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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: