Group OSCORE - Secure Group Communication for CoAP
draft-ietf-core-oscore-groupcomm-11
CoRE Working Group M. Tiloca
Internet-Draft RISE AB
Intended status: Standards Track G. Selander
Expires: August 26, 2021 F. Palombini
J. Mattsson
Ericsson AB
J. Park
Universitaet Duisburg-Essen
February 22, 2021
Group OSCORE - Secure Group Communication for CoAP
draft-ietf-core-oscore-groupcomm-11
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
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
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on August 26, 2021.
Copyright Notice
Copyright (c) 2021 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
Tiloca, et al. Expires August 26, 2021 [Page 1]
Internet-Draft Group OSCORE February 2021
(https://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 6
2. Security Context . . . . . . . . . . . . . . . . . . . . . . 7
2.1. Common Context . . . . . . . . . . . . . . . . . . . . . 9
2.1.1. ID Context . . . . . . . . . . . . . . . . . . . . . 9
2.1.2. Counter Signature Algorithm . . . . . . . . . . . . . 9
2.1.3. Counter Signature Parameters . . . . . . . . . . . . 9
2.1.4. Secret Derivation Algorithm . . . . . . . . . . . . . 10
2.1.5. Secret Derivation Parameters . . . . . . . . . . . . 11
2.2. Sender Context and Recipient Context . . . . . . . . . . 11
2.3. Pairwise Keys . . . . . . . . . . . . . . . . . . . . . . 12
2.3.1. Derivation of Pairwise Keys . . . . . . . . . . . . . 12
2.3.2. Usage of Sequence Numbers . . . . . . . . . . . . . . 13
2.3.3. Security Context for Pairwise Mode . . . . . . . . . 14
2.4. Update of Security Context . . . . . . . . . . . . . . . 14
2.4.1. Loss of Mutable Security Context . . . . . . . . . . 15
2.4.2. Exhaustion of Sender Sequence Number . . . . . . . . 16
2.4.3. Retrieving New Security Context Parameters . . . . . 17
3. The Group Manager . . . . . . . . . . . . . . . . . . . . . . 19
3.1. Management of Group Keying Material . . . . . . . . . . . 20
3.2. Responsibilities of the Group Manager . . . . . . . . . . 21
4. The COSE Object . . . . . . . . . . . . . . . . . . . . . . . 23
4.1. Counter Signature . . . . . . . . . . . . . . . . . . . . 23
4.2. The 'kid' and 'kid context' parameters . . . . . . . . . 23
4.3. external_aad . . . . . . . . . . . . . . . . . . . . . . 23
5. OSCORE Header Compression . . . . . . . . . . . . . . . . . . 25
5.1. Examples of Compressed COSE Objects . . . . . . . . . . . 26
5.1.1. Examples in Group Mode . . . . . . . . . . . . . . . 26
5.1.2. Examples in Pairwise Mode . . . . . . . . . . . . . . 27
6. Message Binding, Sequence Numbers, Freshness and Replay
Show full document text