Transport Layer Security (TLS) Cached Information Extension
draft-ietf-tls-cached-info-15

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Document Type Active Internet-Draft (tls WG)
Last updated 2013-10-17
Replaces draft-santesson-tls-certcache
Stream IETF
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TLS                                                         S. Santesson
Internet-Draft                                           3xA Security AB
Intended status: Standards Track                           H. Tschofenig
Expires: April 20, 2014                     Nokia Solutions and Networks
                                                        October 17, 2013

      Transport Layer Security (TLS) Cached Information Extension
                   draft-ietf-tls-cached-info-15.txt

Abstract

   Transport Layer Security (TLS) handshakes often include fairly static
   information, such as the server certificate and a list of trusted
   Certification Authorities (CAs).  This information can be of
   considerable size, particularly if the server certificate is bundled
   with a complete certificate path (including all intermediary
   certificates up to the trust anchor public key).

   This document defines an extension that omits the exchange of already
   available information.  The TLS client informs a server of cached
   information, for example from a previous TLS handshake, allowing the
   server to omit the already available information.

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 April 20, 2014.

Copyright Notice

   Copyright (c) 2013 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

Santesson & Tschofenig   Expires April 20, 2014                 [Page 1]
Internet-Draft      TLS Cached Information Extension        October 2013

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Cached Information Extension  . . . . . . . . . . . . . . . .   3
   4.  Exchange Specification  . . . . . . . . . . . . . . . . . . .   4
     4.1.  Omitting the Certificate Chain  . . . . . . . . . . . . .   5
     4.2.  Omitting the Trusted CAs  . . . . . . . . . . . . . . . .   6
   5.  Example . . . . . . . . . . . . . . . . . . . . . . . . . . .   6
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
     7.1.  New Entry to the TLS ExtensionType Registry . . . . . . .   8
     7.2.  New Registry for CachedInformationType  . . . . . . . . .   8
   8.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   9
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   9
     9.2.  Informative References  . . . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

1.  Introduction

   Transport Layer Security (TLS) handshakes often include fairly static
   information, such as the server certificate and a list of trusted
   Certification Authorities (CAs).  This information can be of
   considerable size, particularly if the server certificate is bundled
   with a complete certificate path (including all intermediary
   certificates up to the trust anchor public key).

   Optimizing the exchange of information to a minimum helps to improve
   performance in environments where devices are connected to a network
   with characteristics like low bandwidth, high latency and high loss
   rate.  These types of networks exist, for example, when smart objects
   are connected using a low power IEEE 802.15.4 radio.  For more
   information about the challenges with smart object deployments please
   see [RFC6574].

   This specification defines a TLS extension that allows a client and a
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