Reference : RepuCoin: Your Reputation is Your Power
Scientific journals : Article
Engineering, computing & technology : Computer science
Security, Reliability and Trust
RepuCoin: Your Reputation is Your Power
Yu, Jiangshan []
Kozhaya, David []
Decouchant, Jérémie mailto [University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > >]
Verissimo, Paulo [University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > >]
IEEE Transactions on Computers
Institute of Electrical and Electronics Engineers
Yes (verified by ORBilu)
Los Alamitos
[en] Blockchain ; Cryptocurrency ; Fault-Tolerance ; Consensus
[en] Existing proof-of-work cryptocurrencies cannot tolerate attackers controlling more than 50% of the network’s computing power at any time, but assume that such a condition happening is “unlikely”. However, recent attack sophistication, e.g., where attackers can rent mining capacity to obtain a majority of computing power temporarily, render this assumption unrealistic. This paper proposes RepuCoin, the first system to provide guarantees even when more than 50% of the system’s computing power is temporarily dominated by an attacker. RepuCoin physically limits the rate of voting power growth of the entire system. In particular, RepuCoin defines a miner’s power by its ‘reputation’, as a function of its work integrated over the time of the entire blockchain, rather than through instantaneous computing power, which can be obtained relatively quickly and/or temporarily. As an example, after a single year of operation, RepuCoin can tolerate attacks compromising 51% of the network’s computing resources, even if such power stays maliciously seized for almost a whole year. Moreover, RepuCoin provides better resilience to known attacks, compared to existing proof-of-work systems, while achieving a high throughput of 10000 transactions per second (TPS).
Interdisciplinary Centre for Security, Reliability and Trust (SnT) > Critical and Extreme Security and Dependability Research Group (CritiX)

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