On Fri, Apr 16, 2004 at 01:22:32AM +0900, Kazu Yamamoto wrote:
From: David Shaw <dshaw(_at_)jabberwocky(_dot_)com>
Subject: "Yes, I can handle PGP/MIME"
Given all that, would there be some benefit in a standard way for a
user to advertise that he can handle PGP/MIME? Specifically, a
"features" subpacket bit to say "I can handle PGP/MIME".
Interesting.
Bue I have a simple question:
Suppose Alice delivered her public key which says I can't handle
PGP/MIME. Then Alice comes to be able to handle PGP/MIME. How can she
deliver her (new) public key which says I can hadle PGP/MIME,
obsoleting old one?
The same way she handles it if she changes her OpenPGP program to one
that can handle MDC, or has different ciphers, or changes her
expiration date. This is a standard thing in OpenPGP. All of the
various informational subpackets can be rewritten if their information
changes.
Section 5.2.3.3 says:
Since a self-signature contains important information about the
key's use, an implementation SHOULD allow the user to rewrite the
self-signature, and important information in it, such as
preferences and key expiration.
David