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