Image encryption method based on L-F cascade chaos and 3D bit scrambling

Abstract

The invention discloses an image encryption method based on L-F cascade chaos and 3D bit scrambling. Image encryption is mainly divided into two steps: (1) 3D bit scrambling encryption and (2) diffusion operation. A novel L-F cascade chaos is constructed, the problem that a blank window exists due to uneven distribution of Logistic is solved while the rapidity of the Logistic is guaranteed, the chaos interval and number of parameters are increased, the secret key space is increased, and the exhaustion attack resistance of the system is improved. According to the method, the randomness of scrambled ciphertext is improved by adopting a 3D cyclic shift bit scrambling mode, and the problem that a bit scrambling sequence is insensitive is solved. According to the method, high-order informationcontaining a large amount of plaintext information and low-order information containing a small amount of plaintext information are separately scrambled, so that the noise attack resistance of the system is improved. According to the encryption system, the plaintext SHA-256 is used for carrying out strong association on the chaotic key, so that the plaintext sensitivity and the capability of resisting the attack of the selected plaintext are effectively improved.

Description

technical field [0001] The invention relates to an image encryption method, in particular to a 3-dimensional (3D) cyclic shift bit scrambling image encryption method. Background technique [0002] Image information is intuitive and vivid, and is widely used in the modern digital age, but it is vulnerable to various attacks by hackers. Therefore, image security has attracted more and more attention from scholars, such as the encryption scheme of pixel position scrambling and pixel value replacement proposed by Chen G in 2004, and the idea of ​​bit scrambling proposed by Guodong Ye in 2010, but the above two methods are resistant to The attack ability is weak. Recently, a large number of scholars have made improvements. For example, Deng Xiaoheng et al. in 2014 and Xie Guobo et al. in 2016 added bit scrambling after pixel position scrambling on the basis of ChenG. In 2018, Shuliang Sun added DNA coding after bit scrambling. This type of algorithm not only retains the advanta...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problem that the existing bit scrambling encryption method is not sensitive to bit scrambling and has weak anti-noise and chosen plaintext attack capabilities, the present invention provides an image encryption method based on L-F cascading chaos and 3D bit scrambling

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