Abstract

AbstractFuzzy extractor retrieves the same cryptographic key from samples of one noisy source. Information-theoretically secure fuzzy extractors are usually constructed by secure sketches and seeded extractors. However, current constructions rely heavily on perfect randomness, which is difficult to obtain in the real world. In this paper, we analyze the security deficiency of current secure sketches and fuzzy extractors in the imperfect randomness setting where no perfect randomness is available. Furthermore, we discuss the information-theoretic security of several explicit fuzzy extractors based on two-source extractors in the imperfect randomness setting.KeywordsFuzzy extractorSecure sketchImperfect randomnessInformation-theoretic security

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