Comments by "LoneTech" (@0LoneTech) on "How Signal Instant Messaging Protocol Works (u0026 WhatsApp etc) - Computerphile" video.

  1. Signal's safety number isn't one hash of both keys; it's a hash of each key, so a pair of fingerprints, sorted so it looks the same on both screens. One half is always your fingerprint.
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  2. The fingerprint is literally a hash of a public key, though. What's unclear (deliberately) is that there are two, sorted for consistency.
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