7 ms·

Galileo offers optional cryptographic signatures for their positioning data. It's a solved problem and free for use. https://www.gsc-europa.eu/sites/default/f

• michaelt 2y ago
  Sadly this doesn’t solve the problem. Spoofers simply receive the signed signal and re-broadcast it with a tiny delay. Signatures still intact.
  • brohee 2y ago
    If you ever received unspoofed data, and have a somewhat accurate local clock (rubidium is fairly cheap), you can detect the spoofing.