Re: Signing a message with S/MIME in Gnus?

[Angel de Vicente <angel.vicente.garrido@gmail.com>]

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Hello,

Jens Lechtenboerger <jens.lechtenboerger@fsfe.org> writes:

> There is.  Before coming to that, please reconsider for what you
> ask: Alice sends a message to Bob, but the message is signed by
> Mallory.  What is Bob supposed to do with this?

Yes, I realized after I sent the message that this was going to be
confusing. I managed to do it by setting
'mml-secure-smime-sign-with-sender' to nil, so that I could then choose
the certificate, but Gmail (for example) complains about the mail
address in the certificate not being the same as the "From" address, so
probably not a good idea in general.

> IMO, the signature should really match the sender’s FROM address.
> Maybe you can ask your CA to include your other e-mail addresses as
> well?  Or switch to GnuPG for your other e-mail addresses, where you
> are in control and not some CA (which Bob probably does neither know
> nor trust anyways)?  See [1] for more information.

So, I was actually thinking of going for the second option: use SMIME
when I send from the address in the certificate, and use PGP when
sending from this gmail address. But now I need to figure out how to
tell Gnus to do that. Right now I have the following, which makes sure
that by default I will be always signing with SMIME. Do you know if
there is an easy way to set these depending on the "From" address?

,----
| (add-hook 'gnus-message-setup-hook 'mml-secure-message-sign-smime)
| (setq mml-secure-method "smime")
`----

Cheers,
-- 
Ángel de Vicente                 -- (GPG: 0x64D9FDAE7CD5E939)
 Research Software Engineer (Supercomputing and BigData)
 Instituto de Astrofísica de Canarias (https://www.iac.es/en)

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