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Key management plays an essential role in achieving security in wireless sensor networks (WSNs). A range of new key distribution schemes have been suggested in an attempt to improve existing ones which are inappropriate for WSNs. However these schemes are still vulnerable when a certain number of sensor nodes are captured. The key distribution proposed in this paper makes use of coordinator sensor nodes, increasing the number of nodes that would need to be captured by an adversary. The analysis of our scheme against well known schemes such as the DDHV scheme shows a significant improvement in security.