International Journal of Computer Applications
Wireless Sensor Networks (WSNs) has foreseen big changes in data gathering, processing and disseminating for monitoring specific applications such as emergency services, disaster management, and military applications etc. Since large number sensor nodes are deployed to monitor a vast field, where the operational conditions are most often harsh or even hostile so security mechanism in WSN is a greater challenge in WSN. Sensor networks pose unique challenges because of their inherent limitations in communication and computing. Sensor networks are vulnerable to security attacks due to the broadcast nature of transmission.