vendredi 30 janvier 2015

DES-CBC: Two ciphertext blocks c2 and c5 are equal. Why would this leak information?



Here, suppose that we were able to observe the ciphertext that we know had been encrypted in CBC mode, then how knowing of c2 and c5 ciphertext blocks would leak information ?


My professor asked us in the class and told us to think about it and gave us hint what would happen if we knew one of the plaintext blocks m2?





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