Device Pairing Using Short Authentication Strings
draft-ietf-dnssd-pairing-03

Document Type Active Internet-Draft (dnssd WG)
Last updated 2017-09-10
Replaces draft-kaiser-dnssd-pairing
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Network Working Group                                         C. Huitema
Internet-Draft                                      Private Octopus Inc.
Intended status: Standards Track                               D. Kaiser
Expires: March 14, 2018                           University of Konstanz
                                                      September 10, 2017

           Device Pairing Using Short Authentication Strings
                      draft-ietf-dnssd-pairing-03

Abstract

   This document proposes a device pairing mechanism that establishes a
   relation between two devices by agreeing on a secret and manually
   verifying the secret's authenticity using an SAS (short
   authentication string).  Pairing has to be performed only once per
   pair of devices, as for a re-discovery at any later point in time,
   the exchanged secret can be used for mutual authentication.

   The proposed pairing method is suited for each application area where
   human operated devices need to establish a relation that allows
   configurationless and privacy preserving re-discovery at any later
   point in time.  Since privacy preserving applications are the main
   suitors, we especially care about privacy.

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 March 14, 2018.

Copyright Notice

   Copyright (c) 2017 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Huitema & Kaiser         Expires March 14, 2018                 [Page 1]
Internet-Draft               Device Pairing               September 2017

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements  . . . . . . . . . . . . . . . . . . . . . .   3
     1.2.  Document Organization . . . . . . . . . . . . . . . . . .   3
   2.  Protocol Specification  . . . . . . . . . . . . . . . . . . .   4
     2.1.  Discovery . . . . . . . . . . . . . . . . . . . . . . . .   4
     2.2.  Agreement on a Shared Secret  . . . . . . . . . . . . . .   5
     2.3.  Authentication  . . . . . . . . . . . . . . . . . . . . .   6
   3.  Optional Use of QR Codes  . . . . . . . . . . . . . . . . . .   8
     3.1.  Discovery Using QR Codes  . . . . . . . . . . . . . . . .   8
     3.2.  Agreement with QR Codes . . . . . . . . . . . . . . . . .   9
     3.3.  Authentication with QR Codes  . . . . . . . . . . . . . .   9
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  10
   6.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  10
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  10
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .  10
     7.2.  Informative References  . . . . . . . . . . . . . . . . .  10
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  11

1.  Introduction

   To engage in secure and privacy preserving communication, hosts need
   to differentiate between authorized peers, which must both know about
   the host's presence and be able to decrypt messages sent by the host,
   and other peers, which must not be able to decrypt the host's
   messages and ideally should not obtain information that could be used
   to identify the host.  The necessary relation between host and peer
   can be established by a centralized service, e.g. a certificate
   authority, by a web of trust, e.g.  PGP, or -- without using global
   identities -- by device pairing.

   This document proposes a device pairing mechanism that provides human
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