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Wireless sensor networks processing sensitive data are facing the risks of data manipulation, data fraud and sensor destruction or replacement. However, the practical deployment of sensor networks faces many challenges imposed by real-world demands. Sensors are deployed in open environments, and hence are vulnerable to physical attacks, potentially sensor networks faces many challenges. Security is a very important issue when designing or deploying any network or protocol. In this paper the authors look at Data fusion process. One or several sensors then collect the detection results from other sensors. The collected data must be processed by the sensor to reduce the transmission burden before they are transmitted to the base station.
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