FPTD: Super Fast Privacy-Preserving and Reliable Truth Discovery for Crowdsensing

초록

Crowdsensing has gained widespread attention due to its efficient and low cost data collection mode that leverages a large number of intelligent mobile devices. Privacy and data quality are two key concerns in crowdsensing. Recently, extensive efforts have been devoted to privacy-preserving truth discovery (PPTD), which aims to protect sensitive data while improving data quality. However, existing PPTD schemes suffer from either low reliability—especially under collusion attacks and server dropout—or low communication efficiency. As a result, they fail to meet the practical requirements of real-time processing with high reliability. To address the problems, we propose FPTD, a super fast PPTD scheme for crowdsensing that provides Tout-of-N threshold reliability, with a focus on boosting online efficiency. Our scheme employs edge nodes as servers in a multi-server architecture, resisting up to (T−1) colluding servers and (N−T) server dropouts. We construct novel protocols for PPTD, including secure division and negative of approximate logarithms. We further significantly improve communication efficiency by designing protocols multiply-then-divide, dot-product-then-divide, and filter-then-dot-product-then-divide, all of which require only a single element per party in online communication. Our tradeoff is a need for a circuit-dependent offline phase, which is independent of the parties’ inputs. Compared to the state-of-the-art scheme, we are 13∼217× faster (LAN) and 17∼190× faster (WAN) in online execution time. © 2004-2012 IEEE.

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