Image Encryption Algorithm Based on a Four-DimensionalHyperChaotic System
In order to solve the problems of low complexity and poor application in image encryption of low-di-mensional chaotic system,this paper explored the dynamic characteristic of a four-dimensional hyperchaotic system and its encryption application through phase diagram,bifurcation diagram,Lyapunov exponential spectrum and spectral entropy complexity.The simulation results show that the chaotic state of the system is distributed in a large parameter range and has a large complexity value,indicating that the system can be well applied to image encryption.To this end,this paper designed an image encryption scheme based on four-dimensional hyperchaotic system.The al-gorithm mainly used the improved Arnold transform to disturb the pixel point position of the plaintext image,and dif-fused the image after the image operation was performed,and the encrypted image was obtained.Finally,the safety performance of the algorithm was analyzed by key space,adjacent pixel relationship,information entropy,histogram,and differential attack.The experimental results show that the encryption algorithm can not only effectively encrypt the image but also high security.
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