On Mon, 9 Mar 2015, Patrick Ben Koetter wrote:
while thinking about OPENPGPKEY and SMIMEA I came across this question:
What if a recipient publishes both, an OPENPGPKEY and a SMIMEA RR in DNS and
what if a sender (MUA/MTA Filter) is capable to encrypt messages for both
standars S/MIME and PGP.
Which should the sender prefer? Could the receiver indicate a preference?
Has there been any discussion on this? Should there be? Did it take place and
I missed it?
It has not been discussed.
I would think this is a local policy decision. Likely, if respondering
to an encrypted message using X, one would encrypt back using X if the
local policy allows this. If sending a message from scratch, I would
think local policy applies?
An email client could prompt the user. An MTA would have to make a
decision on its own, based on its policy.
I wouldn't go so far as to allow the recipient to show a preference. The
recipient shows its accepted methods by publishing the related record in
DNS. This works similar to crypto suite/algo negotiations. The initiator
can pick its favourite from the intersection of what both parties
support.
Paul
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