Lightweight Authenticated Time (LATe) Synchronization Protocol
draft-navas-ace-secure-time-synchronization-00

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ACE Working Group                                               R. Navas
Internet-Draft                                          Telecom Bretagne
Intended status: Standards Track                             G. Selander
Expires: May 4, 2017                                         Ericsson AB
                                                                L. Seitz
                                                        SICS Swedish ICT
                                                        October 31, 2016

     Lightweight Authenticated Time (LATe) Synchronization Protocol
             draft-navas-ace-secure-time-synchronization-00

Abstract

   This documents defines the Lightweight Authenticated Time (LATe)
   Synchronization Protocol, a secure time synchronization protocol for
   constrained environments.  The messages are encoded using Concise
   Binary Object Representation (CBOR) and basic security services are
   provided by CBOR Object Signing and Encryption (COSE).  A secure
   source of time is a base assumption for many other services,
   including security services.  LATe Synchronization protocol enables
   these time-dependent services to run in the context of a constrained
   environment.

Status of This Memo

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   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

Navas, et al.              Expires May 4, 2017                  [Page 1]
Internet-Draft        LATe Synchronization Protocol         October 2016

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   publication of this document.  Please review these documents
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
     1.2.  Motivation  . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Protocol Goals, Actors and Assumptions  . . . . . . . . . . .   4
   3.  Base Protocol . . . . . . . . . . . . . . . . . . . . . . . .   5
     3.1.  Message Exchanges and Semantics . . . . . . . . . . . . .   5
     3.2.  Time Synchronization Calculation  . . . . . . . . . . . .   6
   4.  Message Encodings . . . . . . . . . . . . . . . . . . . . . .   7
     4.1.  CBOR TIC and MSG1: Time Request . . . . . . . . . . . . .   7
     4.2.  CBOR TOC and MSG2: Time Representation Response . . . . .   9
   5.  Protocol Triggering . . . . . . . . . . . . . . . . . . . . .  10
   6.  Protocol on ACE Framework . . . . . . . . . . . . . . . . . .  11
     6.1.  Actors Mappings . . . . . . . . . . . . . . . . . . . . .  11
     6.2.  Possible Scenarios  . . . . . . . . . . . . . . . . . . .  11
     6.3.  Solution For Scenario 1.1 . . . . . . . . . . . . . . . .  12
     6.4.  Solution For Scenario 1.2 . . . . . . . . . . . . . . . .  13
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  15
   8.  Privacy Considerations  . . . . . . . . . . . . . . . . . . .  17
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  17
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  17
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  17
     10.2.  Informative References . . . . . . . . . . . . . . . . .  18
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  19

1.  Introduction

   Authentication and Authorization for Constrained Environments (ACE)
   working group defined a framework for authentication and
   authorization in Internet of Things (IoT) environments: the ACE
   framework [I-D.ietf-ace-oauth-authz].  Many security services offered
   rely on measuring time in constrained devices, for determining
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