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There is a security tradeoff with tunable workfactor based hashing systems (bcrypt and co) - it is really quite easy to launch a DoS against such a scheme since by design they consume system resources. Sure, that's not the same issue as a data breach, but if 2011 is any indication DoS is popular in a big way again among a certain particular populace. As for salting - it has an exponential effect on the work to crack regardless of whether the salt is secret or not. with a salt you have to brute force passwords per user, since for a given user it is necessary to go through + user specific salt for every user specific salt.
Commented Apr 6, 2012 on
Hashes are a bit like fingerprints for data. A given hash uniquely represents a file, or any arbitrary collection of data. At least in theory. This is a 128-bit MD5 hash you're looking at above, so it can represent at most 2128 unique items, or 340 trillion trillion trillion. In reality the...
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