Secure Data Transmission in Wireless Sensor Networks : Against Packet Dropping Attacks

Wireless sensor network increases its application in industrial field as well as in consumer application very rapidly. Its growth increases day by day. Sensor node normally senses the physical event from the environment such as temperature, sound, vibration, pressure etc. Sensor nodes are connected with each other through wireless medium such as infrared or radio waves it depends on applications. Each node has its internal memory to store the information regarding the event packets. Basically this whole sensor network called sensor net is working in a distributive manner, sensor nodes are deployed in a huge area and use to send data packet in broadcast manner. This data packet finally reaches to the base station or called sink and vice versa. Nodes are deployed over a huge region in an ad-hoc based manner and use to sense the physical events. If any region cannot be sensed by any nodes then that region is called blind area. If blind area is too large then data retrieval is become unreliable. Nodes normally works in a collaborative manner to perform a specific task by transferring data packet to its neighbor nodes and so on until it reached to the base station. Every node has its own transmission range and within this transmission range node can transmit data packet. The event packet which sensor node transmit may be secret or confidential for the application , so the data transmission must be secured to maintain the confidentiality of data packets.