Description: 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.
Features:
» Runs on Windows, Linux/Unix, Mac OS X, ...
» Cracks LM and NTLM hashes.
» Free tables available for Windows XP and Vista/7.
» Brute-force module for simple passwords.
» Audit mode and CSV export.
» Real-time graphs to analyze the passwords.
» LiveCD available to simplify the cracking.
» Dumps and loads hashes from encrypted SAM recovered from a Windows partition.
» Free and open source software (GPL).
A rainbow table is a precomputed table for reversing cryptographic hash functions, usually for cracking password hashes. Tables are usually used in recovering the plaintext password, up to a certain length consisting of a limited set of characters. It is a form of time-memory tradeoff, using less CPU at the cost of more storage. Proper key derivation functions employ a salt to make this attack infeasible.
Tags: Ophcrack , Rainbow_Tables , tool ,
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the largest rainbow tables ever generated is of size 864 GB
its huge.
http://project-rainbowcrack.com/