Blockchain-Based E-Voting With Zero-Knowledge Proof Using Smart Contracts

Abstract

The data of the public block chain, being available to all nodes, it is necessary to hide the vote preference of the voter, and preserve the integrity of the casted vote, while at the same time, it is necessary to show that the voter has already voted, to prevent someone from casting multiple votes. This thesis work proposes an e-voting system using block chain and its smart contract as the rule setter. Here, with the help of the Paillier Cryptography system, the zero knowledge proof was accomplished. The zero knowledge proof here was used to show that the voter has already voted while at the same time, hiding the casted vote. The homo-morphic additive property of the Paillier cryptography system was used to perform addition on the encrypted cipher texts without the need to decrypt the cipher text to reveal the votes in the process. In the end, a secure voting mechanism was achieved.