Group OSCORE - Secure Group Communication for CoAP
draft-ietf-core-oscore-groupcomm-03

Document Type Active Internet-Draft (core WG)
Last updated 2018-10-22
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: April 25, 2019                                     F. Palombini
                                                             Ericsson AB
                                                                 J. Park
                                             Universitaet Duisburg-Essen
                                                        October 22, 2018

           Group OSCORE - Secure Group Communication for CoAP
                draft-ietf-core-oscore-groupcomm-03

Abstract

   This document describes a mode for protecting group communication
   over the Constrained Application Protocol (CoAP).  The proposed mode
   relies on Object Security for Constrained RESTful Environments
   (OSCORE) and the CBOR Object Signing and Encryption (COSE) format.
   In particular, it defines how OSCORE is used in a group communication
   setting, while fulfilling the same security requirements for group
   requests and responses.  Source authentication of all messages
   exchanged within the group is provided by means of digital signatures
   produced by the sender and embedded in the protected CoAP messages.

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 April 25, 2019.

Copyright Notice

   Copyright (c) 2018 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Tiloca, et al.           Expires April 25, 2019                 [Page 1]
Internet-Draft                Group OSCORE                  October 2018

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

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   4
   2.  OSCORE Security Context . . . . . . . . . . . . . . . . . . .   5
     2.1.  Management of Group Keying Material . . . . . . . . . . .   7
     2.2.  Wrap-Around of Partial IVs  . . . . . . . . . . . . . . .   8
   3.  The COSE Object . . . . . . . . . . . . . . . . . . . . . . .   8
   4.  OSCORE Header Compression . . . . . . . . . . . . . . . . . .   9
     4.1.  Encoding of the OSCORE Option Value . . . . . . . . . . .   9
     4.2.  Encoding of the OSCORE Payload  . . . . . . . . . . . . .  10
     4.3.  Examples of Compressed COSE Objects . . . . . . . . . . .  10
   5.  Message Binding, Sequence Numbers, Freshness and Replay
       Protection  . . . . . . . . . . . . . . . . . . . . . . . . .  11
     5.1.  Synchronization of Sender Sequence Numbers  . . . . . . .  12
   6.  Message Processing  . . . . . . . . . . . . . . . . . . . . .  12
     6.1.  Protecting the Request  . . . . . . . . . . . . . . . . .  13
     6.2.  Verifying the Request . . . . . . . . . . . . . . . . . .  13
     6.3.  Protecting the Response . . . . . . . . . . . . . . . . .  13
     6.4.  Verifying the Response  . . . . . . . . . . . . . . . . .  14
   7.  Responsibilities of the Group Manager . . . . . . . . . . . .  14
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .  15
     8.1.  Group-level Security  . . . . . . . . . . . . . . . . . .  15
     8.2.  Uniqueness of (key, nonce)  . . . . . . . . . . . . . . .  16
     8.3.  Management of Group Keying Material . . . . . . . . . . .  16
     8.4.  Update of Security Context and Key Rotation . . . . . . .  17
     8.5.  Collision of Group Identifiers  . . . . . . . . . . . . .  17
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  18
     9.1.  OSCORE Flag Bits Registry . . . . . . . . . . . . . . . .  18
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  18
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  18
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