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Sending secure media streams

A technology for media streaming and security, applied in electrical components, transmission systems, etc., to solve problems such as conflicts, collisions, and inability to achieve reliable context identification

Inactive Publication Date: 2011-05-18
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The above problem becomes even more pronounced and complicated when there are multiple media streams from one or more senders that should be multiplexed by intermediate nodes into a single protected stream when forwarded towards the destination
Even if intermediate nodes are configured to use each sender's original SSRC, selecting contexts based on SSRC_e2e can still lead to collisions, since they are independently and randomly selected by the original sender without needing to synchronize in any way
Even with only a small number of SSRCs, the probability of collision is non-negligible, and reliable context identification will not be achieved

Method used

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  • Sending secure media streams
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Examples

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Embodiment Construction

[0038] The intermediate node resends / forwards to the receiver at least one e2e encrypted stream from one or more senders and the hop-by-hop encrypted media accessed by the intermediate node. Introduces new identifiers and mappings that uniquely identify the context (e2e context and hop-by-hop context) of a media stream. The identifier and mapping can be used by the receiver to recover the media content, and in case of multiplexed media streams, the receiver can correctly switch between different e2e protection contexts and one or more hop-by-hop contexts.

[0039] Examples where an intermediate node may need to send several protected media streams that are multiplexed into a single session include: store-and-forward mailboxes or answering machines, caching of IPTV content for more efficient local access to content, and in IPTV applications or in VoIP Mix / switch several protected media streams in a conference.

[0040] The following terms are used in the following description....

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Abstract

A method and apparatus for sending a first secured media stream having a payload via an intermediate node. The intermediate node receives from a sender the first secured media stream. An end-to-end context identifier and a hop-by-hop context identifier are determined for the first secured media stream, where the hop-by-hop context identifier relates to the intermediate node and the end-to-end identifier relates to the sender. A second secured media stream is generated, which includes at least the payload of the first secured media stream and the context identifiers to identify the first secured media stream. The second secured media stream is sent to a receiving node, and the context identifiers are also sent to the receiving node. The context identifiers are usable by the receiving node to recover the first secured media stream.

Description

technical field [0001] The present invention relates to the field of sending secure media streams. Background technique [0002] Real-time Transport Protocol (RTP) is a protocol for transmitting audio and video media data over packet-switched networks. RTP is used to transmit real-time and streaming data such as interactive audio and video. Therefore, for applications such as IPTV, conferencing, Voice over IP (VoIP), etc. [0003] The Secure Real-time Transport Protocol (SRTP), specified in IETF RFC 3711 since March 2004, is a transport security protocol specified as an RTP profile, providing a form of encrypted RTP. In addition to encryption, it provides message integrity and replay protection in unicast, multicast and broadcast applications. SRTP is used to protect content transferred between peers in an RTP session. SRTP is only meant to protect data during transmission between two peers running SRTP. In particular, SRTP no longer protects data once it has been trans...

Claims

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Application Information

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IPC IPC(8): H04L29/06
CPCH04L29/06503H04L29/06517H04L63/0428H04L65/605H04L65/608H04L65/765H04L65/65
Inventor 罗尔夫·布洛姆成怡约翰·马特森马茨·内斯隆德卡尔·诺曼
Owner TELEFON AB LM ERICSSON (PUBL)