Decrypt given data previously encoded with rc2 cipher algo. RC2 (Rivest Cipher 2) is a symmetric-key block cipher that can use variable key lengths. RC2 was designed by Ron Rivest as a fast block cipher for use in software and became widely used in encryption software, especially for data protection. RC2 is considered insecure due to its short key length options and vulnerabilities to modern attacks. It is generally deprecated. 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.