john: John the Ripper (Password cracker) john: john: John the Ripper is a fast password cracker, currently available for john: many flavors of Unix (11 are officially supported, not counting john: different architectures), DOS, Win32, BeOS, and OpenVMS. Its primary john: purpose is to detect weak Unix passwords. Besides several crypt(3) john: password hash types most commonly found on various Unix flavors john: supported out of the box are Kerberos AFS. john: john: john: