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Secret key distributing method based on product and user separate packet for conditional access system

A conditional access system and user grouping technology, which is applied in the field of key distribution based on the separate grouping of products and users in the conditional access system, can solve the problems of high transmission bandwidth consumption and huge amount of calculation, and reduce the amount of calculation and transmission. The effect of reducing hardware workload

Inactive Publication Date: 2007-08-29
TSINGHUA UNIV +1
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AI Technical Summary

Problems solved by technology

[0022] The present invention proposes a key distribution method based on double grouping, which is used to overcome the shortcomings of the general authorization management structure, such as too large amount of calculation, or too high consumption of transmission bandwidth, etc.

Method used

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  • Secret key distributing method based on product and user separate packet for conditional access system
  • Secret key distributing method based on product and user separate packet for conditional access system
  • Secret key distributing method based on product and user separate packet for conditional access system

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Experimental program
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Embodiment Construction

[0056] Embodiments of the present invention can be divided into the following parts:

[0057] 1. Program grouping

[0058] In the actual program arrangement, in order to simplify the calculation and facilitate management, the programs (Channel) can be grouped in the form of packages according to the different properties of the programs (such as children's programs, adult programs, news programs, entertainment programs, etc.) , each group is called a product (Product). The minimum authorization unit of the conditional access system for end users is the product rather than the program; the same program can belong to different products at the same time; there can be inclusion relationships between different products.

[0059] ch all programs 1 、ch 2 、......ch m The set of is denoted as P 0 , namely P 0 ={ch 1 ,ch 2 ,...ch m}; At the same time, according to the actual program grouping, record different products as P j (j>0), P j is P 0 A subset of the program; the prog...

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Abstract

The key distribution method is in use for lowering amount of calculation and consumption of transmission bandwidth, raising flexibility of system. Characters are that first, front end of system groups programs to turn into product, and using orthogonal method generates vectors and cipher keys for programs and products; next, the system assigns addresses for users, and groups users, using mask controls magnitude of group, and using RSA algorithm and China's residue theorem generate cipher key of product group; using feature of variable magnitude of group (controlled by mask), and based on characters of different products (different requirements of flexibility) define different magnitudes of groups. Thus, the method gives option and balanced selection between amount of calculation and transmission bandwidth in order to realize optimized matching effect.

Description

technical field [0001] The present invention provides a key distribution method based on double grouping, which is used in the conditional access system in the digital TV copyright management, and is convenient to realize the calculation and production of the key on the server at the front end of the system; the structure can effectively control the distribution of the key The calculation amount and the occupation of the transmission bandwidth, and the balanced adjustment between the bandwidth occupation and the calculation complexity can be realized through the adjustment of the packet size, thereby improving the system flexibility. Background technique [0002] Digital rights management is an important part of the digital TV system. At present, the conditional access system is mainly used to effectively authorize and manage the viewing users. Among them, the encryption algorithm and encryption structure of the conditional access system are very important. The security lev...

Claims

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Application Information

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IPC IPC(8): H04L9/08H04L9/30H04L12/56
Inventor 王兴军秦军波
Owner TSINGHUA UNIV
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