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Can we exhibit collisions, or second-preimages (with implies the former), for the ChaCha core? No, likely not. The Salsa20 and ChaCha cores both consist of a large number of "quarter-rounds" each of which is invertible and bijective. The only reason neither core is a bijection (and thus can have collisions) is the final addition of the input elements ...


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The easiest, zero thought, way to get an answer to this question is to ask the computer. Using Dylan's cryptol implementation it is straight-forward to ask a question: m1 != m2 ==> ChaChaCore m1 != ChaChaCore m2 That is, if inputs m1 and m2 are not equal then the ChaCha core function will not be equal either. Cryptol doesn't (well, didn't) have an ...



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