Network Working Group M. Westerlund
Internet-Draft Ericsson
Intended status: Informational C. Perkins
Expires: November 07, 2013 University of Glasgow
May 06, 2013
Options for Securing RTP Sessions
draft-ietf-avtcore-rtp-security-options-03
Abstract
The Real-time Transport Protocol (RTP) is used in a large number of
different application domains and environments. This heterogeneity
implies that different security mechanisms are needed to provide
services such as confidentiality, integrity and source authentication
of RTP/RTCP packets suitable for the various environments. The range
of solutions makes it difficult for RTP-based application developers
to pick the most suitable mechanism. This document provides an
overview of a number of security solutions for RTP, and gives
guidance for developers on how to choose the appropriate security
mechanism.
Status of This Memo
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This Internet-Draft will expire on November 07, 2013.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Background . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1. Point to Point Sessions . . . . . . . . . . . . . . . . . 4
2.2. Sessions Using an RTP Mixer . . . . . . . . . . . . . . . 4
2.3. Sessions Using an RTP Translator . . . . . . . . . . . . 5
2.3.1. Transport Translator (Relay) . . . . . . . . . . . . 5
2.3.2. Gateway . . . . . . . . . . . . . . . . . . . . . . . 6
2.3.3. Media Transcoder . . . . . . . . . . . . . . . . . . 7
2.4. Any Source Multicast . . . . . . . . . . . . . . . . . . 7
2.5. Source-Specific Multicast . . . . . . . . . . . . . . . . 8
3. Security Options . . . . . . . . . . . . . . . . . . . . . . 9
3.1. Secure RTP . . . . . . . . . . . . . . . . . . . . . . . 9
3.1.1. Key Management for SRTP: DTLS-SRTP . . . . . . . . . 11
3.1.2. Key Management for SRTP: MIKEY . . . . . . . . . . . 12
3.1.3. Key Management for SRTP: Security Descriptions . . . 13
3.1.4. Key Management for SRTP: Encrypted Key Transport . . 14
3.1.5. Key Management for SRTP: Other systems . . . . . . . 14
3.2. RTP Legacy Confidentiality . . . . . . . . . . . . . . . 15
3.3. IPsec . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.4. DTLS . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.5. TLS over TCP . . . . . . . . . . . . . . . . . . . . . . 16
3.6. Payload-only Security Mechanisms . . . . . . . . . . . . 16
3.6.1. ISMA Encryption and Authentication . . . . . . . . . 17
4. Securing RTP Applications . . . . . . . . . . . . . . . . . . 17
4.1. Application Requirements . . . . . . . . . . . . . . . . 17
4.1.1. Confidentiality . . . . . . . . . . . . . . . . . . . 17
4.1.2. Integrity . . . . . . . . . . . . . . . . . . . . . . 18
4.1.3. Source Authentication . . . . . . . . . . . . . . . . 19
4.1.4. Identity . . . . . . . . . . . . . . . . . . . . . . 21
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