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Wireless sensor networks (WSN) is a network that plays an important role in the field of research, an emerging technology. NIST (National Institute of Standards and Technology) explains WSN as “a network that consists of the large number of sensors called wireless sensors deployed ingeographical area and the environment”. A System that consists of actuators and sensors is referred as a sensor network including some of the computing elements. WSN contains the sensors nodes, which senses the physical quantities of the surroundings. Wireless sensor network became most famous in recent years for both military and civil jobs. One of the most challenging task for WSN is security which is unprotected in an open environment. Cryptographic technique is not much better that is to protect sensor network from outside attacks.