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Given the growing number of group applications in many existing and evolving domains recent attention has been focused on secure multicasting over the Internet. When such systems are required to manage large groups that undergo frequent fluctuations in group membership, the need for efficient encryption key management becomes critical. This paper presents a(More)
For ad hoc networks to realize their potential in commercial deployments, it is important that they incorporate adequate security measures. Selfish behavior of autonomous network nodes could greatly disrupt network operation. Such behavior should be discouraged, detected, and isolated. In this paper, we propose a reputation-based mechanism to detect and(More)
Many new routing and MAC layer protocols have been proposed for wireless sensor networks tackling the issues raised by the resource constrained unattended sensor nodes in large-scale deployments. The majority of these protocols considered energy efficiency as the main objective and assumed data traffic with unconstrained delivery requirements. However, the(More)
In recent years, significant advances have been achieved in almost all research areas related to Sensor-Actuator Networks (SANETs) including hardware, architectures, operating systems, routing protocols, query optimization, reliability and security. These advances have enabled a wide spectrum of applications. Yet, numerous aspects are still to explore and(More)
We propose a scalable key management scheme for sensor networks consisting of a large-scale random deployment of commodity sensor nodes that are anonymous. The proposed scheme relies on a location-based virtual network infrastructure and is built upon a combinatorial formulation of the group key management problem. Primary features of our scheme include(More)