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Because it actually hardly matters at all?

It's salted enough that it's not amenable to a time-space optimisation and it's pessimised enough to make trivial attacks impractical so bad guys who have the database will resort to brute force on individual passwords. At which point either you have a good password and they can't guess it or you don't.

Fancier schemes are about the margin, can we make it too expensive to brute force say 8 alphanumerics? But you don't need to live in the margins and you shouldn't.



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