Secure group communication for CoAP
draft-ietf-core-oscore-groupcomm-02
CoRE Working Group M. Tiloca
Internet-Draft RISE SICS
Intended status: Standards Track G. Selander
Expires: December 30, 2018 F. Palombini
Ericsson AB
J. Park
Universitaet Duisburg-Essen
June 28, 2018
Secure group communication for CoAP
draft-ietf-core-oscore-groupcomm-02
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 is defined how OSCORE should be used in a group
communication setting, while fulfilling the same security
requirements for request messages and related response messages.
Source authentication of all messages exchanged within the group is
ensured, by means of digital signatures produced through private keys
of sender endpoints and embedded in the protected CoAP messages.
Status of This Memo
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provisions of BCP 78 and BCP 79.
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This Internet-Draft will expire on December 30, 2018.
Copyright Notice
Copyright (c) 2018 IETF Trust and the persons identified as the
document authors. All rights reserved.
Tiloca, et al. Expires December 30, 2018 [Page 1]
Internet-Draft Secure group communication for CoAP June 2018
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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
3. The COSE Object . . . . . . . . . . . . . . . . . . . . . . . 7
3.1. Example: Request . . . . . . . . . . . . . . . . . . . . 9
3.2. Example: Response . . . . . . . . . . . . . . . . . . . . 10
4. Message Processing . . . . . . . . . . . . . . . . . . . . . 10
4.1. Protecting the Request . . . . . . . . . . . . . . . . . 10
4.2. Verifying the Request . . . . . . . . . . . . . . . . . . 11
4.3. Protecting the Response . . . . . . . . . . . . . . . . . 11
4.4. Verifying the Response . . . . . . . . . . . . . . . . . 11
5. Synchronization of Sequence Numbers . . . . . . . . . . . . . 12
6. Responsibilities of the Group Manager . . . . . . . . . . . . 12
7. Security Considerations . . . . . . . . . . . . . . . . . . . 13
7.1. Group-level Security . . . . . . . . . . . . . . . . . . 14
7.2. Uniqueness of (key, nonce) . . . . . . . . . . . . . . . 14
7.3. Collision of Group Identifiers . . . . . . . . . . . . . 14
8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 15
9. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 15
10. References . . . . . . . . . . . . . . . . . . . . . . . . . 15
10.1. Normative References . . . . . . . . . . . . . . . . . . 15
10.2. Informative References . . . . . . . . . . . . . . . . . 16
Appendix A. Assumptions and Security Objectives . . . . . . . . 18
A.1. Assumptions . . . . . . . . . . . . . . . . . . . . . . . 18
A.2. Security Objectives . . . . . . . . . . . . . . . . . . . 20
Appendix B. List of Use Cases . . . . . . . . . . . . . . . . . 21
Appendix C. Example of Group Identifier Format . . . . . . . . . 23
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