Connection Identifiers for DTLS 1.2
draft-ietf-tls-dtls-connection-id-05

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TLS                                                     E. Rescorla, Ed.
Internet-Draft                                                RTFM, Inc.
Updates: 6347 (if approved)                           H. Tschofenig, Ed.
Intended status: Standards Track                              T. Fossati
Expires: November 7, 2019                                    Arm Limited
                                                            May 06, 2019

                  Connection Identifiers for DTLS 1.2
                  draft-ietf-tls-dtls-connection-id-05

Abstract

   This document specifies the Connection ID (CID) construct for the
   Datagram Transport Layer Security (DTLS) protocol version 1.2.

   A CID is an identifier carried in the record layer header that gives
   the recipient additional information for selecting the appropriate
   security association.  In "classical" DTLS, selecting a security
   association of an incoming DTLS record is accomplished with the help
   of the 5-tuple.  If the source IP address and/or source port changes
   during the lifetime of an ongoing DTLS session then the receiver will
   be unable to locate the correct security context.

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
   Task Force (IETF).  Note that other groups may also distribute
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   Drafts is at https://datatracker.ietf.org/drafts/current/.

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   This Internet-Draft will expire on November 7, 2019.

Copyright Notice

   Copyright (c) 2019 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

Rescorla, et al.        Expires November 7, 2019                [Page 1]
Internet-Draft           DTLS 1.2 Connection ID                 May 2019

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   than English.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions and Terminology . . . . . . . . . . . . . . . . .   3
   3.  The "connection_id" Extension . . . . . . . . . . . . . . . .   3
   4.  Record Layer Extensions . . . . . . . . . . . . . . . . . . .   5
   5.  Record Payload Protection . . . . . . . . . . . . . . . . . .   7
     5.1.  Block Ciphers . . . . . . . . . . . . . . . . . . . . . .   7
     5.2.  Block Ciphers with Encrypt-then-MAC processing  . . . . .   7
     5.3.  AEAD Ciphers  . . . . . . . . . . . . . . . . . . . . . .   8
   6.  Examples  . . . . . . . . . . . . . . . . . . . . . . . . . .   8
   7.  Security and Privacy Considerations . . . . . . . . . . . . .  10
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  10
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  11
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  11
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  11
   Appendix A.  History  . . . . . . . . . . . . . . . . . . . . . .  13
   Appendix B.  Working Group Information  . . . . . . . . . . . . .  14
   Appendix C.  Contributors . . . . . . . . . . . . . . . . . . . .  14
   Appendix D.  Acknowledgements . . . . . . . . . . . . . . . . . .  15
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  15

1.  Introduction

   The Datagram Transport Layer Security (DTLS) protocol was designed
   for securing connection-less transports, like UDP.  DTLS, like TLS,