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README.md

libsignal [WIP]

This go library is an implementation of the signal asynchronous messaging protocol modified for use in OpenBazaar.

Modifications include:

  • Removed all communication with the signal servers. This library only handles session state management, encryption, and decryption. It's up to you to implement a transport for the ciphertext.
  • Removed prekey transport. Again, you need to implement a method of getting Alice's prekey bundle to Bob so that Bob can send the first message.
  • Removed message metadata. Messages are not tagged with the recipient ID. This allows them to be stored on untrusted servers without leaking metadata. The cost, however, is that to decrypt a message one must iterative over all open sessions to decrypt the message. Assuming the number of sessions a user keeps open at any given time is relatively small, this shouldn't have scaling issues. It may be possible to improve the efficiency here by tagging each message with a shared secret that ratchets forward, but at the cost of more complexity.
  • [TODO] Identity keys switched to RSA (which is what OpenBazaar/IPFS uses).

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Custom implementation of the signal messaging protocol in Go

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