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