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Wireless Sensor Networks (WSN) is a recent advanced technology of computer networks and electronics. The WSN increasingly becoming more practicable solution to many challenging applications. The sensor networks depend upon the sensed data, which may depend upon the application. One of the major applications of the sensor networks is in military. So security is the greatest concern to deploy sensor network such hostile unattended environments, monitoring real world applications. But the limitations and inherent constraints of the sensor nodes does not support the existing traditional security mechanisms in WSN. Now the present research is mainly concentrated on providing security mechanism in sensor networks.
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