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SKILL: Symmetric Cipher Attacks — Expert Cryptanalysis Playbook AI LOAD INSTRUCTION: Expert techniques for attacking symmetric encryption in CTF and authorized testing. Covers CBC padding oracle, CBC bit flipping, ECB detection and exploitation, stream cipher key reuse, LFSR/LCG state recovery, RC4 biases, and meet-in-the-middle attacks. Base models often confuse ECB and CBC attack strategies or fail to set up byte-at-a-time ECB decryption correctly. 0. RELATED ROUTING rsa-attack-techniques when symmetric key is protected by RSA hash-attack-techniques when HMAC or hash-based authentication is involved lattice-crypto-attacks for LCG/LFSR state recovery via lattice methods Advanced Reference Also load BLOCK_CIPHER_ATTACKS.md when you need: Detailed attack scripts with full Python implementations Step-by-step byte-at-a-time ECB walkthrough PadBuster usage and custom padding oracle scripts LCG/LFSR recovery implementation Quick attack selection
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