Encrypt given data using camellia-256-cfb cipher algo. Camellia in 256-bit key size with CFB mode, providing secure stream encryption for variable-length data. Developed to offer flexible encryption schemes, Camellia in 256-bit mode with CFB is part of the Camellia family's suite of secure modes. Camellia-256-CFB is highly secure and offers robust protection against modern cryptographic attacks. Our encryption process prepends the IV string used during the encryption process in the encrypted data so that it can be used during decryption.