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On 03/15/2014 10:10 AM, Patrick Brunschwig wrote:
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> 
> On 15.03.14 16:41, Egbert van der Wal wrote:
>> 
>> I recently set up my mailserver to use DKIM signing and I think 
>> the solution for embedding the DKIM signature is really elegant: 
>> adding a DKIM-Signature header. Since mail clients that do not 
>> understand this header just ignore it, it is basically invisible
>> to people inexperienced with mail and/or DKIM. It is still
>> embedded in the message. I then started looking for any
>> possibilities to use this and came across someone who wrote about
>> this same idea:
>> 
>> http://beza1e1.tuxen.de/articles/pgp_header.html

It is important to be clear about the nature of the problem so as to
address it properly. The problem is part social and part technical.

First, as to the social, I have been signing my emails for many years
now, and I find some people are disturbed when they can't do anything
with the attachment. I explain, sometimes they don't understand, but
the important thing for them is to just ignore the attachment, and
eventually they get that. Life goes on.

Next is the technical. This divides into two problems. First is that
the current methods of signing have been in use for quite a long
period of time. Enigmail is far from the only piece of software
involved. Compatibility is an issue. But I believe this is what the
RFC process is for.

The other issue is the question of what to sign/encrypt. I'm not
seeing this as a problem. Just sign/encrypt the entire body, including
attachments and leave it to the sender, as we already have been doing
for years, to make obvious which bits are from previous messages. This
does seem to me to be 'clean' and 'elegant'. It also seems to me that
it would address another problem previously reported on this list in
which a signed attachment could lead a receiver to believe that the
entire message had been signed.

It's important to remember here what a signature is supposed to mean:
strictly that I sent this. It means nothing more. And it strikes me
that the practice of encrypting pieces of a message and leaving other
pieces unencrypted is dubious, that leaving portions unencrypted might
offer clues as to the encrypted content.

- -- 
David Benfell
see https://parts-unknown.org/node/2 if you don't understand the
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