Fluffy: Simplified Key Exchange for Constrained Environments
draft-hardjono-ace-fluffy-00

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Network Working Group                                        T. Hardjono
Internet-Draft                                                       MIT
Intended status: Standards Track                                N. Smith
Expires: September 24, 2015                                   Intel Corp
                                                          March 23, 2015

      Fluffy: Simplified Key Exchange for Constrained Environments
                      draft-hardjono-ace-fluffy-00

Abstract

   This document proposes a simplified key exchange protocol for the
   establishment of a symmetric key shared between two devices or
   entities within a constrained environment.  The pair-wise key
   establishment is performed using the mediation of a trusted Simple
   Key Distribution Center (SKDC) entity.  The protocol also supports
   the mediated distribution of a group-key among multiple devices or
   entities for the purposes of protecting multicast messages.

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Hardjono & Smith       Expires September 24, 2015               [Page 1]
Internet-Draft           Simplified Key Exchange              March 2015

   include Simplified BSD License text as described in Section 4.e of
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Notational Conventions  . . . . . . . . . . . . . . . . .   4
     1.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   5
     1.3.  Design Considerations . . . . . . . . . . . . . . . . . .   6
     1.4.  Out of Scope and Non-Goals: . . . . . . . . . . . . . . .   7
   2.  Pair-wise Shared Key (PSK) Establishment  . . . . . . . . . .   8
     2.1.  Basic Protocol Exchange . . . . . . . . . . . . . . . . .   8
     2.2.  Common Building Blocks  . . . . . . . . . . . . . . . . .  10
     2.3.  PSK-Request Message . . . . . . . . . . . . . . . . . . .  11
       2.3.1.  SKDC request body . . . . . . . . . . . . . . . . . .  12
     2.4.  PSK-Response Message  . . . . . . . . . . . . . . . . . .  12
       2.4.1.  Miniticket  . . . . . . . . . . . . . . . . . . . . .  13
       2.4.2.  Receipt for PSK . . . . . . . . . . . . . . . . . . .  14
     2.5.  PSK-Establish Message . . . . . . . . . . . . . . . . . .  15
       2.5.1.  Authenticator . . . . . . . . . . . . . . . . . . . .  15
     2.6.  PSK-Acknowledge Message . . . . . . . . . . . . . . . . .  16
   3.  Group Shared Key (GSK) Establishment  . . . . . . . . . . . .  17
     3.1.  GSK-Request Message . . . . . . . . . . . . . . . . . . .  19
     3.2.  GSK-Response Message  . . . . . . . . . . . . . . . . . .  20
       3.2.1.  Receipt for GSK . . . . . . . . . . . . . . . . . . .  21
     3.3.  GSK-Fetch Message . . . . . . . . . . . . . . . . . . . .  22
     3.4.  GSK-Deliver Message . . . . . . . . . . . . . . . . . . .  23
   4.  JSON Message Format . . . . . . . . . . . . . . . . . . . . .  23
   5.  Encryption and Checksums  . . . . . . . . . . . . . . . . . .  23
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  23
   7.  Privacy Considerations  . . . . . . . . . . . . . . . . . . .  23
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  24
   9.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  24
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  24
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  24
     10.2.  Informative References . . . . . . . . . . . . . . . . .  24
   Appendix A.  Document History . . . . . . . . . . . . . . . . . .  26
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  26

1.  Introduction

   This document proposes a simplified key exchange protocol for
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