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Using Secure DNS to Associate Certificates with Domain Names for S/MIME (RFC8162) Disclosure Number: IPCOM000250104D
Original Publication Date: 2017-May-01
Included in the Prior Art Database: 2017-Jun-01
Document File: 22 page(s) / 27K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

P. Hoffman: AUTHOR [+1]


S/MIME [RFC5751] messages often contain a certificate (some messages contain more than one certificate). These certificates assist in authenticating the sender of the message and can be used for encrypting messages that will be sent in reply. In order for the S/MIME receiver to authenticate that a message is from the sender identified in the message, the receiver's Mail User Agent (MUA) must validate that this certificate is associated with the purported sender. Currently, the MUA must trust a trust anchor upon which the sender's certificate is rooted and must successfully validate the certificate. There are other requirements on the MUA, such as associating the identity in the certificate with that of the message, that are out of scope for this document.

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Internet Engineering Task Force (IETF)                        P. Hoffman Request for Comments: 8162                                         ICANN Category: Experimental                                       J. Schlyter ISSN: 2070-1721                                                 Kirei AB                                                                 May 2017

 Using Secure DNS to Associate Certificates with Domain Names for S/MIME


   This document describes how to use secure DNS to associate an S/MIME    user's certificate with the intended domain name, similar to the way    that DNS-Based Authentication of Named Entities (DANE), RFC 6698,    does for TLS.

Status of This Memo

   This document is not an Internet Standards Track specification; it is    published for examination, experimental implementation, and    evaluation.

   This document defines an Experimental Protocol for the Internet    community.  This document is a product of the Internet Engineering    Task Force (IETF).  It represents the consensus of the IETF    community.  It has received public review and has been approved for    publication by the Internet Engineering Steering Group (IESG).  Not    all documents approved by the IESG are a candidate for any level of    Internet Standard; see Section 2 of RFC 7841.

   Information about the current status of this document, any errata,    and how to provide feedback on it may be obtained at

Copyright Notice

   Copyright (c) 2017 IETF Trust and the persons identified as the    document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal    Provisions Relating to IETF Documents    ( in effect on the date of    publication of this document.  Please review these documents    carefully, as they describe your rights and restrictions with respect    to this document.  Code Components extracted from this document must    include Simplified BSD License text as described in Section 4.e of    the Trust Legal Provisions and are provided without warranty as    described in the Simplified BSD License.

Hoffman & Schlyter            Experimental                      [Page 1]
 RFC 8162           DNS-Based Authentication for S/MIME          May 2017

 Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2

     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3

     1.2.  Experiment Goal . . . . . . . . . . . . . . . . . . . . .   3

   2.  The SMIMEA Resource Record  . . . . . . . . . . . . . . . ....