final byte[] associatedData = transformHeader.getAssociatedData();

            // Perform encryption based on cipher type
            EncryptionResult encResult =
                    isGCMCipher() ? encryptWithGCM(message, nonce, associatedData) : encryptWithCCM(message, nonce, associatedData);

            // Set authentication tag in transform header
            transformHeader.setSignature(encResult.authTag);