Date Added: Jul 2011
The nodes of Wireless Sensor Networks (WSNs) are deployed in hostile environments faces the security problem of eavesdropping and capturing by an adversary. To achieve the security of this resource constraint device is a challenging task. This paper proposed a secured key management scheme for hierarchical WSNs that distributed the keys within a cluster efficiently and update the pre-deployed keys to mitigate the node compromised attack. The authors use one way hash function and random variable that broadcasted to update the pre-deployed keys.