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• W3175791793 abstract "Having shared access to high-quality random numbers is essential in many important applications. Yet, existing constructions of distributed random beacons still have limitations such as imperfect security guarantees, strong setup or network assumptions, or high costs. In this paper, we present Spurt, an efficient distributed randomness beacon protocol that does not require any trusted or expensive setup and is secure against a malicious adversary that controls up to one-third of the nodes in a partially synchronous network. We formally prove that each output of Spurt is unpredictable, bias-resistant, and publicly verifiable. Spurt has an amortized total communication cost of $O(lambda n^{2})$ per beacon output where $lambda$ is the security parameter. While designing Spurt, we also design a publicly verifiable secret sharing (PVSS) scheme whose security is based on the standard Decisional Bilinear Diffie-Hellman assumption and does not require a Random Oracle. We implement Spurt and evaluate it using a network of up to 128 nodes running in geographically distributed AWS instances. Our evaluation shows that Spurt can produce about 84 beacon outputs per minute in a network of 32 nodes and is comparable to systems with stronger assumptions or weaker security." @default.
• W3175791793 created "2021-07-05" @default.
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• W3175791793 date "2022-05-01" @default.
• W3175791793 modified "2023-10-05" @default.
• W3175791793 title "Spurt: Scalable Distributed Randomness Beacon with Transparent Setup" @default.
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• W3175791793 doi "https://doi.org/10.1109/sp46214.2022.9833580" @default.
• W3175791793 hasPublicationYear "2022" @default.
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