Decrypt given data previously encoded with aes-256-cfb1 cipher algo. AES with 256-bit key in CFB mode with a feedback size of 1 bit, suitable for encrypting bit-level data. A specialized variant of AES-CFB, rarely used in modern cryptographic applications. Considered inefficient and vulnerable compared to other AES modes. 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.