Abstract
Today, medical imaging suffers from serious issues such as malicious tampering and privacy leakage. Encryption is an effective way to protect these images from security threats. Chaos has been widely used in image encryption, the majority of these algorithms are based on classical chaotic systems. For now, these systems are easy to analyze and predict, which are not sufficient for image encryption proposes. In this paper, a novel fourth order chaotic system is proposed, accompanied by analysis of Lyapunov exponent and bifurcations. Finally, the application of this system with medical image encryption is proposed. As this system could have six control parameters and four initial conditions, the key space is far greater than 5.1 × 218191, which is large enough to resist brute force attack. Correlation analysis and differential attack analysis further demonstrate that this scheme has a strong resistance against statistical attacks and differential attack.
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Acknowledgements
The authors would like to thank Wenlong Xin for providing the knowledge of medical images. All medical images are from First Hospital Affiliated to Lanzhou University. Thanks for proofreading provided by Xiangzi Zhang. Thanks for the useful suggestions provided by Shouliang Li. This study was supported by the Fundamental Research Funds for the Central Universities (No. lzujbky-2016-238). National Natural Science Foundation of China (No. 61175012). 2017 second batch of innovation base and innovative talents (Small and medium enterprises innovation fund 17CX2JA018).
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Liu, J., Tang, S., Lian, J. et al. A novel fourth order chaotic system and its algorithm for medical image encryption. Multidim Syst Sign Process 30, 1637–1657 (2019). https://doi.org/10.1007/s11045-018-0622-0
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DOI: https://doi.org/10.1007/s11045-018-0622-0