PASSWORD CRACKING TOOL : CAIN AND ABEL

This is one of the top password recovery tools for windows. This Windows-only password recovery tool handles an enormous variety of tasks. It can recover passwords by sniffing the network, cracking encrypted passwords using Dictionary, Brute-Force and Cryptanalysis attacks, recording VoIP conversations, decoding scrambled passwords, revealing password boxes, uncovering cached passwords and analyzing routing protocols. 

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http://www.oxid.it/cain.html