Let's boot up and get hacking! Where Linux Passwords Are Stored Linux passwords are stored in the /etc/passwd file in cleartext in older systems and in /etc/shadow file in hash form on newer systems. We should expect that the passwords on anything other than old legacy systems to be stored in /etc/shadow. Step 1: Create Some User Accounts Since our BackTrack system probably doesn't have many users on it other than our root account, let's go ahead and create a couple more accounts. Let's create user1 with password ' flower' and user2 with a password of ' hacker'. I've purposely chosen dictionary words as the complexity of the password is inversely related to the time necessary to crack it.

One of the nice features of John the Ripper is that it will try to use a dictionary attack first. If that fails, it will try a hybrid attack. And only if that fails will it attempt a brute-force attack, which is the most time consuming. Step 2: Open John the Ripper Now that we have a couple of regular users in our system with simple passwords, we now need to open John the Ripper. John the Ripper is a simple, but powerful password cracker without a GUI (this helps to make it faster as GUIs consume resources). We can access it from BackTrack by going to the BackTrack button on the bottom left, then Backtrack, Privilege Escalation, Password Attacks, Offline Attacks, and finally select John the Ripper from the multiple password cracking tools available.

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