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The importance of secure communication between only legitimate group members in ad hoc networks has been growing in recent years. Due to the ad hoc nature the scalability on dynamic membership change is a major concern. However, the previous models require at least ) log ( n O communication cost for key update per each membership change, which imposes a heavy burden on the devices. In this paper we present a scalable model that supports communication-efficient membership change in ad hocdoi:10.3837/tiis.2011.09.010 fatcat:skcwvaxm2rgzffj6x6x7mtbiqi