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In the last years, Wireless Sensor Networks (WSNs) have gained increasing attention from both the research community and actual users. These networks are likely to be composed of hundreds, and potentially thousands of tiny sensor nodes, functioning autonomously. The emergence of sensor networks as one of the dominant technology has posed numerous unique challenges to researchers. The sensor networks are vulnerable to a vast number of security threats. This security deals with issues likes privacy, authentication, confidentiality, integrity and availability. Among these, privacy is of almost importance. Privacy means each node's data should be only known to itself. Privacy in WSNs can be classified into two categories content-oriented privacy and context-oriented privacy.
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