Proof-Of-Possession Semantics for JSON Web Tokens (JWTs)
draft-ietf-oauth-proof-of-possession-02

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Document Type Active Internet-Draft (oauth WG)
Authors Michael Jones  , John Bradley  , Hannes Tschofenig 
Last updated 2015-03-09
Replaces draft-jones-oauth-proof-of-possession
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OAuth Working Group                                             M. Jones
Internet-Draft                                                 Microsoft
Intended status: Standards Track                              J. Bradley
Expires: September 10, 2015                                Ping Identity
                                                           H. Tschofenig
                                                             ARM Limited
                                                           March 9, 2015

        Proof-Of-Possession Semantics for JSON Web Tokens (JWTs)
                draft-ietf-oauth-proof-of-possession-02

Abstract

   This specification defines how to express a declaration in a JSON Web
   Token (JWT) that the presenter of the JWT possesses a particular key
   and that the recipient can cryptographically confirm proof-of-
   possession of the key by the presenter.  This property is also
   sometimes described as the presenter being a holder-of-key.

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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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on September 10, 2015.

Copyright Notice

   Copyright (c) 2015 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
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Jones, et al.          Expires September 10, 2015               [Page 1]
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   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.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.1.  Notational Conventions . . . . . . . . . . . . . . . . . .  4
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  4
   3.  Proof-Of-Possession Representation . . . . . . . . . . . . . .  4
     3.1.  Proof-of-Possession of an Asymmetric Key . . . . . . . . .  5
     3.2.  Proof-of-Possession of a Symmetric Key . . . . . . . . . .  5
     3.3.  Proof-of-Possession Using a Key ID . . . . . . . . . . . .  6
     3.4.  Confirmation . . . . . . . . . . . . . . . . . . . . . . .  7
     3.5.  Specifics Intentionally Not Specified  . . . . . . . . . .  7
   4.  Security Considerations  . . . . . . . . . . . . . . . . . . .  8
   5.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . .  8
     5.1.  JSON Web Token Claims Registration . . . . . . . . . . . .  9
       5.1.1.  Registry Contents  . . . . . . . . . . . . . . . . . .  9
     5.2.  JWT Confirmation Methods Registry  . . . . . . . . . . . . 10
       5.2.1.  Registration Template  . . . . . . . . . . . . . . . . 10
       5.2.2.  Initial Registry Contents  . . . . . . . . . . . . . . 10
   6.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 11
     6.1.  Normative References . . . . . . . . . . . . . . . . . . . 11
     6.2.  Informative References . . . . . . . . . . . . . . . . . . 11
   Appendix A.  Acknowledgements  . . . . . . . . . . . . . . . . . . 12
   Appendix B.  Document History  . . . . . . . . . . . . . . . . . . 12
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 12

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1.  Introduction

   This specification defines how to express a declaration in a JSON Web
   Token (JWT) [JWT] that the presenter of the JWT possesses a
   particular key and that the recipient can cryptographically confirm
   proof-of-possession of the key by the presenter.  This property is
   also sometimes described as the presenter being a holder-of-key.

   Envision the following two use cases.  The first use case describes
   the use of a symmetric proof-of-possession key and the second use
   case uses an asymmetric proof-of-possession key.

   An OAuth 2.0 authorization server generates a JWT and places an
   encrypted symmetric key inside the newly introduced confirmation
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