Re: [TLS] Rizzo claims implementation attach, should be interesting
Martin Rex <mrex@sap.com> Tue, 20 September 2011 23:12 UTC
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From: Martin Rex <mrex@sap.com>
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To: geoffk@geoffk.org
Date: Wed, 21 Sep 2011 01:14:27 +0200
In-Reply-To: <m2boueetaj.fsf@localhost.localdomain> from "Geoffrey Keating" at Sep 20, 11 03:35:32 pm
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Cc: asteingruebl@paypal-inc.com, tls@ietf.org
Subject: Re: [TLS] Rizzo claims implementation attach, should be interesting
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Geoffrey Keating wrote: > > Martin Rex <mrex@sap.com> writes: > > > SSL was NEVER designed with a promise that you could multiplex > > data from an evil attack with data from a victim over the very same > > SSL connection and be secure against adaptive chose plaintext > > attacks trying to recover data from the victim. > > This would imply that you should not use SSL for downloading e-mail > using POP or IMAP, because that's multiplexing evil data (mail sent to > you by the attacker) with trusted data (credentials and non-evil > mail). You are quite correct in recognizing that you might be helping the attacker in a known-plaintext or chosen-plaintext attack (and when you have an automatically polling IMAP client, maybe even an adaptive chosen-plaintext attack). So it would be sensible to limit the number of guesses for the attacker, and to not re-use the same crypto keys on subsequent accesses to the same IMAP server (TLS does the latter for you when you create a new TLS connection state for each subsequent access, i.e. TLS session resume or full handshake, both will do). -Martin
- Re: [TLS] Rizzo claims implementation attach, sho… David Wagner
- [TLS] Rizzo claims implementation attach, should … Tim Dierks
- Re: [TLS] Rizzo claims implementation attach, sho… Peter Gutmann
- Re: [TLS] Rizzo claims implementation attach, sho… =JeffH
- Re: [TLS] Rizzo claims implementation attach, sho… Martin Rex
- Re: [TLS] Rizzo claims implementation attach, sho… Steingruebl, Andy
- Re: [TLS] Rizzo claims implementation attach, sho… Martin Rex
- Re: [TLS] Rizzo claims implementation attach, sho… Marsh Ray
- Re: [TLS] Rizzo claims implementation attach, sho… Eric Rescorla
- Re: [TLS] Rizzo claims implementation attach, sho… Eric Rescorla
- Re: [TLS] Rizzo claims implementation attach, sho… Yoav Nir
- Re: [TLS] Rizzo claims implementation attach, sho… Marsh Ray
- Re: [TLS] Rizzo claims implementation attach, sho… Yoav Nir
- Re: [TLS] Rizzo claims implementation attach, sho… Martin Rex
- Re: [TLS] Rizzo claims implementation attach, sho… Marsh Ray
- Re: [TLS] Rizzo claims implementation attach, sho… Martin Rex
- Re: [TLS] Rizzo claims implementation attach, sho… Eric Rescorla
- Re: [TLS] Rizzo claims implementation attach, sho… Phillip Hallam-Baker
- Re: [TLS] Rizzo claims implementation attach, sho… Nico Williams
- Re: [TLS] Rizzo claims implementation attach, sho… Martin Rex
- Re: [TLS] Rizzo claims implementation attach, sho… Marsh Ray
- Re: [TLS] Rizzo claims implementation attach, sho… Martin Rex
- Re: [TLS] Rizzo claims implementation attach, sho… Geoffrey Keating
- Re: [TLS] Rizzo claims implementation attach, sho… Martin Rex
- Re: [TLS] Rizzo claims implementation attach, sho… Martin Rex
- Re: [TLS] Rizzo claims implementation attach, sho… =JeffH
- Re: [TLS] Rizzo claims implementation attach, sho… Nico Williams
- Re: [TLS] Rizzo claims implementation attach, sho… Martin Rex
- Re: [TLS] Rizzo claims implementation attach, sho… Martin Rex
- Re: [TLS] Rizzo claims implementation attach, sho… Martin Rex
- Re: [TLS] Rizzo claims implementation attach, sho… Nico Williams
- Re: [TLS] Rizzo claims implementation attach, sho… Marsh Ray
- Re: [TLS] Rizzo claims implementation attach, sho… Nico Williams
- Re: [TLS] Rizzo claims implementation attach, sho… Martin Rex
- Re: [TLS] Rizzo claims implementation attach, sho… Martin Rex
- Re: [TLS] Rizzo claims implementation attach, sho… Eric Rescorla
- Re: [TLS] Rizzo claims implementation attach, sho… Martin Rex
- Re: [TLS] Rizzo claims implementation attach, sho… Martin Rex
- Re: [TLS] Rizzo claims implementation attach, sho… Yngve N. Pettersen
- Re: [TLS] Rizzo claims implementation attach, sho… Martin Rex
- Re: [TLS] Rizzo claims implementation attach, sho… Yngve N. Pettersen
- Re: [TLS] Rizzo claims implementation attach, sho… Martin Rex
- Re: [TLS] Rizzo claims implementation attach, sho… Yoav Nir