Trust Anchor Format
RFC 5914

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Internet Engineering Task Force (IETF)                        R. Housley
Request for Comments: 5914                           Vigil Security, LLC
Category: Standards Track                                     S. Ashmore
ISSN: 2070-1721                                 National Security Agency
                                                              C. Wallace
                                                      Cygnacom Solutions
                                                               June 2010

                          Trust Anchor Format

Abstract

   This document describes a structure for representing trust anchor
   information.  A trust anchor is an authoritative entity represented
   by a public key and associated data.  The public key is used to
   verify digital signatures, and the associated data is used to
   constrain the types of information or actions for which the trust
   anchor is authoritative.  The structures defined in this document are
   intended to satisfy the format-related requirements defined in Trust
   Anchor Management Requirements.

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/rfc5914.

Housley, et al.              Standards Track                    [Page 1]
RFC 5914                           TAF                         June 2010

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   than English.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.1.  Terminology  . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Trust Anchor Information Syntax  . . . . . . . . . . . . . . .  3
     2.1.  Version  . . . . . . . . . . . . . . . . . . . . . . . . .  3
     2.2.  Public Key . . . . . . . . . . . . . . . . . . . . . . . .  3
     2.3.  Key Identifier . . . . . . . . . . . . . . . . . . . . . .  4
     2.4.  Trust Anchor Title . . . . . . . . . . . . . . . . . . . .  4
     2.5.  Certification Path Controls  . . . . . . . . . . . . . . .  4
     2.6.  Extensions . . . . . . . . . . . . . . . . . . . . . . . .  8
   3.  Trust Anchor List  . . . . . . . . . . . . . . . . . . . . . .  8
   4.  Security Considerations  . . . . . . . . . . . . . . . . . . .  9
   5.  References . . . . . . . . . . . . . . . . . . . . . . . . . .  9
     5.1.  Normative References . . . . . . . . . . . . . . . . . . .  9
     5.2.  Informative References . . . . . . . . . . . . . . . . . . 10
   Appendix A.  ASN.1 Modules . . . . . . . . . . . . . . . . . . . . 11
     A.1.  ASN.1 Module Using 2002 Syntax . . . . . . . . . . . . . . 11
     A.2.  ASN.1 Module Using 1988 Syntax . . . . . . . . . . . . . . 12
       A.2.1.  ASN.1 Module . . . . . . . . . . . . . . . . . . . . . 12

Housley, et al.              Standards Track                    [Page 2]
RFC 5914                           TAF                         June 2010

1.  Introduction

   Trust anchors are widely used to verify digital signatures and
   validate certification paths [RFC5280][X.509].  They are required
   when validating certification paths.  Though widely used, there is no
   standard format for representing trust anchor information.  This