Transport Layer Security (TLS) Certificate Compression
draft-ghedini-tls-certificate-compression-00

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Network Working Group                                         A. Ghedini
Internet-Draft                                          Cloudflare, Inc.
Intended status: Standards Track                             V. Vasiliev
Expires: September 2, 2017                                        Google
                                                          March 01, 2017

         Transport Layer Security (TLS) Certificate Compression
              draft-ghedini-tls-certificate-compression-00

Abstract

   In Transport Layer Security (TLS) handshakes, certificate chains
   often take up the majority of the bytes transmitted.

   This document describes how certificate chains can be compressed to
   reduce the amount of data transmitted and avoid some round trips.

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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   This Internet-Draft will expire on September 2, 2017.

Copyright Notice

   Copyright (c) 2017 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
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of

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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Notational Conventions  . . . . . . . . . . . . . . . . . . .   2
   3.  Negotiating Certificate Compression . . . . . . . . . . . . .   2
   4.  Server Certificate Message  . . . . . . . . . . . . . . . . .   3
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
     6.1.  Update of the TLS ExtensionType Registry  . . . . . . . .   4
     6.2.  Registry for Compression Algorithms . . . . . . . . . . .   5
   7.  Normative References  . . . . . . . . . . . . . . . . . . . .   5
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   In order to reduce latency and improve performance it can be useful
   to reduce the amount of data exchanged during a Transport Layer
   Security (TLS) handshake.

   [RFC7924] describes a mechanism that allows a client and a server to
   avoid transmitting certificates already shared in an earlier
   handshake, but it doesn't help when the client connects to a server
   for the first time and doesn't already have knowledge of the server's
   certificate chain.

   This document describes a mechanism that would allow server
   certificates to be compressed during full handshakes.

2.  Notational Conventions

   The words "MUST", "MUST NOT", "SHALL", "SHOULD", and "MAY" are used
   in this document.  It's not shouting; when they are capitalized, they
   have the special meaning defined in [RFC2119].

3.  Negotiating Certificate Compression

   This document defines a new extension type
   (compress_server_certificates(TBD)), which is used by the client and
   the server to negotiate the use of compression for the server
   certificate chain, as well as the choice of the compression
   algorithm.

   By sending the compress_server_certificates message, the client
   indicates to the server the certificate compression algorithms it

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   supports.  The "extension_data" field of this extension in the
   ClientHello SHALL contain a CertificateCompressionAlgorithms value:
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