isabella232 / sample-e-voting-system-ethereum

E- Voting:

Electoral integrity is essential not just for democratic nations but also for state voter’s trust and liability. Political voting methods are crucial in this respect. From a government standpoint, electronic voting technologies can boost voter participation and confidence and rekindle interest in the voting system.

The electronic voting protocols have a single controller that oversees the whole voting process. This technique leads to erroneous selections due to the central authority’s dishonesty (election commission), which is difficult to rectify using existing methods. The decentralized network may be used as a modern electronic voting technique to circumvent the central authority.

Electronic voting systems must be legitimate, accurate, safe, and convenient when used for elections. It has great potential to decrease organizational costs and increase voter turnout. It eliminates the need to print ballot papers or open polling stations—voters can vote from wherever there is an Internet connection.adoption may be limited by potential problems associated with electronic voting systems. Blockchain technology came into the ground to overcome these issues and offers decentralized nodes for electronic voting and is used to produce electronic voting systems mainly because of their end-to-end verification advantages.

Problem Statement

Solution

Implementation of electronic voting:

Required:

• Aadhar card as user unique indentification.
• Smart Contract consisting of all the rules and protocols required for e-voting.
• Blockchain Network to deploy the Contract. We have used Rinkeby for our contract.
• Website for user Interface where voter can vote. We have created webpage with React & Native Base.

Assumptions:

• Digital print of the Voters (Aadhar card) containing all the info with voting eligibility data like age, constituency code, Indian Penal Code information etc updated by Govt. of India.
• Eligible voters have to register themselves in the constituency where they live, upon which Govt. will update all the info to Aadhar card. Individuals are not permitted to participate in the electoral process if they have not registered or do not possess an Aadhar card.
• Only Election Chief can start/update Voting session.
• One nation one election

Who can Vote:

• As per the Indian Constitution, all Indian citizens above the age of 18 years who have registered themselves as voters are eligible to vote. These individuals can vote in national, state, district as well as local government body elections.
• No individual can be detained or prevented from voting, unless they fulfil the criteria for disqualification. Every voter is allowed one vote only. A voter can vote at the constituency where he has registered himself.
• Aadhar card should be valid and linked with constituency code.

Who cannot vote:

• If an individual votes in more than one constituency, his vote is disqualified.
• Already casted vote.
• Voter’s constituency code not matched with ongoing Election constituencies.

How can you vote:

• Login via Aadhar no. and otp
• If your Aadhar’s constituency code matches with ongoing election, it will show you the Election Vote dashboard else you are not allowed to vote. If the election process is still going on, it will give the option to vote.

  Click Vote -> Select Candidate -> Done

• Vote Casted to selected Candidate
• Final Candidate List with vote count will be displayed after the election voting process is completed.
• You are not allowed to vote/update-vote to different candidate again.
• You are not allowed to vote after Election session ends.

e-Voting Requirements and Compliance by the Proposed System

• Privacy - Keeping an individual’s vote secret

• Eligibility - Allowing only registered voters to vote, with each such voter voting only once

• Receipt Freeness - Voters should be unable to prove to a third party that they voted in a particular way

• Convenience - Voters must be able to vote easily, and everyone who is eligible must be able to vote

• Verifiability - The ability to trust the vote tallying process

Let's start with E-Voting Smart Contracts

Do platform Setup!

Solidity Functions

Modifiers

    /**
     * @notice To check if the voter's age is greater than or equal to 18
     * @param currentTime_ Current epoch time of the voter
     */
    modifier votingLinesAreOpen(uint256 currentTime_) {
        require(currentTime_ >= votingStartTime);
        require(currentTime_ <= votingEndTime);
        _;
    }

    /**
     * @notice To check if the voter's age is greater than or equal to 18
     * @param voterAadhar_ Aadhar number of the current voter
     * @param candidateAadhar_ Aadhar number of the candidate
     */
    modifier isEligibleVote(uint256 voterAadhar_, uint256 candidateAadhar_) {
        Voter storage voter_ = voter[voterAadhar_];
        Candidate storage politician_ = candidate[candidateAadhar_];
        require(voter_.age >= 18);
        require(voter_.isAlive);
        require(!voter_.voted);
        require(
            (politician_.stateCode == voter_.stateCode &&
                politician_.constituencyCode == voter_.constituencyCode)
        );
        _;
    }

    /**
     * @notice To check if the user is Election Chief or not
     */
    modifier isElectionChief() {
        require(msg.sender == electionChief);
        _;
    }

Voting timelines

• Voting will only be opened between a particular date(s) & election chief has the right to update the start & end dates of the voting process.
• start date can only be updated only if the voting process is not started yet
• Can extend the voting end date after the voting is started & before the voting is ended

    /**
     * @dev used to update the voting start & end times
     * @param startTime_ Start time that needs to be updated
     * @param currentTime_ Current time that needs to be updated
     */
    function updateVotingStartTime(uint256 startTime_, uint256 currentTime_)
        public
        isElectionChief
    {
        require(votingStartTime > currentTime_);
        votingStartTime = startTime_;
    }

    /**
     * @dev To extend the end of the voting
     * @param endTime_ End time that needs to be updated
     * @param currentTime_ Current time that needs to be updated
     */
    function extendVotingTime(uint256 endTime_, uint256 currentTime_)
        public
        isElectionChief
    {
        require(votingStartTime < currentTime_);
        require(votingEndTime > currentTime_);
        votingEndTime = endTime_;
    }

Results

Everyone can check the voting results once the voting lines are closed

    /**
     * @dev sends all candidate list with their votes count
     * @param currentTime_ Current epoch time of length 10.
     * @return candidateList_ List of Candidate objects
     */
    function allCandidatesWithVoteCount(uint256 currentTime_)
        public
        view
        returns (Candidate[] memory)
    {
        // use "assert" for internal errors where as required for both internal & external
        require(votingEndTime < currentTime_);
        return candidates;
    }

Voting Methods

Function name	Modifiers	Description
isVoterEligible()	Any	To check whether voter is eligible to vote or not based on the pre-defined assumptions like the age greater than or equal to 18 & is alive
didCurrentVoterVoted()	Any	To check if the current voter has casted their or not. If voted then returns the candidate object to whom he/she casted their vote to
getCandidateList()	Any	To get the list of candidates who belongs to the current voter constituency
getVotingEndTime()	Any	To get the voting end time
updateVotingStartTime()	isElectionChief()	To update the voting start date & time (Can only be called prior to voting start)
extendVotingTime()	isElectionChief()	To extend the voting timelines (Can only be done once voting process starts & before the voting ends)
vote()	votingLinesAreOpen() isEligibleVote()	To cast one's vote to a particular candidate who belong to their own constituency
getResults()	Any	To get the voting results. Can be called by anyone but only after the voting lines are closed

Versions

Compiler: solc: 0.8.12+commit.f00d7308

Truffle: v5.5.2

Node: v14.17.0

Deployed to Rinkeby

Contract Address: https://rinkeby.etherscan.io/address/0x259C637f62301218125834396187f29333BD776C

Contract Creator: https://rinkeby.etherscan.io/address/0xF2C9ef86c3c98Fc8C265469624dA35af2D72Fa06

Tx Hash of contract creation :https://rinkeby.etherscan.io/tx/0xc35311bd36315d43e6e3c2694c2f070733675d2f2e96acb8257e503c977f53da

Quick Start

1. cd into project repro

   cd E-Voting
   cd blockchain
   

2. download node libraries

   npm install
   

3. Download/Start ganache

https://truffleframework.com/ganache

4. Compiling contracts

   truffle compile
   

5. Migrating to ganache

Note depending on ganache cli/ui you my need to change truffle.js port settings Current listing on port : 7545

    truffle migrate --network development  --reset --all

6. Testing on ganache

   truffle test
   

7. Switch to FrontEnd & Testing

Note Change settings to your Contract address to point to local

      cd ..
      cd front-end
      npm install
      npm start

8. Migrating to Rinkeby

Note Change truffle settings to your Contract Creator address within the "from" rinkeby configuration

    truffle migrate --network rinkeby  --reset --all

9. Start FrontEnd on Rinkeby

Note Revert back all your local configurations & configure it to point to rinkeby

    npm start

Test Voters

User Name	Aadhar Number	State	Constituency	Age	isAlive
Suresh	482253918244	Andhra Pradesh	Guntur	21	✅
Ramesh	532122269467	Andhra Pradesh	Guntur	37	❎
Mahesh	468065932286	Andhra Pradesh	Guntur	26	✅
Krishna	809961147437	Andhra Pradesh	Krishna	19	✅
Narendra	908623597782	Andhra Pradesh	Krishna	36	✅
Raghu	760344621247	Andhra Pradesh	Krishna	42	✅
Pushkar Kumar	908704156902	Bihar	Patna	25	✅
Kunal Kumar	778925466180	Bihar	Patna	37	✅
Kumar Sanket	393071790055	Bihar	Dehri	29	✅
Pratik	983881786161	Bihar	Dehri	40	✅
Aausi	756623869645	Bihar	Patna	85	❎
Pratiba	588109459505	Bihar	Dehri	68	❎
Ruchika	967746320661	West Bengal	Kolkata	26	✅
Rambabu	727938171119	West Bengal	Kolkata	17	✅
Matajii	609015917688	West Bengal	Kolkata	98	✅
Mamata	620107691388	West Bengal	Asansol	63	❎
Ravi Varma	403561319377	West Bengal	Asansol	42	✅
Rahul	837970229674	West Bengal	Asansol	56	✅