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From: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
To: notmuch@notmuchmail.org
Subject: Re: Inline-encryption, encryption failure when storing sent mails
Date: Tue, 18 Feb 2014 13:31:58 -0500	[thread overview]
Message-ID: <87lhx8w9up.fsf@alice.fifthhorseman.net> (raw)
In-Reply-To: <5213A15F.30109@fifthhorseman.net>

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On Tue 2013-08-20 13:03:27 -0400, Daniel Kahn Gillmor wrote:
> I've been meaning to write this up more cleanly, but a summary here will
> have to do for now:
>
> The MIME Content-Type header for an inline-PGP-signed e-mail message is
> not signed.  This means that an attacker can replay a signed message
> while undetectably changing the Content-Type.  One example of such an
> attack is to leave the base Content-Type as text/plain but to switch
> charsets -- the same bytestream can then be interpreted differently.

I've finally written this up, with a demonstration.  I'm hosting it here
for now:

   https://dkg.fifthhorseman.net/notes/pgp-inline-harmful/

i hope this is useful for future discussions about inline PGP.

Please let me know if you see any problems with the text or if you have
any questions.

   --dkg

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      reply	other threads:[~2014-02-18 18:32 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-08-12 16:57 Inline-encryption, encryption failure when storing sent mails Simon Hirscher
2013-08-16  8:02 ` David Bremner
2013-08-16 11:32   ` Simon Hirscher
2013-08-20 17:03   ` Daniel Kahn Gillmor
2014-02-18 18:31     ` Daniel Kahn Gillmor [this message]

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