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Digital television broadcasting conditional access system

A technology of digital TV broadcasting and conditional access system, which is applied in the field of communication, can solve problems such as digital TV broadcasting security, and achieve the effect of easy promotion and implementation

Active Publication Date: 2013-08-28
AEROSPACE INFORMATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The main purpose of the present invention is to provide a conditional access system for digital TV broadcasting. Based on the protection needs of video and audio streams when digital TV programs are transmitted on the broadcast network, personal key PK, distribution key DK, service key SK and Control word CW four-layer key system to solve security problems in digital TV broadcasting

Method used

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  • Digital television broadcasting conditional access system
  • Digital television broadcasting conditional access system
  • Digital television broadcasting conditional access system

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Embodiment Construction

[0048] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0049] The symbols used in the present invention are described as follows:

[0050] ||: link. For example, C=A∥B, which means that B is used as the low-level data of C, and A is used as the high-level data of C, and the bit length of C is the sum of the bit lengths of A and B.

[0051] E. K (X): Encrypt X with a symmetric encryption algorithm and key K.

[0052] D. K (X): Use the symmetric encryption algorithm and the key K to decrypt X.

[0053] H(X): Hash the data of X with a hash cryptographic algorithm.

[0054] h(X): h(X)=lower 128 bits of H(X).

[0055] sign K (Y): Use an asymmetric cryptographic algorithm and key K to sign Y.

[0056] refer to figure 1 , the digital television conditional access system of the present invention includes a front-end system and a terminal system, wherein,

[0057] The front-end system is mainly composed of four parts: a...

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Abstract

The invention provides a digital television broadcasting conditional access system which adopts four layers of key systems, that is to say, a personal key (PK), a distribution key (DK), a service key (SK) and a control word (CW), and solves the application security problem through control of authorization and management of the four layers of keys based on the requirement for protection of video / audio streams when digital television programs are transmitted through broadcasting networks. In addition, a cryptographic algorithm of the national proprietary intellectual property rights is used, anidentity authentication mechanism is introduced, and the digital television broadcasting conditional access system is safe, flexible and reliable and easy to promote and implement and meets needs of a national multi-stage operation mode and a user management mode based on multi-services.

Description

technical field [0001] The invention relates to the communication field, in particular to a conditional access system for digital television broadcasting. Background technique [0002] Comprehensively advancing the digitization of the radio and television system is an important development strategy to meet the growing spiritual and cultural needs of the people and promote the construction of national informatization. The development of cable and terrestrial digital TV, combined with satellite digital TV, will form a wireless broadcasting multimedia network with a single and two-way combination of seamless coverage based on large-area satellite coverage and supplemented by ground supplementary networks, covering more than 70% of the vast urban and suburban areas , home TVs and mobile TVs in rural and remote areas, TVs in public places, building TVs, etc., have greatly improved the level of urban and rural informatization in my country, improved the quality of spiritual and cul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N21/2389H04N21/266H04N21/435
Inventor 罗世新于志强
Owner AEROSPACE INFORMATION