WO2009039784A1 - Method and system for encrypting program stream key in broadcast-mode mobile tv service - Google Patents

Abstract

The invention discloses a method for encrypting program stream key in broadcast-mode mobile TV service, which comprises the steps of : multiple communication links are built between the service platform and the broadcast television network, wherein every communication link is designated to act as the program stream key encryption channel of one mobile network; the broadcast television network transmits the program stream key to the service platform through at least one of the links; the service platform determines as what kind of mobile network's program stream encryption channel the communication link receiving the program stream key is designated to act, then utilizes the program stream key encryption mode of this mobile network to encrypt the program stream key. The service platform returns the encrypted program stream key to the broadcast television network. A system for encrypting program stream key in broadcast-mode mobile TV service is also provided. Since only one service platform is needed to build to bear encrypting program stream keys from multi-type mobile networks, the system construction cost is reduced, and it is beneficial for system management and maintenance.

Description

 Method and system for encrypting program stream key in broadcast mobile TV service

Technical field

The present invention relates to the field of data service technologies, and in particular, to a method and system for encrypting a program stream key in a broadcast mobile TV service.

Background technique

 At present, the broadcast mobile TV service is increasingly valued by many operators because it is not limited by bandwidth, and has been considered as the focus of future business development. The so-called broadcast mobile TV service refers to transmitting digital audio and video content to a mobile terminal having an operating system and a video function in a broadcast form, and realizing management and charging for services and users by using a two-way channel of the mobile network. Among them, key management is an important part of the broadcast mobile TV service. When the user of the mobile terminal prepares to watch the TV program, it will receive the encrypted program stream key from the broadcast television network and the program encrypted by the program stream key. Streaming, at this time, the mobile terminal can parse the program stream key by using the obtained service key, and then the mobile terminal uses the program stream key to decrypt the encrypted program stream, and then the multimedia video content can be viewed. The encryption technology of the program stream key is indispensable for key management.

 Patent application No. CN200610078904, Chinese patent application "Mobile TV broadcast control system and broadcast network and broadcast method", discloses a method for encrypting program stream key of service platform, that is: the service platform receives the broadcast by the broadcast television network After the program stream key is obtained, the program stream key is encrypted by the service key, and then the service platform returns the encrypted program stream key to the broadcast television network. The shortcomings of the Chinese patent application CN200610078904 are: Some mobile operators may operate multiple mobile networks at the same time, such as the 3GPP (3rd Generation Partnership Project) system network and the 3GPP2 system network, but in different In a mobile network, the way to encrypt a program stream key with a service key is different. Accordingly, terminals of different mobile networks also decrypt the program stream key in different ways. However, the Chinese patent application CN200610078904 does not use different encrypted program stream key methods for different mobile networks. Therefore, the Chinese patent application CN200610078904 cannot implement a service platform to simultaneously support program stream key encryption of multiple mobile networks.

In summary, the technology of program stream key encryption in the existing broadcast mobile TV service is actually There are obviously inconveniences and defects in use, so it is necessary to improve. Summary of the invention

 In view of the above drawbacks, the technical problem to be solved by the present invention is to provide a method and system for encrypting a program stream key in a broadcast mobile TV service, which can implement a program platform to simultaneously support program stream key encryption of multiple mobile networks. Therefore, the construction cost of the system can be reduced, and the management and maintenance of the system is facilitated.

 In order to solve the above technical problem, the present invention provides a method for encrypting a program stream key in a broadcast mobile TV service, for a system including a service platform and a broadcast television network, the method comprising: A. Establishing a plurality of communication links between the broadcast television networks, and each communication link is designated as an encrypted channel of a program stream key of the mobile network;

 B. The broadcast television network transmits the program stream key to the service platform via at least one of the communication links;

 C. The service platform determines an encryption channel of a program stream key designated by the communication link that receives the program stream key, and uses the program stream key encryption method of the mobile network to the program. The stream key is encrypted;

 D. The service platform returns the encrypted program stream key to the broadcast television network. Further, the mobile network may include: a 3GPP system network and/or a 3GPP2 system network. Further, the 3GPP system network includes: a GPRS network, a WCDMA network, and a TD-SCDMA network.

 Further, the 3GPP2 system network includes: a CDMA2000 network.

 Further, the present invention can have the following features:

In the step A, the communication link between the service platform and the broadcast television network is two, and the service platform specifies one of the communication links to be an encrypted channel of the program stream key of the 3GPP system network, and the designated The other communication link is an encrypted channel of the program stream key of the 3GPP2 system network; in the step B, the broadcast television network separately transmits a program stream key encryption request to the service platform through the two communication links. a message, the request message includes at least a program stream key; In the step C, when the service platform determines that the communication link of the request message encrypted by the program stream key is received, if the communication link is designated as an encrypted channel of the program stream key of the 3GPP system network, The program stream key is encrypted by the program stream key encryption method of the 3GPP system network; if the communication link is designated as the encryption channel of the program stream key of the 3GPP2 system network, the program stream key encryption method of the 3GPP2 system network is used. Encrypting the program stream key;

 In the step D, the service platform returns a response message of the program stream key encryption to the broadcast television network, and the response message includes at least the encrypted program stream key.

The present invention also provides a system for encrypting a program stream key in a broadcast mobile TV service, the system comprising a service platform and a broadcast television network, and a plurality of communication links are established between the service platform and the broadcast television network, each The communication link is designated as an encrypted channel of the program stream key of the mobile network;

 The broadcast television network, configured to transmit the program stream key to the service platform by using at least one of the communication links;

 The service platform is configured to determine, according to an encrypted channel of a program stream key of a mobile network, a communication link that receives the program stream key, and use the program stream key encryption method of the mobile network The stream key is encrypted, and the encrypted program stream key is returned to the broadcast television network.

 Further, the mobile network may include: a 3GPP system network and/or a 3GPP2 system network. Further, the 3GPP system network includes: a GPRS network, a WCDMA network,

TD-SCDMA network.

 Further, the 3GPP2 system network includes: a CDMA2000 network.

 Further, the system of the present invention can have the following features:

 There are two communication links between the service platform and the broadcast television network, and the service platform specifies one of the communication links as an encrypted channel of the program stream key of the 3GPP system network, and another communication link is designated as 3GPP2. An encrypted channel of the program stream key of the system network;

The broadcast television network transmits, by the two communication links, the program stream key encryption request message to the service platform, where the request message includes at least the program stream key; The service platform, when determining the communication link where the request message for encrypting the program stream key is received, if the communication link is designated as an encrypted channel of the program stream key of the 3GPP system network, using the 3GPP system network The program stream key encryption method encrypts the program stream key; if the communication link is designated as an encryption channel of a program stream key of the 3GPP2 system network, the program stream key encryption method of the 3GPP2 system network is used to The program stream key is encrypted; and the program stream key encrypted response message is returned to the broadcast television network, and the response message includes at least the encrypted program stream key.

The invention establishes a plurality of communication links between the service platform and the broadcast television network, and each communication link is designated as an encrypted channel of the program stream key of the mobile network, that is, the service platform determines the received program stream key. The communication link is designated as the mobile network transmission program stream key, and the program stream key is encrypted using the encrypted program stream key of the mobile network, thereby operating the mobile operation of multiple mobile networks simultaneously In terms of business, only one service platform can support the program stream key encryption of multiple mobile networks at the same time, and use different encrypted program stream key methods for different mobile networks, such as the service platform supporting both 3GPP system networks and The program stream key of the 3GPP2 system network is encrypted, which reduces the construction cost of the system and is beneficial to the management and maintenance of the system. BRIEF abstract

 1 is a system structural diagram of program stream key encryption in a broadcast mobile TV service according to the present invention; FIG. 2 is a system structure diagram of a preferred program stream key encryption according to the present invention;

 3 is a flow chart of a method for encrypting a program stream key in a broadcast mobile TV service according to the present invention; and FIG. 4 is a flow chart of a preferred method for encrypting a program stream key according to the present invention.

Preferred embodiment of the invention

 The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

1 shows a system structure for program stream key encryption in a broadcast mobile TV service provided by the present invention. The system 100 mainly includes a service platform 10 and a broadcast television network 20, and the service platform 10 and N mobile networks. 40 communication connection, that is, the service platform 10 can support moving to N kinds Network 40 provides key management functions for broadcast mobile TV services.

 The mobile network 40 includes a 3GPP system network and/or a 3GPP2 system network, the 3GPP system network including GPRS, WCDMA, TD-SCDMA networks, and the 3GPP2 system network includes a CDMA2000 network.

 N communication links 30 are established between the service platform 10 and the broadcast television network 20, each of which is designated as an encrypted channel of the program stream key of the mobile network 40.

 The broadcast television network 20 is mainly used to provide broadcast television program content and related management information. In the present invention, the broadcast television network 20 is configured to transmit a program stream key to the service platform 10 via at least one communication link 30 and obtain an encrypted program stream key. In fact, the broadcast television network 20 can simultaneously transmit N sets of program stream keys to the service platform 10 via the N communication links 30, and obtain N sets of encrypted program stream keys.

 The service platform 10, generally provided by the mobile operator, provides key management functions for the broadcast mobile TV service for users of the various mobile networks it operates. In the present invention, the service platform 10 is mainly used for judging the encrypted channel of the program stream key designated by the communication link 30 of the received program stream key as the mobile network 40, and encrypting the program stream key using the mobile network 40. The program stream key is encrypted, and the encrypted program stream key is returned to the broadcast television network 20. The service platform 10 of the present invention can simultaneously support program stream key encryption of a plurality of mobile networks 40, and use different encrypted program stream key modes for different mobile networks 40, respectively.

 FIG. 2 shows a system structure of a preferred program stream key encryption according to the present invention. The system 100 mainly includes a service platform 10 and a broadcast television network 20, and the service platform 10 is respectively connected to the 3GPP system network 41 and the 3GPP2 system network 42. That is, the service platform 10 can support key management functions for providing broadcast mobile TV services to two mobile networks.

 Two communication links 31 and 32 are established between the service platform 10 and the broadcast television network 20, and the service platform 10 specifies that the communication link 31 is an encrypted channel of the program stream key of the 3GPP system network 41, and the designated communication link Path 32 is an encrypted channel for the program stream key of the 3GPP2 system network 42.

The broadcast television network 20 is configured to transmit, by the two communication links 31 and 32, a request message for encrypting the program stream key to the service platform 10, where the request message includes at least a program stream key, and obtains a program stream key encryption. The response message includes at least the encrypted program stream key. The service platform 10 is configured to determine, according to the encrypted channel of the program stream key of the mobile network 40, the communication link 30 where the request message for receiving the program stream key encryption is located, and the program stream key designated as the 3GPP system network 41. The encrypted channel (communication link 31) encrypts the program stream key using the program stream key encryption method of the 3GPP system network 41. The program stream key encryption method of the 3GPP system network is well known to those skilled in the art. The technique, ie: encrypting the program stream key with the corresponding service key; if it is the encryption channel (communication link 32) designated as the program stream key of the 3GPP2 system network 42, encrypting with the program stream key of the 3GPP2 system network 42 The program stream key is encrypted in a manner, and the program stream key encryption method of the 3GPP2 system network belongs to a well-known technology well known to those skilled in the art, that is, generated by a corresponding BAK (Broadcast Access Key). SK (Short-term Key) encrypts the program stream key; returns the program stream key encrypted response message to the broadcast television network 20, and the response message At least the encrypted program stream key is included, so that the service platform 10 supports the program stream key encryption of the 3GPP system network 41 and the 3GPP2 system network 42 at the same time.

 Additionally, the 3GPP system network includes, but is not limited to, a GPRS, WCDMA, TD-SCDMA network, and the 3GPP2 system network includes, but is not limited to, a CDMA2000 network.

 FIG. 3 is a flowchart of a method for encrypting a program stream key in a broadcast mobile TV service according to the present invention. The method is implemented by the system 100 shown in FIG.

 Step S301, N communication links 30 are established between the service platform 10 and the broadcast television network 20, and each communication link 30 is designated as an encrypted channel of the program stream key of the mobile network 40. The mobile network includes a 3GPP system network and/or a 3GPP2 system network, the 3GPP system network includes a GPRS, WCDMA, TD-SCDMA network, and the 3GPP2 system network includes a CDMA2000 network.

 Step S302, the broadcast television network 20 transmits the program stream key to the service platform 10 via at least one of the communication links 30. Of course, the broadcast television network 20 can also simultaneously transmit N sets of program stream keys to the service platform 10 through all of the N communication links 30.

Step S303, the service platform 10 determines the encrypted channel of the program stream key designated by the communication link 30 of the received program stream key as the mobile network 40, and uses the program stream key encryption method of the mobile network 40 to program the program. The stream key is encrypted. For example, the program stream key is performed by the program stream key encryption method of the 3GPP system network or the program stream key encryption method of the 3GPP2 system network. Encrypted.

 Step S304, the service platform 10 returns the encrypted program stream key to the broadcast television network 20. FIG. 4 shows a flow of a method for encrypting a preferred program stream key according to the present invention. The service platform 10 is respectively connected to the 3GPP system network 41 and the 3GPP2 system network 42 by using the system 100 shown in FIG. Platform 10 can support key management functions that provide broadcast mobile TV services to both mobile networks. The specific steps of this method are described as follows:

 Step S401, two communication links 31 and 32 are established between the service platform 10 and the broadcast television network 20, and the service platform 10 specifies that the communication link 31 is an encrypted channel of the program stream key of the 3GPP system network 41, and is designated. Communication link 32 is an encrypted channel for the program stream key of 3GPP2 system network 42. The 3GPP system network includes a GPRS, WCDMA, TD-SCDMA network, and the 3GPP2 system network includes a CDMA2000 network.

 Step S402, the broadcast television network 20 transmits a program stream key encrypted request message to the service platform 10 through the two communication links 31 and 32, respectively, and the request message includes at least a program stream key.

 Step S403, the service platform 10 determines, as the encrypted channel of the program stream key of the mobile network 40, the communication link 30 where the request message for receiving the program stream key encryption is located, if it is the program stream key designated as the 3GPP system network 41. The encrypted channel is then executed in step S404; if it is the encrypted channel designated as the program stream key of the 3GPP2 system network 42, step S405 is performed.

 Step S404, the service platform 10 encrypts the program stream key by using the program stream key encryption method of the 3GPP system network 41, and then proceeds to step S406.

 Step S405, the service platform 10 encrypts the program stream key by using the program stream key encryption method of the 3GPP2 system network 42, and then proceeds to step S406.

 Step S406, the service platform 10 returns a response message of the program stream key encryption to the broadcast television network 20, and the response message includes at least the encrypted program stream key.

In summary, the present invention establishes a number of communication links between a service platform and a broadcast television network, and each communication link is designated as an encrypted channel of a program stream key of the mobile network, and the service platform determines the received program. The communication link of the stream key is designated as the encrypted channel of the program stream key of the mobile network, and the program stream key is encrypted using the program stream key encryption method of the mobile network. Line encryption, for mobile operators operating multiple mobile networks at the same time, only need to build a service platform to simultaneously support program stream key encryption of multiple mobile networks, and use different encrypted programs for different mobile networks. The stream key mode, for example, the service platform supports the program stream key encryption of the 3GPP system network and the 3GPP2 system network at the same time, thereby reducing the construction cost of the system and facilitating system management and maintenance.

 It is a matter of course that the invention may be embodied in various other forms and modifications without departing from the spirit and scope of the invention.

Claims

Claim  A method for encrypting a program stream key in a broadcast mobile TV service, for a system comprising a service platform and a broadcast television network, characterized in that the method comprises the following steps:  A. establishing a plurality of communication links between the service platform and the broadcast television network, and each communication link is designated as an encrypted channel of a program stream key of the mobile network;  B. The broadcast television network transmits the program stream key to the service platform via at least one of the communication links;  C. The service platform determines an encryption channel of a program stream key designated by the communication link that receives the program stream key, and uses the program stream key encryption method of the mobile network to the program. The stream key is encrypted;  D. The service platform returns the encrypted program stream key to the broadcast television network. 2. The method according to claim 1, wherein the mobile network comprises: a third generation partnership plan 3GPP system network and/or a 3GPP2 system network.  The method according to claim 2, wherein the 3GPP system network comprises: a GPRS network, a WCDMA network, and a TD-SCDMA network.  4. The method according to claim 2, wherein the 3GPP2 system network comprises: a CDMA2000 network.  5. The method of claim 2, 3 or 4, characterized in that In the step A, the communication link between the service platform and the broadcast television network is two, and the service platform specifies one of the communication links to be an encrypted channel of the program stream key of the 3GPP system network, and the designated The other communication link is an encrypted channel of the program stream key of the 3GPP2 system network; in the step B, the broadcast television network separately transmits a program stream key encryption request to the service platform through the two communication links. a message, the request message includes at least a program stream key; in the step C, when the service platform determines the communication link where the request message encrypted by the program stream key is received, if the communication link is designated as The encryption channel of the program stream key of the 3GPP system network encrypts the program stream key by using the program stream key encryption method of the 3GPP system network; if the communication link is designated as the encryption channel of the program stream key of the 3GPP2 system network , use The program stream key encryption method of the 3GPP2 system network encrypts the program stream key; in the step D, the service platform returns a response message of the program stream key encryption to the broadcast television network, and the response message includes at least the encrypted Program stream key.  A system for encrypting a program stream key in a broadcast mobile TV service, characterized in that the system comprises a service platform and a broadcast television network, and a plurality of communication links are established between the service platform and the broadcast television network. Each communication link is designated as a dense channel of the program stream key of the mobile network;  The broadcast television network, configured to transmit the program stream key to the service platform by using at least one of the communication links;  The service platform is configured to determine, according to an encrypted channel of a program stream key of a mobile network, a communication link that receives the program stream key, and use the program stream key encryption method of the mobile network The stream key is encrypted, and the encrypted program stream key is returned to the broadcast television network.  The system according to claim 6, wherein the mobile network comprises: a 3GPP system network and/or a 3GPP2 system network.  The system according to claim 7, wherein the 3GPP system network comprises: a GPRS network, a WCDMA network, and a TD-SCDMA network.  9. The system according to claim 7, wherein the 3GPP2 system network comprises: a CDMA2000 network.  10. A system according to claim 7, 8 or 9, characterized in that  There are two communication links between the service platform and the broadcast television network, and the service platform specifies one of the communication links as an encrypted channel of the program stream key of the 3GPP system network, and another communication link is designated as 3GPP2. An encrypted channel of the program stream key of the system network;  The broadcast television network transmits the program stream key encryption request message to the service platform by using the two communication links, and the request message includes at least the program stream key; The service platform, when determining the communication link where the request message for encrypting the program stream key is received, if the communication link is designated as an encrypted channel of the program stream key of the 3GPP system network, using the 3GPP system network The program stream key encryption method encrypts the program stream key; The communication link is designated as an encryption channel of the program stream key of the 3GPP2 system network, and the program stream key is encrypted by the program stream key encryption method of the 3GPP2 system network; and the program stream key encryption is returned to the broadcast television network. The response message includes at least the encrypted program stream key in the response message.