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Two-way CA system of digital TV-set and method for ordering and cancelling programm based on it

A digital TV and program technology, applied in two-way work system, analog security/charging system, user identity/authority verification, etc., can solve problems such as waste of system resources, waste of resources, failure to receive shutdown information, etc., to improve security Sex, achieve complementary, smooth switching effect

Active Publication Date: 2007-11-21
上海云视科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] There are following major defects in this traditional CA system: (1) cause huge waste of resources
In order to ensure that users can receive the ordered services immediately, in a one-way network, these EMMs must be sent repeatedly in the network according to a certain period and sending frequency, resulting in a huge waste of system processing capacity and network bandwidth.
(2) There is a lack of effective control of user equipment, and there are certain problems in the CA system shutting down the set-top box
There is a problem here: when the CA system sends a shutdown message to the set-top box, if the set-top box is in the off state, that is, the set-top box does not receive the shutdown message, the user can still watch the program when the user turns on the next time
The current solution is to send shutdown information to the set-top box again after a period of time, which will cause a waste of system resources, and even this still cannot guarantee to shut down all the set-top boxes that are in arrears

Method used

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  • Two-way CA system of digital TV-set and method for ordering and cancelling programm based on it
  • Two-way CA system of digital TV-set and method for ordering and cancelling programm based on it

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Embodiment Construction

[0046] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0047] Fig. 1 shows the principle of a preferred embodiment of the two-way CA system of the present invention. Referring to Fig. 1, the two-way CA system 1 positioned at the front end includes: BiCAS subsystem (i.e. two-way conditional access subsystem) 10, user management subsystem (SMS, Subscriber Management Server) 20, authentication server (LS, LicenseServer) 30, password Keystore 50 , decryption machine (DS, Decryption Server) 70 , EMM (Authorization Management Information) database 60 and RPPS server (Return Path Pool Server, Return Path Server) 40 . BiCAS subsystem 10 further comprises: user management system network management (SMSGW, namely SMS Gateway) 11, user authorization server (SAS, Subscriber Authorization Server) 12, encryption machine (ES, Encryption Server) 13, and IEMM generation module (IEMMG, Interactive EMM Generator)14. The use...

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PUM

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Abstract

The invention is used for providing a security authentication between the content provider, network service supplier and users in digital TV system. The method comprises: based on the active authentication of client side, a bidirectional authentication is adopted in order to realize the one-time-pad in the authentication process; said authentication information is encrypted with public key in the smart card of set-top box, and the encrypted authentication information is decrypted with private key in the front end authentication server.

Description

technical field [0001] The invention relates to a CA authorization system in the field of digital television and a method for ordering and canceling television programs based on the authorization system, in particular to a two-way conditional access system based on client active authentication in digital television and a two-way conditional access system based on the two-way A method for ordering and canceling programs of a conditional access system. Background technique [0002] In the field of digital TV, the traditional CA authorization system (conditional access system) ensures that users can legally watch encrypted pay TV programs provided by TV station operators through a one-way cable network. [0003] Traditional CA systems generally use triple keys or multi-layer keys to scramble the original data stream. The triple key is generally: scrambling control word (CW), service key (SK) and user distribution key (PDK). The control word (CW) controls the scrambler to scra...

Claims

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Application Information

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IPC IPC(8): H04N7/16H04N7/173H04L9/32
Inventor PIN CHEN LV
Owner 上海云视科技股份有限公司
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