[Cryptography-dev] "intrinsic" symmetric key identifier?

[lvh]

… esprit de l’escalier: there’s also the difference between public-parameter hashes and a PRF, and BLAKE2 will do both for you. So, are you trying to identify a key in such a way that Eve can not detect the key being reused (but Bob shares a key with you), or is that OK?

lvh
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