What is l0phtcrack?

L0phtCrack 7 is a password auditing and recovery tool, software that security professionals use to test how strong the passwords are on a system by attempting to "crack" (reverse-engineer) password hashes (scrambled representations of passwords stored by operating systems). This is a community fork, meaning an independently maintained version of the original L0phtCrack 7 project, which was a well-known Windows-only tool that is no longer actively maintained. The key change in this fork is replacing the original cracking engine with hashcat, a widely used password recovery tool that can use your computer's GPU (graphics card) to dramatically speed up the cracking process. On macOS, it uses Apple Metal for GPU acceleration, on Linux and Windows it uses OpenCL or CUDA. This lets the tool crack many more passwords much faster than the original. The fork also adds a "Finalyze" technique, which takes already-discovered passwords and tries variations of them to find even more, plus a statistics section showing crack rates, most common passwords found, and complexity analysis. Currently, the fork fully supports macOS 13 and later on Apple Silicon chips (M1 through M4) and Linux on ARM64 processors. Windows and Linux x86-64 support are in progress. You can either download a pre-built release or build it from source using the provided instructions. The project is written in C++ and uses the Qt framework for its graphical interface. This tool is intended for authorized security testing only, meaning you should only use it on systems and accounts you own or have explicit written permission to test.