Ophcrack is a free open source (GPL licensed) program that cracks Windows log-in passwords by using LM hashes through rainbow tables. The program includes the ability to import the hashes from a variety of formats, including dumping directly from the SAM files of Windows. On most computers, ophcrack can crack most passwords within a few minutes. Developed by Objectif Sécurité
License: Open Source
Ophcrack is a free tool primarily focused on recovering Windows passwords using rainbow tables, making it effective for various Windows versions, though it requires some technical knowledge. In contrast, Kon-Boot is a commercial software that allows users to bypass Windows passwords without recovery, offering a quick and straightforward solution but with potential compatibility limitations.