Abstract
Fuzzy extractor can be used to convert the reading of a noisy non-uniform source into a reliably reproducible and almost uniform string, while reusable fuzzy extractor allows multiple extractions of the same source. In this paper, we propose multi-party fuzzy extractor, called threshold reusable fuzzy extractor, whose execution requires a threshold number of members. New definition and efficient construction are given with security proofs and experimental implementations. It preserves the inherent properties of fuzzy extractor with expanded use in multi-party scenarios. Based on the proposed threshold reusable fuzzy extractor, an application in privacy protection is given to store and share sensitive data by smart contract on blockchain, achieving joint access control via biometric information.
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