Encrypt given data using rc2-40 cipher algo. RC2 with a 40-bit key size, offering very weak encryption and typically used in environments with strict export restrictions. RC2-40 was used in countries where strong encryption was restricted, providing weak encryption to comply with export controls. RC2-40 is extremely insecure and should not be used in any modern applications due to its vulnerability to brute-force attacks. Our encryption process prepends the IV string used during the encryption process in the encrypted data so that it can be used during decryption.