I've used it. Two BIG thumbs up. Works like a charm. In addition to John the Ripper, here are a few more you may want to look into. I haven't used all
of them, but most of them. Some are easier to use than others, but all work as advertised. In no particular order:
- crackerjack (*nix -- one of the best, IMHO)
- l0phCrack (Win32)
- Qcrack (*nix)
- ScanNT (Win32)
- crack (*nix)
- Hades (*nix)
- NTCrack (Win32)
- Hellfire Cracker (*nix)
Something that I've done in the past that has worked well, which encourages users to use Good Passwords, is to hold a contest, and whoever's password lasts the longest against several of the above, they get some sort of prize. In my experience, it works better to encourage good password practices than to harp at people for bad passwords.
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