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Everything about Signal Protocol

Non-federated cryptographic protocol

The Signal Protocol is a non-federated cryptographic protocol that provides end-to-end encryption for voice and instant messaging conversations. The protocol was developed by Open Whisper Systems in 2013 and was introduced in the open-source TextSecure app, which later became Signal. Several closed-source applications have implemented the protocol, such as WhatsApp, which is said to encrypt the conversations of "more than a billion people worldwide" or Google who provides end-to-end encryption by default to all RCS-based conversations between users of their Google Messages app for one-to-one conversations. Facebook Messenger also say they offer the protocol for optional "Secret Conversations", as did Skype for its "Private Conversations". Wikipedia →

🧭 Start here: a 6-step reading path

  1. Read the overview: Signal ProtocolA 5-minute orientation
  2. Skim a recent paper: A construction of post quantum secure and signal leakage resistant authenticated key agreement protocol for mobile communicationInfluential work since 2022
  3. Pick up a classic book: Data Communications Networking (McGraw-Hill Forouzan Networking)The most-reprinted book on the subject
  4. Read the landmark paper: Practical quantum key distribution protocol without monitoring signal disturbanceCited 315 times
  5. Go sideways: Double Ratchet AlgorithmA closely related topic
  6. Go sideways: TextSecureA closely related topic

📖 Definitions

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🏆 Landmark papers (most cited)

🆕 Influential since 2022

📚 Books worth reading

Ranked by number of editions on Open Library, a rough measure of how lasting a book is.

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