John the Ripper

CPU password cracker — hundreds of hash formats, wordlist + rules + incremental.

Quick Start

# Auto-detect format and crack
john hashes.txt --wordlist=/usr/share/wordlists/rockyou.txt

# Show cracked passwords
john hashes.txt --show

# Single crack mode (fast, username-based)
john hashes.txt --single

# Incremental (brute-force)
john hashes.txt --incremental