Improved ID-Based Authenticated Group Key Agreement Secure Against Impersonation Attack by Insider

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Executive Summary

Many conference systems over the Internet require authenticated group key agreement (AGKA) for secure and reliable communication. After Shamir proposed the ID-based cryptosystem in 1984, ID-based AGKA protocols have been actively studied because of the simple public key management. In 2006, Zhou et al. proposed two-round ID-based AGKA protocol which is very efficient in communication and computation complexity. However, their protocol does not provide user identification and suffers from the impersonation attack by malicious participants.

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