John the Ripper is a fast password cracker.  Its primary purpose is to
detect weak passwords.  Besides several crypt(3) password hash types
most 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.

For more information, consult the project's homepage and/or the
documentation installed in /usr/doc/john-1.8.0