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.
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.
That still would be easily defeated, they can just copy the signatures
That’s not how PKI works?
Unless you know how digital signatures work better than me
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.