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Wireless Sensor Networks (WSN) are typically deployed in an unattended environment, where the legitimate users can login to the network and access data as and when demanded. Efficiency of WSN depends on the correctness of the information which has been collected. Consequently, verifying authenticity and integrity of delivered data is indispensable for security-sensitive WSNs. At the same time, security is most important to prevent outsiders (illegitimate party) from retrieving the correct information. However, traditional security methods are not suited for WSN because they are not efficient from the perspective of energy, while energy conservation is a pivotal issue in WSN. This paper proposes a user authentication mechanism to countermeasure the outside attacks.
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