ABSTRACT
The Defense Advanced Research Projects Agency's (DARPA) program named SmartDust describes the Wireless Sensor Networks (WSN) as follows: A sensor network is a deployment of massive numbers. Current-day research focuses on low-power WSN deployed on a large scale. The primary driver for research on WSN is the DARPA Information Science and Technology in the United States. Service availability of the network, its confidentiality, and also taking into account the integrity of data and many more such constraints can be achieved by optimizing the security issues in the network. A holistic view to ensure layered and robust security in WSN is presented. The state of the art demonstrates various WSN security protocols, examines them, and puts forward a comparison of the techniques depicting their strength and weaknesses. The sensor nodes in a WSN are equipped with 2 AA batteries which have a life span.
