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| Image Encryption Algorithm Based on a Complex Chaotic System |
| WANG Yue, AN Xinlei, SHI Qianqian, LIU Siyang
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| School of Mathematics and Physics, Lanzhou Jiaotong University, Lanzhou 730070, China |
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Abstract In order to improve the small key space of the encryption algorithm based on low-dimensional system design, a new five-dimensional complex chaotic system is constructed, and its chaotic dynamics properties are studied by using phase diagram, equilibrium point, Lyapunov exponential spectrum, bifurcation diagram and spectral entropy complexity. It is found that the dynamic behavior of this system is rich, and it is more suitable for image encryption algorithm than low-dimensional system. Furthermore, based on this system, a new encryption scheme is proposed in this paper. The scheme includes three diffusion and one scrambling, which can increase the security of image transmission. Finally, the performance of the encryption scheme is analyzed by calculating key space, information entropy, correlation of adjacent pixels and so on. The analysis results show that the encryption scheme designed in this paper has a large key space, good encryption effect and the ability to resist external attacks.
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Received: 23 March 2023
Published: 07 November 2024
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