L0phtCrack is a password auditing and recovery application (now called LC5), originally produced by Mudge from LOpht Heavy Industries. It is used to test password strength and sometimes to recover lost Microsoft Windows passwords, by using dictionary, brute-force, and hybrid attacks. It was one of the crackers tools of choice, although most use old versions because of its price and low availability.

The application was produced by @stake after the LOpht merged with @stake in 2000. @stake was then acquired by Symantec in 2004. Symantec has since stopped selling this tool to new customers citing US Government export regulations, and discontinued support in December 2006. LC5 can still be downloaded from unofficial mirrors.

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