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Internet X.509 Public Key Infrastructure -- Certificate Image
RFC 6170

Internet Engineering Task Force (IETF)                      S. Santesson
Request for Comments: 6170                                  3xA Security
Updates: 3709                                                 R. Housley
Category: Standards Track                                 Vigil Security
ISSN: 2070-1721                                                 S. Bajaj
                                                          Symantec Corp.
                                                            L. Rosenthol
                                                                   Adobe
                                                                May 2011

     Internet X.509 Public Key Infrastructure -- Certificate Image

Abstract

   This document specifies a method to bind a visual representation of a
   certificate in the form of a certificate image to a public key
   certificate as defined in RFC 5280, by defining a new "otherLogos"
   image type according to RFC 3709.

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/rfc6170.

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.

Santesson, et al.            Standards Track                    [Page 1]
RFC 6170                    Certificate Image                   May 2011

Table of Contents

   1. Introduction ....................................................2
      1.1. Terminology ................................................3
   2. Certificate Image ...............................................3
   3. LogotypeImageInfo ...............................................4
   4. Embedded Images .................................................5
   5. Certificate Image Formats .......................................6
      5.1. PDF ........................................................6
      5.2. SVG ........................................................6
      5.3. PNG ........................................................7
   6. Security Considerations .........................................7
   7. Acknowledgements ................................................8
   8. References ......................................................9
      8.1. Normative References .......................................9
      8.2. Informative References .....................................9
   Appendix A.  ASN.1 Module .........................................10
   Appendix B.  Example ..............................................11

1.  Introduction

   This standard specifies how to bind a certificate image to a
   certificate (defined in [RFC5280]), providing a visual representation
   of that certificate using the Logotype extension defined in [RFC3709]
   and specifying the certificate image as a new "otherLogos" type.

   The purpose of the certificate image is to aid human interpretation
   of a certificate by providing meaningful visual information to the
   user interface (UI).

   Typical situations when a human needs to examine the visual
   representation of a certificate are:

   -  A person establishes a secured channel with an authenticated
      service.  The person needs to determine the identity of the
      service based on the authenticated credentials.

   -  A person validates the signature on critical information, such as
      signed executable code, and needs to determine the identity of the
      signer based on the signer's certificate.

   -  A person is required to select an appropriate certificate to be
      used when authenticating to a service or Identity Management
      infrastructure.  The person needs to see the available
      certificates in order to distinguish between them in the selection

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