A Hyperchaotic Image Encryption Method

Abstract

The invention puts forward a novel hyper-chaotic image encryption method which is mainly used in the field of gray image encryption. The algorithm mainly comprises the following steps: first, a plain image of which the size is N*M is segmented into M column vector groups, the pixels in the obtained vector groups are converted into bits to get 8*M vector groups, and scrambling operation is carried out; then, the obtained scrambled pixel values are re-mapped to an interval [0, 255] to get an intermediate cipher text; and finally, diffusion operation is carried out on a chaotic sequence generated by a Hyperhenon chaotic system and the intermediate cipher text to get a final cipher text. Experimental simulation shows that the algorithm not only can improve the disadvantages of a low-dimensional chaotic system and resist statistical characteristic attack and differential attack, but also can effectively resist four classic attacks, well hide plaintext information and achieve a good encryption effect.

Description

technical field [0001] The invention belongs to a grayscale image encryption method, in particular to a hyperchaotic image encryption method. Background technique [0002] With the rapid development of computer networks, more and more pictures are transmitted in the network, which has aroused people's attention to the problem of safe transmission of pictures. Nowadays, scholars at home and abroad pay great attention to how to encrypt pictures during image transmission. [0003] Due to the strong correlation of pixels of the image itself, high redundancy and large data volume, it is difficult to apply the traditional text encryption method to image encryption. In recent years, experts have pointed out that chaotic systems have the characteristics of high sensitivity to initial conditions, positive Lyapunov exponent, fractal and fractal dimensions, etc., which can be applied to image encryption, and some chaotic image encryption methods have gradually been proposed: such as on...

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Problems solved by technology

[0005] For example, there are great difficulties in transmitting and distributing the one-time pad key; the bit encryption method needs to convert all pixel values ​​into binary for image encryption, so the encryption efficiency is relatively low and time-consuming; the mathematical model encryption method requires Compared with the factors considered, it is not conducive to the realization of the encryption algorithm; and the pixel correlation coefficient in the DNA sequence encryption method is relatively high, and it is easy to be decrypted by an attacker

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