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MD4 is Not One-Way. The attack described in the 2008 paper is a theoretical attack with complexity $2^{102}$, which is better than the brute force complexity of $2^{128}$. In later theoretical results reported here the complexity dropped to $2^{94.98}$ and here it dropped even further to $2^{69.4}$ for secondary pre-image attacks. Similarly, The MD2 Hash ...


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As I understand it, preimage resistance means that it is hard for an adversary to find two messages that produce the same digest Nope: collision resistance means that it is hard for an adversary to find two (distinct) messages that produce the same digest. Preimage resistance means that, given a hash output, it is hard for an adversary to find a ...



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