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[liberationtech] Cryptography Leak in Enigmail / GnuPG

coderman coderman at
Mon Nov 25 15:43:55 PST 2013

On Sun, Nov 24, 2013 at 9:26 AM, Moritz Bartl <moritz at> wrote:
> ...
> Important to note here is that by default, Enigmail adds the sender to
> the recipient list -- which is useful if you want to reread sent mail,
> but it also means that any encrypted mail contains not only the
> recipient key ID (which at least some users know), but also the sender
> key ID.
> Adding to the pain, if you receive a PGP message without keyID and have
> multiple private keys, GPG/Enigmail will dumbly rotate through the keys,
> without taking the actual email addresses (sender/recipient pair) from
> the mail header into account. This can only be solved on Enigmail-level,
> since only Enigmail "knows" about email headers.
> Thank you Fabio for filing the tickets! Maybe some good will come out of
> that.

email for private communication is folly, nevertheless,

it would be useful to use these fields for mis-information.  e.g.
"camouflage".  by inserting incorrect software in "BEGIN PGP MESSAGE",
by inserting a different version in "X-EnigMail-Version" or "Version:
and Comment: headers".

similar to the "Windows XP" mode of Tails, this camouflage would serve
to mislead potential attackers who would use this information for
targeted client side attacks.

best regards,

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