Commercial Flights Are Experiencing ‘Unthinkable’ GPS Attacks and Nobody Knows What to Do::New “spoofing” attacks resulting in total navigation failure have been occurring above the Middle East for months, which is “highly significant” for airline safety.
The problem is with the way GPS works. Your device gets telemetry from the satellites. A fake signal can screw up the whole system.
But if they had authentication you would know that the message doesn’t come from a legitimate satélite.
you can’t have authentication in a one way system. satellites send days, planes receive it, but never send anything.
You can have a digital signature, so the recievers know it’s legit
yes of course, but that isn’t authentication.
Playing with semantics a little, it can be thought of as the satellite authenticating with the client using the signature as password.
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If you’ve figured out how to do that, a lot of governments would pay you a lot of money for your solution
You can’t copy a signature, since it is different every time the signed content is different. You need to have the correct key in order to make a valid signature.