Comparison of CoAP Security Protocols
draft-ietf-lwig-security-protocol-comparison-03
LWIG Working Group J. Mattsson
Internet-Draft F. Palombini
Intended status: Informational Ericsson AB
Expires: September 12, 2019 March 11, 2019
Comparison of CoAP Security Protocols
draft-ietf-lwig-security-protocol-comparison-03
Abstract
This document analyzes and compares the sizes of key exchange flights
and the per-packet message size overheads when using different
security protocols to secure CoAP. The analyzed security protocols
are DTLS 1.2, DTLS 1.3, TLS 1.2, TLS 1.3, EDHOC, OSCORE, and Group
OSCORE. The DTLS and TLS record layers are analyzed with and without
6LoWPAN-GHC compression. DTLS is analyzed with and without
Connection ID.
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Internet-Draft Comparison of CoAP Security Protocols March 2019
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Overhead of Key Exchange Protocols . . . . . . . . . . . . . 3
2.1. Summary . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2. DTLS 1.3 . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2.1. Message Sizes RPK + ECDHE . . . . . . . . . . . . . . 5
2.2.2. Message Sizes PSK + ECDHE . . . . . . . . . . . . . . 10
2.2.3. Message Sizes PSK . . . . . . . . . . . . . . . . . . 11
2.2.4. Cached Information . . . . . . . . . . . . . . . . . 12
2.2.5. Resumption . . . . . . . . . . . . . . . . . . . . . 13
2.2.6. Without Connection ID . . . . . . . . . . . . . . . . 14
2.2.7. DTLS Raw Public Keys . . . . . . . . . . . . . . . . 15
2.3. TLS 1.3 . . . . . . . . . . . . . . . . . . . . . . . . . 16
2.3.1. Message Sizes RPK + ECDHE . . . . . . . . . . . . . . 16
2.3.2. Message Sizes PSK + ECDHE . . . . . . . . . . . . . . 22
2.3.3. Message Sizes PSK . . . . . . . . . . . . . . . . . . 23
2.4. EDHOC . . . . . . . . . . . . . . . . . . . . . . . . . . 24
2.4.1. Message Sizes RPK . . . . . . . . . . . . . . . . . . 24
2.4.2. Message Sizes Certificates . . . . . . . . . . . . . 26
2.4.3. Message Sizes PSK . . . . . . . . . . . . . . . . . . 26
2.4.4. message_1 . . . . . . . . . . . . . . . . . . . . . . 26
2.4.5. message_2 . . . . . . . . . . . . . . . . . . . . . . 26
2.4.6. message_3 . . . . . . . . . . . . . . . . . . . . . . 27
2.4.7. Summary . . . . . . . . . . . . . . . . . . . . . . . 27
2.5. Conclusion . . . . . . . . . . . . . . . . . . . . . . . 27
3. Overhead for Protection of Application Data . . . . . . . . . 28
3.1. Summary . . . . . . . . . . . . . . . . . . . . . . . . . 28
3.2. DTLS 1.2 . . . . . . . . . . . . . . . . . . . . . . . . 30
3.2.1. DTLS 1.2 . . . . . . . . . . . . . . . . . . . . . . 30
3.2.2. DTLS 1.2 with 6LoWPAN-GHC . . . . . . . . . . . . . . 30
3.2.3. DTLS 1.2 with Connection ID . . . . . . . . . . . . . 31
3.2.4. DTLS 1.2 with Connection ID and 6LoWPAN-GHC . . . . . 32
3.3. DTLS 1.3 . . . . . . . . . . . . . . . . . . . . . . . . 32
3.3.1. DTLS 1.3 . . . . . . . . . . . . . . . . . . . . . . 32
3.3.2. DTLS 1.3 with 6LoWPAN-GHC . . . . . . . . . . . . . . 33
3.3.3. DTLS 1.3 with Connection ID . . . . . . . . . . . . . 33
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