# Fcrackzip

> Auth/lab ref: ZIP password-cracking utility for dictionary and brute-force testing. For you need a focused CLI workflow against password-protected ZIP archives before escalating to heavier cracking stacks.

- Skill: `aeondave/fcrackzip` (Agent Skill)
- Install (CLI): `npx skillmds@latest add aeondave/fcrackzip`
- Raw SKILL.md: https://api.skillmd.com/api/skills/aeondave/fcrackzip/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Productivity
- Author: AeonDave (https://skillmd.com/u/aeondave)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/aeondave/fcrackzip

---


# fcrackzip

Specialist ZIP password cracking with less ceremony than the bigger frameworks.

## When to use fcrackzip

Use fcrackzip when you need to:

- test a ZIP archive against a wordlist quickly
- brute-force a narrow password space for ZIP only
- verify whether a known candidate password opens the archive

## Quick Start

```bash
# Dictionary attack and verify extraction
fcrackzip -D -p rockyou.txt -u archive.zip

# Brute-force simple character sets
fcrackzip -b -c 1aA -l 1-8 -u archive.zip
```

## Practical Notes

- `-u` verifies the password against unzip logic instead of only reporting a guess.
- Start with a dictionary attack unless you have strong evidence the keyspace is tiny.
- If the archive source is known, build targeted masks before going full brute force.

## Caveats

- ZIP-only specialization is its strength and its boundary.
- Brute force becomes painful fast; switch to better-targeted tooling when entropy rises.
- Some workflows are better served by `john` or `hashcat` once you extract the relevant hash material.

## Resources

No bundled `scripts/`, `references/`, or `assets/`.
Use the local man page for charset syntax and mode details.