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.
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That’s not how PKI works?
Unless you know how digital signatures work better than me
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.