The deal with bcrypt is that you can increase the number of work units, so that bcrypt gets slower and slower as you like. That defeats the ability to very quic

The deal with bcrypt is that you can increase the number of work units, so that bcrypt gets slower and slower as you like. That defeats the ability to very quickly iterate over a dictionary, because it simply takes too long to do effectively. (Please correct any of this if I'm wrong. IANACryptographer.)