Encryption and decryption method for static audio/video document

A file encryption, audio and video technology, applied in the direction of TV, electrical components, pulse modulation TV signal transmission, etc., can solve the problems of abnormal display, increase the amount of decoding calculation of the whole machine, etc., to reduce the difficulty of encryption implementation and implementability Good, increase the effect of confidentiality performance

Inactive Publication Date: 2009-01-14
SICHUAN CHANGHONG ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Some represent colors, and some represent grayscale. Overly complex encryption methods may ...

Method used

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Examples

Experimental program
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Embodiment

[0022] 1. First divide an image (the grayscale value of a monochrome image or the brightness component or color difference component signal of a color image) into 8×8 blocks, and digitize each block; take one block as an example to obtain a compressed file:

[0023] 00 01 11 10 00

[0024] 00 10 11 01 00

[0025] 01 01 11 10 01

[0026] 10 10 11 10 10

[0027] 2. Insert an additional code into the compressed file, including: display start time, display end time, password, password length, cycle times, additional code: 8868, 8811, XXXX, 0201 (886 means that the display start time is 2008-8 -6 to start playing, 888 means that the display end time is 2008-8-8; the password is 11, the length of the encrypted password is 02, and the number of loop calculations is 01, and XXXX indicates that the corresponding password can be added, and the description is simplified here. XXXX for short), get files 8868, 8811, XXXX, 0101, 0001, 1110, 0000, 1011, 0100, 0101, 1110, 0110, 1011, 1010;...

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PUM

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Abstract

The present invention relates to an encryption technique of television products. The present invention provides a static audio and video file encryption method by a mode of performing data codeword matching to file contents, and provides a decryption method for the encryption method. The static audio and video file encryption method includes the following steps: a. inserting an extracode to the compressed files head, wherein the extracode includes a display starting time, a display finish time, encryption signs, encryption codeword; b. dividing the compressed files with inserted extracode into original data packets with fixed length; c. performing convolution to each original sub-packet, and then XOR with the encryption codeword to generate an encryption data packet; d. embedding the encryption codeword into a fixed positon of the encryption data packet, to generate a new encrypted data file. The static audio and video file decryption method adopts the corresponding inverse operation. The inventive method ahs small encryption calculation amount, and is suitable for the main chip of television set with slower operation speed.

Description

technical field [0001] The invention relates to an encryption technology for television products. Background technique [0002] In order to ensure the commercial interests of advertisers, more and more advertising machine customers hope that the advertising machine can encrypt / decrypt the playback content. In this way, when the same advertising machine plays the advertising content, it can be pre-set through the advertising machine to decide whether to read and display; [0003] For the encrypted content, the display time period, display order and display method can also be determined by setting the display time period. At the same time, even if non-advertising operators change the content of the advertising machine, they cannot play it on the advertising machine, which can also prevent the spread of bad information. In this way, the broadcast content of the outdoor advertising machine can be protected, and it is also convenient for the advertising company to calculate the...

Claims

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Application Information

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IPC IPC(8): H04N7/24H04N7/167
Inventor 梁敏
Owner SICHUAN CHANGHONG ELECTRIC CO LTD
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