ctf-crypto
ctf crypto
What it does
- SageMath — Linux: apt install sagemath, macOS: brew install --cask sage
- RsaCtfTool — git clone https://github.com/RsaCtfTool/RsaCtfTool (automated RSA attacks)
- historical.md - Historical ciphers (Lorenz SZ40/42, book cipher implementation)
- If the real blocker is understanding a binary, obfuscated client, or weird VM, switch to /ctf-reverse.
- If the challenge is mostly packet carving, disk recovery, or stego extraction before any decryption starts, switch to /ctf-forensics.
- If the task is just implementing an exploit against a vulnerable network service after the crypto part is solved, switch to /ctf-pwn or /ctf-web.
- If the crypto challenge involves adversarial ML, model extraction, or neural-network-based ciphers, switch to /ctf-ai-ml.
Requirements & configuration
- Note: gmpy2 requires libgmp — Linux: apt install libgmp-dev, macOS: brew install gmp.
Configuration: SHA256SHA1CRC32
Derived from the skill's own SKILL.md documentation · extracted 2026-07-23
ctf-crypto FAQ
What does the ctf-crypto skill do?
Provides cryptography attack techniques for CTF challenges. Use when attacking encryption, hashing, signatures, ZKP, PRNG, or mathematical crypto problems involving RSA, AES, ECC, lattices, LWE, CVP, number theory, Coppersmith, Pollard, Wiener, padding oracle, GCM, key derivation, or stream/block cipher weaknesses. SageMath — Linux: apt install sagemath, macOS: brew install --cask sage RsaCtfTool — git clone https://github.com/RsaCtfTool/RsaCtfTool (automated RSA attacks)
What does ctf-crypto require?
Note: gmpy2 requires libgmp — Linux: apt install libgmp-dev, macOS: brew install gmp. Configuration keys: SHA256, SHA1, CRC32.
How do I install ctf-crypto?
Run: npx -y skills add https://github.com/ljagiello/ctf-skills --skill ctf-crypto --agent claude-code — the source lives at github.com/ljagiello/ctf-skills.
Maintain ctf-crypto?
Let people know it's listed here — add the badge (live metrics, light/dark aware) or a plain link to your README or docs.
[](https://getagentictools.com/skills/ljagiello-ctf-skills-ctf-crypto?ref=badge) npx agentictools info skills/ljagiello-ctf-skills-ctf-crypto The second line is the CLI lookup for this page — handy in READMEs and docs.
