Breaks cryptographic systems and decrypts ciphertext. Use when working with RSA, AES, XOR, classical ciphers, hash functions, or when challenge involves encryption, decryption, keys, or mathematical crypto attacks.
Install
npx skills add kiwamizamurai/cctf --skill crypto-analysisnpx skills add kiwamizamurai/cctf --skill crypto-analysis -a claude-code -gnpx skills add kiwamizamurai/cctf --skill crypto-analysis -a codex -ggemini skills install https://github.com/kiwamizamurai/cctf.git --path .claude/skills/crypto-analysisgh skill install kiwamizamurai/cctf crypto-analysisgit clone --depth 1 https://github.com/kiwamizamurai/cctf /tmp/kiwamizamurai__cctf
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/kiwamizamurai__cctf/.claude/skills/crypto-analysis ~/.claude/skills/crypto-analysis # Claude Code
cp -R /tmp/kiwamizamurai__cctf/.claude/skills/crypto-analysis ~/.agents/skills/crypto-analysis # Codex, Cursor, Gemini CLI, Copilot, OpenCode