Information, Computer and Network Security Terms Glossary and Dictionary

John the Ripper

John the Ripper is a popular password-cracking tool, available for many flavors of Unix, Windows, DOS, BeOS, and OpenVMS. Its primary purpose is to detect weak Unix passwords. Besides several crypt 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.

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John the Ripper