Proof-of-Possession Key Semantics for CBOR Web Tokens (CWTs)
draft-ietf-ace-cwt-proof-of-possession-01

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Last updated 2017-10-30
Replaces draft-jones-ace-cwt-proof-of-possession
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ACE Working Group                                               M. Jones
Internet-Draft                                                 Microsoft
Intended status: Standards Track                                L. Seitz
Expires: May 3, 2018                                           RISE SICS
                                                             G. Selander
                                                             Ericsson AB
                                                           E. Wahlstroem

                                                              S. Erdtman
                                                              Spotify AB
                                                           H. Tschofenig
                                                                ARM Ltd.
                                                        October 30, 2017

      Proof-of-Possession Key Semantics for CBOR Web Tokens (CWTs)
               draft-ietf-ace-cwt-proof-of-possession-01

Abstract

   This specification describes how to declare in a CBOR Web Token (CWT)
   that the presenter of the CWT possesses a particular proof-of-
   possession key.  Being able to prove possession of a key is also
   sometimes described as being the holder-of-key.  This specification
   provides equivalent functionality to "Proof-of-Possession Key
   Semantics for JSON Web Tokens (JWTs)" (RFC 7800), but using CBOR and
   CWTs rather than JSON and JWTs.

Status of This Memo

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

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on May 3, 2018.

Jones, et al.              Expires May 3, 2018                  [Page 1]
Internet-Draft      Proof-of-Possession Key for CWTs        October 2017

Copyright Notice

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   document authors.  All rights reserved.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Notational Conventions  . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Representations for Proof-of-Possession Keys  . . . . . . . .   3
     3.1.  Confirmation Claim  . . . . . . . . . . . . . . . . . . .   4
     3.2.  Representation of an Asymmetric Proof-of-Possession Key .   5
     3.3.  Representation of an Encrypted Symmetric Proof-of-
           Possession Key  . . . . . . . . . . . . . . . . . . . . .   5
     3.4.  Representation of a Key ID for a Proof-of-Possession Key    6
     3.5.  Specifics Intentionally Not Specified . . . . . . . . . .   7
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   5.  Privacy Considerations  . . . . . . . . . . . . . . . . . . .   8
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
     6.1.  CBOR Web Token Claims Registration  . . . . . . . . . . .   9
       6.1.1.  Registry Contents . . . . . . . . . . . . . . . . . .   9
     6.2.  CWT Confirmation Methods Registry . . . . . . . . . . . .   9
       6.2.1.  Registration Template . . . . . . . . . . . . . . . .  10
       6.2.2.  Initial Registry Contents . . . . . . . . . . . . . .  10
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  11
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .  11
     7.2.  Informative References  . . . . . . . . . . . . . . . . .  12
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .  13
   Open Issues . . . . . . . . . . . . . . . . . . . . . . . . . . .  13
   Document History  . . . . . . . . . . . . . . . . . . . . . . . .  13
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  13

1.  Introduction

   This specification describes how a CBOR Web Token [CWT] can declare
   that the presenter of the CWT possesses a particular proof-of-
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