Encrypt given data using aes-256-cfb8 cipher algo. AES with 256-bit key in CFB mode with a feedback size of 8 bits, offering byte-oriented encryption. Optimized for environments requiring encryption at the byte level, but not as widely used as CFB128. More secure than CFB1, but CFB128 or other AES modes are generally preferred. Our encryption process prepends the IV string used during the encryption process in the encrypted data so that it can be used during decryption.