An Opportunistic Approach for Secure Real-time Transport Protocol (OSRTP)
draft-ietf-sipbrandy-osrtp-10

Document Type Active Internet-Draft (sipbrandy WG)
Last updated 2019-06-17
Stream IETF
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SIPBRANDY Working Group                                      A. Johnston
Internet-Draft                                      Villanova University
Intended status: Informational                                  B. Aboba
Expires: December 19, 2019                                     Microsoft
                                                               A. Hutton
                                                                    Atos
                                                               R. Jesske
                                                        Deutsche Telekom
                                                                T. Stach
                                                            Unaffiliated
                                                           June 17, 2019

   An Opportunistic Approach for Secure Real-time Transport Protocol
                                (OSRTP)
                     draft-ietf-sipbrandy-osrtp-10

Abstract

   Opportunistic Secure Real-time Transport Protocol (OSRTP) is an
   implementation of the Opportunistic Security mechanism, as defined in
   RFC 7435, applied to the Real-time Transport Protocol (RTP).  OSRTP
   allows encrypted media to be used in environments where support for
   encryption is not known in advance, and not required.  OSRTP does not
   require Session Description Protocol (SDP) extensions or features and
   is fully backwards compatible with existing implementations using
   encrypted and authenticated media and implementations that do not
   encrypt or authenticate media packets.  OSRTP is not specific to any
   key management technique for Secure RTP (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

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   provisions of BCP 78 and BCP 79.

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Johnston, et al.        Expires December 19, 2019               [Page 1]
Internet-Draft                    OSRTP                        June 2019

   This Internet-Draft will expire on December 19, 2019.

Copyright Notice

   Copyright (c) 2019 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
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
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   include Simplified BSD License text as described in Section 4.e of
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Applicability Statement . . . . . . . . . . . . . . . . .   3
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   3
   3.  SDP Offer/Answer Considerations . . . . . . . . . . . . . . .   3
     3.1.  Generating the Initial OSRTP Offer  . . . . . . . . . . .   4
     3.2.  Generating the Answer . . . . . . . . . . . . . . . . . .   4
     3.3.  Offerer Processing the Answer . . . . . . . . . . . . . .   4
     3.4.  Modifying the Session . . . . . . . . . . . . . . . . . .   5
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   6
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   6
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   7
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   8

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
   of media to be used if supported but will not result in failures if
   it is not supported.  In the context of the transport of secure media
   streams using RTP and is secured derivatives, cleartext is
   represented by an RTP [RFC3550] media stream which is negotiated with
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