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+Internet Engineering Task Force (IETF)                        R. Housley
+Request for Comments: 5877                                Vigil Security
+Category: Informational                                         May 2010
+ISSN: 2070-1721
+
+
+  The application/pkix-attr-cert Media Type for Attribute Certificates
+
+Abstract
+
+   This document specifies a MIME media type used to carry a single
+   attribute certificate as defined in RFC 5755.
+
+Status of This Memo
+
+   This document is not an Internet Standards Track specification; it is
+   published for informational purposes.
+
+   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 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/rfc5877.
+
+Copyright Notice
+
+   Copyright (c) 2010 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.
+
+
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+Housley                       Informational                     [Page 1]
+
+RFC 5877          application/pkix-attr-cert Media Type         May 2010
+
+
+1.  Introduction
+
+   RFC 2585 [RFC2585] defines the MIME media types for public key
+   certificates and certificate revocation lists (CRLs).  This document
+   specifies a MIME media type for use with attribute certificates as
+   defined in RFC 5755 [RFC5755].
+
+   Attribute certificates are ASN.1 encoded [X.680].  RFC 5755 [RFC5755]
+   tells which portions of the attribute certificate must use the
+   distinguished encoding rules (DER) [X.690] and which portions are
+   permitted to use the basic encoding rules (BER) [X.690].  Since DER
+   is a proper subset of BER, BER decoding all parts of a properly
+   constructed attribute certificate will be successful.
+
+2.  IANA Considerations
+
+   This document registers with IANA the "application/pkix-attr-cert"
+   Internet Media Type for use with an attribute certificate as defined
+   in [RFC5755].  This registration follows the procedures defined in
+   BCP 13 [RFC4288].
+
+      Type name: application
+
+      Subtype name: pkix-attr-cert
+
+      Required parameters: None
+
+      Optional parameters: None
+
+      Encoding considerations: binary
+
+      Security considerations:
+        An attribute certificate provides authorization information.  An
+        attribute certificate is most often used in conjunction with a
+        public key certificate [RFC5280], and the two certificates
+        should use the same encoding of the distinguished name as
+        described in the Security Considerations of this document.
+
+      Interoperability considerations:
+        The media type will be used with HTTP to fetch attribute
+        certificates.  Other uses may emerge in the future.
+
+      Published specification: RFC 5755
+
+
+
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+
+Housley                       Informational                     [Page 2]
+
+RFC 5877          application/pkix-attr-cert Media Type         May 2010
+
+
+      Applications that use this media type:
+        The media type is used with a MIME-compliant transport to
+        transfer an attribute certificate.  Attribute certificates
+        convey authorization information, and they are most often used
+        in conjunction with public key certificates as defined in
+        [RFC5280].
+
+      Additional information:
+        Magic number(s): None
+        File extension(s): .ac
+        Macintosh File Type Code(s): none
+
+      Person & email address to contact for further information:
+        Russ Housley
+        housley@vigilsec.com
+
+      Intended usage: COMMON
+
+      Restrictions on usage: none
+
+      Author:
+        Russ Housley <housley@vigilsec.com>
+
+      Intended usage: COMMON
+
+      Change controller:
+        The IESG <iesg@ietf.org>
+
+3.  Security Considerations
+
+   Attribute certificate issuers must encode the holder entity name in
+   exactly the same way as the public key certificate distinguished
+   name.  If they are encoded differently, implementations may fail to
+   recognize that the attribute certificate and public key certificate
+   belong to the same entity.
+
+4.  References
+
+4.1.  Normative References
+
+   [RFC5755]   Farrell, S., Housley, R., and S. Turner, "An Internet
+               Attribute Certificate Profile for Authorization",
+               RFC 5755, January 2010.
+
+
+
+
+
+
+
+
+Housley                       Informational                     [Page 3]
+
+RFC 5877          application/pkix-attr-cert Media Type         May 2010
+
+
+4.2.  Informative References
+
+   [RFC2585]   Housley, R. and P. Hoffman, "Internet X.509 Public Key
+               Infrastructure Operational Protocols: FTP and HTTP",
+               RFC 2585, May 1999.
+
+   [RFC4288]   Freed, N. and J. Klensin, "Media Type Specifications and
+               Registration Procedures", BCP 13, RFC 4288,
+               December 2005.
+
+   [RFC5280]   Cooper, D., Santesson, S., Farrell, S., Boeyen, S.,
+               Housley, R., and W. Polk, "Internet X.509 Public Key
+               Infrastructure Certificate and Certificate Revocation
+               List (CRL) Profile", RFC 5280, May 2008.
+
+   [X.680]     ITU-T Recommendation X.680 (2002) | ISO/IEC 8824-1:2002,
+               Information technology - Abstract Syntax Notation One
+               (ASN.1):  Specification of basic notation.
+
+   [X.690]     ITU-T Recommendation X.690 (2002) | ISO/IEC 8825-1:2002,
+               Information technology - ASN.1 encoding rules:
+               Specification of Basic Encoding Rules (BER), Canonical
+               Encoding Rules (CER) and Distinguished Encoding
+               Rules (DER).
+
+Author's Address
+
+   Russell Housley
+   Vigil Security, LLC
+   918 Spring Knoll Drive
+   Herndon, VA 20170
+   USA
+   EMail: housley@vigilsec.com
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+Housley                       Informational                     [Page 4]
+