Steve Atkins wrote:
There are three basic outcomes with a message:
VALID SIGNATURE
INVALID SIGNATURE
NO SIGNATURE
No, there are four basic outcomes with a message. You omitted
UNVERIFIABLE SIGNATURE
which just happens to be the one that this thread is all about.
If it's not verifiable, it's not a signature. (The same applies
to "invalid signature", of course).
Probably Charles means "unverifiable == verifier doesn't know how
to check it (it could be valid or invalid otherwise)", and uses
"invalid" for "it's definitely wrong with the specified algorithm".
The folks supporting to list used algorithms in the SSP apparently
think that receivers could care about this nuance. And the folks
opposing that idea note that spammers would try to abuse this info.
Frank
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