Encrypt given data using camellia-192-ofb cipher algo. Camellia in 192-bit key size with OFB mode, a secure mode that turns the block cipher into a stream cipher. OFB mode was designed to address the weaknesses of ECB while retaining the benefits of block ciphers. OFB is secure but may still suffer from error propagation and key reuse vulnerabilities. Our encryption process prepends the IV string used during the encryption process in the encrypted data so that it can be used during decryption.