[en] The emergence of distributed digital currencies has raised the need for a reliable consensus mechanism. In proof-of-stake cryptocurrencies, the participants periodically choose a closed set of validators, who can vote and append transactions to the blockchain. Each validator can become a leader with the probability proportional to its stake.Keeping the leader private yet unique until it publishes a new block can significantly reduce the attack vector of an adversary and improve the throughput of the network. The problem of Single Secret Leader Election(SSLE) was first formally defined by Boneh et al. in 2020. In this work, we propose a novel framework for constructing SSLE protocols, which relies on secure multi-party computation (MPC) and satisfies the desired security properties. Our framework does not use any shuffle or sort operations and has a computational cost for N parties as low as O(N) of basic MPC operations per party. We improve the state-of-the-art for SSLE protocols that do not assume a trusted setup. Moreover, our SSLE scheme efficiently handles weighted elections. That is, for a total weight S of N parties, the associated costs are only increased by a factor of log S. When the MPC layer is instantiated with techniques based on Shamir’s secret-sharing, our SSLE has a communication cost of O(N^2) which is spread over O(log N) rounds, can tolerate up to t < N/2 of faulty nodes without restarting the protocol, and its security relies on DDH in the random oracle model. When the MPC layer is instantiated with more efficient techniques based on garbled circuits, our SSLE re-quires all parties to participate, up to N−1 of which can be malicious, and its security is based on the random oracle model.
Disciplines :
Sciences informatiques
Auteur, co-auteur :
Backes, Michael; CISPA Helmholz Center for Information Security > Information Security & Cryptography
Berrang, Pascal; University of Birmingham > School of Computer Science
Hanzlik, Lucjan; CISPA Helmholz Center for Information Security
PRYVALOV, Ivan ; University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > APSIA
Co-auteurs externes :
yes
Langue du document :
Anglais
Titre :
A framework for constructing Single Secret Leader Election from MPC
Date de publication/diffusion :
2022
Nom de la manifestation :
27th European Symposium on Research in Computer Security (ESORICS) 2022
Lieu de la manifestation :
Kopenhagen, Danemark
Date de la manifestation :
from 26-09-2022 to 30-09-2022
Titre de l'ouvrage principal :
Computer Security – ESORICS 2022
Peer reviewed :
Peer reviewed
Projet FnR :
FNR14698166 - Future-proofing Privacy In Secure Electronic Voting, 2020 (01/01/2021-31/12/2023) - Johannes Mueller
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