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Ophcrack-3.2.0 screenshot.png
Developer(s) Cedric Tissieres
Philippe Oechslin
Objectif Sécurité
Stable release 3.3.1 / 2009-7-29; 5 months ago
Operating system Microsoft Windows, Linux, Mac OS X
Type Password cracking
License GNU General Public License

Ophcrack is an open source (GPL licensed) program that cracks Windows 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. It is claimed that these tables can crack 99.9% of alphanumeric passwords of up to 14 characters in usually a few minutes.[1]

Rainbow tables for LM hashes of alphanumeric passwords are provided for free by the developers. Larger rainbow tables (for LM hashes of passwords with all printable characters, including symbols and space) are available for purchase from Objectif Sécurité. There is also a Live CD version which automates the retrieval, decryption, and cracking of passwords from a Windows system.

Starting with version 2.3, Ophcrack also cracks NTLM hashes. This is necessary if the generation of the LM hash is disabled (this is default for Windows Vista), or if the password is longer than 14 characters (in which case the LM hash is not stored).



Ophcrack can be pronounced "off-crack", "oaf-crack", or "o-p-h-crack".

See also


  1. ^ "OPH Reviews"

External links

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