L0phtCrack is a password auditing and recovery application originally produced by Mudge from L0pht Heavy Industries.

[5] Symantec later stopped selling this tool to new customers, citing US Government export regulations, and discontinued support in December 2006.

[3][6] In January 2009, L0phtCrack was acquired by the original authors Zatko, Wysopal, and Rioux from Symantec.

On July 1, 2021 L0pht Holdings, LLC repossessed L0phtCrack after Terahash defaulted on its instalment sale loan.

[12] On October 17, 2021 L0phtCrack version 7.2.0 was released open-source, with different portions of the software being published under different licenses.