A method and device for demultiplexing

A technology of demultiplexing and decryption algorithm, which is applied in the field of general scrambling algorithm 3 decryption, and can solve problems such as weak descrambling performance

Active Publication Date: 2020-10-27
SANECHIPS TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Compared with CSA2, CSA3 has become a more popular encryption and decryption method in the field of set-top boxes because of its good encryption and decryption performance. CSA3 can descramble 128bit data at a time, and the key length is 128bit, while CSA2 can only descramble 64bit data at a time. The key length is 64bit, and the descrambling performance is weaker than CSA3

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  • A method and device for demultiplexing

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Embodiment Construction

[0065] In order to understand the characteristics and technical contents of the embodiments of the present invention in more detail, the implementation of the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. The attached drawings are only for reference and description, and are not intended to limit the embodiments of the present invention.

[0066] figure 2 It is a schematic flow chart of the demultiplexing method of the embodiment of the present invention, such as figure 2 As shown, the demultiplexing method includes the following steps:

[0067] Step 201: Process the input 2 channels of memory data and 2 channels of digital video broadcasting data, and output 2 channels of TS data streams.

[0068] In the embodiment of the present invention, the processing of the input 2-way memory data and 2-way digital video broadcast data, and outputting 2-way transport stream TS data streams include:

[0069] Accord...

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Abstract

The invention discloses a demultiplexing method and device. The method comprises the steps of processing two paths of memory data and two paths of digital video broadcast data that are input, and outputting two paths of transport stream (TS) data stream; processing the two paths of TS data stream as follows: TS package head parse, TS package digital television PID filter, program clock reference (PCR) recovery, and then outputting 64 paths of PID channel data; and performing 16 paths of parallel descrambling on the 64 paths of PID channel data, then building an index for the descrambled data,and outputting index data and TS data.

Description

technical field [0001] The present invention relates to a common scrambling algorithm (CSA, Common Scrambling Algorithm) 3 decryption technology, in particular to a demultiplexing method and device based on the CSA3 decryption technology. Background technique [0002] With the rapid development of information technology, network technology, and smart devices, content providers are increasingly paying attention to the protection of intellectual property rights. Only charging users can motivate suppliers to provide better services, so as to ensure that users enjoy high-quality services. Ultimately, both suppliers and users benefit. Therefore, the content is often encrypted in some way at the data sending end, and the corresponding receiving end also needs to decrypt the content. CSA2 is an encryption and decryption technology, figure 1 The structure diagram of CSA2 is shown. CSA2 consists of two parts: Stream Cipher and Block Cipher. CSA2 descrambling uses TS packets as the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N21/43H04N21/434H04N21/4385
CPCH04N21/4305H04N21/4345H04N21/4385
Inventor 窦玉超
Owner SANECHIPS TECH CO LTD
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