Cross-plane colour image encryption scheme based on BST model and chaotic map
School of Information Science and Engineering, Dalian polytechnic University, 116034, Dalian, China
2 School of management, Dalian Polytechnic University, 116034, Dalian, China
Accepted: 3 April 2022
Published online: 16 April 2022
In this paper, a new memristor-based chaotic image cryptosystem is designed for colour image encryption. Firstly, the new memristor chaotic system is combined with a dynamic variable selection mechanism (DSVSM) to generate the chaotic state variables for confusion and diffusion phases. Then, a BST model based on binary sort tree adjustment is designed and introduced into the confusion process so as to achieve pixel’s cross-plane confusion. During the whole confusion process, the pixel values between the three channels of the colour image are confused based on the adjustment results of the BST model follow by the pixels in each channel are confused again based on the adjustment process of the BST model. Finally, a row-column-based diffusion algorithm is used to speed up the encryption process. Experimental results and performance evaluations demonstrate that our cryptosystem has superior security and efficiency.
© EDP Sciences, Springer-Verlag GmbH Germany, part of Springer Nature 2022