CBOR Profile of X.509 Certificates
draft-mattsson-cose-cbor-cert-compress-01

Document Type Active Internet-Draft (individual)
Authors Shahid Raza  , Joel Höglund  , Göran Selander  , John Preuß Mattsson  , Martin Furuhed 
Last updated 2020-07-13
Replaces draft-raza-ace-cbor-certificates, draft-mattsson-tls-cbor-cert-compress
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Network Working Group                                            S. Raza
Internet-Draft                                               J. Hoeglund
Intended status: Standards Track                                 RISE AB
Expires: January 14, 2021                                    G. Selander
                                                             J. Mattsson
                                                             Ericsson AB
                                                              M. Furuhed
                                                             Nexus Group
                                                           July 13, 2020

                   CBOR Profile of X.509 Certificates
               draft-mattsson-cose-cbor-cert-compress-01

Abstract

   This document specifies a CBOR encoding/compression of RFC 7925
   profiled certificates.  By using the fact that the certificates are
   profiled, the CBOR certificate compression algorithms can in many
   cases compress RFC 7925 profiled certificates with over 50%. This
   document also specifies COSE headers for CBOR encoded certificates as
   well as the use of the CBOR certificate compression algorithm with
   TLS Certificate Compression in TLS 1.3 and DTLS 1.3.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on January 14, 2021.

Copyright Notice

   Copyright (c) 2020 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

Raza, et al.            Expires January 14, 2021                [Page 1]
Internet-Draft     CBOR Profile of X.509 Certificates          July 2020

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   publication of this document.  Please review these documents
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Notational Conventions  . . . . . . . . . . . . . . . . . . .   4
   3.  CBOR Encoding . . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Deployment settings . . . . . . . . . . . . . . . . . . . . .   7
   5.  Expected Certificate Sizes  . . . . . . . . . . . . . . . . .   8
   6.  Native CBOR Certificates  . . . . . . . . . . . . . . . . . .   8
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
     8.1.  CBOR Certificate Types Registry . . . . . . . . . . . . .   9
     8.2.  CBOR Certificate Signature Algorithms Registry  . . . . .   9
     8.3.  CBOR Certificate Public Key Algorithms Registry . . . . .  10
     8.4.  COSE Header Parameters Registry . . . . . . . . . . . . .  10
     8.5.  TLS Certificate Compression Algorithm IDs Registry  . . .  11
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  11
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  11
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  12
   Appendix A.  Example CBOR Certificates  . . . . . . . . . . . . .  13
     A.1.  Example X.509 Certificate . . . . . . . . . . . . . . . .  13
     A.2.  Example CBOR Certificate Compression  . . . . . . . . . .  15
     A.3.  Example Native CBOR Certificate . . . . . . . . . . . . .  15
   Appendix B.  X.509 Certificate Profile, ASN.1 . . . . . . . . . .  16
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  17

1.  Introduction

   One of the challenges with deploying a Public Key Infrastructure
   (PKI) for the Internet of Things (IoT) is the size and encoding of
   X.509 public key certificates [RFC5280], since those are not
   optimized for constrained environments [RFC7228].  More compact
   certificate representations are desirable.  Due to the current PKI
   usage of X.509 certificates, keeping X.509 compatibility is necessary
   at least for a transition period.  However, the use of a more compact
   encoding with the Concise Binary Object Representation (CBOR)
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