Secret key distributing method based on product and user separate packet for conditional access system
Title：
Secret key distributing method based on product and user separate packet for conditional access system
Application Number：
 200710063494
Application Date：
 2007/02/02
Announcement Date：
 2007/08/29
Pub. Date：
Publication Number：
 101026451
Announcement Number：
Grant Date：
Granted Pub. Date：
ApplicationType：
 Invention
State/Country：
 11[China|beijing]
IPC：
 H04L 9/08H04L 9/30H04L 12/56
Applicant(s)：
 Tsinghua Univ.
Inventor(s)：
 Wang Xingjun, Qin Junbo
Key Words：
 Secret key, distributing method, product, user, conditional access system
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.
Claim：
Priority：
PCT：
LegalStatus：

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