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This paper proposes a secure data aggregation scheme for clustered wireless sensor networks. In our design, the encrypted sensor readings were transmitted to the cluster head with MAC and the cluster head process the encrypted data aggregation without decryption. For the readings have the same value and come from different nodes, the cluster head remains the node's identifiers in data aggregation processing to provide the information of global data distribution. Compared with related works, except providing data privacy protection, our scheme had better performances in resilient against active attack, node compromise attack and DoS attack.