On Wed, May 08, 2024 at 03:49:12PM +0200, Werner Koch wrote:
> Hi!
> 
> Thanks for the summary.  I fully agree add these 2 cents:

Thanks.

> In particular using a fixed subject is not going to work in any real
> business because you are not able to ignore mails.  For my part, I even
> use a auto-responder to tell that mails with a three-dot subject are
> ignored.

Indeed.

> There is a simpler method than autocrypt to initially convey a key.  If
> you can't MIME-attach it, include your key in the signature (gpg's
> --include-key-block).  This is what S/MIME does for decades.  If you
> don't have the recipient's key (i.e. no Web Key Directory), signing the
> first message allows the recipient to reply encrypted.

This is fine, though AFAICT it still suffers from the same problems as
autocrypt:  

 - trusting authentication data from an unknown/unverified source
 - MITM

[Arguably these are really the same problem.]

Probably fine for preventing casual eavesdropping, but for genuinely
sensitive applications, should not be considered good enough, unless
I'm missing some important detail...

-- 
Derek D. Martin    http://www.pizzashack.org/   GPG Key ID: 0xDFBEAD02
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