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SecureVotingDapp

A secure and decentralized voting system on the Ethereum blockchain, featuring secret voting, vote delegation, and transparent winner determination.

Description

SecureVotingDapp is a smart contract-based voting system that ensures privacy and security through time-limited secret voting. It allows voters to cast their votes anonymously and reveal them after the voting period, ensuring transparency and integrity.

I used the existing basic solidity example about voting contract given in the documentation and modified it. My modified voting contract is more secure because it uses Time-LimitedVotingPeriod and SecretVoting

Time-Limited Voting Period

  • The contract constructor now accepts a duration for the voting period in minutes.
  • startTime and endTime are set based on the current block timestamp.
  • Modifiers onlyDuringVoting and onlyAfterVoting ensure certain functions can only be called during or after the voting period, respectively.

Secret Voting

  • The vote function now takes an encrypted vote (secretVote) as input.
  • The revealVote function allows voters to reveal their vote after the voting period by providing the proposal index and a secret key used to encrypt the vote.
  • Encrypted votes are stored during the voting period and are only counted when revealed after the voting period ends.

How It Works

  1. Voting: During the voting period, voters submit encrypted votes.

  2. Revealing Votes: After the voting period ends, voters reveal their votes by submitting the proposal index and the secret used to encrypt their vote.

  3. Counting Votes: Votes are only counted once they are revealed, ensuring that votes are secret during the voting period.

Features

  • Time-Limited Voting: Allows voting within a specified period.
  • Secret Voting: Voters submit hashed votes to keep their choices private during the voting period.
  • Vote Delegation: Voters can delegate their voting rights to another trusted voter.
  • Secure Vote Reveal: Votes are revealed and validated after the voting period using a secret key.
  • Transparent Results: The winning proposal is determined and can be viewed after the voting period ends.

Getting Started

Prerequisites

  • Solidity compiler (version ^0.7.0 or newer)
  • npm ethers package
  • VSCode(for development tools)
  • Solidity extensions in VSCode

Installation

  1. Clone the repository 
    git clone https://github.com/your-username/SecretVotingDapp.git
cd SecretBallot
  2. Copy the modifiedVoting.sol file
  3. Run it in the online Solidity compiler remix
  4. To get the bytesParsed voter address, I used the file "createBytesParse.js" from my parsing folder.
  5. Run and deploy it in remix using those addresses.

Usage

Constructor

constructor(bytes32[] memory proposalNames, uint durationMinutes)
  • proposalNames: Array of proposal names (up to 32 bytes each).
  • durationMinutes: Duration of the voting period in minutes.

Added Functions

  • vote(bytes32 secretVote) Casts a secret vote. Can only be called during the voting period.

  • revealVote(uint proposal, bytes32 secret) Reveals and validates your vote after the voting period.

Existing Functions

  • giveRightToVote(address voter) Grants a voter the right to vote. Can only be called by the chairperson.

  • delegate(address to) Delegates your vote to another voter. Can only be called during the voting period.

  • winningProposal() public view returns (uint) Computes the winning proposal after the voting period.

  • winnerName() public view returns (bytes32) Returns the name of the winning proposal after the voting period.

Events

  • VoteRevealed(address indexed voter, uint proposal) Emitted when a vote is revealed.

Learning

I learned basics Solidity within 3 days and built this app to test my knoweldge. I went through the Solidity documentation of voting contract tutorial to learn the basics of contract. I also used this video to understand every component of the basic codebase of how voting contract works.