Passwords have a lot of different contexts. You don't mention how this is going to be used.
If it's for crypt(3) (like a basicauth password), characters past the 8th don't make any difference, for example. If it's for a human, it'd be nice to be somewhat pronouncable. If it's merely to confirm that an email address is the right one via a round-trip, it can be 64 hex characters instead.
So, tell us more about how this is to be used, and you'll get better answers.
-- Randal L. Schwartz, Perl hacker
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