John the Ripper

John the Ripper (http://www.openwall.com/john/) is a tool that can be used to crack the password hash. Currently, it can crack more than 40 password hash types, such as DES, MD5, LM, NT, crypt, NETLM, and NETNTLM. One of the reasons to use John instead of the other password-cracking tools described in this chapter is that John is able to work with the DES and crypt encryption algorithms.

To start the John tool, use the console to execute the following command:

 # john

This will display the John usage instructions on your screen.

John supports the following four password-cracking modes:

  • Wordlist mode: In this mode, you only need to supply the wordlist file and the password file to be cracked. A wordlist file is a text file ...

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