Decentralized Data Aggregation: A New Secure Framework based on Lightweight Cryptographic Algorithms

Blockchain has become very popular and suitable to the Internet of Things (IoT) field due to its non-tamperabaility and decentralization properties. The number of IoT devices and leaders (who own IoT devices) is increased exponentially, and thus data privacy and security are undoubtedly significant concerns. In this paper, we summarize some issues for the BeeKeeper system, a blockchain-based IoT system, proposed by Zhou et al., and then aim for presenting an improved solution for dencentralized data aggregation (DDA) on IoT. We propose our DDA system by using secret sharing to improve its efficiency, and smart contracts as the computing processors. In order to achieves data sharing (e.g., a leader to access data of others' devices), we use local differential privacy and cryptographic primitives such as token-based encryption. Finally, to show the feasibility, we provide some implementations and experiments for the DDA systems.