Re: draft-ietf-openpgp-rfc2440bis-06.txt

Bodo Moeller <moeller@cdc.informatik.tu-darmstadt.de> Mon, 23 September 2002 14:08 UTC

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Date: Mon, 23 Sep 2002 16:01:02 +0200
From: Bodo Moeller <moeller@cdc.informatik.tu-darmstadt.de>
To: Derek Atkins <derek@ihtfp.com>
Cc: Jon Callas <jon@callas.org>, OpenPGP <ietf-openpgp@imc.org>
Subject: Re: draft-ietf-openpgp-rfc2440bis-06.txt
Message-ID: <20020923160102.A3035@cdc.informatik.tu-darmstadt.de>
References: <B9B3FFC0.9722%jon@callas.org> <20020923082334.A28473@cdc.informatik.tu-darmstadt.de> <sjm65wwyfnc.fsf@kikki.mit.edu>
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In-Reply-To: <sjm65wwyfnc.fsf@kikki.mit.edu>; from derek@ihtfp.com on Mon, Sep 23, 2002 at 09:55:19AM -0400
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On Mon, Sep 23, 2002 at 09:55:19AM -0400, Derek Atkins wrote:
> Bodo Moeller <moeller@cdc.informatik.tu-darmstadt.de>; writes:

>> Please point out an advantage of *key* expiration over
>> *self-signature* expiration in that scenario.

> A bad guy gets a copy of my private key..  If there is a key
> expiration then they cannot keep it alive indefinitely.

Yes he can -- this is exactly the problem [1] that I want to solve
with my suggested change to the specification.  The way Jon wants to
use key expiration, the bad guy can keep the key alive indefinitely.
I call this a protocol failure, he calls it a feature.

[1] http://www.imc.org/ietf-openpgp/mail-archive/msg02374.html


-- 
Bodo Möller <moeller@cdc.informatik.tu-darmstadt.de>;
PGP http://www.informatik.tu-darmstadt.de/TI/Mitarbeiter/moeller/0x36d2c658.html
* TU Darmstadt, Theoretische Informatik, Alexanderstr. 10, D-64283 Darmstadt
* Tel. +49-6151-16-6628, Fax +49-6151-16-6036