Decrypt given data previously encoded with rc2-40-cbc cipher algo. RC2 with a 40-bit key size in CBC (Cipher Block Chaining) mode, providing encryption by chaining together blocks. Used in environments with key-length restrictions, RC2-40-CBC offered some measure of security, though it was always considered weak. RC2-40-CBC is extremely insecure, vulnerable to modern cryptographic attacks, and should not be used. Our decryption process assumes the IV string is prepended in the encoded string during the encryption process. You can not decrypt and get the correct results if the IV or passphrase mismatch occurs between encryption and decryption process.