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Security mechanism is a fundamental requirement of wireless networks in general and Wireless Sensor Networks (WSN) in particular. Therefore, it is necessary that this security concern must be articulate right from the beginning of the network design and deployment. WSN needs strong security mechanism as it is usually deployed in a critical, hostile and sensitive environment where human labor is usually not involved. However, due to inbuilt resource and computing restriction, security in WSN needs a special consideration. Traditional security techniques such as encryption, VPN, authentication and firewalls cannot be directly applied to WSN as it provides defense only against external threats. The existing literature shows that there seems an inverse relationship between strong security mechanism and efficient network resource utilization.
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