An Opportunistic Approach for Secure Real-time Transport Protocol (OSRTP)
draft-ietf-sipbrandy-osrtp-03
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SIPBRANDY Working Group A. Johnston
Internet-Draft Rowan University
Intended status: Informational B. Aboba
Expires: March 22, 2018 Microsoft
A. Hutton
Unify / Atos
R. Jesske
Deutsche Telekom
T. Stach
Unaffiliated
September 18, 2017
An Opportunistic Approach for Secure Real-time Transport Protocol
(OSRTP)
draft-ietf-sipbrandy-osrtp-03
Abstract
Opportunistic Secure Real-time Transport Protocol (OSRTP) is an
implementation of the Opportunistic Security mechanism, as defined in
RFC 7435, applied to 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 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
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
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on March 22, 2018.
Johnston, et al. Expires March 22, 2018 [Page 1]
Internet-Draft OSRTP September 2017
Copyright Notice
Copyright (c) 2017 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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described in the Simplified BSD License.
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 RTP/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 RTP/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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