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[liberationtech] Cryptography Leak in Enigmail / GnuPG

Fabio Pietrosanti (naif) lists at
Sun Nov 24 05:19:05 PST 2013

I just wanted to notice that the mostly used encryption software like
GnuPG and Enigmail, have some privacy leak that in the XKEYSCORE's ages
could represent a major risk.

a) Enigmail, Thunderbird's PGP plugin, does send "X-Enigmail-Version:"
header on ALL email sent, also the unencrypted one.

b) GnuPG, following the " -----BEGIN PGP MESSAGE-----", does add version
information such as " Version: GnuPG/MacGPG2 v2.0.19 (Darwin)" .

So, from a adversary perspective monitoring traffic encrypted with GnuPG
and Enigmail, those are extremely valuable information to plan and
prepare for and end-point attack, profiling the end-user target.

Are those pieces of information really needed to make the Enigmail /
GnuPG software working?

Fabio Pietrosanti (naif)
HERMES - Center for Transparency and Digital Human Rights - -

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