Re: [TLS] I-D Action: draft-ietf-tls-prohibiting-rc4-01.txt

"Salz, Rich" <rsalz@akamai.com> Fri, 24 October 2014 14:31 UTC

Return-Path: <rsalz@akamai.com>
X-Original-To: tls@ietfa.amsl.com
Delivered-To: tls@ietfa.amsl.com
Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7E6DB1A00A7 for <tls@ietfa.amsl.com>; Fri, 24 Oct 2014 07:31:31 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2.61
X-Spam-Level:
X-Spam-Status: No, score=-2.61 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_LOW=-0.7, T_RP_MATCHES_RCVD=-0.01] autolearn=ham
Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id STbkwfYEe06Q for <tls@ietfa.amsl.com>; Fri, 24 Oct 2014 07:31:30 -0700 (PDT)
Received: from prod-mail-xrelay08.akamai.com (prod-mail-xrelay08.akamai.com [96.6.114.112]) by ietfa.amsl.com (Postfix) with ESMTP id 87C1A1A0006 for <tls@ietf.org>; Fri, 24 Oct 2014 07:31:28 -0700 (PDT)
Received: from prod-mail-xrelay08.akamai.com (localhost.localdomain [127.0.0.1]) by postfix.imss70 (Postfix) with ESMTP id A5DCB4862B for <tls@ietf.org>; Fri, 24 Oct 2014 14:31:27 +0000 (GMT)
Received: from prod-mail-relay09.akamai.com (prod-mail-relay09.akamai.com [172.27.22.68]) by prod-mail-xrelay08.akamai.com (Postfix) with ESMTP id 9A3D44862A for <tls@ietf.org>; Fri, 24 Oct 2014 14:31:27 +0000 (GMT)
Received: from email.msg.corp.akamai.com (usma1ex-cas3.msg.corp.akamai.com [172.27.123.32]) by prod-mail-relay09.akamai.com (Postfix) with ESMTP id 81C4E1E05B for <tls@ietf.org>; Fri, 24 Oct 2014 14:31:27 +0000 (GMT)
Received: from usma1ex-cashub5.kendall.corp.akamai.com (172.27.105.21) by usma1ex-dag1mb4.msg.corp.akamai.com (172.27.123.104) with Microsoft SMTP Server (TLS) id 15.0.913.22; Fri, 24 Oct 2014 10:31:26 -0400
Received: from USMBX1.msg.corp.akamai.com ([169.254.1.71]) by USMA1EX-CASHUB5.kendall.corp.akamai.com ([172.27.105.21]) with mapi; Fri, 24 Oct 2014 10:31:26 -0400
From: "Salz, Rich" <rsalz@akamai.com>
To: "tls@ietf.org" <tls@ietf.org>
Date: Fri, 24 Oct 2014 10:31:23 -0400
Thread-Topic: [TLS] I-D Action: draft-ietf-tls-prohibiting-rc4-01.txt
Thread-Index: Ac/vj67BPQJu6M8wTbC7Ay2vOOSRgwAB1Hig
Message-ID: <2A0EFB9C05D0164E98F19BB0AF3708C71D3AF65341@USMBX1.msg.corp.akamai.com>
References: <CAO7N=i3gC=+qcgHU=aMKtRyT7tZV5fm=9gJii-=yOpcNECOEvA@mail.gmail.com> <20141022175238.GF19158@mournblade.imrryr.org> <544837FD.202@cs.tcd.ie> <2A0EFB9C05D0164E98F19BB0AF3708C71D3AF651E4@USMBX1.msg.corp.akamai.com> <5449A667.9040105@cs.tcd.ie> <20141024133728.GI19158@mournblade.imrryr.org>
In-Reply-To: <20141024133728.GI19158@mournblade.imrryr.org>
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
acceptlanguage: en-US
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0
Archived-At: http://mailarchive.ietf.org/arch/msg/tls/IMvb_htA_V-vm55PH_tsiPXCDjs
Subject: Re: [TLS] I-D Action: draft-ietf-tls-prohibiting-rc4-01.txt
X-BeenThere: tls@ietf.org
X-Mailman-Version: 2.1.15
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: Fri, 24 Oct 2014 14:31:31 -0000

> Leaving a cipher suite out is only practical once it is no longer the best shared
> cipher with any peers.  

I don't agree with this blanket statement.  Sometimes nothing trumps "something is better than nothing."

When the IETF's leading cryptographers say not to use something, then you're better off with plaintext than a false sense of security for your users.

	/r$

--  
Principal Security Engineer, Akamai Technologies
IM: rsalz@jabber.me Twitter: RichSalz