Framing Honest Participants In A Fault Tolerant Group Key Agreement Protocol
Recently, Zhao et al. proposed an efficient fault tolerant group key agreement protocol.In this paper, we show that
the fault detection technique of their protocol has a security flaw. We prove that a malicious member of the group can easily
frame an honest participant such that when the fault detection is executed, then the honest member will be marked malicious
and get excluded while the malicious participant can remain in the group. We then propose an improvement to overcome this
Keywords: Cryptography, Group key agreement, Fault-tolerance, Efficiency, Attack.