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The authors investigate performance characteristics of secure Group Communication Systems (GCSs) in mobile ad hoc networks that employ intrusion detection techniques for dealing with insider attacks tightly coupled with rekeying techniques for dealing with outsider attacks. The objective is to identify optimal settings including the best intrusion detection interval and the best batch rekey interval under which the system lifetime (mean time to security failure) is maximized while satisfying performance requirements. In this paper, they propose a distributed hierarchical key management scheme in which nodes can get their keys updated from optimally selected nodes.
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