[DNSOP] Root zone KSK-2010 is now revoked

Matt Larson <matt.larson@icann.org> Fri, 11 January 2019 14:07 UTC

Return-Path: <matt.larson@icann.org>
X-Original-To: dnsop@ietfa.amsl.com
Delivered-To: dnsop@ietfa.amsl.com
Received: from localhost (localhost []) by ietfa.amsl.com (Postfix) with ESMTP id 5407F1228B7 for <dnsop@ietfa.amsl.com>; Fri, 11 Jan 2019 06:07:50 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -4.201
X-Spam-Status: No, score=-4.201 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001] autolearn=ham autolearn_force=no
Received: from mail.ietf.org ([]) by localhost (ietfa.amsl.com []) (amavisd-new, port 10024) with ESMTP id kWq473LbdOBA for <dnsop@ietfa.amsl.com>; Fri, 11 Jan 2019 06:07:48 -0800 (PST)
Received: from out.east.pexch112.icann.org (out.east.pexch112.icann.org []) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 9C0FF1200B3 for <dnsop@ietf.org>; Fri, 11 Jan 2019 06:07:48 -0800 (PST)
Received: from PMBX112-E1-VA-2.pexch112.icann.org ( by PMBX112-E1-VA-1.pexch112.icann.org ( with Microsoft SMTP Server (TLS) id 15.0.1367.3; Fri, 11 Jan 2019 09:07:46 -0500
Received: from PMBX112-E1-VA-2.pexch112.icann.org ([]) by PMBX112-E1-VA-2.pexch112.icann.org ([]) with mapi id 15.00.1367.000; Fri, 11 Jan 2019 06:07:45 -0800
From: Matt Larson <matt.larson@icann.org>
To: dnsop <dnsop@ietf.org>
Thread-Topic: Root zone KSK-2010 is now revoked
Thread-Index: AQHUqbcG1Q/RBnjWp0yaiRAeOf3qtA==
Date: Fri, 11 Jan 2019 14:07:44 +0000
Message-ID: <536B7B2F-7C6B-4E6F-B527-2ACEC81E9B68@icann.org>
Accept-Language: en-US
Content-Language: en-US
x-ms-exchange-messagesentrepresentingtype: 1
x-ms-exchange-transport-fromentityheader: Hosted
x-originating-ip: []
Content-Type: text/plain; charset="us-ascii"
Content-ID: <E56AD47FEFE83949B2536DF55C19F633@pexch112.icann.org>
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0
Archived-At: <https://mailarchive.ietf.org/arch/msg/dnsop/tHJdt_A3liFWj4uMoLw3wes22hI>
Subject: [DNSOP] Root zone KSK-2010 is now revoked
X-BeenThere: dnsop@ietf.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: IETF DNSOP WG mailing list <dnsop.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/dnsop>, <mailto:dnsop-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/dnsop/>
List-Post: <mailto:dnsop@ietf.org>
List-Help: <mailto:dnsop-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/dnsop>, <mailto:dnsop-request@ietf.org?subject=subscribe>
X-List-Received-Date: Fri, 11 Jan 2019 14:07:50 -0000

Dear colleagues,

A few moments ago, at 1400 UTC today, 11 January 2019, ICANN's root zone management partner, Verisign, published root zone serial number 2019011100 with the RFC 5011 REVOKE bit set. As a result, KSK-2010's key tag has changed from 19036 to 19164. In addition, the root DNSKEY RRset is now signed with two KSKs: the current KSK (KSK-2017) as well as the former KSK (KSK-2010). The second signature is required by RFC 5011 to prove possession of KSK-2010's private key to assert the revocation. This second signature makes the response to a query for the root zone's DNSKEY RRset increase in size from 1414 bytes to 1425 bytes.

We don't expect any operational issues from this change. The DNSKEY RRset size increase is small, and other zones currently publish considerably larger apex DNSKEY RRsets without apparent issue. In addition, because KSK-2010 has not been used for signing since the root KSK rollover to KSK-2017 on 11 October 2018, no DNSSEC validators that are currently validating correctly can be depending on it.

Nevertheless, please let us know if you suspect any issues or have any questions.

May we also suggest subscribing to ksk-rollover@icann.org to receive announcements and participate in discussion about the KSK rollover process in particular and DNSSEC in the root zone in general.

For the root zone management partners,

Matt Larson, VP of Research
ICANN Office of the CTO