4 ms·

Galileo offers cryptographic protection (OSNMA) of their positioning data. So not spoofable. For free.

• evanjrowley 2y ago
  Link for reference: https://www.gsc-europa.eu/galileo/services/galileo-open-service-navigation-message-authentication-osnma https://www.gsc-europa.eu/galileo/services/galileo-open-serv... Recent news: https://www.euspa.europa.eu/newsroom-events/news/galileo-getting-ready-upcoming-osnma https://www.euspa.europa.eu/newsroom-events/news/galileo-get...
• toomuchtodo 2y ago
  Any insight as to why newer GPS satellites do not offer similar capabilities?
  • bean-weevil 2y ago
    The GPS project began in 1973. Digital signatures were invented in 1976. I'm guessing adding it on after the fact would have been very expensive.
    • toomuchtodo 2y ago
      There have been progressive improvements as new satellites are brought into service, and those end of life retired. Perhaps backwards compatibility? https://en.wikipedia.org/wiki/GPS_signals#Legacy_GPS_signals https://en.wikipedia.org/wiki/GPS_signals#Legacy_GPS_signals https://en.wikipedia.org/wiki/GPS_signals#Modernization_and_additional_GPS_signals https://en.wikipedia.org/wiki/GPS_signals#Modernization_and_...
• lxgr 2y ago
  Not quite unspoofable, at least once the signal has been received for time-delayed rebroadcasting/meaconing. But spoofing does become detectable by any receiver with a sufficiently accurate clock (I think for complete protection it would have to be an atomic clock though).