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File enciphering method and enciphered file structure in digital media broadcasting system

A playback system, digital media technology, applied in the direction of digital video signal modification, analog security/charging system, electrical components, etc., can solve the hidden danger of insecurity, cannot support playback system breakpoint resume, fast forward, fast reverse or skip broadcast and other issues to achieve the effect of guaranteeing benefits, reducing losses, and improving flexibility

Inactive Publication Date: 2008-08-20
INST OF ACOUSTICS CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is aimed at the existing digital media files using a key to encrypt the entire file, which cannot support the playback system to continue broadcasting, fast forward, rewind or skip broadcasting, and the potential insecurity of a single key In order to solve the deficiencies, provide a digital media file encryption method and encrypted file structure that can support functions such as breakpoint resume and skip broadcast, and at the same time minimize the loss of key leakage

Method used

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  • File enciphering method and enciphered file structure in digital media broadcasting system
  • File enciphering method and enciphered file structure in digital media broadcasting system

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Embodiment Construction

[0028] Take the original video stream file of the MPEG-2 code stream as an example below, combined with the attached figure 1 and 2 The present invention is described in further detail. The file encryption method in the digital media playback system comprises the steps:

[0029] Step 10, using the MPEG picture group as the basic unit of segmenting the original stream, and cutting the entire original stream file into multiple segments by searching for the start code of the picture group in the original stream file.

[0030] The structure of the original video stream is a hierarchical structure, and each syntax structure contains one or more subordinate structures. The beginning of the original stream is the sequence header, which contains parameters such as the bit rate and resolution of the image, and other attributes of the image are stored in the sequence extension; each video sequence contains many picture groups, and each picture group starts with the picture group heade...

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Abstract

The present invention discloses a method for encrypting the file in the digital medium playing system and the encrypted file structure thereof, wherein, the method comprises the following procedures: (1) dividing the file to a plurality of segments according to the format character of the file; (2) encrypting the segment content which needs to be encrypted; (3) including paragraph identifier in each segment; and (4) forming all the key values correlative to the file to a key list which is used for transmitting to the subscriber. The encrypted file structure comprises a medium file which is composed of a plurality of segments and a key list that is composed of a plurality of key index values and the corresponding keys. Each segment comprises medium content and the segment length field which is used for indicating the total length of this segment of data. The invention possesses the advantage that the functions of speeding, quickly returning, jumping broadcasting and the like are realized and the security of the encrypted file is increased.

Description

technical field [0001] The invention relates to a digital media playing system, in particular to a file encryption method and encrypted file structure in the digital media playing system. Background technique [0002] Digital media is gradually showing great potential for development. Taking digital film as an example, digital film is the product of the combination of traditional film industry and digital technology, showing great potential for development. Compared with traditional film movies, digital movies have many advantages. It can provide high-quality, high-definition images, significantly reduce costs, make production more convenient, have more obvious effects, copy without attenuation, higher security and more flexibility. Film digitization is an inevitable trend of film development. At present, countries around the world are accelerating the process of digital development and actively establishing a new film technology system. Various digital movie players have a...

Claims

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Application Information

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IPC IPC(8): H04N7/167H04N7/16H04N7/26H04N19/46
Inventor 曾学文贡佳炜陈君武蓓牛尔力单明辉杨木伟
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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