CBOR Certificate Algorithm for TLS Certificate Compression
draft-mattsson-tls-cbor-cert-compress-00

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Last updated 2020-03-09
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Network Working Group                                 J. Preuss Mattsson
Internet-Draft                                               G. Selander
Updates: draft-ietf-tls-certificate-                         Ericsson AB
         compression (if approved)                               S. Raza
Intended status: Standards Track                             J. Hoeglund
Expires: September 10, 2020                                      RISE AB
                                                              M. Furuhed
                                                             Nexus Group
                                                          March 09, 2020

       CBOR Certificate Algorithm for TLS Certificate Compression
                draft-mattsson-tls-cbor-cert-compress-00

Abstract

   Certificate chains often take up the majority of the bytes
   transmitted in TLS handshakes.  Large handshakes can cause problems,
   particularly in constrained IoT environments.  RFC 7925 defines a TLS
   certificate profile for constrained IoT.  General purpose compression
   algorithms can in many cases not compress RFC 7925 profiled
   certificates at all.  By using the fact that the certificates are
   profiled, the CBOR certificate compression algorithms can in many
   cases compress RFC 7925 profiled certificates with over 50%. This
   document specifies the CBOR certificate compression algorithm for use
   with TLS Certificate Compression in TLS 1.3 and DTLS 1.3.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
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   This Internet-Draft will expire on September 10, 2020.

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Copyright Notice

   Copyright (c) 2020 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
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   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Notational Conventions  . . . . . . . . . . . . . . . . . . .   3
   3.  CBOR Certificate Compression Algorithm  . . . . . . . . . . .   3
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   4
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .   4
     6.2.  Informative References  . . . . . . . . . . . . . . . . .   5
   Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .   5
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   5

1.  Introduction

   As stated in [I-D.ietf-tls-certificate-compression], certificate
   chains often take up the majority of the bytes transmitted in TLS
   handshakes.  Large handshakes negatively affect latency, but can also
   result in that the handshake cannot be completed
   [I-D.ietf-emu-eaptlscert].  To reduce handshake sizes,
   [I-D.ietf-tls-certificate-compression] specifies a mechanism for
   lossless compression of certificate chains in TLS 1.3 and defines
   three general purpose compression algorithms.

   Large handshakes is particularly a problem for constrained IoT
   environments [RFC7228] [I-D.ietf-lake-reqs].  [RFC7925] defines a
   X.509 certificate profile for constrained IoT.  The certificate
   profile in [RFC7925] is defined for TLS/DTLS 1.2 but works also for
   TLS 1.3 [RFC8446] and DTLS 1.3 [I-D.ietf-tls-dtls13].  For such
   profiled IoT certificates, general purpose compression algorithms
   such as zlib are however far from optimal and the general purpose
   compression algorithms defined in
   [I-D.ietf-tls-certificate-compression] can in many cases not compress

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