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Nodes in the Wireless Sensor Network may be lost due to either depletion of battery power or malicious attacks. So it is inevitable to insert a new node for the extension of life time of Sensor Networks. A lot of researchers proposed their works towards this arena that is how to make the authors' Sensor Networks secure. Basically making their Sensor Networks secure, there is a mechanism of Access Control in Sensor Networks. Through the implementation of Access Control they could make their Sensor Networks secure in against of various malicious attacks as well as to save unnecessarily exhaustion of Sensor Networks' resources. This paper addresses the existing Access Control schemes over Wireless Sensor Networks.
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