Energy Efficient Dynamic Mixed Key Management Scheme based on Virtual Grid in Wireless Sensor Netwoks

Wireless sensor networks are often deployed in hostile environments and operated on an unattended mode require secure communication among the sensor nodes within the networks. In this paper, we present an energy efficient dynamic mixed key management based on virtual grid for wireless sensor networks.First,we divide the whole area into many clusters and a cluster is composed of many virtual grid,and there is only a active node in a grid to reduce energy consumption;Second,we introduce the typical energy model to compute energy consume and a long sleeping state to reduce energy consumption. In addition, we adopt mixed strategy to achieve dynamic key management,namely,we use two key to achieve active node communicate with cluster head,which the random key is generates by active nodes and head,then generate public key;while we use pairwise key to communicate with neighbor cluster heads which has the different pairwise key for different heads.Compared with the random key based predistribution schemesin, q-composite scheme,our scheme has better performance on security and storage overhead.