Abstract

Wireless Sensor Network is a special type of network which finds its application in vast area. Though it is similar to ordinary network it is unique in its own way. Due to its efficiency and flexibility its application is increasing day by day. It is widely used in military applications, hospital, home applications, etc. Wireless Sensor Network senses or monitors various changes in the environment in which it is deployed. Since the wireless sensor network mainly finds its application in unattended areas it is vulnerable to several attacks. These attacks may be severe or may not be harmful.