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The most efficient related-key attacks on AES-256 and resulting weaknesses AES-256-based hash functions are summarized in my PhD thesis. Though collision and preimage attacks on hash functions are out of reach yet, the components of these functions still expose some properties that are not expected of good hash functions or random oracles. Getting to the ...


5

I don't know of any practical attacks on these schemes that would break collision-resistance or pre-image resistance, but the existence of related-key attacks on AES is still worrisome. The Miyaguchi-Preneel hash construction is better in this sense, because the attacker doesn't directly control anything that goes into the key input. Miyaguchi-Preneel is ...


1

It is safe, in the case that you have MACs which are independently keyed (or at the very least, the cryptographically secure MAC is independently keyed from all the other ones). This can be seen not by an argument from randomness, but from a simple observation that it were not true, then an attacker could attack the secure MAC by generating the insecure ...



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