A Solution Framework for Private Media in Privacy Enhanced RTP Conferencing
draft-jones-perc-private-media-framework-00

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Network Working Group                                     P. Jones (Ed.)
Internet Draft                                                 N. Ismail
Intended status: Standards Track                               D. Benham
Expires: January 6, 2016                                   Cisco Systems
                                                            July 6, 2015

      A Solution Framework for Private Media in Privacy Enhanced RTP
                               Conferencing
                draft-jones-perc-private-media-framework-00

Abstract

   This document describes a solution framework for ensuring that media
   confidentiality and integrity are maintained end-to-end within the
   context of a switched conferencing environment where media
   distribution devices are not trusted with the end-to-end media
   encryption keys.  The solution aims to build upon existing security
   mechanisms defined for the real-time transport protocol (RTP).

Status of this Memo

   This Internet-Draft is submitted to IETF in full conformance with the
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   This Internet-Draft will expire on January 6, 2016.

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   Copyright (c) 2015 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
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Jones, et al.          Expires January 6, 2016                  [Page 1]
Internet-Draft         Private Media Framework                 July 2015

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

Table of Contents

   1. Introduction...................................................2
   2. Requirements Language..........................................3
   3. Private Media Trust Model......................................3
   4. Solution Framework Overview....................................3
      4.1. End-to-End Media Privacy..................................4
      4.2. Hop-by-Hop Operations.....................................4
   5. Private Media Packet Format....................................5
   6. SRTP Cryptographic Context.....................................7
   7. Cryptographic Operations.......................................8
      7.1. Hop-by-Hop Authentication and Optional Encryption.........8
      7.2. End-to-End Media Payload Encryption and Authentication....8
         7.2.1. End-to-End Cryptographic Context Considerations......9
   8. Key Exchange..................................................10
      8.1. Session Signaling........................................10
      8.2. Negotiating SRTP Protection Profiles and Key Exchange....12
         8.2.1. Endpoint and KMF....................................12
         8.2.2. MDD and KMF.........................................14
   9. Changing Media Forwarded and EKT Field........................15
   10. To-Do List...................................................15
      10.1. What is needed to realize this Framework................15
      10.2. Other Considerations for this Framework.................16
   11. IANA Considerations..........................................16
   12. Security Considerations......................................16
   13. References...................................................16
      13.1. Normative References....................................16
      13.2. Informative References..................................17
   14. Acknowledgments..............................................18
   Authors' Addresses...............................................18

1. Introduction

   Switched conferencing is an increasingly popular model for multimedia
   conferences with multiple participants using a combination of audio,
   video, text, and other media types.  With this model, real-time media
   flows from conference participants are not mixed, transcoded,
   transrated, recomposed, or otherwise manipulated by a media
   distribution device (MDD), as might be the case with a traditional
   media server or multipoint control unit (MCU).  Instead, media flows
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