Condition access chip of digital television and realization method of condition access
A conditional access and digital TV technology, applied in electrical components, image communication, selective content distribution, etc., can solve the problems of waste of resources, increase the difficulty of system design, etc., and achieve the effect of improving security performance
Active Publication Date: 2015-04-15
SHENZHEN STATE MICRO TECH CO LTD
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Problems solved by technology
This approach is easy to understand, but there are the following problems in the implementation process: First, an independent safe operating environment must be built for the central processing unit responsible for decrypting the control word, so as to isolate it from the central processing unit in the system, and an auxiliary security control module needs to be added , such as the encryption and decryption unit of the program, etc., which increases the difficulty of system design; secondly, resources are relatively wasteful
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[0037] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0038] Such as figure 1 As shown, the present invention proposes a conditional access chip 1 used in a digital television conditional access system, including: a central processing unit 11 for operating control and resource allocation to the conditional access chip 1, which is the control center of the conditional access chip 1 , is also the only code execution unit in the conditional access chip 1; DMA (Direct Memory Access, direct memory access) controller 12 can only read the storage content in the non-volatile memory 13, and can only write data to The control word decryption module 15; the non-volatile memory 13 is used to store the decryption root key needed for the control word decryption operation, the security configuration information initialized to the storage protection unit 14, the task linked list of the DMA controller 12...
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The invention discloses a condition access chip of a digital television and a realization method of condition access. The condition access chip comprises a central processing unit, a transmission flow processor, a nonvolatile memory and a control word decryption module; a DMA (Direct Memory Access) controller is used for controlling the control word decryption module to finish decryption operation on a control word according to a task chain table which is stored in the nonvolatile memory; and a storage protection unit is used for carrying out safety configuration according to configuration information obtained by the DMA controller from the nonvolatile memory, and then protecting a bus address interval of the chip through constructing a safety island. According to the invention, through constructing the safety island and configuring the task chain table of the DMA controller, an attacker cannot execute an illegal task chain table by the DMA controller to attack the condition access chip, thereby improving the safety performance of the condition access of the digital television.
Description
technical field [0001] The invention relates to digital TV conditional access, in particular to a digital TV receiving chip for conditional access and a method for realizing digital TV conditional access. Background technique [0002] With the development of digital TV transmission technology, digital and networked broadcast TV technology is developing rapidly in the world. The comprehensive information interactive system based on the broadcast TV system has the advantages of high transmission quality, wide range, many users and high speed. Make digital broadcasting TV has the market prospect of broadcasting. Due to the above characteristics and advantages of the digital TV system, its security requirements have both similarities and differences with other electronic information systems. How to ensure the security of the entire digital TV broadcasting system requires data security, safe access control, and user security. management and other measures. [0003] Conditional ...
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IPC IPC(8): H04N21/266H04N21/4623H04N21/434
Inventor 刘华预王良清陶玉茂
Owner SHENZHEN STATE MICRO TECH CO LTD