wearable device in step S1202 of FIG. It is omitted.

In operation S1304 of FIG. 9, the device receives sensing information from the wearable device.

The controller 1010 of the device 1000 may receive sensing information corresponding to the request of the device 1000 from the wearable device 1100 using the communication unit 1050.

Since the reception of the sensing information from the wearable device in step S1304 of FIG. 9 is substantially similar to the reception of the sensing information from the wearable device in step S1203 of FIG. 8, a redundant description is omitted.

In step S1305 of FIG. 9, the device determines the device state and the user state.

The controller 1010 of the device 1000 may determine a state (eg, a fixed state or a gripped state) of the device 1000 by using the sensor value received by the detector 1030. The controller 1010 of the apparatus 1000 may determine the user's state (eg, walking) using the received sensing information.

Since the determination of the device state in step S1305 of FIG. 9 is substantially similar to the determination of the user state in step S220 of FIG. 2 or step S420 of FIG. 4, overlapping description is omitted. Since the determination of the user state in step S1305 of FIG. 9 is substantially similar to the determination of the user state in step S1204 of FIG. 8, overlapping description is omitted.

In step S1306 of FIG. 9, the device determines whether or not to register a signature.

The controller 1010 of the apparatus 1000 may determine whether to store the storage 1040 by using the input user signature information.

Determination of whether or not the signature registration procedure is performed in step S1306 of FIG. 9 is substantially similar to that of whether or not the signature registration procedure is performed in step S1205 of FIG. 8, and thus redundant description is omitted.

In step S1207 of FIG. 9, the device stores signature information, state information of the device, and user state information.

The controller 1010 of the apparatus 1000 may store the received user signature information, the state information of the apparatus, and the user state information in the storage 1040 according to the signature registration procedure. In addition, the controller 1010 of the apparatus 1000 may store the user signature information, the state information of the device, and the user state information, which are received and temporarily stored in the wearable device 1100 according to a signature registration procedure, in the storage 1040.

When the user signature information, the device status information, and the user status information are stored in the storage unit 1040, the signature registration method of the device is terminated.

Returning to step S1306 of FIG. 9, if there is the same user signature information in the storage unit 1040, the flow proceeds to step S1308 of FIG. 9 to perform a signature verification procedure.

In step S1308 of FIG. 9, the device determines whether the signature is authenticated using the stored signature information, the device status information and the user status information, the input signature information, the device status information, and the received user status information.

The controller 1010 of the apparatus 1000 may input a user by using signature information stored in the storage 1040, status information and user status information of the device, input signature information, status information of the device, and received user status information. The signature can be verified. The controller 1010 calculates a degree of matching using the pre-registered signature information and the input signature information. The controller 1010 may determine whether the input user signature is authenticated by comparing the calculated match result with an authentication success threshold. The calculation of the degree of registration and whether the signature is authenticated may use stored signature information, device status information and user status information, input signature information, device status information, and received user status information.

The controller 1010 of the apparatus 1000 may change the weight for each feature corresponding to the calculation of the degree of matching using the state information and the user state information of the registered (pre-stored) device and the input state information and the user state information. have. In addition, the controller 1010 of the device 1000 may change the authentication success threshold value by using the state information and user state information of the registered (pre-stored) device and the input device state information and user state information.

In the case of signature registration, the state of the device (e.g., fixed state) and the user state (e.g. low hand shake), and in the case of signature authentication, the state of the device (e.g., fixed state) and the user state ( For example, when the low hand shake is the same (when the input accuracy of the registered user signature and the authenticated user signature is high), the controller 1010 of the apparatus 1000 signs without changing the characteristic weight and changing the authentication success threshold. The authentication procedure can be performed.

In response to the comparison result of the user state in the case of signature registration and the user state in the case of signature authentication, the controller 1010 uses a feature (eg, signature shape, signature) to calculate the degree of conformity between the registered user signature and the authentication user signature. The weight of each input speed or the pressure of the input signature may be changed. Each signature feature has a weight corresponding to its importance in calculating the degree of matching. For example, when calculating the matching degree, the controller 1010 may calculate the matching degree by setting the weight of the signature shape to 30, the weight of the signature speed to 30, and the weight of the input signature pressure to 40. The sum of the weights applied to the matching degree calculation may be 100. In addition, when the weight for each feature is changed by the controller 1010, the sum of the weights may be equal to 100.

Consider a case where a user registers a signature through the device 1000 in a fixed state and a low shaking state, and a case where a user inputs an authentication signature through the device 1000 in a fixed state and a high shaking state. If the control unit 1010 is fixed and the reference weight (for example, 30, 30, 40) is applied to the apparatus 1000 in which there is a difference in hand shaking, the difference between the characteristics of the registration signature and the signature of the authentication signature True Accept Rate (TAR) may be lowered. The controller 1010 may improve the identity authentication success rate (TAR) by changing the reference weight (eg, 30, 30, 40) of the signature feature to 40, 35, and 25, respectively, to calculate the degree of conformity.

The weight of each signature feature in accordance with an embodiment of the present invention is one embodiment, the state of the device (eg, stationary, gripping) and the state of the user (eg, hand shaking, motion, walking or jogging). It will be readily understood by one of ordinary skill in the art that the weight of each signature feature can be changed in correspondence with the < RTI ID = 0.0 >

In response to a comparison result of the device state and user state when signing registration and the device state and user state when signing authentication, the controller 1010 changes the authentication success threshold value for the authentication of the input signature to change the identity rate. It can increase. The authentication success threshold is a reference value determined as authentication success in consideration of the degree of similarity between the registered signature and the signature input for authentication.

For example, the set authentication success threshold is 85, and the device 1000 which is fixed when signing registration and the user state of low hand shake and the device 1000 which is fixed when signing authentication and low hand shake are In the case of a user state (eg, low hand shaking), the user's identity verification success rate (TAR) may be 94%.

The difference between the accuracy of the inputted user signature in the device 1000 which is in a fixed state when registering a signature and the user state in which the hand shake is high, and the user state which is a high hand shake when the signature is authenticated, The user's authentication success rate may be reduced. In addition, in a user registration state of high hand shake in case of signature registration and a user state of low hand shake in case of signature authentication, the user authentication success rate may decrease due to the difference in the accuracy of the input user signature.

When the device 1000 in the fixed state when registering a signature and the user state and the device 1000 in the fixed state when the signature is authenticated differ from the user state, the controller 1010 changes the authentication success threshold (for example, , To reduce the success rate of identity verification. For example, when the device 1000 in the fixed state when registering a signature and the user state and the device 1000 in the fixed state when the signature is authenticated are different from each other, the controller 1010 may determine an authentication success threshold of 85. You can change from 65 to. In addition, when the user state for signature registration and the user state for signature authentication are different, the controller 1010 may change the authentication success threshold value from 93 to 74.

The difference between the accuracy of the inputted user signature in the device 1000 which is in a fixed state when registering a signature and the user state in which the high hand shake is high, and the user state which is a high hand shake when the signature is authenticated. The user's authentication success rate may be reduced. When both the device 1000 and the user state in the fixed state in the case of signature registration and signature authentication are in the state of high hand shake, the controller 1010 changes (eg, decreases) the authentication success threshold to increase the identity authentication success rate. Can be improved. For example, when both the signature registration and the signature authentication are in a state of high shaking, the controller 1010 may change the authentication success threshold from 82 to 71.

The authentication success threshold according to the embodiment of the present invention is one embodiment, and the authentication success threshold corresponding to the state of the apparatus 1000 and the state of the user (for example, hand shaking, walking, drinking, jogging, etc.). It will be readily understood by one of ordinary skill in the art that this can be changed. For example, in the case of signature registration, a combination of the device state and the user state of each of the device 1000 and the user state (e.g., hand shaking, walking, jogging, or drinking), which are in a fixed state (e.g., the device) The authentication success threshold may be changed according to the number of states X number of user states.

In step S1309 of FIG. 9, the device determines whether to verify signature.

The controller 1010 of the apparatus 1000 may determine whether to verify the signature in response to a comparison result of the stored signature information, the state information of the device and the user state information, the input signature information, the state information of the device, and the received user state information. have.

12 and 11, the controller 1010 of the apparatus 1000 may display a popup according to whether the signature is verified. When the input signature is authenticated, the controller 1010 displays a popup 1413 corresponding to the authentication success. Alternatively, when the input signature is authenticated, the controller 1010 may display a popup 1413 including authentication success and comments. When the popup 1413 is selected by the user, the flow proceeds to step S1310 of FIG. 9.

If the input signature fails authentication, the controller 1010 displays a popup 1414 corresponding to the authentication failure. Alternatively, when the input signature fails to be authenticated, the controller 1010 may display a popup 1414 including a retry 1414a and a cancel 1414b as well as the authentication failure. When the popup 1414 is selected by the user, the signature authentication method of the device ends.

In operation S1310 of FIG. 9, the apparatus performs a function.

The controller 1010 of the apparatus 1000 may perform a function corresponding to the signature authentication. For example, when the signature is verified, the controller 1010 may purchase a product through the shopping application 1410. In addition, the controller 1010 may release the screen lock of the apparatus 1000 by the authentication signature.

When the device 1000 performs the corresponding function, the signature authentication method of the device ends.

Method according to an embodiment of the present invention is implemented in the form of program instructions that can be executed by various computer means may be recorded on a computer readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. Program instructions recorded on the media may be those specially designed and constructed for the purposes of the present invention, or they may be of the kind well-known and available to those having skill in the computer software arts. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks. Magneto-optical media, and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

[Description of the code]

100: signature registration device 110: input unit

120: registration control unit 130: detection unit

140: storage unit 150: signature authentication device

160: input unit 170: authentication control unit

180: detection unit 190: storage unit

310: user's hand 320: mobile device

330: pitch of the mobile device 1000: device

1001: input pen 1020: control unit

1050: communication unit 1100: wearable device

1110: control unit 1130: communication unit

1150: detector

Claims (27)

In the signature registration device, An input unit for receiving a signature; A detector for detecting a state of the signature registration device; A storage unit; While the signature is input through the input unit, including a control unit for controlling to store the information on the state of the signature registration device and the information on the input signature detected through the detection unit to the storage unit, And the state of the signature registration device includes one of a fixed state and a gripped state. The method of claim 1, The sensing unit includes a sensor for sensing at least one of the tilt and acceleration of the signature registration device. The method of claim 2, And when the inclination of the detected signature registration device is within a predetermined range, the controller determines the state of the signature registration device as a fixed state. The method of claim 2, And when the acceleration of the detected signature registration device changes within a predetermined range, the controller determines the state of the signature registration device as a fixed state. In the signature registration method in the signature registration device, Receiving a signature; Determining a state of the signature registration device detected by a sensor while the signature is input; Storing information on the status of the signature registration device and information on the input signature; And the state of the signature registration device includes one of a fixed state and a gripping state. The method of claim 5, Determining the state of the signature registration device Detecting at least one of tilt and acceleration of the signature registration device. The method of claim 5, Determining the state of the signature registration device When the inclination of the detected signature registration device is a predetermined range, the state of the signature registration device to which the signature is input is determined to be a fixed state, And when the acceleration of the detected signature registration device is changed within a predetermined range, determining the signature registration device to which the signature is input as a fixed state. In the signature authentication device, An input unit for receiving a signature of a user; A detection unit for detecting a state of the signature authentication device while the signature is input through the input unit; When registering the signature, the storage unit for storing information about the pre-stored registration signature and the status of the device; The input signature is stored in the storage unit by using the pre-stored registration signature and information on the state of the device, the signature input through the input unit, and information on the state of the signature authentication device detected by the detection unit. A control unit for authenticating, And wherein the device state in the case of registering a signature includes one of a fixed state and a hold state, and the state of the signature authentication device includes one of a fixed state and a hold state. The method of claim 8, The sensing unit includes a sensor for sensing at least one of tilt and acceleration of the signature authentication device. The method of claim 9, The controller may determine that the signature authentication device to which the signature is input is fixed when the inclination of the detected signature authentication device is in a predetermined range, and the acceleration of the detected signature authentication device is changed within a predetermined range. And if it is determined that the signature authentication device to which the signature is input is fixed. The method of claim 8, When the state of the device and the state of the signature authentication device when registering the signature is different, the controller is characterized in that for changing the weight for each feature used to calculate the degree of matching between the pre-registered signature and the input signature; Device. The method of claim 8, And when the device state at the time of registering the signature is different from the state of the signature authentication device, the controller changes an authentication success threshold value used for authentication of the input signature. The method of claim 9, And when the device state at the time of registering the signature and the state of the signature authentication device are held, the controller changes the authentication success threshold used to authenticate the input signature downward. In the signature authentication method in a signature authentication device, Receiving a signature of a user; Determining a state of the signature authentication device in which the signature is input by a sensor; Authenticating the input signature by using information about a pre-registered signature and device status when registering a signature and information about the input signature and the status of the signature authentication device; The device state in the case of registering the signature includes one of a fixed state and a hold state, and the state of the signature authentication device includes one of a fixed state and a hold state. The method of claim 14, Determining the state of the signature authentication device, Detecting at least one of tilt and acceleration of the signature authentication device. The method of claim 14, Determining the state of the signature authentication device When the inclination of the detected signature registration device is a predetermined range, the state of the signature registration device to which the signature is input is determined to be a fixed state, And when the acceleration of the detected signature registration device is changed within a predetermined range, determining the signature registration device to which the signature is input as a fixed state. The method of claim 14, The authenticating step, And in response to the comparison of the state of the device and the state of the signature authentication device in case of registering the signature, changing the weight for each feature used for calculating the degree of matching between the pre-registered signature and the input signature. . The method of claim 14, The authenticating step And in response to the comparison of the state of the device and the state of the signature authentication device when registering the signature, an authentication success threshold value used for authentication of the input signature. 19. A computer-readable recording medium having recorded thereon a program for implementing the signature authentication method of any one of claims 14-18. In the signature authentication device, An input unit for receiving a signature of a user; A storage unit which stores information about pre-stored registration signatures and user states; A communication unit configured to receive information about a user state from the wearable device; Authenticating the input signature by using a registration signature previously stored in the storage unit and information on the user state, a signature input through the input unit, and information on the user state received from the wearable device through the communication unit. Apparatus comprising a control unit. The method of claim 20, The user state received from the wearable device includes a hand shake, a user shake, a user's motion, a walk, a jog, or a drinking state. The method of claim 20, When the user state in case of registering a signature and the user state in case of authenticating a signature are different, the controller changes weights for each feature used to calculate the degree of matching between the pre-registered signature and the input signature. Device. The method of claim 20, And when the device state in signature registration and the user state in signature authentication are different, the controller changes the authentication success threshold value used for authentication of the input signature. In the signature authentication device, An input unit for receiving a signature of a user; A detector for detecting a state of the signature authentication device while the signature is input through the input unit; A storage unit for storing previously stored registration signatures, user state information, and device state information; A communication unit configured to receive information about a user state from the wearable device; A registration signature previously stored in the storage unit, information on the user state and information on the device state, a signature input through the input unit, information on the user state received from the wearable device through the communication unit, and the detection And a control unit for authenticating the input signature by using information on the device state received from the unit. The method of claim 24, The user state received by the wearable device includes hand shaking, user shaking, user's motion, walking, jogging or drinking state. The state of the device received by the sensing unit comprises one of a fixed state and a gripping state. The method of claim 24, The controller is used to calculate the degree of matching between the pre-registered signature and the input signature when the user state and the device state when the signature is registered and the user state and the device state when the signature are authenticated are different. Device for changing the star weights. The method of claim 24, When the device state when the signature is registered, the device state when the device state and the user state when the signature authentication is different, and the device state is different, the controller changes the authentication success threshold value used for authentication of the input signature to be reduced. Device characterized in that.

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