SEBDA: A Secure and Efficient Blockchain Based Data Aggregation Scheme

Data aggregation plays a vital role in collecting and summarizing data in the Internet of Things (IoT). Data aggregation results are used to make a critical decision; therefore, the end-to-end integrity of the data aggregation result is of utmost importance. Recently, blockchain-based data aggregation approaches have been proposed that mainly focus on data confidentiality. However, existing approaches ignore two important requirements 1) the end-to-end integrity of data aggregation result and 2) the system's scalability. This paper proposes a blockchain-based data aggregation scheme to detect end-to-end integrity of aggregation results and identify malicious aggregators. Furthermore, we improve the efficiency and scalability of the system by leveraging a sidechain. Our simulation results indicate that the proposed system improves efficiency and scalability compared to conventional blockchain-based data aggregation.