Research On X-ray Digital Image Encryption Based On Chaotic Theory

With the continuous development of science and technology,X-ray imaging detection in the oil field and other industrial testing has been widely used,X-ray images can be more intuitive to reflect the internal situation of the object is to understand the internal structure of the object and product quality an important means.For some of the characteristics of X-ray images,the traditional encryption algorithms commonly used in the past have been unable to meet the encryption requirements for X-ray images.In recent years,chaotic systems are usually used and confidential communication,it is precisely because it has the initial sensitivity,ergodicity,class random and other characteristics.Therefore,the application of chaos theory to X-ray image encryption has become the focus of people’s research.Firstly,the characteristics of X-ray and its spatial correlation,the theoretical basis of cryptography,the definition of chaos and the chaotic motion and chaos model are analyzed.The relationship between cryptography and chaos theory is summarized.The basic requirements of chaotic image encryption algorithm,the basic design idea of chaotic image encryption technology,the problem of chaotic image encryption technology are presented,and the overall encryption flow chart is drawn.The chaotic image encryption technology is introduced.Secondly,based on one-dimensional Logistic map,a double chaotic sequence X-ray image encryption algorithm is proposed.The framework of the double chaotic sequence Xray image encryption system is designed,and the chaotic sequence generation module and the encryption and decryption module are designed and analyzed respectively.Finally,the feasibility of this method is verified by the encryption effect test and its safety analysis.Finally,the defects of one-dimensional chaotic system in encryption are analyzed,and the double-chaotic X-ray image encryption algorithm is improved.An X-ray image encryption algorithm based on compound chaotic sequence is proposed.The order of the pixel values of the X-ray image is introduced to determine the order of the two different positions of the design.For the X-ray image pixel value replacement is designed to block the way of its encryption.Finally,the feasibility of this method is verified by the encryption effect test,and the security of the method is verified by the security analysis.The method has the advantages of high security performance and strong ability to resist malicious attack.