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Recently, Chien et al. proposed a Gateway-oriented Password-based Authenticated Key Exchange (GPAKE) protocol, through which a client and a gateway could generate a session key for future communication with the help of an authentication server. The authors also described that their scheme is provably secure in a formal model. However, in this paper, they will show that Chien et al.'s protocol is vulnerable to the off-line password guessing attack. To overcome the weakness, they also propose an efficient countermeasure.
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