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signalapp / libsignal

Home to the Signal Protocol as well as other cryptographic primitives which make Signal possible.
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What is KyberPreKeyStore in signalDecryptPreKey? #547

Closed joesteen2135 closed 6 months ago

joesteen2135 commented 6 months ago

When attempting to decrypt a pre key message in Swift, it requests KyberPreKeyStore as a parameter, however I see no mention of it anywhere else, so what is it?

jrose-signal commented 6 months ago

Kyber keys are part of PQXDH, the protocol for establishing sessions. They work a lot like the Curve25519 keys in PreKeyStore, except that you're expected to have a "last resort key" that doesn't get thrown away after being used, in case all of the "one-time" keys have been used up.

This would be another good question for https://community.signalusers.org/.