Abstract
Very recently, Byun and Lee suggested two provably secure group Diffie-Hellman key exchange protocols using n participant’s distinct passwords. Unfortunately, the schemes were found to be flawed by Tang and Chen. They presented two password guessing attacks such as off-line and undetectable on-line dictionary attacks by malicious insider attacker. In this paper, we present concrete countermeasures for two malicious insider attacks, and modify the two group Diffie-Hellman key exchange protocols to be secure against malicious insider password guessing attacks. Our countermeasures do not require additional round costs, hence they are efficient.
This research was supported by the MIC(Ministry of Information and Communication), Korea, under the ITRC(Information Technology Research Center) support program supervised by the IITA(Institute of Information Technology Assessment).
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Byun, J.W., Lee, D.H., Lim, J. (2005). Password-Based Group Key Exchange Secure Against Insider Guessing Attacks. In: Hao, Y., et al. Computational Intelligence and Security. CIS 2005. Lecture Notes in Computer Science(), vol 3802. Springer, Berlin, Heidelberg. https://doi.org/10.1007/11596981_21
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DOI: https://doi.org/10.1007/11596981_21
Publisher Name: Springer, Berlin, Heidelberg
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