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SHA-1 is a hash function that is two generations old, no longer considered secure for all uses and should only be used for backward compatibility.
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How hard is it to generate a simultaneous MD5 and SHA1 collision?
I was recently reading that MD5 is "broken" because it's pretty easy to generate collisions (like 2^(L/2)). And the SHA1 (theoretically) fares no better. The solution seems to be hash algorithms that …