Christopher Allen

Christopher Allen

Berkeley, California, United States
2K followers 500+ connections

About

Christopher Allen is a world-renowned authority on decentralized digital trust, online…

Articles by Christopher

  • The Exodus Protocol: Building Infrastructure That Can’t Fail You

    What would it mean to build infrastructure that can’t fail you? Not systems that never break — but systems no one else…

  • 2025 Q3 Blockchain Commons Report

    The Q3 2025 Quarterly Report from Blockchain Commons is here! Advancing Bitcoin FROST signing, strengthening…

  • When Technical Standards Meet Geopolitical Reality

    Reports have been coming back from the Global Digital Collaboration conference (#GDC25), and they're pretty…

    3 Comments
  • 🛠️ Can you trust a Git repo?

    Today marks 20 years since Git’s birth. Our digital world now runs on its foundations—but trust was never part of its…

  • The Identity Tragedy of WWII & The Perils of Today

    Last year, on #Foremembrance Day (March 27th), I spoke about the tragic consequences of identity mismanagement during…

  • Why #FreedomToTransact Must Be Recognized as a Fundamental Human Right

    The Universal Declaration of Human Rights (UDHR) enshrines essential freedoms—speech, assembly, movement, and property…

    1 Comment
  • How My Values Inform Design

    What are the principals of design for enabling autonomy, dignity, and trust in digital systems? I wrote a list of ten…

  • Building Trust in Gradients

    In real life, we extend trust gradually, slowly learning about people we're interacting with & revealing more of…

    8 Comments
  • Has our SSI Ecosystem Become Morally Bankrupt?

    (This topic was presented at #IIW XXXIX Fall 2024 on October 29, 2024, and is a cross-post of the original in my…

    7 Comments
  • Open & Fuzzy Cliques

    Last week, I introduced "cryptographic cliques"—a novel way to view identity based on your connections and…

Activity

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Experience

  • Blockchain Commons

    San Francisco Bay Area

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    Berkeley, CA

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    Greater Seattle Area

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    San Francisco Bay Area

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Publications

  • iPhone and iPad in Action: Introduction to SDK Development (second edition)

    Manning Publications Co

    This hands-on tutorial will help you master iPhone/iPad development using the native iPhone SDK. It guides you from setting up dev tools like Xcode and Interface Builder, through coding your first app, all the way to selling in the App Store.

    Using many examples, the book covers core features like accelerometers, GPS, the Address Book, and much more. Along the way, you'll learn to leverage your iPhone skills to build attractive iPad apps. This is a revised and expanded edition of the…

    This hands-on tutorial will help you master iPhone/iPad development using the native iPhone SDK. It guides you from setting up dev tools like Xcode and Interface Builder, through coding your first app, all the way to selling in the App Store.

    Using many examples, the book covers core features like accelerometers, GPS, the Address Book, and much more. Along the way, you'll learn to leverage your iPhone skills to build attractive iPad apps. This is a revised and expanded edition of the original iPhone in Action.

    Other authors
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  • iPhone in Action: Introduction to Web and SDK Development (first edition)

    Manning Publications Co

    The iPhone explodes old ideas of a cell phone. Its native SDK offers a remarkable range of features including easy-to-build graphical objects, a unique navigation system, and a built-in database, all on a location-knowledgeable device. Websites and web apps can now behave like native iPhone apps, with great network integration.

    iPhone in Action is an in-depth introduction to both native and web programming for the iPhone. You'll learn how to turn your web pages into compelling iPhone web…

    The iPhone explodes old ideas of a cell phone. Its native SDK offers a remarkable range of features including easy-to-build graphical objects, a unique navigation system, and a built-in database, all on a location-knowledgeable device. Websites and web apps can now behave like native iPhone apps, with great network integration.

    iPhone in Action is an in-depth introduction to both native and web programming for the iPhone. You'll learn how to turn your web pages into compelling iPhone web apps using WebKit, iUI, and Canvas. The authors also take you step by step into more complex Objective-C programming. They help you master the iPhone SDK including its UI and features like accelerometers, GPS, the Address Book, SQLite, and many more. Using Apple's standard tools like Dashcode, Xcode, and Interface Builder, you'll learn how to best use both approaches: iPhone web and SDK programming.

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  • RFC 2245 - The TLS Protocol Version 1.0

    IETF.ORG

    TLS is the standards version of the most widely deployed security protocol in the world, SSL.

    TLS, meaning “Transport Layer Security”, is the protocol that is used for establishing a secure connection between a client and a server, typically but not exclusively for web connections to internet commerce shopping carts, credit card companies, etc. Protocols such as HTTP, SMTP, POP3 and others use TLS to create secure connections.

    TLS is able to authenticate both the client and the…

    TLS is the standards version of the most widely deployed security protocol in the world, SSL.

    TLS, meaning “Transport Layer Security”, is the protocol that is used for establishing a secure connection between a client and a server, typically but not exclusively for web connections to internet commerce shopping carts, credit card companies, etc. Protocols such as HTTP, SMTP, POP3 and others use TLS to create secure connections.

    TLS is able to authenticate both the client and the server while it creates an encrypted connection between them both. The TLS protocol is extensible which means that new algorithms can be added as long as both the server and the client know about the new algorithms. TLS is meant to be a replacement for Netscape's original SSL protocol.

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