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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, ensure security, and improve security

Inactive Publication Date: 2005-05-18
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

Examples

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Embodiment 1

[0037] Example 1: Video Conference System

[0038] The most direct application of the present invention is a real-time video communication system. Real-time video applications especially emphasize that encryption and decryption do not affect the real-time transmission of video. The invention adopts pseudo-random sequence to generate scrambling matrix, and then performs scrambling and encryption on the key data blocks in the compressed video data. The operation that determines the encryption speed mainly consists of two parts: the generation of pseudo-random sequences 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 implemented by hardware or software, and different implementations have different speeds. After experiments, the pseudo-random sequence generated by software can also ensure real-time performance.

[0039] The most typical exa...

Embodiment 2

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

[0041] Digital TV is a brand-new TV service and an inevitable result of the development of digital technology in the field of TV. The biggest advantage of digital TV is the high-quality audio and video quality. Digital TV is a relative concept corresponding to analog. It samples, quantizes and encodes analog TV signals, expresses images and accompanying sound signals with binary numbers, and digitizes 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 TV is interaction. Interactive TV is the development trend of digital TV, and video on demand (VOD...

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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 high confidentiality of MPEG sequence and H.26x sequence standards. 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, video telephony, streaming services, and telemedicine, to name a few. For some special industries, some of these video information is very important, and the loss cannot be measured once it is leaked. For example, images used for telemedicine diagnosis may involve personal privacy and safety of life, video image information in e-commerce may involve huge interests of the company, on-site recording photos during legal proceedings should be guaranteed not to be tampered wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/16H04N7/167
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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