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In this paper, the authors analyze the existing techniques that are in wireless sensor networks. Privacy in wireless sensor networks is divided into two main categories. They are the data privacy and context privacy. This paper is with respect to the context privacy. Context privacy includes the contextual information that is location privacy and temporal privacy. Location privacy covers the physical location of the data source and data sink. Their research is with respect to the base station. Suppose they consider the military applications scenario. The attacker is quite efficient to monitor the base station and destroy it. So privacy is needed to that of the base station. So a review of the available techniques with respect to that of the global eavesdropper is being presented.
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