Decrypt given data previously encoded with rc2-ofb cipher algo. RC2 in OFB (Output Feedback) mode, turning the block cipher into a stream cipher with feedback. OFB mode was introduced to RC2 to handle streams of data more efficiently, though it does not eliminate RC2's inherent weaknesses. RC2-OFB is considered insecure and not recommended for modern applications. 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.