Abstract
Very recently, Lee et al. (C. Lee, C. Chen, C. Wu, S. Huang, An extended chaotic maps-based key agreement protocol with user anonymity, Nonlinear Dynamics, doi:10.1007/s11071-011-0247-4) proposed a chaotic maps-based key agreement protocol with user anonymity and claimed their protocol could resist various attacks. In this paper, we will point out that Lee et al.’s protocol suffers from three weaknesses: (1) inability of resisting the privileged insider attack; (2) inability of resisting the denial-of-service attack; and (3) inability of providing anonymity. To overcome the weaknesses, we also proposed an improved protocol. The analysis shows our protocol is more suitable for practical applications.
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Acknowledgements
The authors thank Professor Ali H. Nayfeh and the anonymous reviewers for their valuable comments. This research was supported by the Open Funds of State Key Laboratory of Information Security and the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20110141120003).
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He, D., Chen, Y. & Chen, J. Cryptanalysis and improvement of an extended chaotic maps-based key agreement protocol. Nonlinear Dyn 69, 1149–1157 (2012). https://doi.org/10.1007/s11071-012-0335-0
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DOI: https://doi.org/10.1007/s11071-012-0335-0