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 authenticati…