Image Encryption Of Chaotic System Based On Shuffle Algorithm

In recent years,with the rapid development of computer technology and communication technology,digital information has been widely used in various fields of society.Because of its visual image and vivid features,digital image has become the most widely used and important form of information expression in digital information.Therefore,the security of digital image has become an eternal problem.The security of encryption algorithm based on chaotic system design depends largely on the performance of chaotic system.How to design a better chaotic encryption system has beeome a research hotspot.lt i5 extremely difficult to design a new chaotic system,and the one-dimensional system is simple in structure and easy to implement.In this paper,the perturbation and diffusion are improved respectively on the basis of the existing one-dimensional perturbation and diffusion structure,and the system characteristics are analyzed.In addition,the chaotic sequence is encrypted by the complex structure of the high-dimensional system,so as to obtain the security of the algorithm to a higher degree.Based on chaos theory and characteristics,the security of several typical image encryption algorithms based on chaos theory is analyzed in detail.This paper briefly introduces and analyzes the current situation of image encryption at home and abroad,introduces the related characteristics of chaotic system and image encryption,and briefly introduces the basic mapping of one-dimensional logic system and simple two-dimensional logic,which lays a foundation for further improvement of image encryption technology.This dissertation presents an algorithm of bidirectional folding diffusion chaotic system encryption based on shuffling algorithm.Based on the classical Logistic simple chaotic system,the encryption algorithm innovatively USES the improved shuffling algorithi proposed in this paper to scramble pixel positions.Multidirectional diffusion is then used to simplify the optirization,and bidirectional folded diffusion is used.In information entropy and other aspects of good performance.An encryption method for two-dimensional hyperchaotic systems with double scrambling and double diffusion is proposed by improving the simple two-dimensional hyperchaotic systems.The simple scrambling of two-dimensional hyperchaos is transformed into plaintext sequence,and the simple diffusion step is improved.The dimension is improved through diffusion scrambling operation,and then the improved shuffling scrambling algorithm and two-direction folding diffusion algorithm are combined to encrypt,and then the simulation experiment is carried out.Simulation results show that chaotic encryption algorithm with double scrambling of image pixel position and pixel value is superior to that using logical chaotic sequence.Two cryptographic chaotic functions are designed based on shuffling algorithm and cryptographic chaotic ftinction,and the heterogeneous diffusion cryptographic algorithm and the improved encryption method of two-dimensional hyperchaotic system can better resist differential attacks and statistical analysis.The key is sensitive and can effectively resist ciphertext attacks,the key is also large and the encryption effect is good.Figure[28]table[11]reference[65].