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