I think Ned's words are well chosen. And it is important to separate
the two functions. If all we wanted was integrity protection of the
message we have well defined mechanisms today (PGP and S/MIME come
immediately to mind).
However, I could understand the source of some confusion. It is useful
to provide some level of protection of the body of a message so that a
bad guy simply can't replace a legitimate body with a bogus one and
replay the message. The protection offered must survive mailing list
software without requiring such software to fork lift upgrade (which
ain't happening).
Eliot
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