An energy efficient dynamic key management scheme based on polynomial and cluster in wireless sensor netwoks

Abstract

Wireless Sensor Networks (WSNs) have a vast field of applications, including deployment in hostile environments. terrorist tracking and highway traffic monitoring requires secure communication among the sensor nodes within the networks. General key distribution schemes for traditional computer networks could not be directly shifted to wireless sensor network environments due to sensor nodes' wireless nature and operational resource constraints.In this paper, we present a new energy efficient dynamic key management for wireless sensor networks.First,we divide a cluster into many virtual grid,and there is only a active in a grid to reduce energy consumption;Second,we adopt different scheme to achieve dynamic key management,namely,we use pair-wise key based on common polynomial and random number to communicate with neighbor cluster heads and pre-distribution key based on head polynomial and random number for each active node to communicate between active node and head. Compared to existing key management scheme,our scheme has better performance on security and scalability.