Robust Scheduling against Selective Jamming in 6TiSCH Networks
draft-tiloca-6tisch-robust-scheduling-02

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6TiSCH Working Group                                           M. Tiloca
Internet-Draft                                                   RISE AB
Intended status: Standards Track                            S. Duquennoy
Expires: December 12, 2019                             Yanzi Networks AB
                                                                 G. Dini
                                                      University of Pisa
                                                           June 10, 2019

     Robust Scheduling against Selective Jamming in 6TiSCH Networks
                draft-tiloca-6tisch-robust-scheduling-02

Abstract

   This document defines a method to generate robust TSCH schedules in a
   6TiSCH (IPv6 over the TSCH mode of IEEE 802.15.4-2015) network, so as
   to protect network nodes against selective jamming attack.  Network
   nodes independently compute the new schedule at each slotframe, by
   altering the one originally available from 6top or alternative
   protocols, while preserving a consistent and collision-free
   communication pattern.  This method can be added on top of the
   minimal security framework for 6TiSCH.

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   Copyright (c) 2019 IETF Trust and the persons identified as the
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   This document is subject to BCP 78 and the IETF Trust's Legal
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   (https://trustee.ietf.org/license-info) in effect on the date of

Tiloca, et al.          Expires December 12, 2019               [Page 1]
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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
   2.  Properties of TSCH that Simplify Selective Jamming  . . . . .   4
   3.  Selective Jamming Attack  . . . . . . . . . . . . . . . . . .   5
     3.1.  Adversary Model . . . . . . . . . . . . . . . . . . . . .   5
     3.2.  Attack Example  . . . . . . . . . . . . . . . . . . . . .   6
   4.  Building Robust Schedules . . . . . . . . . . . . . . . . . .   7
   5.  Adaptation to the 6TiSCH Minimal Security Framework . . . . .   9
     5.1.  Error Handling  . . . . . . . . . . . . . . . . . . . . .  10
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  10
     6.1.  Effectiveness of Schedule Shuffling . . . . . . . . . . .  11
     6.2.  Renewal of Key Material . . . . . . . . . . . . . . . . .  11
     6.3.  Static Timeslot Allocations . . . . . . . . . . . . . . .  11
     6.4.  Network Joining Through Randez-vous Cells . . . . . . . .  12
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  12
     7.1.  Permutation Key Set . . . . . . . . . . . . . . . . . . .  12
     7.2.  Permutation Cipher  . . . . . . . . . . . . . . . . . . .  13
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  13
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  13
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  14
   Appendix A.  Test Vector  . . . . . . . . . . . . . . . . . . . .  14
     A.1.  Detailed Technique  . . . . . . . . . . . . . . . . . . .  15
       A.1.1.  Data Structures and Schedule Encoding . . . . . . . .  15
       A.1.2.  Pseudo-Random Number Generation . . . . . . . . . . .  15
       A.1.3.  Array Permutation . . . . . . . . . . . . . . . . . .  16
       A.1.4.  Schedule Permutation  . . . . . . . . . . . . . . . .  16
     A.2.  Test Configuration  . . . . . . . . . . . . . . . . . . .  17
     A.3.  Example Output  . . . . . . . . . . . . . . . . . . . . .  17
   Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .  22
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  22

1.  Introduction

   Nodes in a 6TiSCH network communicate using the IEEE 802.15.4-2015