Method implementing conditional reception and conditional receiving apparatus

A conditional access and terminal technology, applied in the direction of broadcasting devices, electrical components, broadcasting system control, etc., can solve the problems of CA system damage, CA system cracking, illegal eavesdropping of control words, etc., and achieve the effect of ensuring security

Inactive Publication Date: 2008-12-31
INNOFIDEI TECHNOLOGIES INC
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Problems solved by technology

However, once the descrambling module is separated from the CAM-C in physical location, the interface between the descrambling module and the CAM-C is exposed to eavesdroppers, and the control words passed on the interface may be illegally eavesdropped, which will Serious damage to the entire CA system, even causing the CA system to be cracked

Method used

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  • Method implementing conditional reception and conditional receiving apparatus
  • Method implementing conditional reception and conditional receiving apparatus
  • Method implementing conditional reception and conditional receiving apparatus

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Embodiment Construction

[0051] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

[0052] The main idea of ​​the present invention is to encrypt and transmit the control word between the CAM-C and the descrambling module, so that: on the one hand, the CAM-C can normally and independently complete the conditional access function; It is passed to the descrambling module, thereby ensuring the security of the conditional access system while realizing the conditional access function.

[0053] figure 2 It is a schematic flowchart of the method for realizing conditional access in the present invention. see figure 2 , the method includes:

[0054] Step 201: the terminal sends the obtained user key, EMM and ECM to CAM-C;

[0055] Step 202: CAM-C obtains a control word according to the user key, EMM and ECM, encrypts the control word and ...

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Abstract

The invention discloses a method of realizing conditional access. The method includes the following steps: a terminal sends an acquired user key, an entitlement management message (EMM) and an entitlement control message (ECM) to a Conditional Access Module-Card (CAM-C); the CAM-C acquires a control word according to the user key, EMM and ECM, and sends the encrypted control word to the terminal after encrypting the control word; the terminal decrypts the encrypted control word to acquire the control word, and carries out descramble to the received scrambled multimedia program data according to the control word to obtain the multimedia program data. The invention also discloses a conditional access device. The use of the invention can realize the function of conditional access, and ensure the safety of conditional access system.

Description

technical field [0001] The invention relates to mobile multimedia broadcasting technology, in particular to a method and a conditional access device for realizing conditional access. Background technique [0002] In the mobile multimedia broadcasting system, multimedia programs are delivered to terminals in the form of broadcasting. For paid multimedia programs, in order to protect the interests of service providers, the terminal is required to have the conditional access function, that is, the paid multimedia program data will be scrambled and transmitted by the conditional access (CA, Conditional Access) system, and the terminal must first successfully descramble the multimedia program. The program data can be watched normally. [0003] figure 1 A schematic diagram of the composition and structure of an existing conditional access terminal is shown. see figure 1 , the shown conditional access terminal includes: a demodulation / demultiplexing module, a bidirectional inte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04H60/15H04H60/23
Inventor 张辉王西强李向阳杨君云孙家旺
Owner INNOFIDEI TECHNOLOGIES INC
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