Le quintidi 5 ventôse, an CCXXIV, arian a écrit : > where do you get that these are "insufficient for absolute certainty"? > (beside maybe md4) > there are no known collisions in sha1 and better, and even md4's preimage > attack has complexity 2^102. [1,2]
There are collisions for SHA1 as soon as the files are larger than 20 bytes. The same applies to SHA-2 with the corresponding size. The collisions are not known, and very unlikely, but "absolute" means absolute, not "very likely". Regards, -- Nicolas George
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