Bit-level image encryption method based on composite Tent chaotic mapping

Abstract

The invention proposes a bit-level image encryption method based on composite Tent chaotic mapping, and the method comprises the steps: firstly, carrying out the coupling of Tent mapping, Logistic mapping and Sine mapping, obtaining a composite chaotic mapping TLS, improving the complexity of a chaotic system, enhancing the randomness of a secret key sequence, enabling the parameter range of the chaotic system to be expanded, and achieving the encryption of a bit-level image. Therefore, the security of the encryption system is effectively improved. And compared with a high-dimensional chaotic system, the execution cost of the one-dimensional chaotic system is lower. A plurality of composite chaotic systems are introduced in the encryption process to increase the number of keys, the key space of the algorithm is expanded, and the algorithm can well resist violent attacks. A matrix splicing method is used in the scrambling process, and the problem of bit limitation during bit scrambling is solved. Two rounds of XOR operation are used in the diffusion process, and the differential attack resistance of the encryption system is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of digital image encryption algorithms, in particular to a bit-level image encryption method of compound Tent chaotic maps. Background technique [0002] With the continuous development of Internet technology and modern communication technology, more and more multimedia data are widely disseminated in the Internet by taking advantage of the sharing and accessibility of the network. Among many multimedia information, digital images are used as a tool to transmit data information because of their vivid images and containing a large amount of visual information. However, many digital images are easy to leak a lot of personal privacy and military secrets when they are transmitted in the network without encryption. Therefore, how to design an effective digital image management system for digital images with high redundancy, large data volume, strong correlation between adjacent pixels, and image information secur...

AI Technical Summary

Problems solved by technology

[0003] The traditional one-dimensional chaotic map has shortcomings such as uneven distribution of mapping, small range of chaotic parameters, and low randomness of the generated key sequence, which leads to poor encryption effect of the image encryption algorithm based on one-dimensional chaotic map.

And because the chaotic parameters of the traditional one-dimensional chaotic map are less, the key space is small, and the algorithm cannot effectively resist brute force attacks

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