CSCI-6230 Project (Fall 2016)

This codebase is a proof of concept (PoC) of an e-voting system using Paillier homomorphic encryption.

Setup

The project was written using Python 3.5.2. To install dependencies (PyCrypto, etc), change to root project directory (the one containing requirements.txt) and run:

pip install -r requirements.txt

How to Run

Note: You can modify the number of candidates and number of voters in config.py

Run cleanup script (to clean stale state files)
```
python cleanup.py
```

Run Election Board (EM), Bulletin Board (BB) and Voter in that order.

# in Terminal 1 (Election Board - EM)
python em.py

# in Terminal 2 (Bulletin Board - BB)
python bb.py

# in Terminal 3 (Voter)
python voter.py

Voting will stop automatically when all voters have cast their vote. It can also be manually stopped by running close_voting.py
```
python close_voting.py
```

Voter IDs are of the pattern Voter00, Voter01, Voter02, etc. Voter's PIN is the same as his ID i.e. PIN for Voter00 is Voter00 and so on.

Assumptions

Keys are shared between Election Board (EM) and Bulletin Board (BB) in advance. Key sharing is secure and trusted.
Bulletin Board (BB) and Election Board (EM) systems are secure (i.e. adversary cannot control them and/or obtain keys).
Connection between Bulletin Board (BB) and Election Board (EM) is secure and trusted (e.g. communication happens over TLS/SSL and both servers know each others identity).
Election Board (EM) is, in reality, a group of individuals/institutions who possess secret key in t-n threshold sharing fashion. They decrypt their share of the final encrypted tally (they never physically come together) .
Any vulnerability in PyCrypto is out of scope

Authors

Muhammad Ishaq (ishaq@ishaq.pk)
Daniel Park (parkd5@rpi.edu)

Credits