Video data enciphering/deciphering method

Abstract

A method for ciphering / deciphering the video data is characterized in that the ciphering component is embedded in the encoding process and adopts a strategy of grouping scrambling for ciphering the DCT coefficient of the digital video data. The deciphering data is embedded into the decoding process and adopts an inverse scrambling strategy which is reverse to the ciphering for deciphering the DCT coefficient of the digital video data. The frame movement compensating of the digital video can be simultaneously executed with scrambling to obtain a higher security. The invention embeds the ciphering / deciphering into the coding / decoding process and has the advantages of high ciphering speed and low actualizing difficulty. The technique of dynamic key is adopted and the invention has strong clear text attacking resistance. The effect of the ciphering / deciphering method of the invention is reduced to the minimum. The quality of the deciphered vide image does not have any loss compared with the video image before ciphering.

Description

technical field [0001] The invention relates to a data encryption / decryption method, in particular to a video data encryption / decryption method. Background technique [0002] In today's information age and the background of globalization, the competition among peers (countries, enterprises, research institutions, etc.) is becoming increasingly fierce, and information security issues are getting more and more attention. Video information is the core of multimedia information. Driven by the vigorous development of network, communication and video technology itself (such as MPEG-X and H.26X series video codec international standards, etc.), its release and communication will become more popular, such as video Publications (Video Publications), Video-On-Demand (Video-On-Demand, VOD) and video conferencing (Videoconferences), etc., people urgently need to solve their security problems in commercial, military and other private background applications. In addition, in the Digital ...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: in order to overcome the shortcomings of the traditional digital encryption algorithm, such as complex process, large amount of calculation, high cost, and format loss, and at the same time avoid the insufficient security of the simple digital video data random scrambling algorithm and reduce the encoding compression rate problem, the present invention adopts the scheme of scrambling DCT coefficients and motion compensation vectors and their recovery, and provides a new DCT coefficient packet scrambling strategy; without affecting the quality of video and ensuring that the code stream after encryption is a standard video On the premise of code stream, it provides a digital video data encryption method with small increase in code stream and high security

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