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Cryptographic Message Syntax (CMS) Algorithm Identifier Protection Attribute (RFC6211)

IP.com Disclosure Number: IPCOM000205869D
Original Publication Date: 2011-Apr-01
Included in the Prior Art Database: 2011-Apr-06
Document File: 22 page(s) / 23K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

J. Schaad: AUTHOR

Abstract

The Cryptographic Message Syntax [CMS], unlike X.509/PKIX certificates [RFC5280], is vulnerable to algorithm substitution attacks. In an algorithm substitution attack, the attacker changes either the algorithm being used or the parameters of the algorithm in order to change the result of a signature verification process. In X.509 certificates, the signature algorithm is protected because it is duplicated in the TBSCertificate.signature field with the proviso that the validator is to compare both fields as part of the signature validation process. This document defines a new attribute that contains a copy of the relevant algorithm identifiers so that they are protected by the signature or authentication process.

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Internet Engineering Task Force (IETF)                         J. Schaad Request for Comments: 6211                       Soaring Hawk Consulting Category: Standards Track                                     April 2011 ISSN: 2070-1721

                    Cryptographic Message Syntax (CMS)                Algorithm Identifier Protection Attribute

Abstract

   The Cryptographic Message Syntax (CMS), unlike X.509/PKIX    certificates, is vulnerable to algorithm substitution attacks.  In an    algorithm substitution attack, the attacker changes either the    algorithm being used or the parameters of the algorithm in order to    change the result of a signature verification process.  In X.509    certificates, the signature algorithm is protected because it is    duplicated in the TBSCertificate.signature field with the proviso    that the validator is to compare both fields as part of the signature    validation process.  This document defines a new attribute that    contains a copy of the relevant algorithm identifiers so that they    are protected by the signature or authentication process.

Status of This Memo

   This is an Internet Standards Track document.

   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).  Further information on    Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,    and how to provide feedback on it may be obtained at    http://www.rfc-editor.org/info/rfc6211.

Schaad                       Standards Track                    [Page 1]
 RFC 6211                 CMS Algorithm Attribute              April 2011

 Copyright Notice

   Copyright (c) 2011 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    (http://trustee.ietf.org/license-info) 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.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . 3      1.1.  Notation  . . . . . . . . . . . . . . . . . . . . . . . . . 5    2.  Attr...