The Design And Implentation Of Video Encryption System Based On Chaostic System

In recent years, due to the process of network science and technology,multimedia video application has entered a rapid development and graduallyspread in people’s life. Multimedia video data is easy to be attacked and theftwhen transmits in an open network environment like other data. How to preventthe private information of the video data being acquires and using illegally hasbecome an urgent problem. The problem of multimedia data security is becomingmore and more attention of the academia and industry. The video data is differentfrom the normal data, it has characteristics of special format, huge amount ofdata and higher requirements of real-time application capacity. The traditionalencryption algorithms are not suitable for video encryption, it needs to designnew encryption algorithm for video encryption.This paper mainly focus on the research and design of video encryptionscheme based on chaotic iterations of the system. In the basis of the H.264codecstandard which is the most widely used, this paper generates a pseudo-randomsequence used for encryption combining chaotic iterative system, and deigns avideo encryption scheme which has the value of practical application. Finally ittakes the video encryption to realize a video encryption system.Due to the inherent weakness of H.264video encryption algorithm insatisfying real-time performance, high security and low complexitysimultaneously, this paper proposes a different research direction, designscomplex spatiotemporal chaos system model, composites chaotic cipheralgorithm, and generates more secure pseudo sequence which used to encrypt. Inthe meantime, by selecting the encryption control technology, this paper encryptsthe mode of intra and inter prediction, the process of CAVLC coding and the scansequence of the residual data before coding. Experimental results show that theencryption scheme does not affect the video format and realizes the high level ofsecurity encryption effect. It also does not affect the compression ratio of thevideo data. The speed of encryption is fast, so it is very suitable for real-timeapplication.Then, based on a lot of high demand for video encryption security, this paper focuses on the safety of video encryption scheme and studys on designing a set ofvideo encryption scheme which is more secure. First of all, this paper changes thelocal equation of the spatiotemporal chaos model by fixing local to dynamicselection, builds a dynamic model of spatiotemporal chaos and then designs a setof dynamic encryption control module by selecting frame, according to thedifferent information of each frame, choosing different spatiotemporal chaosdynamic equations,it can ensure each encryption key and pseudo randomsequence generation system of frame the is different, greatly improving theencryption scheme of aggression, At the same time, this paper joins in theoperation to the encryption scheme which encrypts the sign bit and direction ofmotion vector value, further improving the effect of operation information in thevideo encryption. Experiments show that the scheme has high security, and it isvery suitable for high security requirements of encryption scenario.Finally according to the research results, this paper designs and implementsa set of multifunctional video encryption system. It implements a encryptionschemes and joins the multilayer encryption option at the same time. Dependingon the security level of encryption required by the user, this paper designedseveral levels of encryption security, it is convenient for different securityrequirements of users and enhancing the practical value of the system.