PKEX
draft-harkins-pkex-01

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Internet Research Task Force                                     Harkins
Internet-Draft                                             HP Enterprise
Intended status: Informational                          October 31, 2016
Expires: May 4, 2017

                                  PKEX
                         draft-harkins-pkex-01

Abstract

   This memo describes a password-authenticated protocol to allow two
   devices to exchange "raw" (uncertified) public keys and establish
   trust that the keys belong to their respective identities.

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
   Task Force (IETF).  Note that other groups may also distribute
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   Internet-Drafts are draft documents valid for a maximum of six months
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   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on May 4, 2017.

Copyright Notice

   Copyright (c) 2016 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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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   2
     1.2.  Notation  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Properties  . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Assumptions . . . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Cryptographic Primitives  . . . . . . . . . . . . . . . . . .   5
   5.  Protocol Definition . . . . . . . . . . . . . . . . . . . . .   5
     5.1.  Exchange Phase  . . . . . . . . . . . . . . . . . . . . .   6
     5.2.  Commit/Reveal Phase . . . . . . . . . . . . . . . . . . .   6
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   8
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   9
   Appendix A.  Appendix . . . . . . . . . . . . . . . . . . . . . .   9
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   9

1.  Introduction

   Many authenticated key exchange protocols allow for authentication
   using uncertified, or "raw", public keys.  Usually these
   specifications-- e.g.  [RFC7250] for TLS and [RFC7670] for IKEv2--
   assume keys are exchanged in some out-of-band mechanism.

   [RFC7250] further states that "the main security challenge [to using
   'raw' public keys] is how to associate the public key with a specific
   entity.  Without a secure binding between identifier and key, the
   protocol will be vulnerable to man-in-the- middle attacks."

   The Public Key Exchange (PKEX) is designed to fill that gap: it
   establishs a secure binding between exchanged public keys and
   identifiers, it provides proof-of-possession of the exchanged public
   keys to each peer, and it enables the establishment of trust in
   public keys that can subsequently be used to faccilitate
   authentication in other authentication and key exchange protocols.

1.1.  Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].

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1.2.  Notation

   This memo describes a cryptographic exchange using sets of elements
   called groups.  Groups can be either traditional finite field or can
   be based on elliptic curves.  The public keys exchanged by PKEX are
   elements in a group.  Elements in groups are denoted in upper-case
   and scalar values are denoted with lower-case.  The generator of the