Welcome to the resource topic for 2023/1554
Title:
Cornucopia: Distributed randomness beacons at scale
Authors: Miranda Christ, Kevin Choi, Joseph Bonneau
Abstract:We propose Cornucopia, a distributed randomness beacon protocol combining accumulators and verifiable delay functions. Cornucopia extends the Unicorn protocol of Lenstra and Wesolowski, utilizing an accumulator to enable efficient verification by each participant that their randomness contribution has been included in the beacon output.
The security of this construction reduces to a novel property of accumulators, insertion security. We first show that not all accumulators are insertion-secure. We then prove that common constructions (Merkle trees and RSA accumulators) are naturally insertion-secure. Finally, we give a generic transformation from any universal accumulator (supporting non-membership proofs) to an insertion-secure accumulator, albeit with an efficiency loss proportional to the security parameter.
ePrint: https://eprint.iacr.org/2023/1554
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