[Cryptography] improved identification of non-targets

[james hughes]

> On Jan 11, 2020, at 10:13 PM, John Denker via cryptography <cryptography at metzdowd.com> wrote:
> 
> 6) Layering some crypto on that shouldn't be toooo hard.
> The aircraft can perform some sort of public-key signature
> or zero-knowledge proof of identity.  Append the nonce to
> your claimed ID, sign it, and send it back.

And we will have the same PKI mess we have today, as a result unfriendly will now have cryptographically signed beacons of a friendly or neutral. 
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