In-network data aggregation is an essential technique in mission criticalwireless sensor networks (WSNs) for achieving effective transmission and hencebetter power conservation. Common security protocols for aggregated WSNs areeither hop-by-hop or end-to-end, each of which has its own encryption schemesconsidering different security primitives. End-to-end encrypted dataaggregation protocols introduce maximum data secrecy with in-efficient dataaggregation and more vulnerability to active attacks, while hop-by-hop dataaggregation protocols introduce maximum data integrity with efficient dataaggregation and more vulnerability to passive attacks. In this paper, we propose a secure aggregation protocol for aggregated WSNsdeployed in hostile environments in which dual attack modes are present. Ourproposed protocol is a blend of flexible data aggregation as in hop-by-hopprotocols and optimal data confidentiality as in end-to-end protocols. Ourprotocol introduces an efficient O(1) heuristic for checking data integrityalong with cost-effective heuristic-based divide and conquer attestationprocess which is $O(\ln{n})$ in average -O(n) in the worst scenario- forfurther verification of aggregated results.
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