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Large-scale wireless sensor network (WSN) deployments show great promise for military, homeland security, and many other applications. This promise, however, is offset by important security concerns. The resource constraints that typify wireless sensor devices make traditional security solutions impractical. One threat to secure sensor networks is the replay attack, in which packets are captured and replayed into the network. This type of attack can be perpetrated to confuse observers or to mount a denial-of-service or denial-of-sleep attack. Traditional techniques for anti-replay protection are too resource intensive for large-scale WSN deployments. While techniques for reducing data transmission overhead of WSN-speciflc anti-replay mechanisms have been explored, the important problem of minimizing per-node reply table storage requirements has not been addressed. This paper introduces Clustered Anti …