this post was submitted on 23 Nov 2023
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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.
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.
If you've figured out how to do that, a lot of governments would pay you a lot of money for your solution