[149221] in cryptography@c2.net mail archive
Re: [Cryptography] Does PGP use sign-then-encrypt or
daemon@ATHENA.MIT.EDU (James A. Donald)
Sat Jan 25 21:44:43 2014
X-Original-To: cryptography@metzdowd.com
Date: Sun, 26 Jan 2014 08:54:54 +1000
From: "James A. Donald" <jamesd@echeque.com>
To: cryptography@metzdowd.com
In-Reply-To: <lc0qrk$j75$1@ger.gmane.org>
Reply-To: jamesd@echeque.com
Errors-To: cryptography-bounces+crypto.discuss=bloom-picayune.mit.edu@metzdowd.com
On 2014-01-26 03:05, Yuriy Kaminskiy wrote:
> Does not work with *more than two participants* (Alice, Bob and Charlie know
> shared secret and thus can generate and validate MAC; who was author of message,
> Alice or Charlie?).
If small number of participants sharing encrypted messages, they trust
each other. They are worried about messages being altered by outsiders.
If one of their shared messages leaks, the fact that outsiders cannot
tell which of them originated it is a feature, not a bug.
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