Group OSCORE - Secure Group Communication for CoAP
draft-ietf-core-oscore-groupcomm-09

Document Type Active Internet-Draft (core WG)
Last updated 2020-09-10 (latest revision 2020-06-23)
Replaces draft-tiloca-core-multicast-oscoap
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CoRE Working Group                                             M. Tiloca
Internet-Draft                                                   RISE AB
Intended status: Standards Track                             G. Selander
Expires: December 25, 2020                                  F. Palombini
                                                             Ericsson AB
                                                                 J. Park
                                             Universitaet Duisburg-Essen
                                                           June 23, 2020

           Group OSCORE - Secure Group Communication for CoAP
                  draft-ietf-core-oscore-groupcomm-09

Abstract

   This document defines Group Object Security for Constrained RESTful
   Environments (Group OSCORE), providing end-to-end security of CoAP
   messages exchanged between members of a group, e.g. sent over IP
   multicast.  In particular, the described approach defines how OSCORE
   is used in a group communication setting to provide source
   authentication for CoAP group requests, sent by a client to multiple
   servers, and for protection of the corresponding CoAP responses.

Status of This Memo

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   This Internet-Draft will expire on December 25, 2020.

Copyright Notice

   Copyright (c) 2020 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
   (https://trustee.ietf.org/license-info) in effect on the date of

Tiloca, et al.          Expires December 25, 2020               [Page 1]
Internet-Draft                Group OSCORE                     June 2020

   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   4
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   6
   2.  Security Context  . . . . . . . . . . . . . . . . . . . . . .   7
     2.1.  Common Context  . . . . . . . . . . . . . . . . . . . . .   8
       2.1.1.  ID Context  . . . . . . . . . . . . . . . . . . . . .   8
       2.1.2.  Counter Signature Algorithm . . . . . . . . . . . . .   9
       2.1.3.  Counter Signature Parameters  . . . . . . . . . . . .   9
       2.1.4.  Counter Signature Key Parameters  . . . . . . . . . .  10
     2.2.  Sender Context and Recipient Context  . . . . . . . . . .  10
     2.3.  Pairwise Keys . . . . . . . . . . . . . . . . . . . . . .  11
       2.3.1.  Derivation of Pairwise Keys . . . . . . . . . . . . .  11
       2.3.2.  Usage of Sequence Numbers . . . . . . . . . . . . . .  12
       2.3.3.  Security Context for Pairwise Mode  . . . . . . . . .  12
     2.4.  Update of Security Context  . . . . . . . . . . . . . . .  13
       2.4.1.  Loss of Mutable Security Context  . . . . . . . . . .  13
       2.4.2.  Exhaustion of Sender Sequence Numbers . . . . . . . .  13
       2.4.3.  Retrieving New Security Context Parameters  . . . . .  14
   3.  The Group Manager . . . . . . . . . . . . . . . . . . . . . .  15
     3.1.  Management of Group Keying Material . . . . . . . . . . .  16
     3.2.  Responsibilities of the Group Manager . . . . . . . . . .  17
   4.  The COSE Object . . . . . . . . . . . . . . . . . . . . . . .  18
     4.1.  Counter Signature . . . . . . . . . . . . . . . . . . . .  18
     4.2.  The 'kid' and 'kid context' parameters  . . . . . . . . .  19
     4.3.  external_aad  . . . . . . . . . . . . . . . . . . . . . .  19
       4.3.1.  external_aad for Encryption . . . . . . . . . . . . .  19
       4.3.2.  external_aad for Signing  . . . . . . . . . . . . . .  20
   5.  OSCORE Header Compression . . . . . . . . . . . . . . . . . .  21
     5.1.  Examples of Compressed COSE Objects . . . . . . . . . . .  21
       5.1.1.  Examples in Group Mode  . . . . . . . . . . . . . . .  22
       5.1.2.  Examples in Pairwise Mode . . . . . . . . . . . . . .  23
   6.  Message Binding, Sequence Numbers, Freshness and Replay
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