Research On Image Encryption Algorithm Based On Hyperchaotic System And Compressed Sensing

Since the rapid development of the Internet in the early 21st century,people have been able to easily transmit various image information,but these image information may contain personal privacy or sensitive data,and once leaked,it may lead to unpredictable consequences.Therefore,safe and effective encryption of image information before image transmission can protect image content and protect user privacy,which has important scientific research value and practical significance.In this paper,through the research on image information security,chaotic system and compressed sensing,a new two-dimensional hyperchaotic system is proposed on the basis of classical chaotic mapping,which can ensure the security of encryption system while improving the performance of chaotic mapping system sex.Combining the proposed new chaotic system with bit shifting,a safe and effective image encryption algorithm is designed.In view of the large amount of image data and low transmission efficiency,it is proposed to integrate two-dimensional compressed sensing into the image encryption scheme.The following is the main research content of this paper:(1)In order to make up for the shortcomings of simple low-dimensional chaotic system and complex structure of high-dimensional chaotic system,this paper proposes a two-dimensional hyperchaotic system based on the improvement of Henon,Sine and Cosine chaotic systems.This paper compares the performance of the proposed hyperchaotic system with the two-dimensional chaotic system proposed in recent years.The experimental results show that the improved two-dimensional hyperchaotic system has good chaotic performance.In order to verify the feasibility and practicability of the new chaotic system,a gray image encryption scheme based on the two-dimensional hyperchaotic system is proposed on the basis of the hyperchaotic system.The simulation results and security analysis show that the encryption scheme has good encryption effect.(2)In order to solve the problem of slow transmission of image information on the network,this paper proposes a color image compression and encryption scheme based on hyperchaotic system.In order to reduce the storage cost of the algorithm,the chaotic sequence is used to construct the measurement matrix,which improves the compression performance of the algorithm to a certain extent.First,simple and efficient permutation operations are used to scramble the pixels of the plaintext information,and then the constructed measurement matrix is used to measure and compress the two directions of the image at the same time,and the compressed information is diffused by dynamic DNA encoding,operation and decoding operations,and finally An improved Joseph scrambling is proposed to further reduce the correlation between pixels and further improve the security of the encryption algorithm.After experimental simulation,the encryption algorithm has advantages in compression performance,key sensitivity,key space,etc.,and can resist common attacks such as statistical attack and differential attack.