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Lack of well-defined defense perimeter in MANETs prevents the use traditional firewalls, and requires the security to be implemented in a distributed manner. The authors recently introduced a novel deny-by-default distributed security policy enforcement architecture for MANETs by harnessing and extending the concept of network capabilities. The deny-by-default principle allows compromised nodes to access only authorized services, limiting their ability to disrupt or even interfere with end-to-end connectivity and nodes beyond their local communication radius.
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