An Opportunistic Approach for Secure Real-time Transport Protocol (OSRTP)
draft-ietf-sipbrandy-osrtp-01

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Last updated 2016-10-30
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SIPBRANDY Working Group                                      A. Johnston
Internet-Draft                                              Unaffiliated
Intended status: Standards Track                                B. Aboba
Expires: May 3, 2017                                           Microsoft
                                                               A. Hutton
                                                                   Unify
                                                               R. Jesske
                                                        Deutsche Telekom
                                                                T. Stach
                                                            Unaffiliated
                                                        October 30, 2016

   An Opportunistic Approach for Secure Real-time Transport Protocol
                                (OSRTP)
                     draft-ietf-sipbrandy-osrtp-01

Abstract

   Opportunistic Secure Real-time Transport Protocol (OSRTP) allows
   encrypted media to be used in environments where support for
   encryption is not known in advance, and not required.  OSRTP is an
   implementation of Opportunistic Security, as defined in RFC 7435.
   OSRTP does not require advanced SDP extensions or features and is
   fully backwards compatible with existing secure and insecure
   implementations.  OSRTP is not specific to any key management
   technique for SRTP.  OSRTP is a transitional approach useful for
   migrating existing deployments of real-time communications to a fully
   encrypted and authenticated state.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on May 3, 2017.

Johnston, et al.           Expires May 3, 2017                  [Page 1]
Internet-Draft                    OSRTP                     October 2016

Copyright Notice

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   document authors.  All rights reserved.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Applicability Statement . . . . . . . . . . . . . . . . .   3
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   3
   3.  Definition of Opportunistic Security for SRTP . . . . . . . .   3
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   5.  Implementation Status . . . . . . . . . . . . . . . . . . . .   5
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   5
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   5
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   7
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Introduction

   Opportunistic Security [RFC7435] (OS) is an approach to security that
   defines a third mode for security between "cleartext" and
   "comprehensive protection" that allows encryption and authentication
   to be used if supported but will not result in failures if it is not
   supported.  In terms of secure media, cleartext is RTP [RFC3550]
   media which is negotiated with the AVP (Audio Video Profile) profile
   defined [RFC3551].  Comprehensive protection is Secure RTP [RFC3711],
   negotiated with a secure profile, such as SAVP or SAVPF [RFC5124].
   OSRTP allows SRTP to be negotiated with the AVP profile, with
   fallback to RTP if SRTP is not supported.

   There have been some extensions to SDP to allow profiles to be
   negotiated such as SDP Capabilities Negotiation (capneg) [RFC5939] .
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