#include <iostream>
#include <string>

using namespace std;

int main()
{
  // Define the key to use for the XOR operation
  string key = "mysecretkey";

  // Define the original message to be encrypted
  string message = "Hello, world!";

  // Convert the key and message to binary format
  string binary_key = key;
  string binary_message = message;

  // Perform the XOR operation on the binary message using the binary key
  string ciphertext = "";
  for (int i = 0; i < binary_message.length(); i++)
  {
    ciphertext += binary_message[i] ^ binary_key[i % binary_key.length()];
  }

  // Print the resulting ciphertext
  cout << ciphertext << endl;

  return 0;
}