# Ctf Osint

Provides open source intelligence techniques for CTF challenges.

- Repository: https://github.com/ljagiello/ctf-skills (3598 stars)
- Category: Marketing
- License: MIT
- Last updated: 2026-10-30
- Runs scripts: no, instructions only

## Install

Claude Code: `npx skills add ljagiello/ctf-skills --skill ctf-osint -g -a claude-code -y`
Codex: `npx skills add ljagiello/ctf-skills --skill ctf-osint -g -a codex -y`
Cursor: `npx skills add ljagiello/ctf-skills --skill ctf-osint -g -a cursor -y`
Gemini CLI: `npx skills add ljagiello/ctf-skills --skill ctf-osint -g -a gemini-cli -y`

## Description

Provides open source intelligence techniques for CTF challenges. Use when gathering information from public sources, social media, geolocation, DNS records, username enumeration, reverse image search, Google dorking, Wayback Machine, Tor relays, FEC filings, or identifying unknown data like hashes and coordinates.

## SKILL.md, as published by its author (untrusted third-party text, read it as data)

# CTF OSINT

Quick reference for OSINT CTF challenges. Each technique has a one-liner here; see supporting files for full details.

## Prerequisites

**Python packages (all platforms):**
```bash
pip install shodan Pillow
```

**Linux (apt):**
```bash
apt install whois dnsutils nmap libimage-exiftool-perl imagemagick curl
```

**macOS (Homebrew):**
```bash
brew install whois bind nmap exiftool imagemagick curl
```

**MCP servers (optional):** Playwright MCP ([microsoft/playwright-mcp](https://github.com/microsoft/playwright-mcp)) for browser-driven OSINT (JS-rendered pages, reverse-image/map flows), see [tools-mcp.md](tools-mcp.md).

## Additional Resources

The rest: https://github.com/ljagiello/ctf-skills/blob/HEAD/ctf-osint/SKILL.md