Next up is the first symmetric crypto session, starting with Attacks only get better: The case of OCB2 by Tetsu Iwata
#realworldcrypto
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If we encrypt the same message twice, the nonce will* be different and the ciphertext will be different. * CAVEAT EMPTOR
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Simplest attack is a minimal forgery (existential forgery), adversary must know content of the message, it might not be that important but it's still not generated by the original sender.
#realworldcryptopic.twitter.com/X1ibibpXF3
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On its own may not mean much, but can be leveraged into more powerful attacks.
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Universal forgery: for any nonce and message (possibly chosen by the adversary), can compute ciphertext and tag that will be accepted as legit
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crypto as in 'cryptography'