Wireless Sensor Networks (WSN) is one of the fastest rising emerging technologies that find widespread use in various applications comprising of military, health, agriculture, habitat etc. Seen as sensor network deployed at sites which can be considered as remote and hostile, the technology is seriously faced with challenges to the network and functional security at the cost of their inherent limitations in energy capacity and computing power. In this paper we have delved upon and summarized earlier research on security challenges poised to WSNs, classified the threats and then presented a generic WSN security model keeping in line with the intended security targets to be met. We have also tried to give a realistic theoretical analysis of our WSN security model against these threats.
Conventional concentrators with inhomogeneous coating materials that fully enclose the destined region pose great challenges for fabrication. In this paper, we propose to design an EM concentrator with homogeneous materials. Distinguished from conventional ones, the elaborately designed EM concentrator features a concentrator region that is open to the outer-world, which is achieved with multi-folded transformation optics method by compressing and folding the coating materials to create window(s). Based on this concept, we also investigate open-rotator and open rotational-concentrator devices, which could simultaneously rotate and store the EM waves in the central destined region. Due to the open nature of our proposed designs, we believe they will find potential applications in remote controlling with impressive new functionalities.
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