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Data aggregation is an efficient technique for reducing communication cost in wireless sensor networks. However it is vulnerable to false data injection attacks where the adversary node sends false data to the aggregation node and thus, stops the base station to acquire correct data. This paper proposes a secured data aggregation protocol which detects the false data injection during the data aggregation and identifies the adversary node. The protocol is lightweight because it requires only a minimal cryptographic techniques, and takes O(n) time for both data aggregation and tracking back the attacker.