Digital Image Encryption And Decryption System Based On Chaotic Algorithm And Matlab Simulation

In recent years,with the rapid development of computer technology and multimedia applications,a variety of information to be widely disseminated on the network,more and more convenient in the dissemination of information at the same time,followed by the dissemination process is brought of the various security issues,information security issues gradually related to the country's political,military,economic and cultural and educational fields such as more and more.If there is not a good solution to these problems,it will directly endanger the country's economic,financial,political and national security and a series of unstable factors.In all forms of information dissemination,image information is the main way that people now acquire information,and naturally the security of digital image information transmission becomes the most important factor in information security.Because the digital image itself has a huge amount of information and high redundancy and other characteristics.Therefore,in comparison with ordinary text data,the traditional encryption algorithm in the digital image information encryption process is not entirely suitable.At the same time,with the rapid development of cryptography and the continuous improvement of computer technology,a variety of methods of intercepting encrypted information is also improving,but also makes some of the traditional encryption method is easier to be cracked.So the information acquirers need to use a more secure encryption technology to encrypt the presence of image information.This article mainly studies how to improve the security of digital image in the process of information security.Because chaos has certainty,boundedness,extreme sensitivity to the initial value,long-term non-estimable and other good characteristics,so that chaos in the image data encryption,communication confidentiality,computer graphics processing,signal processing and signal Transmission and mechanical control system optimization and other directions have its wide range of applications.In this paper,based on the study of previous studies on chaos encryption,a new image encryption based on m-sequence and logistic chaotic mapping is proposed under the premise of verifying the m-sequence as the advantages of image encryption key algorithm.And the simulation experiment is carried out by matlab to verify its feasibility.And through the analysis of the encryption effect,it is proved that the algorithm has better anti-attack ability,and it is better than the independent m-sequence encryption in the security effect and the protection ability.