Hi Joshua--

On Tue 2015-02-10 10:18:56 -0500, Joshua Rogers wrote:

> I sent an example to somebody, and they forwarded the email back to
> me(as a ForwardedMessage.eml), and commented in the forward.
> When I sent the email, I signed it.
> When they forwarded the email back to me, despite not coming from me and
> only being in the ForwardedMessage.eml, I got: "Good signature from
> Joshua Rogers (Internot IT) <<removed>> "
> <removed> is the email my GPG key has in it.
>
> Is this normal behaviour?
> I assume this could be used to impersonate somebody...
>
> Screenshot attached to show what I mean.
>
> Please include me as CC on reply, as I'm not subscribed to this list.

I think this is an instance of:

  https://sourceforge.net/p/enigmail/bugs/362/

  "Spoofable signatures: a message with a pgp/mime subpart is indistinguishable 
from a message that is signed as a whole"

(the above link may not work properly right now, as it appears that
sourceforge is in some sort of disaster-recovery mode, and their site is
being redirected to cloudfront)

      --dkg

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