[Standards] OMEMO Key Agreement v2

Remko Tronçon remko at el-tramo.be
Wed May 31 18:36:44 UTC 2017


Here's a proposal for the OMEMO key exchange that requires *no* changes to
libsignal: Public Identity keys are Ed25519 keys with the highest bit (sign
bit) 0.

- LibSignal-based clients convert their internal Curve25519 identity key to
Ed25519 right before the device bundle publish IQ, and convert the peer key
to Curve25519 when fetching the bundle IQ.
- On device initialization, non-libsignal clients guarantee a keypair that
LibSignal can handle by generating identity keypairs until the highest bit
of the public key is set to 0 (there's a 1 in 2 chance).

Chris Ballinger seemed open to this proposal.

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