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Electing democratic representatives via voting has been a common mechanismsince the 17th century. However, these mechanisms raise concerns aboutfairness, privacy, vote concealment, fair calculations of tally, and proxiesvoting on their behalf for the voters. Ballot voting, and in recent times,electronic voting via electronic voting machines (EVMs) improves fairness byrelying on centralized trust. Homomorphic encryption-based voting protocolsalso assure fairness but cannot scale to large scale elections such aspresidential elections. In this paper, we leverage the blockchain technology ofdistributing trust to propose a smart contract-based protocol, namely, \proto.There are many existing protocols for voting using smart contracts. We observethat these either are not scalable or leak the vote tally during the votingstage, i.e., do not provide vote concealment. In contrast, we show that FASTENpreserves voter's privacy ensures vote concealment, immutability, and avoidsdouble voting. We prove that the probability of privacy breaches is negligiblysmall. Further, our cost analysis of executing FASTEN over Ethereum iscomparable to most of the existing cost of elections.

FASTEN: Fair and Secure Distributed Voting Using Smart Contracts