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 1 of 3 video series on John the Ripper . The first part covers introduction and installation of John the Ripper .
source : livehacking from Youtube
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Actually i'm using this tool only for Hash cracking :)
as mentioned above you can do a lot with this. watch all the part.
If you are using window then cain and abel is best.
Very detail explanation. thanks
Alexander Peslyak Developed Best tool For Network Penetration Testing.