Encrypted Key Transport for Secure RTP
draft-ietf-perc-srtp-ekt-diet-03

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Last updated 2017-03-13
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: September 14, 2017                                     Ericsson
                                                               D. McGrew
                                                                 D. Wing
                                                            F. Andreasen
                                                                   Cisco
                                                          March 13, 2017

                 Encrypted Key Transport for Secure RTP
                    draft-ietf-perc-srtp-ekt-diet-03

Abstract

   Encrypted Key Transport (EKT) is an extension to 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 September 14, 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

Jennings, et al.       Expires September 14, 2017               [Page 1]
Internet-Draft                  EKT SRTP                      March 2017

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

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Conventions Used In This Document . . . . . . . . . . . .   3
   2.  Encrypted Key Transport . . . . . . . . . . . . . . . . . . .   3
     2.1.  EKT Field Formats . . . . . . . . . . . . . . . . . . . .   4
     2.2.  Packet Processing and State Machine . . . . . . . . . . .   6
       2.2.1.  Outbound Processing . . . . . . . . . . . . . . . . .   7
       2.2.2.  Inbound Processing  . . . . . . . . . . . . . . . . .   8
     2.3.  Implementation Notes  . . . . . . . . . . . . . . . . . .   9
     2.4.  Ciphers . . . . . . . . . . . . . . . . . . . . . . . . .   9
       2.4.1.  Ciphers . . . . . . . . . . . . . . . . . . . . . . .  10
       2.4.2.  Defining New EKT Ciphers  . . . . . . . . . . . . . .  11
     2.5.  Synchronizing Operation . . . . . . . . . . . . . . . . .  11
     2.6.  Transport . . . . . . . . . . . . . . . . . . . . . . . .  11
     2.7.  Timing and Reliability Consideration  . . . . . . . . . .  11
   3.  Use of EKT with DTLS-SRTP . . . . . . . . . . . . . . . . . .  12
     3.1.  DTLS-SRTP Recap . . . . . . . . . . . . . . . . . . . . .  12
     3.2.  SRTP EKT Key Transport Extensions to DTLS-SRTP  . . . . .  13
     3.3.  Offer/Answer Considerations . . . . . . . . . . . . . . .  15
     3.4.  Sending the DTLS EKT_Key Reliably . . . . . . . . . . . .  15
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .  15
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  17
     5.1.  EKT Message Types . . . . . . . . . . . . . . . . . . . .  17
     5.2.  EKT Ciphers . . . . . . . . . . . . . . . . . . . . . . .  18
     5.3.  TLS Extensions  . . . . . . . . . . . . . . . . . . . . .  18
     5.4.  TLS Content Type  . . . . . . . . . . . . . . . . . . . .  18
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  19
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  19
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .  19
     7.2.  Informative References  . . . . . . . . . . . . . . . . .  20
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  20
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