Encrypted Key Transport for DTLS and Secure RTP
draft-ietf-perc-srtp-ekt-diet-05

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Last updated 2017-06-29
Replaces draft-jennings-perc-srtp-ekt-diet
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PERC Working Group                                           C. Jennings
Internet-Draft                                                     Cisco
Intended status: Standards Track                        J. Mattsson, Ed.
Expires: December 31, 2017                                      Ericsson
                                                               D. McGrew
                                                                 D. Wing
                                                            F. Andreasen
                                                                   Cisco
                                                           June 29, 2017

            Encrypted Key Transport for DTLS and Secure RTP
                    draft-ietf-perc-srtp-ekt-diet-05

Abstract

   Encrypted Key Transport (EKT) is an extension to DTLS and Secure
   Real-time Transport Protocol (SRTP) that provides for the secure
   transport of SRTP master keys, rollover counters, and other
   information within SRTP.  This facility enables SRTP for
   decentralized conferences by distributing a common key to all of the
   conference endpoints.

Status of This Memo

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   This Internet-Draft will expire on December 31, 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

Jennings, et al.        Expires December 31, 2017               [Page 1]
Internet-Draft                  EKT SRTP                       June 2017

   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Overview  . . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Conventions Used In This Document . . . . . . . . . . . . . .   4
   4.  Encrypted Key Transport . . . . . . . . . . . . . . . . . . .   4
     4.1.  EKT Field Formats . . . . . . . . . . . . . . . . . . . .   4
     4.2.  Packet Processing and State Machine . . . . . . . . . . .   7
       4.2.1.  Outbound Processing . . . . . . . . . . . . . . . . .   8
       4.2.2.  Inbound Processing  . . . . . . . . . . . . . . . . .   9
     4.3.  Implementation Notes  . . . . . . . . . . . . . . . . . .  10
     4.4.  Ciphers . . . . . . . . . . . . . . . . . . . . . . . . .  10
       4.4.1.  Ciphers . . . . . . . . . . . . . . . . . . . . . . .  11
       4.4.2.  Defining New EKT Ciphers  . . . . . . . . . . . . . .  12
     4.5.  Synchronizing Operation . . . . . . . . . . . . . . . . .  12
     4.6.  Transport . . . . . . . . . . . . . . . . . . . . . . . .  12
     4.7.  Timing and Reliability Consideration  . . . . . . . . . .  13
   5.  Use of EKT with DTLS-SRTP . . . . . . . . . . . . . . . . . .  13
     5.1.  DTLS-SRTP Recap . . . . . . . . . . . . . . . . . . . . .  14
     5.2.  SRTP EKT Key Transport Extensions to DTLS-SRTP  . . . . .  14
     5.3.  Offer/Answer Considerations . . . . . . . . . . . . . . .  17
     5.4.  Sending the DTLS EKT_Key Reliably . . . . . . . . . . . .  17
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  18
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  19
     7.1.  EKT Message Types . . . . . . . . . . . . . . . . . . . .  19
     7.2.  EKT Ciphers . . . . . . . . . . . . . . . . . . . . . . .  20
     7.3.  TLS Extensions  . . . . . . . . . . . . . . . . . . . . .  20
     7.4.  TLS Content Type  . . . . . . . . . . . . . . . . . . . .  21
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  21
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  21
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  21
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