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ctf-crypto

ljagiello · Сигурност

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.

Оригинален текст · няма потвърден превод на български
Платформи: ClaudeНиво: НапредналоВ индекса: 11.06.2026 г.Обновен в GitHub: 13.09.2026 г.

Теми: agent-skills · claude-code · claude-code-skills · codex · codex-cli · ctf · ctf-challenges · ctf-tools · gemini · gemini-cli · opencode · security

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MIT
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22.09.2026 г.

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CTF Cryptography

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

Prerequisites

Python packages (all platforms):

pip install pycryptodome z3-solver sympy gmpy2 hashpumpy fpylll py_ecc
# Coppersmith (optional): pip install coppersmith
# Alternative Coppersmith lib: git clone https://github.com/jvdsn/crypto-attacks ~/.ctf-tools/crypto-attacks && pip install -r ~/.ctf-tools/crypto-attacks/requirements.txt

Linux (apt):

apt install hashcat

macOS (Homebrew):

brew install hashcat

Manual install:

  • SageMath (optional — only for legacy Sage fallback snippets (collapsed sections)) — Linux: apt install sagemath, macOS: brew install --cask sage
  • RsaCtfTool — git clone https://github.com/RsaCtfTool/RsaCtfTool (automated RSA attacks)
  • crypto-attacks (Coppersmith) — git clone https://github.com/jvdsn/crypto-attacks ~/.ctf-tools/crypto-attacks + pip install -r ~/.ctf-tools/crypto-attacks/requirements.txt (alternative to pip install coppersmith)

Note: gmpy2 requires libgmp — Linux: apt install libgmp-dev, macOS: brew install gmp.

Additional Resources

  • classic-ciphers.md - Classic ciphers: Vigenere (+ Kasiski examination), Atbash, substitution wheels, XOR variants (+ multi-byte frequency analysis), deterministic OTP, cascade XOR, book cipher, OTP key reuse / many-time pad, variable-length homophonic substitution, grid permutation cipher keyspace reduction, image-based Caesar shift ciphers, XOR key recovery via file format headers
  • modern-ciphers.md - Modern cipher attacks: AES (CFB-8, ECB leakage), CBC-MAC/OFB-MAC, padding oracle, S-box collisions, GF(2) elimination, LCG partial output recovery, affine cipher over composite modulus, AES-GCM with derived keys, AES-GCM nonce reuse (forbidden attack), Ascon-like reduced-round differential cryptanalysis, custom linear MAC forgery, CBC padding oracle (full block decryption), Bleichenbacher RSA PKCS#1 v1.5 padding oracle (ROBOT), birthday attack / meet-in-the-middle, CRC32 collision signature forgery, AES key recovery via byte-by-byte zeroing oracle, AES-CBC ciphertext forging via error-message decryption oracle
  • modern-ciphers-2.md - Modern cipher attacks (Part 2): Blum-Goldwasser bit-extension oracle, hash length extension, compression oracle (CRIME-style), hash function time reversal via

Целият SKILL.md в GitHub