Encrypt given data using 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 encryption process prepends the IV string used during the encryption process in the encrypted data so that it can be used during decryption.