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Dynamic random mess correction and enciphering-deenciphering method for video frequency information

A video information, dynamic random technology, applied in the field of video information encryption and decryption, can solve problems such as not suitable for video information, achieve broad application prospects, meet real-time and security, and reduce the amount of calculation and complexity

Inactive Publication Date: 2006-12-13
WUHAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, using a fixed scrambling matrix to scramble the entire code stream is not suitable for the encryption of video information, and it needs to be improved if it is applied to video encryption.

Method used

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  • Dynamic random mess correction and enciphering-deenciphering method for video frequency information
  • Dynamic random mess correction and enciphering-deenciphering method for video frequency information
  • Dynamic random mess correction and enciphering-deenciphering method for video frequency information

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Embodiment 1

[0037] Embodiment 1: Video Conference System

[0038] The most immediate application of the present invention is real-time video communication system. Real-time video applications particularly emphasize that encryption and decryption do not affect real-time transmission of video. The invention adopts a pseudo-random sequence to generate a scrambling matrix, and then scrambles and encrypts key data blocks in the compressed video data. The operation that determines the encryption speed mainly has two parts: the generation of pseudo-random sequence and the scrambling of key data blocks. The scrambling of key data blocks is just a copy operation of some buffers, which is very fast. The generation of the pseudo-random sequence can be realized by hardware or by software, and different realization methods have different speeds. After testing, using software to generate pseudo-random sequences can also ensure real-time performance.

[0039] The most typical example of a real-time ...

Embodiment 2

[0040] Embodiment 2: Digital TV / Video on Demand

[0041] Digital TV is a brand new TV service and the inevitable result of the development of digital technology in the TV field. The biggest advantage of digital TV lies in high-quality video and audio quality. Digital TV is a relative concept corresponding to analog. It uses binary numbers to express image and audio signals through sampling, quantization and coding of analog TV signals to digitize TV signals. Users can use existing cable TV through set-top boxes. Internet to watch digital TV programs broadcast by the digital TV system. "Digital TV set-top box" is a conversion device that converts digital TV signals into analog signals. It decodes and restores digitally compressed and encoded image and sound signals into analog signals, so that analog TVs can also accept digital TV signals.

[0042] Another advantage of digital television is interactivity. Interactive TV is the development trend of digital TV, and video on de...

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Abstract

This invention relates to a dynamic random disturbance and cipher-decipher method of the video information characterizing in extracting several key data blocks for disturbance from the video information needing to be ciphered then to recover the disturbed data blocks to the extract position to be mixed with those nonkey data as the ciphered video stream to be output. The de-cipher process is similar to that. The matrix used in disturbance is dynamically generated by pseudo-random sequence, the disturbance matrixes are different to all video frames, security reaches the applied level. This invention can realize standard compressive video information cipher and decipher with hierarchy security.

Description

technical field [0001] The invention belongs to a method for encrypting and decrypting video information, in particular to a dynamic random scrambling encryption and decryption method for video information which conforms to the standards of MPEG sequence and H.26x sequence and has high security. Background technique [0002] With the development of network technology, the application of various video information is becoming more and more extensive. Examples include video conferencing, videophones, streaming services, and telemedicine, to name a few. For some special industries, some of these video information are very important, and once leaked, the loss cannot be measured. For example, images used for telemedicine diagnosis may involve personal privacy and life safety; video image information in e-commerce may involve huge interests of the company; Video image information in activities may involve social stability and economic ups and downs, while ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/167H04N7/16
Inventor 徐正全姚晔李伟杨志云徐彦彦张明王怡琳
Owner WUHAN UNIV
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