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Question to the crypto ppl: is there a known attack on AES, that deals with the fact that the same key is used for an AES128/192 and AES256 encryption (talking about CPA attacks and one half of the 256 bit key == 128 bit key). Just wonderd what the complexity of such an attack is
From looking at the AES spec it seems like it's not a huge improvement because the second round key differs (and with that each other round key?), but I still wanna know :p
I just realized that CPA is also short for correlation power analysis, I meant chosen plaintext attack. Sry if that causes confusion :|
Yes you actually have a new key each round
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