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Wireless sensor network (WSN) is one among the fast-emerging technologies which plays very important role in the research field and has become the integral part of the research. According to the standards of NIST (National Institute of Standards and Technology), “the WSN is a network with many sensors deployed in the environment or geographical area.” Sensor network is a system including actuators and sensors with some elements of computation. 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. The most challenging task for WSN is security which is unprotected in an open environment. Cryptographic technique is not much better that can protect a sensor network from external threats and attacks.