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A group key exchange (GKE) protocol is designed to allow a group of parties communicating over a public network to establish a common secret key. As group-oriented applications gain popularity over the Internet, a number of GKE protocols have been suggested to provide those applications with a secure multicast channel. Among the many protocols is Yi et al.`s password-based GKE protocol in which each participant is assumed to hold their individual password registered with a trusted server. A fundamental requirement for password-based key exchange is security against off-line dictionary attacks. However, Yi et al.`s protocol fails to meet the requirement. In this paper, we report this security problem with Yi et al.`s protocol and show how to solve it.

Yi et al.'s Group Key Exchange Protocol : A Security Vulnerability and its Remediation