Crack Password with John the Ripper on Ubuntu 9.10. Submitted by Junjun Mao on Mon, - 15:56. This section describes how to probe weak user passwords on your system. The Saboteur Мод on this page. If the passwords are weak, hackers may guess user names and password and login to your system 'legally'. On Ubuntu 12.04 I created several users and passwords, then promptly proceeded to try to crack those passwords with John the ripper. One password is very strong, but.

John the Ripper password cracker John the Ripper password cracker John the Ripper is a fast password cracker, currently available for many flavors of Unix, Windows, DOS, and OpenVMS. Its primary purpose is to detect weak Unix passwords. Besides several crypt(3) password hash types most commonly found on various Unix systems, supported out of the box are Windows LM hashes, plus lots of other hashes and ciphers in the community-enhanced version. John the Ripper is free and Open Source software, distributed primarily in source code form. If you would rather use a commercial product tailored for your specific operating system, please consider, which is distributed primarily in the form of 'native' packages for the target operating systems and in general is meant to be easier to install and use while delivering optimal performance.