Ophcrack is a Windows password cracker based on rainbow tables. It comes with Graphical User Interface and runs on Windows, Mac OS X (Intel CPU) as well as on Linux.
After you download and burn the Live CD, the gallery below will walk you through every simple step in the process.
Restart your computer and reboot from the Ophcrack Live CD. You should see a loading screen like the one above.
I've set up three accounts to test with Ophcrack. One account uses a very simple password, "easypass". The other uses a password created by the Strong Password Generator, and the third is a password over 14 characters long.
Once Ophcrack finishes booting up (it may seem like it's stuck at first - it's not, so be patient), you'll see a list of all of the accounts on your PC. Click on Launch to get crackin'. The accounts we're concerned with are the ones labeled adam (the simple password), adam-medium (the strong password), and adam-15chars (the over 14 character password). As you can see, the 15-character password doesn't even show up in Ophcrack - meaning that if you want to secure yourself from this specific tool, you'll be totally safe if your password is over 14 characters.
As Ophcrack starts working, you'll see several strange letter combinations appearing in the LMpasswd1 and LMpasswd2 fields as Ophcrack works its magic.
After about 5 minutes or so, Ophcrack had cracked adam's simple password, "easypass". I've used Ophcrack on a stronger 13-character alphanumeric password and found it to crack it almost as quickly. So far the strong, generated password remains uncracked.
After about 30 minutes, Ophcrack had finished its cracking attempts. It had no success cracking the strong password generated for adam-medium by the Strong Password Generator.
Edited by Ultimate John, 15 April 2007 - 05:17 PM.