Re: [TLS] draft-sheffer-tls-bcp: DH recommendations
Bill Frantz <frantz@pwpconsult.com> Wed, 18 September 2013 21:10 UTC
Return-Path: <frantz@pwpconsult.com>
X-Original-To: tls@ietfa.amsl.com
Delivered-To: tls@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 39CAB11E810A for <tls@ietfa.amsl.com>; Wed, 18 Sep 2013 14:10:59 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -0.369
X-Spam-Level:
X-Spam-Status: No, score=-0.369 tagged_above=-999 required=5 tests=[AWL=0.370, BAYES_20=-0.74]
Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id OLPMVlL52Mm7 for <tls@ietfa.amsl.com>; Wed, 18 Sep 2013 14:10:54 -0700 (PDT)
Received: from elasmtp-kukur.atl.sa.earthlink.net (elasmtp-kukur.atl.sa.earthlink.net [209.86.89.65]) by ietfa.amsl.com (Postfix) with ESMTP id 320F811E810B for <tls@ietf.org>; Wed, 18 Sep 2013 14:10:53 -0700 (PDT)
Received: from [173.75.83.246] (helo=Williams-MacBook-Pro.local) by elasmtp-kukur.atl.sa.earthlink.net with esmtpa (Exim 4.67) (envelope-from <frantz@pwpconsult.com>) id 1VMP1O-0004LL-L6 for tls@ietf.org; Wed, 18 Sep 2013 17:10:50 -0400
Date: Wed, 18 Sep 2013 14:10:50 -0700
From: Bill Frantz <frantz@pwpconsult.com>
To: tls@ietf.org
X-Priority: 3
In-Reply-To: <5239F4E8.7070007@stroeder.com>
Message-ID: <r422Ps-1075i-2C2D7B0A418A4E33AF208E394FDB4A63@Williams-MacBook-Pro.local>
MIME-Version: 1.0
Content-Type: text/plain; charset="UTF-8"; format="flowed"
Content-Transfer-Encoding: quoted-printable
X-Mailer: Mailsmith 2.3.1 (422)
X-ELNK-Trace: 3a5e54fa03f1b3e21aa676d7e74259b7b3291a7d08dfec794c640c7c373eabf556b357cc1a4a4d8e350badd9bab72f9c350badd9bab72f9c350badd9bab72f9c
X-Originating-IP: 173.75.83.246
Subject: Re: [TLS] draft-sheffer-tls-bcp: DH recommendations
X-BeenThere: tls@ietf.org
X-Mailman-Version: 2.1.12
Precedence: list
List-Id: "This is the mailing list for the Transport Layer Security working group of the IETF." <tls.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/tls>, <mailto:tls-request@ietf.org?subject=unsubscribe>
List-Archive: <http://www.ietf.org/mail-archive/web/tls>
List-Post: <mailto:tls@ietf.org>
List-Help: <mailto:tls-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/tls>, <mailto:tls-request@ietf.org?subject=subscribe>
X-List-Received-Date: Wed, 18 Sep 2013 21:10:59 -0000
On 9/18/13 at 11:46 AM, michael@stroeder.com (Michael Ströder) wrote: >First, I really appreciate that you write down this BCP document. >But I wonder what the exact scope should be. > >In the abstract you say "existing standards and implementations", I guess to >exclude approaches yet to be defined in a new standard. Agreed. >But does that also exclude pushing implementors to slightly improve their >software? The "deployers rather than for implementers" in the introduction >sounds like it. > >If that's the scope you're stuck into recommending the least common >denominator of today's implementations and implementors can take your RFC as >excuse to stop improving their implementations. >Also you're in the trap of choosing "widely-used" implementations for your >"Implementation Status" section which is always questionable depending on >personal deployments, especially since the main focus now seems to be web >servers and browsers. > >Frankly I have no idea how to get out of this though. I would address the issue of DHE keys that are limited to 1024 bits by saying that the use of 1024 bits is the best current practical practice. I would also follow that recommendation with a note that 1024 bits is smaller than the best current practice, but is the limit provided by current implementations, so following the best current practice will change when implementors get off their butts. A section in the document listing some of the implementations that can't perform to best current crypto practice and where they are deficient might also be a useful goad. Cheers - Bill --------------------------------------------------------------------------- Bill Frantz | Re: Computer reliability, performance, and security: 408-356-8506 | The guy who *is* wearing a parachute is *not* the www.pwpconsult.com | first to reach the ground. - Terence Kelly
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Yoav Nir
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Stephen Farrell
- [TLS] draft-sheffer-tls-bcp: DH recommendations Yaron Sheffer
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Yaron Sheffer
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Michael D'Errico
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Patrick Pelletier
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Xuelei Fan
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Martin Rex
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Yaron Sheffer
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Yoav Nir
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Yaron Sheffer
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Martin Rex
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Blumenthal, Uri - 0558 - MITLL
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Blumenthal, Uri - 0558 - MITLL
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Yaron Sheffer
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Peter Gutmann
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Yaron Sheffer
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Peter Gutmann
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Yaron Sheffer
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Michael Ströder
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Yaron Sheffer
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Blumenthal, Uri - 0558 - MITLL
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… james hughes
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… james hughes
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Blumenthal, Uri - 0558 - MITLL
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Michael Ströder
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Michael Ströder
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… james hughes
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Blumenthal, Uri - 0558 - MITLL
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Yoav Nir
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Yaron Sheffer
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Bill Frantz
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Ralph Holz
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Martin Rex
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Martin Rex
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Martin Rex
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… james hughes
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Peter Gutmann
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Peter Gutmann
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Yaron Sheffer
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Michael Ströder
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Yaron Sheffer
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… james hughes
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Peter Gutmann
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Michael Ströder
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Michael D'Errico
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Yoav Nir
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Yaron Sheffer
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Yaron Sheffer
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Stephen Farrell
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Patrick Pelletier
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Yoav Nir
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Michael D'Errico
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Yaron Sheffer
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Yaron Sheffer
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Ralph Holz
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… james hughes
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Ralph Holz
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Nikos Mavrogiannopoulos
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Patrick Pelletier
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Patrick Pelletier
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Patrick Pelletier
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Yoav Nir
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Peter Gutmann
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Patrick Pelletier
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Martin Rex
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Peter Gutmann
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Yaron Sheffer
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Alex Elsayed
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Michael D'Errico
- Re: [TLS] draft-sheffer-tls-bcp: DH recommendatio… Peter Gutmann
- [TLS] Safe ECC usage D. J. Bernstein
- Re: [TLS] Safe ECC usage Dan Brown
- Re: [TLS] Safe ECC usage D. J. Bernstein
- Re: [TLS] Safe ECC usage Dan Brown
- Re: [TLS] Safe ECC usage Kyle Hamilton
- Re: [TLS] Safe ECC usage Johannes Merkle
- Re: [TLS] Safe ECC usage Adam Langley
- Re: [TLS] Safe ECC usage Santosh Chokhani
- Re: [TLS] Safe ECC usage Martin Rex
- Re: [TLS] Safe ECC usage Kyle Hamilton
- Re: [TLS] Safe ECC usage Yoav Nir
- Re: [TLS] Safe ECC usage Martin Rex
- Re: [TLS] Safe ECC usage D. J. Bernstein
- Re: [TLS] Safe ECC usage Dan Brown
- Re: [TLS] Safe ECC usage Johannes Merkle
- Re: [TLS] Safe ECC usage Manuel Pégourié-Gonnard
- Re: [TLS] Safe ECC usage Yoav Nir
- Re: [TLS] Safe ECC usage D. J. Bernstein
- Re: [TLS] Safe ECC usage Dan Brown
- Re: [TLS] Safe ECC usage D. J. Bernstein
- Re: [TLS] Safe ECC usage Dan Brown
- Re: [TLS] Safe ECC usage Johannes Merkle
- [TLS] (offline note) Re: Safe ECC usage Rene Struik
- Re: [TLS] Safe ECC usage D. J. Bernstein
- [TLS] (EC)DSA potential problems (ECC "brittlenes… Martin Rex
- Re: [TLS] Safe ECC usage Dan Brown
- Re: [TLS] Safe ECC usage D. J. Bernstein
- Re: [TLS] Safe ECC usage Dan Brown
- Re: [TLS] Safe ECC usage Watson Ladd
- Re: [TLS] Safe ECC usage Dan Brown
- Re: [TLS] Safe ECC usage Johannes Merkle
- Re: [TLS] Safe ECC usage Nico Williams
- Re: [TLS] Safe ECC usage Dan Brown
- Re: [TLS] Safe ECC usage Nico Williams
- Re: [TLS] Safe ECC usage Michael StJohns
- Re: [TLS] Safe ECC usage Dan Brown
- Re: [TLS] Safe ECC usage Nico Williams
- Re: [TLS] Safe ECC usage Bill Frantz
- Re: [TLS] Safe ECC usage D. J. Bernstein
- Re: [TLS] Safe ECC usage Dan Brown
- [TLS] DH group negotiation extension [was: Re: dr… Daniel Kahn Gillmor
- Re: [TLS] DH group negotiation extension [was: Re… Dang, Quynh
- Re: [TLS] DH group negotiation extension [was: Re… Patrick Pelletier
- Re: [TLS] DH group negotiation extension [was: Re… Watson Ladd