Most of the work for securing the routing protocols of mobile ad hoc wireless networks has been done in prevention. Intrusion detection systems play a complimentary role to that of prevention for dealing with malicious insiders, incorrect implementation and attack models. This paper presents a statistical framework that allows the incorporation of prior information about the normal behavior of the network and of network attacks in a principled way for the detection of known and unknown attacks. For detecting an attack as soon as possible it uses quickest change detection algorithms.
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