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fcrackzip

fcrackzip is a fast password cracker for zip archives using brute force or dictionary attacks. It optionally tests results with unzip and can crack cpmask'ed images.

Description

fcrackzip is a fast password cracker partly written in assembler, designed for cracking password protected zip files. It supports brute force or dictionary based attacks and can validate results using unzip. Additionally, it handles cpmask'ed images.

This package is particularly useful for pentesters, ethical hackers, and forensics experts who need to recover passwords from zip archives during security assessments or investigations.

The tool includes fcrackzip for cracking and fcrackzipinfo for displaying zip file information.

How It Works

fcrackzip uses optimized algorithms, partly in assembler, for brute force or dictionary attacks on zip passwords. Compiled methods include cpmask, zip1, and default zip2 with USE_MULT_TAB. It tests cracked passwords with unzip for validation.

Installation

bash
sudo apt install fcrackzip

Flags

-b|--brute-forceuse brute force algorithm
-D|--dictionaryuse a dictionary
-B|--benchmarkexecute a small benchmark
-c|--charset charactersetuse characters from charset
-h|--helpshow this message
--versionshow the version of this program
-V|--validatesanity-check the algorithm
-v|--verbosebe more verbose

Examples

Show help message for fcrackzip
fcrackzip -h
Use brute force algorithm to crack zip password
fcrackzip -b
Use dictionary attack to crack zip password
fcrackzip -D
Execute a small benchmark
fcrackzip -B
Use specified characterset for brute force cracking
fcrackzip -c charset file.zip
Run with verbose output
fcrackzip -v
Show help for fcrackzipinfo to display zip information
fcrackzipinfo --help
Display information about the zip file
fcrackzipinfo file.zip
Updated 2026-04-16kali.org ↗