crack
Password guessing program (crypt() variant)
Platforms: Linux · Last verified September 6, 2026
Crack is program designed to quickly locate vulnerabilities in Unix (or other) password files by scanning the contents of a password file, looking for users who have misguidedly chosen a weak login password.
Only use this tool against systems you own or are explicitly authorized to test — see the disclaimer.
Getting started
See the official Kali tool page and upstream homepage linked above for installation and usage details.