ctf-crypto

What it does

This skill equips AI agents to solve cryptographic challenges within Capture The Flag (CTF) competitions. It enables the agent to analyze encrypted data, identify cipher types, and apply appropriate decryption techniques to recover hidden flags.

When to use it

• You need assistance breaking classical ciphers like Caesar, Vigenère, or substitution ciphers found in CTF write-ups.
• Your agent is stuck on a challenge requiring frequency analysis or pattern recognition in encrypted text.
• You want the AI to automate the process of testing common encryption algorithms against provided ciphertexts.

Key capabilities

• Identifies and decodes various classical cryptographic ciphers.
• Performs frequency analysis to crack substitution-based encryptions.
• Extracts hidden flags from encrypted strings commonly used in CTF scenarios.

Example prompts

• "Analyze this ciphertext: 'Uif hooj gbsnf...' and determine the encryption method used."
• "Help me solve a Caesar cipher challenge where the shift amount is unknown."
• "Decrypt this string using frequency analysis techniques suitable for CTF competitions."

Tips & gotchas

Ensure you provide sufficient context or sample ciphertext, as classical ciphers often require specific input patterns to be solved accurately. This skill focuses on classical cryptography and may not handle modern asymmetric encryption without additional tools.