Research On Image Encryption Algorithm Based On Chaos Theory

Since the beginning of the 21 st century,with the rapid updating of computer hardware and software,the rapid development of digital information technology,the amount of information contained in multimedia transmission technology and previous text transmission technology is no longer the same.Digital image is the most convenient and fast transmission object in network multimedia transmission.Although digital images contain a large amount of information,small size,and convenient transmission,they have been widely used in military,medical,government,and financial systems,but the improvement of convenience has led to a decline in security.Organizations that work confidentially have a high risk of using the original image for transmission.If it is maliciously intercepted,arbitrarily falsified,illegally copied,or arbitrarily transmitted by a third party during transmission,the consequences will be serious.Therefore,the safe transmission of digital images and the risk of information leakage have received widespread attention from the public.How to effectively protect the digital image of the Internet has become a problem that cannot be ignored.Digital image encryption is based on the classical encryption theory,which converts a given image into a frequency or spatial domain that does not contain the original image information.Different from ordinary text information,images and videos have the characteristics of large amount of data and strong correlation,and can also perform lossy compression.Traditional encryption algorithms cannot meet the real-time encryption requirements in applications,so many digital images are generated.A new algorithm for encryption.This paper focuses on the image encryption algorithm based on chaos theory.Firstly,the chaos theory is introduced,and several classical chaotic systems are compared: Logistic map,Hemon map,Lorenz system and cat map.Then the principle and development process of digital image encryption theory are introduced.According to the performance requirements of image encryption algorithm,the logistic mapping chaotic system is used for image encryption.The pixel position chaotic encryption and pixel value chaotic encryption algorithm are used to compare the encryption of standard image.The effect is to improve the combination of the two algorithms to achieve a good encryption effect.Finally,in the matlabR2014 a environment,a digital image chaotic encryption human-computer interaction platform is designed and implemented,which can quickly encrypt and decrypt digital images and obtain correct decryption results.