After very hard working for two days, the FAST AES UDF finally here. These functions use the embedding DLL technique and the codes are almost all written in low-level language, so it is PURE SCRIPT but run very fast. For general user, the interface is quite simple: ; To encrypt/decrypt memory block or string: $Encrypted = _AesEncrypt("Key", "Plantext") $Decrypted = _AesDecrypt("Key", $Encrypted) $Result = BinaryToString($Decrypted) ; To encrypt/decrypt file _AesEncryptFile("Key", $PlantextFi