Ephemeral Diffie-Hellman Over COSE (EDHOC)
draft-selander-ace-cose-ecdhe-10
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ACE Working Group G. Selander
Internet-Draft J. Mattsson
Intended status: Standards Track F. Palombini
Expires: March 22, 2019 Ericsson AB
September 18, 2018
Ephemeral Diffie-Hellman Over COSE (EDHOC)
draft-selander-ace-cose-ecdhe-10
Abstract
This document specifies Ephemeral Diffie-Hellman Over COSE (EDHOC), a
very compact, and lightweight authenticated Diffie-Hellman key
exchange with ephemeral keys that can be used over any layer. EDHOC
provides mutual authentication, perfect forward secrecy, and identity
protection. EDHOC uses CBOR and COSE, allowing reuse of existing
libraries.
Status of This Memo
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This Internet-Draft will expire on March 22, 2019.
Copyright Notice
Copyright (c) 2018 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
(https://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
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include Simplified BSD License text as described in Section 4.e of
Selander, et al. Expires March 22, 2019 [Page 1]
Internet-Draft Ephemeral Diffie-Hellman Over COSE (EDHOC) September 2018
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Terminology and Requirements Language . . . . . . . . . . 4
2. Background . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. EDHOC Overview . . . . . . . . . . . . . . . . . . . . . . . 6
3.1. Ephemeral Public Keys . . . . . . . . . . . . . . . . . . 7
3.2. Key Derivation . . . . . . . . . . . . . . . . . . . . . 8
4. EDHOC Authenticated with Asymmetric Keys . . . . . . . . . . 9
4.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . 9
4.2. EDHOC Message 1 . . . . . . . . . . . . . . . . . . . . . 11
4.3. EDHOC Message 2 . . . . . . . . . . . . . . . . . . . . . 13
4.4. EDHOC Message 3 . . . . . . . . . . . . . . . . . . . . . 17
5. EDHOC Authenticated with Symmetric Keys . . . . . . . . . . . 19
5.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . 19
5.2. EDHOC Message 1 . . . . . . . . . . . . . . . . . . . . . 20
5.3. EDHOC Message 2 . . . . . . . . . . . . . . . . . . . . . 22
5.4. EDHOC Message 3 . . . . . . . . . . . . . . . . . . . . . 24
6. Error Handling . . . . . . . . . . . . . . . . . . . . . . . 26
6.1. EDHOC Error Message . . . . . . . . . . . . . . . . . . . 26
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 27
7.1. The Well-Known URI Registry . . . . . . . . . . . . . . . 27
7.2. Media Types Registry . . . . . . . . . . . . . . . . . . 27
7.3. CoAP Content-Formats Registry . . . . . . . . . . . . . . 28
8. Security Considerations . . . . . . . . . . . . . . . . . . . 28
8.1. Security Properties . . . . . . . . . . . . . . . . . . . 28
8.2. Cryptographic Considerations . . . . . . . . . . . . . . 29
8.3. Unprotected Data . . . . . . . . . . . . . . . . . . . . 29
8.4. Denial-of-Service . . . . . . . . . . . . . . . . . . . . 30
8.5. Implementation Considerations . . . . . . . . . . . . . . 30
8.6. Other Documents Referencing EDHOC . . . . . . . . . . . . 31
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 31
9.1. Normative References . . . . . . . . . . . . . . . . . . 31
9.2. Informative References . . . . . . . . . . . . . . . . . 32
9.3. URIs . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Appendix A. Use of CBOR, CDDL and COSE in EDHOC . . . . . . . . 34
A.1. CBOR and CDDL . . . . . . . . . . . . . . . . . . . . . . 34
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