Abstract
A novel bit-level image cryptosystem is proposed by introducing a new coupled map lattices (CML). The modified non-adjacent spatiotemporal chaotic system with good dynamic performance is constructed by coupling the piecewise-linear chaotic map (PWLCM) in a non-adjacent manner. In the proposed bit-level image cryptosystem, the binary plain image is scrambled globally by a 2D hyper-chaos system. And the confused image is then diffused via the pseudo-random sequences produced quickly and efficiently from the fabricative CML. After converting the diffused binary matrix into its homologous decimal matrix, the cipher image is achieved. Computer simulations and performance comparisons with recent image encryption algorithms demonstrate the superior performance and high security of our proposed cryptosystem.
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Acknowledgements
This work is supported by the National Natural Science Foundation of China (Grant Nos. 61462061 and 61262084), the Major Academic Discipline and Technical Leader of Jiangxi Province (Grant No. 20162BCB22011), the Opening Project of Shanghai Key Laboratory of Integrate Administration Technologies for Information Security (Grant No. AGK201602) and the Innovation Fund for graduates of Nanchang University (Grant No. CX2016260).
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Guo, S., Liu, Y., Gong, L. et al. Bit-level image cryptosystem combining 2D hyper-chaos with a modified non-adjacent spatiotemporal chaos. Multimed Tools Appl 77, 21109–21130 (2018). https://doi.org/10.1007/s11042-017-5570-4
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DOI: https://doi.org/10.1007/s11042-017-5570-4