What I loved about SPKI/SDSI was the idea of namespaces and namespace
chaining. "The key that Alice nicknamed 'Bob's key'" is unambiguous and
implementable. Once I've named a key, a computer can track that name
across multiple different identifiers effortlessly. Once I tell the
computer that *this specific key* represents "Alice from the Home
Office," Alice can use any address--indeed, any protocol that allows her
to sign messages--and my computer can tell me it's Alice from the Home
Office.
I agree, that's about the best we can hope for. Too bad nobody does that.
Regards,
John Levine, johnl(_at_)taugh(_dot_)com, Taughannock Networks, Trumansburg NY
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