IETF Logo Mail Archive

Re: DNSCurve vs. DNSSEC - FIGHT! (was OpenDNS today announced it has adopted DNSCurve to secure DNS)

Nikos Mavrogiannopoulos <nmav@gnutls.org> Thu, 25 February 2010 00:17 UTC

Return-Path: <n.mavrogiannopoulos@gmail.com>
X-Original-To: ietf@core3.amsl.com
Delivered-To: ietf@core3.amsl.com
Received: from localhost (localhost [127.0.0.1]) by core3.amsl.com (Postfix) with ESMTP id 1BC2428C28F for <ietf@core3.amsl.com>; Wed, 24 Feb 2010 16:17:24 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.977
X-Spam-Level:
X-Spam-Status: No, score=-1.977 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FM_FORGED_GMAIL=0.622]
Received: from mail.ietf.org ([64.170.98.32]) by localhost (core3.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id FkpWIOkmk+QF for <ietf@core3.amsl.com>; Wed, 24 Feb 2010 16:17:23 -0800 (PST)
Received: from mail-iw0-f191.google.com (mail-iw0-f191.google.com [209.85.223.191]) by core3.amsl.com (Postfix) with ESMTP id 2748728C284 for <ietf@ietf.org>; Wed, 24 Feb 2010 16:17:23 -0800 (PST)
Received: by iwn29 with SMTP id 29so3877651iwn.31 for <ietf@ietf.org>; Wed, 24 Feb 2010 16:19:28 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:sender:received:in-reply-to :references:date:x-google-sender-auth:message-id:subject:from:to:cc :content-type; bh=OhAh2WYb6y1JivRFeXAamx4y+RuNX8NNTgBUFEe1Z90=; b=O+0cD6qoqEpuj0Xj0Am95i3gwcHOSDzveCtexywz3PBKJMPl7H2d59moq1C/lB86xS CEnTABKaMOpok5XHlCIOVOrbXui7BS011IVQQUl2+DGgdzlY5zi/3CEqzqKjDXMwdLbg rPlPBeLf5Xi9Z1aJloqCqtzhLQH42C+vyqgBk=
DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:sender:in-reply-to:references:date :x-google-sender-auth:message-id:subject:from:to:cc:content-type; b=IZbHFxl8arcZPC0ejrXo/qbOutxEGG1+d4DCC1tBN0ovkdtMGIb2ThLLXESx9JWC3N M8L5j71rny6U4iU+HPSKHXK8b6aZPnpe5PMghdVz+3F2XJGsYbHyn4d1V/l5Kau36Bgg /24OLCZS9EnT5bJi5rXqohB8lVIPMDWPTddMA=
MIME-Version: 1.0
Sender: n.mavrogiannopoulos@gmail.com
Received: by 10.231.160.205 with SMTP id o13mr948459ibx.13.1267057167961; Wed, 24 Feb 2010 16:19:27 -0800 (PST)
In-Reply-To: <4B85BF52.7030004@necom830.hpcl.titech.ac.jp>
References: <874c02a21002231826y613b9f97ya83740ba240f7bf9@mail.gmail.com> <ABE739C5ADAC9A41ACCC72DF366B719D02C29D87@GLKMS2100.GREENLNK.NET> <a123a5d61002240700i4a68367tf901b91265f79da1@mail.gmail.com> <1267039830.9710.11106.camel@shane-asus-laptop> <alpine.LSU.2.00.1002242049510.16971@hermes-2.csi.cam.ac.uk> <p06240819c7ab46c7fbf9@10.20.30.158> <4B859F15.9080106@acm.org> <4B85B7E5.1000104@necom830.hpcl.titech.ac.jp> <201002242347.o1ONlt7L023898@drugs.dv.isc.org> <4B85BF52.7030004@necom830.hpcl.titech.ac.jp>
Date: Thu, 25 Feb 2010 01:19:27 +0100
X-Google-Sender-Auth: d65cb48631c7b35b
Message-ID: <c331d99a1002241619y47f91f50g4433a7233350dc74@mail.gmail.com>
Subject: Re: DNSCurve vs. DNSSEC - FIGHT! (was OpenDNS today announced it has adopted DNSCurve to secure DNS)
From: Nikos Mavrogiannopoulos <nmav@gnutls.org>
To: Masataka Ohta <mohta@necom830.hpcl.titech.ac.jp>
Content-Type: text/plain; charset="ISO-8859-1"
Cc: Paul Hoffman <paul.hoffman@vpnc.org>, IETF Discussion <ietf@ietf.org>
X-BeenThere: ietf@ietf.org
X-Mailman-Version: 2.1.9
Precedence: list
List-Id: IETF-Discussion <ietf.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/listinfo/ietf>, <mailto:ietf-request@ietf.org?subject=unsubscribe>
List-Archive: <http://www.ietf.org/mail-archive/web/ietf>
List-Post: <mailto:ietf@ietf.org>
List-Help: <mailto:ietf-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/ietf>, <mailto:ietf-request@ietf.org?subject=subscribe>
X-List-Received-Date: Thu, 25 Feb 2010 00:17:24 -0000

On Thu, Feb 25, 2010 at 1:07 AM, Masataka Ohta
<mohta@necom830.hpcl.titech.ac.jp> wrote:
> Mark Andrews wrote:
>
>>>>http://tools.ietf.org/html/draft-dempsky-dnscurve-00
>>>
>>>As I read the draft, it seems to me that DNSCurve without Curve
>>>(that is, with 96 bit nonce of DNSCurve as an extended message
>>>ID without elliptic curve cryptography) is secure enough.
>
>> Except from players that can see the query.
>
> That's not a new cryptographical problem.
>
> As DNSCurve protection is like DH, it is subject to MitM attacks,
> which is no different from simple nonce.

Not really. I Don't know what you mean by simple nonce, but as I
understand dnscurve if implemented properly would have ssh-style
authentication. Only the first request of the server key is vulnerable
with mitm. Then it should be cached.

regards,
Nikos

v2.23.0 | Report a Bug | By Email