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. It works based on a time-memory trade-off using rainbow tables. This is a new variant of Hellman’s original trade-off, with better performance. It recovers 99.9% of alphanumeric passwords in seconds.

Features:

• Runs on Windows, Linux/Unix, Mac OS X, ...
• Cracks LM and NTLM hashes.
• Free tables available for Windows XP and Vista.
• Brute-force module for simple passwords.
• Audit mode and CSV export.
• Real-time graphs to analyze the passwords.
• LiveCD available to simplify the cracking.
• Loads hashes from encrypted SAM recovered from a Windows partition, Vista included.
• Free and open source software (GPL).