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Threema with Kenny Paterson, Matteo Scarlata and Kien Tuong Truong

Security Cryptography Whatever

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The Double Ratcheting Attack

Signal uses a different key for every message so you don't really care about the nonsense actually. The three is long term Diffie Hellman with your party at the other end. And so nonsense really matter whereas with the ratcheting, the double ratchet every message is a different different DiffieHellman. You could even set the nonce just to be the O0 string in signal as long as you only ever use each key once. Yeah, I love that double ratchet. It's so nice for stuff like this. Okay, so that's attack four and attack five. We thought it was a nice gun. Go on.

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