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What is the probability that both [Hu] = [Hmu] and [He] = [Hme]. In english, what is the chance that two different files can have identical hashes in both an unencrypted and encrypted form? Depends on whether they are "random" files or attacker controlled. MD5 is a 128-bit hash, so for two random files that differ the probability that they have the ...


By 'IHV', I assume you mean the Initial Hash Vector; that is, the state of the hash function before you start hashing. Well, if they aren't using the standard initial values (specified by the hash function definition), well, there isn't much you can do. The problem is that the compression function used by Merkle-Damgaard hash functions (such as MD5 or ...

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