The Wireless Sensor Networks (WSNs) protocols commonly use in network processing to optimize the communication costs. In-network processing involves processing of the sensed data on-the-fly during the course of the communication to the base station. However, due to the fusion of the data items sourced at different nodes into a single one, the security of the aggregated data as well as that of the aggregating node, demands critical investigation. One of the approaches to ensure secure data aggregation is to use encrypted sensor data for processing, using homomorphic encryption. Our research here is aimed to propose an approach that uses homomorphic encryption and appropriate data integrity mechanisms to offer confidentiality, privacy and data integrity for secure data aggregation in wireless sensor networks.
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