Planning to enhance password security by storing passwords with 2 different hashes. The goal is to minimize collisions and boost overall security level. First question: Is this strategy worth the effort given that collisions are already quite rare? Second question: Which combination of hashing algorithms would work best for this purpose? Would using sha-1 and sha-256 result in more collisions compared to a mix of sha-256 and another unrelated algorithm like blowfish?
So let me make sure I got this right - you're looking to save the hashed password twice using two distinct hashing algorithms in your database, is that correct? To achieve this, all you need to do is utilize two hash algorithms that generate varying lengths of output. This ensures there will be no possibility of collision between the two separate hashes.
For example, you could consider using sha1 and md5 which both offer differing lengths of output.
My suggestion is to go with sha1 and not stress about collisions. The probability of a sha1 collision is extremely low (10^-45), as discussed in this article Probability of SHA1 collisions. Unless you are expecting a massive number of users, collisions should not be a concern.
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