TLS/DTLS PSK Identity Extension
draft-jay-tls-psk-identity-extension-02

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Last updated 2016-12-16
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TLS Working Group                                            J Kuppannan
INTERNET-DRAFT                                                   Juniper
Intended Status: Standard Track                                  R Ashok
Expires: June 15, 2017                                            Huawei
                                                       December 15, 2016

                    TLS/DTLS PSK Identity Extension 
                draft-jay-tls-psk-identity-extension-02

Abstract

   Pre-Shared Key (PSK) based Key Exchange Mechanism is primarily used
   in constrained environments where resource intensive Asymmetric
   Cryptography cannot be used. In the Internet of Things (IoT)
   deployments, constrained devices are commonly used for collecting
   data via sensors for use in home automation, smart energy etc. In
   this context, DTLS is being considered as the primary protocol for
   communication security at the application layer and in some cases, it
   is also being considered for network access authentication.

   This document provides a specification for a new extension for
   Optimizing DTLS and TLS Handshake when the Pre-Shared Key (PSK) based
   Key Exchange is used. This extension is aimed at reducing the number
   of messages exchanged and the RTT of the TLS & DTLS Handshakes.

Status of this Memo

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J Kuppannan & R Ashok    Expires June 15, 2017                  [Page 1]
INTERNET DRAFT      TLS/DTLS PSK Identity Extension    December 15, 2016

Copyright and License Notice

   Copyright (c) 2016 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
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   include Simplified BSD License text as described in Section 4.e of
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   described in the Simplified BSD License.

Table of Contents

   1  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.1  Applicability Statement . . . . . . . . . . . . . . . . . .  3
     1.2  Terminology . . . . . . . . . . . . . . . . . . . . . . . .  3
   2  PSK based (D)TLS Handshake  . . . . . . . . . . . . . . . . . .  4
   3  Existing Mechanism of [D]TLS Cipher Negotiation . . . . . . . .  4
   4  Drawbacks in existing PSK handshake . . . . . . . . . . . . . .  5
     4.1  Drawback in existing PSK Cipher Negotiation . . . . . . . .  5
     4.2  Scope of reducing RTT in PSK handshake  . . . . . . . . . .  6
   5 Optimized PSK handshake  . . . . . . . . . . . . . . . . . . . .  6
     5.1 PSKIdentityExtention Type  . . . . . . . . . . . . . . . . .  6
     5.2 PSK Identity Extension Data Specification  . . . . . . . . .  6
     5.3 Abbreviated Handshake  . . . . . . . . . . . . . . . . . . .  8
     5.4 Benefits of Abbreviated Handshake  . . . . . . . . . . . . .  8
   6  Security Considerations . . . . . . . . . . . . . . . . . . . .  9
     6.1 Identity Privacy . . . . . . . . . . . . . . . . . . . . . .  9
   7  IANA Considerations . . . . . . . . . . . . . . . . . . . . . .  9
   8  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . .  9
   9  References  . . . . . . . . . . . . . . . . . . . . . . . . . .  9
     9.1  Normative References  . . . . . . . . . . . . . . . . . . .  9
     9.2  Informative References  . . . . . . . . . . . . . . . . . . 10
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 10

 

J Kuppannan & R Ashok    Expires June 15, 2017                  [Page 2]
INTERNET DRAFT      TLS/DTLS PSK Identity Extension    December 15, 2016

1  Introduction

   RFC 4279 describes the usage of Pre-Shared Key (PSK) based Cipher
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