PGP/Inline

PGP/Inline (ou PGP/INLINE ou Inline PGP) est un jeu d'encodage pour le chiffrement et la signature d'e-mails à travers un système de chiffrement hybride. Les clients de messagerie qui gèrent ce standard[1] permettent de savoir si les en-têtes et/ou le contenu de l'e-mail ont été chiffrés ou signés avec PGP/GnuPG. PGP/Inline est spécifié dans le standard OpenPGP (RFC 4880 section 6.2).

Le nom PGP/Inline n'est pas standardisé. La manière de chiffrer ou de signer les e-mails n'est elle non plus pas standardisée. Il est cependant possible d'insérer manuellement un bloc chiffré par PGP dans le corps d'un e-mail que le destinataire devra extraire et déchiffrer manuellement. On peut donc combiner des pièces jointes non chiffrées à un message chiffré par la méthode PGP/Inline. Un inconvénient étant que le nom en clair des pièces jointes peut aider à casser le chiffrement du contenu du message.

Exemple d'e-mail chiffré

Return-Path: <[email protected]>
Delivered-To: [email protected]
Received: from mail.example.org (localhost [127.0.0.1])
       by mail.example.org.com (ExampleMailer) with ESMTP id 3D39B2AAA00
       for <[email protected]>; Mon, 17 Nov 2008 20:45:22 +0100 (CET)
Message-ID: <[email protected]>
Date: Mon, 17 Nov 2008 20:45:20 +0100
From: Emetteur <[email protected]>
User-Agent: ExampleMUA 1.0
MIME-Version: 1.0
To: Destinataire <[email protected]>
Subject: PGP/INLINE-Testmail
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 8bit

-----BEGIN PGP MESSAGE-----
Charset: ISO-8859-1
Version: GnuPG v1.5.0 (GNU/Hurd)

eM3IyLmXvKp7zVTTwEU6Sbws0mUqvi4XwqNTuBwcn/aNQe6lTj+u26Bd7+kmEH02
Lj0tgPsP6+4A5b7Rzbf/I08z12LUJjyVXw4M/rSzJkrcpLN24iB/IcT0g1+HdLJF
[...]
nGqQbYRqMi64GCZ+4m0cSvQaIF9WOhSQDXR4KndYSc8/jiV2D+Ru5JH8j8Zgih9R
fha90PPvd01OPhfrRs/Awt61AvOV9stlO9ZTqO/dozl33FMW
=xP1s
-----END PGP MESSAGE-----

Alternatives

Des alternatives existent pour chiffrer un e-mail. Parmi elles, on trouve PGP/MIME et S/MIME. Le format des e-mails chiffrés ou plus précisément de leurs pièces jointes est standardisé dans ces méthodes alternatives. Il est possible pour chacune de ces méthodes d'implémentation de chiffrer un message totalement, y compris les pièces jointes. Le déchiffrement du contenu d'un e-mail est donc difficile. S/MIME n'est pas compatible avec les méthodes de chiffrement basées sur OpenPGP (PGP/Inline et PGP/MIME).

Notes et références

(de) Cet article est partiellement ou en totalité issu de l’article de Wikipédia en allemand intitulé « PGP/INLINE » (voir la liste des auteurs).
  1. (en) Graham Todd (13-04-2004), « pgp/mime vs in-line pgp », gnupg-users (consulté le 14 mars 2016)

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