Data receiving method and system of digital television

A data receiving method, digital TV technology, applied in the direction of electrical components, image communication, selective content distribution, etc., can solve problems such as potential safety hazards of data receiving

Inactive Publication Date: 2011-05-25
SHENZHEN JIUZHOU ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a data receiving method for digital TV in view of the potential safety hazards in the data reception of the above-mentioned digital TV in the prior art, which can prevent illegal acquisition of data, and then maintain the user's security. legal rights

Method used

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  • Data receiving method and system of digital television
  • Data receiving method and system of digital television
  • Data receiving method and system of digital television

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Embodiment Construction

[0064] like figure 2 As shown, in the flow chart of Embodiment 1 of the digital television data receiving method of the present invention, the method includes the following steps:

[0065] In step S201, receive and analyze the data packet from the server, the data packet includes encrypted authorization management information, encrypted authorization control information and key management information, the authorization control information is embedded with encrypted control words , the key management information includes protection key information, algorithm information, and key length information. It should be noted that encryption of authorization management information, authorization control information, and control words is performed at the server. In addition, the operation of the control word at the server is as follows: first encrypt it according to a specific encryption method (the encryption method will be described in detail in the following embodiments), and then ac...

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PUM

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Abstract

The invention discloses a data receiving method and system of a digital television. The data receiving method of the digital television comprises the following steps: receiving and analyzing a data packet coming from a server; filtering out encrypted management information, encrypted authorization control information and key management information from the analyzed data packet; decrypting the encrypted management information and the encrypted authorization control information according to the key management information; extracting encrypted control words from the decrypted authorization control information according to the decrypted authorization management information; decrypting the encrypted control words according to the key management information; and descrambling received audio-video streams according to the control words. By adopting the technical scheme, the invention has the advantages that data is prevented from being obtained illegally, the lawful right of a user is protected, the data security is high and the cost is low.

Description

technical field [0001] The invention relates to the technical field of digital television, in particular to a method and system for receiving digital television data. Background technique [0002] CAS (Conditional Access System, Conditional Access System) refers to a system used to control users to receive broadcast services, that is, users can only receive authorized broadcast services, and its purpose is to realize paid services for broadcast services through authorization management. The control of the broadcast service by the CAS is realized by scrambling the broadcast data, and only authorized users can descramble and normally receive the broadcast data, thereby receiving the broadcast service. Scrambling and descrambling are a pair of symmetrical and reversible processes, and the control word and broadcast data are transmitted to the user terminal synchronously. Therefore, the control of the broadcast service is thus translated into the protection of the scrambling co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N21/4623H04N21/4367
Inventor 袁苇
Owner SHENZHEN JIUZHOU ELECTRIC
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