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Erschienen in:
2005 | OriginalPaper | Buchkapitel
Password-Based Group Key Exchange Secure Against Insider Guessing Attacks
verfasst von : Jin Wook Byun, Dong Hoon Lee, Jongin Lim
Erschienen in: Computational Intelligence and Security
Verlag: Springer Berlin Heidelberg
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Very recently, Byun and Lee suggested two provably secure group Diffie-Hellman key exchange protocols using
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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.