Securing the RTP Protocol Framework: Why RTP Does Not Mandate a Single Media Security Solution
draft-ietf-avt-srtp-not-mandatory-13

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Network Working Group                                       C.S. Perkins
Internet-Draft                                     University of Glasgow
Intended status: Informational                             M. Westerlund
Expires: November 07, 2013                                      Ericsson
                                                            May 06, 2013

 Securing the RTP Protocol Framework: Why RTP Does Not Mandate a Single
                        Media Security Solution
                draft-ietf-avt-srtp-not-mandatory-13.txt

Abstract

   This memo discusses the problem of securing real-time multimedia
   sessions, and explains why the Real-time Transport Protocol (RTP),
   and the associated RTP control protocol (RTCP), do not mandate a
   single media security mechanism.  Guidelines for designers and
   reviewers of future RTP extensions are provided, to ensure that
   appropriate security mechanisms are mandated, and that any such
   mechanisms are specified in a manner that conforms with the RTP
   architecture.

Status of This Memo

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   This Internet-Draft will expire on November 07, 2013.

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   Copyright (c) 2013 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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   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents

Perkins & Westerlund   Expires November 07, 2013                [Page 1]
Internet-Draft    Securing the RTP Protocol Framework           May 2013

   carefully, as they describe your rights and restrictions with respect
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   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
   2.  RTP Applications and Deployment Scenarios . . . . . . . . . .   3
   3.  RTP Media Security  . . . . . . . . . . . . . . . . . . . . .   4
   4.  RTP Session Establishment and Key Management  . . . . . . . .   4
   5.  On the Requirement for Strong Security in Framework protocols   5
   6.  Guidelines for Securing the RTP Protocol Framework  . . . . .   6
   7.  Conclusions . . . . . . . . . . . . . . . . . . . . . . . . .   7
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   10. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   8
   11. Informative References  . . . . . . . . . . . . . . . . . . .   8
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   9

1.  Introduction

   The Real-time Transport Protocol (RTP) [RFC3550] is widely used for
   voice over IP, Internet television, video conferencing, and other
   real-time and streaming media applications.  Despite this use, the
   basic RTP specification provides only limited options for media
   security, and defines no standard key exchange mechanism.  Rather, a
   number of extensions are defined that can provide confidentiality and
   authentication of RTP media streams and RTP Control Protocol (RTCP)
   messages.  Other mechanisms define key exchange protocols.  This memo
   outlines why it is appropriate that multiple extension mechanisms are
   defined rather than mandating a single security and keying mechanism
   for all users of RTP.

   The IETF policy on Strong Security Requirements for IETF Standard
   Protocols [RFC3365] (the so-called "Danvers Doctrine") states that
   "we MUST implement strong security in all protocols to provide for
   the all too frequent day when the protocol comes into widespread use
   in the global Internet".  The security mechanisms defined for use
   with RTP allow these requirements to be met.  However, since RTP is a
   protocol framework that is suitable for a wide variety of use cases,
   there is no single security mechanism that is suitable for every
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