
Ophcrack is a free Windows password cracker based on rainbow tables. It is a very efficient implementation of rainbow tables done by the inventors of the method. It comes with a Graphical User Interface and runs on multiple platforms.
I have tested it and it cracked my windows Xp password in few minutes. I never knew that it was so easy to break the windows Xp password.
However if you want to safeguard your system against Ophcrack you can make your password longer than 14 characters and then Ophcrack will not be able to break your system passwords.
Download a copy of Ophcrack from here.
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