-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On 03/12/2013 03:46 PM, Daniel Kahn Gillmor wrote:
> Hi Enigmail folks--
> 
> The message i'm writing right now is not signed by me (please
> inspect the source to verify).  However, when viewed in enigmail, I
> believe it will have a "Good signature" header if you already have
> my key.

I do indeed already have your key. I'm not sure where from. Are you
involved with sks?
> 
> This is because i've attached another e-mail from me below, and
> that e-mail itself is signed.  that is, this message has a
> message/rfc822 subpart  that itself contains a PGP/MIME-signed
> message.

Confirmed.
> 
> Using the enigmail UI, i see no way to distinguish which part of
> the message is actually the signed part.

It certainly doesn't highlight that the attachment is signed rather
than the message body.
> 
> This seems to be a serious message verification/authenticity
> concern. If anyone is unclear on the risk and is willing to
> volunteer, i'd be willing to craft a bogus message to you from your
> own e-mail.  just send me a PGP/MIME-signed message, and i'll send
> you back a different message "from yourself" that appears to be
> signed by you.

I'm cc'ing you directly with this message. Let's play!

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2.0.19 (GNU/Linux)
Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/

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W9sY7mINLeqRUAdVLlkip8PNWIhW0ZDK8XcrXmOaWIUp6qFs7jL1P3BpdMGxeDzR
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HMi6zRD8U7VtFb9wLgKn
=Lx/5
-----END PGP SIGNATURE-----

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