Decrypt given data previously encoded with aes-256-ofb cipher algo. AES with 256-bit key in OFB (Output Feedback) mode, which turns a block cipher into a stream cipher. OFB mode was developed to address some weaknesses of ECB mode by making encryption dependent on previous outputs. Secure but vulnerable to bit-flipping attacks. Rarely used today. 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.