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Abstract:In recent years implementation of wireless sensor network has been widely done by many organizations and researcher are working on independent and autonomous wireless node in order to make it usable at different environment and location where maintenance is not feasible every time. Many wireless device work on configuration stored on storage of device. The main challenge with these wireless nodes is that, it requires a physical connection in order to change its configurations or the setting. It may possible that wireless nodes are moving and working on selfgenerated power supply hence it become very tedious to find those device for manual configuration. Thus it aimed at designing and implementation of secure reconfiguration protocol for wireless sensor network where device will be having a provision to connect device and get the new setting and overwrite with existing configuration in device. The wireless device will be having different mode like command and action mode. While configuration device will switched to secure configuration mode and get the details from base station and reconfigure its setting for future use.

Wireless Sensor networks are a special category of adhoc networks that are used to provide a wireless communication infrastructure among the sensors deployed in a specific application domain. The mobile sink does not have a wide range as a base station but has a rechargeable battery and so it can act as a collector for getting data from sensor nodes and transmitting it to base station via cellular network. However, when sensor networks with mobile sinks are deployed in a hostile environment, security becomes an important issue. Thus security schemes like mobile sink's authentication and pairwise key establishment are needed for secure functioning of such networks. There are some key predistribution schemes to improve the authentication. But in these schemes, an attacker can easily gain control on the entire network by deploying a replicated mobile sink. To overcome this problem we proposed a general three-tier security framework for authentication and pair wise key establishment between mobile sinks and sensor nodes. We propose a new fourteen square algorithm to encrypt the data using which it becomes very difficult for the intruder suspects to steal the data.keywords: wireless sensor networks(WSN), mobile sink(MS), fourteen square encryption algorithm (FSEA), pairwise key establishment.