Wireless sensor networks are vulnerable to node capture attacks because sensor nodes are usually deployed in unattended manner. Once attacker captures sensor nodes, he can compromise them and launch various types of attacks with those compromised nodes. Therefore, node capture attacks are hazardous and should be detected as soon as possible to reduce the harm incurred by them. To meet this need, we propose a node capture detection scheme in wireless sensor networks. Our scheme detects the

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... ed sensor nodes by using the sequential analysis. We analytically show that our scheme detects node capture attacks in robust and efficient manner.