This project implements a secure electronic voting system using cryptographic techniques to ensure the privacy, integrity, and authenticity of votes. The system leverages Shamir's Secret Sharing Scheme to achieve secure voting, share distribution, and vote counting.

• Voter Authentication: Voters are identified using a unique random ID and associated public-private key pair.
• Secure Vote Casting: Votes are encrypted and signed before being sent to external servers.
• Shamir's Secret Sharing: Votes are split into multiple shares, requiring a threshold number of shares to reconstruct the original vote.
• Vote Verification and Counting: The system ensures that votes are counted accurately and securely without revealing individual votes.

The project consists of several components, each with a specific role in the voting process:

1. Authority Center: The central server that initializes the election, manages voters, and aggregates final results.
2. Voting Terminal: The client-side application where voters cast their votes securely.
3. External Servers: Servers responsible for storing encrypted shares of votes and returning them upon request.
4. Voters: The voters registered for the election.
5. Socket Utilities: Functions for handling large data transfers over socket connections.

├── authority_center.py           # Authority Center server code
├── voting_terminal.py            # Voting Terminal client code
├── external_server.py            # External Server code
├── utils_server.py               # Socket utilities for sending/receiving large data
├── voter.py                      # Voter class with unique ID
├── config.sh                     # Set all the parameters of the election
├── make_authority.sh             # Run authority_center.py
├── make_terminal.sh              # Run voting_terminal.py
├── requirements.txt              # Required packages
└── README.md                     # This README file

• Python 3.6 or higher
• Required Python packages:
  • sympy (for modular arithmetic)
  • pycryptodome (for cryptographic operations)
  • tabulate (for printing table)

You can install all the required packages using pip:

pip -r install requirements.txt

1. Run the Authority Center: This central server is responsible for starting external servers, handling voter authentication, and aggregating votes.

   chmod +x make_authority.sh
   ./make_authority.sh

Make sure to run the authority center first.

2. Run the Voting Terminal: This client application allows voters to cast their votes.

   chmod +x make_terminal.sh
   ./make_terminal.sh

You can customize the election parameters in the config.sh file:

• --num_voters: Number of registered voters.
• --candidates: Comma-separated list of candidate names.
• --num_shares: Number of shares for secret sharing.
• --threshold: Threshold number of shares required to reconstruct the vote.
• --tolerance: Tolerance of corrupted vote.
• --duration: Duration of the election in minutes.
• --buffer_size: Buffer size for data transmission.
• --mode: Could be automatic or manual, for automatic simulation or manual casting.
• --N: Number of manual votes