Various Security Threats in Wireless Sensor Networks and their Defense Schemes

Wireless sensor network (WSN) is a set of organized sensor nodes, typically deployed out in areas which have to be contacted wirelessly and are generally difficult to access. A sensor node is able to sense surroundings, communicate the information gathered to other nodes and also comprise computational power. These networks are by far open to many security threats, as once these networks are deployed, they are defenseless and neglected. Many intrinsic attributes like small memory and inadequate battery make sensor networks difficult to utilize usual security solutions. The applications of omnipresent wireless sensor networks have amplified the complication gradually to classify wireless sensor network attacks and shield against them. Various types of weakness related with WSN and their consequence as well as countermeasures are discussed in this paper.