Encrypt given data using aes-256-cfb cipher algo. AES with 256-bit key in Cipher Feedback (CFB) mode, enabling stream encryption with self-synchronizing properties. Designed for efficient streaming encryption while retaining block cipher security properties. Secure with proper IV use, but not as commonly used as GCM or CTR in modern implementations. Our encryption process prepends the IV string used during the encryption process in the encrypted data so that it can be used during decryption.