john
Active password cracking tool
Matches ATT&CK tactic: Credential Access ↗
Toolpassword-crackingcredential-accessredLinuxKali LinuxPlatforms: Linux · Last verified September 6, 2026
John the Ripper is a tool designed to help systems administrators to find weak (easy to guess or crack through brute force) passwords, and even automatically mail users warning them about it, if it is desired.
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.
