ctf-misc SKILL.md skillA

ctf-misc from ljagiello/ctf-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned

mdr add ljagiello/ctf-skills/ctf-misc@git:20261027.2388a3b

Pins git:20261027.2388a3b in mdr.lock. Pin the fingerprint instead.

Audit grade: A, 17 of 17 checks passed
Kind: SKILL.md skill
Repository: ljagiello/ctf-skills
Path: ctf-misc/SKILL.md
Versions recorded: 8
Latest version: git:20261027.2388a3b, committed Oct 27, 2026
First version recorded: Apr 3, 2026
Size: 28,420 bytes
Repository stars: 3,657
License: MIT

Provides miscellaneous CTF challenge techniques for problems that do not cleanly fit the main categories. Use for encoding puzzles, pyjails, bash jails, RF/SDR, DNS oddities, unicode tricks, esoteric languages, QR or audio puzzles, constraint solving, game theory, unusual sandbox escapes, and hybrid logic puzzles. Prefer a more specific skill first when the challenge is mainly web, pwn, reverse, forensics, malware, OSINT, or crypto. Treat this as the fallback skill for genuine cross-category…

Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.

What the file says

# CTF Miscellaneous

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

## Prerequisites

**Python packages (all platforms):**
```bash
pip install "pwntools==4.15.0" "segno==1.6.6" z3-solver Pillow numpy requests dnslib
```

**Linux (apt):**
```bash
apt install libzbar0 qrencode ffmpeg
```

**macOS (Homebrew):**
```bash
brew install ffmpeg qrencode
```

**Manual install:**
- SageMath — Linux: `apt install sagemath`, macOS: `brew install --cask sage`

## Additional Resources

- [pyjails.md](pyjails.md) - Python jail/sandbox escape techniques, quine context detection, restricted character repunit decomposition, func_globals module chain traversal, restricted charset number generation, class attribute persistence, f-string config injection via stored eval
- [bashjails.md](bashjails.md) - Bash jail/restricted shell escape techniques, HISTFILE file read trick, bash -v verbose mode, ctypes.sh direct C library calls
- [encodings.md](encodings.md) - Encodings, QR codes, esolangs, UTF-16 tricks, BCD encoding, multi-layer auto-decoding, indexed directory QR reassembly, multi-stage URL encoding chains
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint

mdr add ljagiello/ctf-skills/ctf-misc@sha256:9a8d25b6c945edd4

The line at the top of this page pins the label git:20261027.2388a3b, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.

Badge

[![mdr](https://markdownregistry.com/badge/art_pxkk7aoxynfz3cy2.svg)](https://markdownregistry.com/a/art_pxkk7aoxynfz3cy2)

3 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 8 versions of this file, between Apr 3, 2026 and Oct 27, 2026, about one every 30 days.

version	committed	commit	size	audit
git:20261027.2388a3b latest	2026-10-27	2388a3b	28,420 B	A	view · diff
git:20261019.9eeabd6	2026-10-19	9eeabd6	28,394 B	A	view · diff
git:20261015.0d99b9d	2026-10-15	0d99b9d	26,698 B	A	view · diff
git:20260912.61c2efe	2026-09-12	61c2efe	26,698 B	A	view · diff
git:20260417.b80ec3f	2026-04-17	b80ec3f	26,323 B	A	view · diff
git:20260414.2fddcde	2026-04-14	2fddcde	26,322 B	A	view · diff
git:20260404.e169175	2026-04-04	e169175	25,817 B	A	view · diff
git:20260403.008fb99	2026-04-03	008fb99	24,729 B	A	view

Audit of the latest version

A 17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.

pass: Frontmatter block present
pass: Frontmatter declares a name
pass: Frontmatter declares a description
pass: Size between 200 bytes and 200 KB (28420 bytes)
pass: No zero-width or bidi control characters
pass: No instruction hidden inside an HTML comment
pass: No link to an exfiltration or paste host
pass: No credential-shaped string
pass: No instruction to send local credentials anywhere
pass: No text hidden with inline styles
pass: No prompt-injection phrasing
pass: No curl or wget piped into a shell
pass: No recursive delete of root, home or parent
pass: No instruction to read or print local credentials
pass: No base64 blob over 200 characters
pass: No link to a raw IP address
pass: No script tag

Source

GitHub

ljagiello/ctf-skills · 3,657 stars · license MIT · pushed 2026-11-06 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_pxkk7aoxynfz3cy2
GET https://markdownregistry.com/api/v1/resolve?ref=ljagiello/ctf-skills/ctf-misc
GET https://markdownregistry.com/api/v1/blob/9a8d25b6c945edd4b318e5dd60a67fb6e7f820d9ed0ea30de6b418ffefe14f48

Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.

Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.

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