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Data aggregation is a widely used technique in wireless sensor networks. There has been many related work proposed to address the data aggregation. However less of them pay attention to the property of data integrity. An attacker can simply forge data to affect the decision of base station by compromised nodes. We, therefore, propose a lightweight secure data aggregation protocol to find the compromised nodes and help the base station to verify the final results. Finally, we provide detailed security analyses to verify security of our scheme.