Cracking Unix Password Hashes with John the Ripper (JTR)

Introduction

This post will serve as an introduction to password cracking, and show how to use the popular tool John-the-Ripper (JTR) to crack standard Unix password hashes. I am also working on a follow-up post that will provide a far more comprehensive look at password cracking techniques as well as the different tools employed (as well as their pros/cons).

Brute Force Without a Dictionary Using John The Ripper

If you’re like me (Lance), and playing with, using professionally, or writing list requiring brute-forcing software. You don’t want to waste the hard drive space for massive all-encompassing password lists which have a limited chance of success. Luckily you don’t have to do that at all leveraging some john the ripper and (l/u)nix functionality.