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Method of real-time downloading CAS core algorithm

A core algorithm and virtual machine technology, applied to color TV parts, TV system parts, TVs, etc., can solve the problems of easy piracy of set-top boxes and increased costs, and reduce the problem of upgrade failure, small data volume, fast download effect

Inactive Publication Date: 2009-11-18
金亚科技股份有限公司
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AI Technical Summary

Problems solved by technology

The CA system in this mode cannot frequently update the CAS core algorithm for security reasons
[0006] The second way is the non-card CA manufacturer. The non-card CA completely uses the program algorithm buil

Method used

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  • Method of real-time downloading CAS core algorithm
  • Method of real-time downloading CAS core algorithm

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Embodiment Construction

[0021] The present invention will be further elaborated below in conjunction with the accompanying drawings.

[0022] A method for real-time downloading of the CAS core algorithm, carried out according to steps 6 to 10:

[0023] Step 6, run a CAS front-end virtual machine task in the digital TV conditional access system CAS software, save in the CAS database after developing the encryption program with the virtual machine code development tool, the virtual machine code of the CAS encryption program runs on the front-end virtual machine of the CAS middle;

[0024] Step 7, import the CAS database with the virtual machine code of the decryption program in the CAS developed by the virtual machine code development tool;

[0025] Step 8. When updating the CAS core algorithm, all set-top boxes need to download the CAS core algorithm, as follows figure 1 As shown, the CAS front-end decryption program is sent: the virtual machine code of the decryption program is packaged into a data...

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Abstract

The invention discloses a method of real-time downloading CAS core algorithm, which comprises the following steps: a front-end virtual machine task is operated in CAS software of conditional access system (CAS) of a digital TV; a virtual machine code of encryption procedure and a virtual machine code of decryption procedure are input into CAS database; the virtual machine code of decryption is sent to a scrambling in the form of EMM data and transmitted to set-top box of users by transport network of the digital TV after modulated by QAM; a terminal virtual machine of CAS in the set-top box is started together with the start of the top box; the virtual machine code of decryption procedure is received by CAM of the set-top box and operated in CAS terminal virtual machine in the set-top box. The invention overcomes the disadvantages that upgrading of the set-top box is not in success, and upgrading of CAS core algorithm can not be realized frequently in prior art, and provides a algorithm with small data transport volume, rapid downloading algorithm, little failure in upgrading of the set-top box and frequent upgrading of CAS core algorithm, which can be applicable to digital TVs.

Description

technical field [0001] The invention relates to a transmission method of a television signal encryption and decryption algorithm, in particular to a real-time download method of a CAS core algorithm. Background technique [0002] Digital TV is a kind of all-digital processing process that converts traditional analog TV signals into digital signals represented by binary numbers through sampling, quantization and encoding, and then performs various functional processing, transmission, recording, storage, monitoring and control. end-to-end system. This all-digital feature enables us to use various digital technologies to enable TV equipment to obtain higher technical performance than the original analog TV equipment. At the same time, it also has functions that cannot be realized by analog equipment. This feature also makes conditional access in It becomes easy to implement while improving the service quality and security performance in the digital TV system. [0003] Conditi...

Claims

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Application Information

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IPC IPC(8): H04N7/16H04N5/00H04N21/435H04N21/458
Inventor 唐文东周旭辉
Owner 金亚科技股份有限公司
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