Deployment Based Attack Resistant Key Distribution with Non Overlapping Key Pools in WSN

摘要

Many current key management schemes do not effectively consider the attack probability and assume it to be same for every sensor node. However, for some applications like disaster management and military surveillance, attacks on sensor nodes may occur with different probabilities. In this paper, we have proposed a deployment based attack resistant key distribution for cellular model of wireless sensor networks. The main strength of the proposed scheme lies in incorporating the concepts such as the node density of the cell, the neighbor influence factor, gradient distance, placement of the sink node and the type of application running on the nodes to construct the attack matrix of each cell of the network. The domain key pool of the cell is further extended by the sharing of adjacent sub key pools followed by the hash computation on the keys and combining the hash computed keys with the original keys. This improves the probability of connectivity and storage overhead of the proposed scheme. To improve the resilience against the node capture attack and the communication overhead, the key pool is partitioned into three non overlapping sub key pools and the keys are hashed based on the cell and the node's identifiers. It is also shown that the proposed scheme performs better in terms of the probability of connectivity and the computation overhead when compared with existing schemes.