Method for the transmission of management data

一种管理数据、数量的技术，应用在电视、模拟保密/收费系统、电气元件等方向，能够解决无法确定是否存在、周期性无法确定等问题

Inactive Publication Date: 2009-03-18
NAGRAVISION SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This way, an individual malicious user cannot determine whether there is a periodicity and thus its value

Method used

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  • Method for the transmission of management data
  • Method for the transmission of management data
  • Method for the transmission of management data

Examples

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Embodiment Construction

[0027] As mentioned earlier, access to conditional access data typically requires permission to gain access. They are transmitted to the multimedia unit in the form of authorization messages EMM. These authorization messages EMM may also contain different information for managing the multimedia unit. Such information could be, for example, software patches or means for closing security holes. In order to ensure that all users receive or in particular all users receive the messages relevant to them correctly, these messages are usually repeated several times, usually in a circular manner.

[0028] In the embodiment shown in FIGS. 1 to 3 the authorization message EMM is encrypted by a key stored in the multimedia unit called authorization key GK. According to the invention, access to these authorization messages also requires a key called the synchronization key SK. It should be noted that according to the different types of authorization messages, ie global, shared or indivi...

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Abstract

This invention relates to a method for the transmission of management data to at least one multimedia unit or a group of multimedia units. This method is characterised in that said management data is sent in the form of at least one authorisation message encrypted by means of at least one synchronisation key (SK), the sending of said at least one authorisation message being repeated cyclically and intended for said multimedia unit or said group of multimedia units, and in that the synchronisation key is modified at least during each cycle.

Description

technical field [0001] The invention relates to the field of access to conditional access data, in particular pay television. More precisely, it concerns a method of transmitting management data to at least one multimedia unit, the decryption of which data depends on the rights stored in the multimedia unit. Background technique [0002] It is known that in order to be able to access encrypted data such as information, software, games, etc., or to watch pay TV programs such as movies, sports events or especially competitions, some code streams are broadcast to a set of multimedia devices consisting of decoders and security modules in the unit. In particular, these codestreams are, on the one hand, event files in the form of encrypted data streams and, on the other hand, codestreams of control messages ECM that allow the decryption of the data streams. The content of the data stream is encrypted by a "control word" (cw) which is updated periodically. The second code stream...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/16
CPCH04N21/4623H04N21/26606H04N21/4405H04N21/63345H04N7/162H04N21/2347
Inventor 亨利·库代尔斯基约埃尔·科尼斯
Owner NAGRAVISION SA
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