End to End Media Encryption Procedures
draft-murillo-perc-lite-01

Document Type Active Internet-Draft (individual)
Authors Sergio Murillo  , Alexandre Gouaillard 
Last updated 2020-05-12
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Network Working Group                             S. Garcia Murillo, Ed.
Internet-Draft                                        A. Gouaillard, Ed.
Expires: November 13, 2020            CoSMo Software Consulting, Pte Ltd
                                                            May 12, 2020

                 End to End Media Encryption Procedures
                       draft-murillo-perc-lite-01

Abstract

   In some conferencing scenarios, it is desirable for an intermediary
   to be able to manipulate some RTP parameters, while still providing
   strong end-to-end security guarantees.  This document defines a
   procedure to perform end to end media authenticated encryption.

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
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   This Internet-Draft will expire on November 13, 2020.

Copyright Notice

   Copyright (c) 2020 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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   described in the Simplified BSD License.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Overview  . . . . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  Procedures at the Media Sender  . . . . . . . . . . . . . . .   3
   5.  Procedures at the Media Distributor . . . . . . . . . . . . .   4
   6.  Procedures at the Media Receiver  . . . . . . . . . . . . . .   4
   7.  Payload Encryption Header . . . . . . . . . . . . . . . . . .   4
   8.  RTX/RED/FEC procedures  . . . . . . . . . . . . . . . . . . .   5
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   5
     9.2.  Informative References  . . . . . . . . . . . . . . . . .   6
   Appendix A.  Change Log . . . . . . . . . . . . . . . . . . . . .   7
   Appendix B.  Open Issues  . . . . . . . . . . . . . . . . . . . .   7
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Introduction

   RTP-based real-time multi-party interactive media conferencing is in
   widespread use today.  Many of the deployments use one or more
   centrally located media distribution devices that perform selective
   forwarding of mixed-media streams received from the participating
   endpoints.

   These conferences require security to ensure that the RTP media and
   related metadata of the conference is kept private and only available
   to the set of invited participants and other devices trusted by those
   participants with their media.  At the same time, multi-party media
   conferences need source authentication and integrity checks to
   protect against modifications, insertions, and replay attacks.

   To date, deployment models for these multi-party media distribution
   devices do not enable the devices to perform their functions without
   having keys to decrypt the participants' media.  This trust model has
   limitations and prevents or hampers deployment of secure RTP
   conferencing in a multitude of cases, including outsourcing, legal
   requirements on confidentiality, and utilization of virtualized
   servers.

   This specification defines an End to End Media Encryption procedure,
   so the media distribution devices can perform their media
   distribution function but without having access to the participant
   media, while focusing on introducing the minimun amount of changes on
   both the endpoints and the media distributor.

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2.  Terminology

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
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