Description: John the Ripper is a fast password cracker. Currently it is available for many flavors of linux and unix. It is a free password cracking software tool. Primarily it was developed for the UNIX operating system, but now it currently runs on fifteen different platforms (11 Unix flavors, DOS, Win32, BeOS, and OpenVMS). John the Ripper combines a number of password crackers into one package. It can also detect password hash types.
According to wikipedia John the Ripper can be run against various encrypted password formats including several crypt password hash types most commonly found on various Unix flavors (based on DES, MD5, or Blowfish), Kerberos AFS, and Windows NT/2000/XP/2003 LM hash. Additional modules have extended its ability to include MD4-based password hashes and passwords stored in LDAP, MySQL, and others.
This video is part 2 of 3 video series on John the Ripper . The 2nd part covers actual password cracking with John the Ripper. In video password file of a linux based system is cracked.
source : livehacking from Youtube
Tags: John_The_Ripper ,
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Johnny is the GUI for John the Ripper.
http://openwall.info/wiki/john/johnny
What about Cain and Abel ??
Both are great tool but cain and able is not for linux.
Good Explanation.