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Elon's Encrypted DMs with Matthew Garrett
Security Cryptography Whatever
The Diffie-Hellman Key Exchange Problem
Signals attachments are not unencrypted. They're encrypted with a like an out of band secret that's derived from your current session or whatever. So I don't think they're using GCM either. But like, no, they're using a CBC with HMac. So it's authenticated encryption, but it's, it's not GCM.
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