Research And Implementation Of Chaotic Image Encryption Algorithm

With the rapid development of Information digital and Internet technology has changed people's way of communication,in communication process with images as the transmission media,with the development of transmission and receiving equipment,illegal access to information through the communication network is more and more easy,transmission of information often human attacks,how to ensure the safety of the process of image transmission has become an important topic in recent years,image encryption is one of the most effective way to ensure the safety of image.DES and AES are commonly used symmetric encryption algorithms for text encryption,but they do not apply to digital image information with large amounts of data,redundancy and correlation.Chaotic systems,such as extreme sensitivity,aperiodic and unpredictable long-term evolution orbit correspond to the key encryption system sensitivity,ciphertext assumes the noise characteristics and ciphertext sensitivity,which makes them are widely used in image encryption.Therefore,a large number of image encryption algorithms based on chaos theory have emerged.This research mainly focuses on chaotic image encryption technology,and further implements image security encryption.Firstly,it introduces the related knowledge of chaos theory and cryptography,expounds the role of chaos theory in image encryption,and then introduces the steps of chaotic image encryption in detail.In order to improve the security of the image encryption algorithm,this paper first combines the Logistic chaotic system with the improved ZigZag transform to achieve image encryption.Aiming at the deficiency of ZigZag transform,the logistic chaotic system is combined with the improved ZigZag transform to simulate the decryption process of the encryption process,and the experimental results are analyzed.Because DNA algorithms have great advantages in computing parallelism,informationstorage and energy consumption,many scholars combine chaos theory with DNA algorithms.This paper aims at the shortcomings of traditional DNA algorithms,and improves the encoding method of DNA algorithms.It combines the hyperchaotic system with the DNA loop operation to achieve image encryption and decryption.Finally,simulation experiments were conducted to analyze and compare the performance of the algorithm from key space,key sensitivity,neighbor pixel correlation,and information entropy.