John the Ripper is a fast password cracker, currently available for many flavors of Unix (11 are officially supported, not counting different architectures), Windows, DOS, BeOS, and OpenVMS. Its primary purpose is to detect weak Unix passwords. Besides several crypt(3) password hash types most
... [More] commonly found on various Unix flavors, supported out of the box are Kerberos AFS and Windows NT/2000/XP/2003 LM hashes, plus several more with contributed patches. [Less]
I finished my C md5 cracker finally, it's pretty fast but not comparable to that uses the GPU or those made in some scripting language.
It uses a not casual brute force and takes three command line arguments:
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