A simple, secure file transfer utility using post-quantum cryptography for the key exchange. This project features a client-server architecture running inside Docker.

Features

Post-Quantum Security: Uses the Kyber768 algorithm from the liboqs library to establish a secure channel, protecting against future quantum threats.
Containerized Server: The server runs in a Docker container for easy deployment and dependency management.
CLI Interface: The client provides a simple command-line interface for uploading files.
Compression: Uses zlib to compress files before transfer to save bandwidth.
Authentication: Implements a basic username/password authentication scheme.

Prerequisites

Server (via Docker)

Docker
Docker Compose

Client (Local Machine)

A C++ compiler (g++)
make
git
liboqs installed locally (see build instructions).
zlib (zlib1g-dev on Debian/Ubuntu).

How to Run

1. Start the Server

From the project's root directory, build and run the server using Docker Compose.

docker-compose up --build -d

The -d flag runs the server in the background.
To view server logs: docker-compose logs -f
To stop the server: docker-compose down

2. Build and Run the Client

First, ensure you have the client-side dependencies installed.

# Install build tools and zlib
sudo apt update
sudo apt install g++ make git zlib1g-dev ninja-build cmake

# Install liboqs
git clone --branch 0.10.2 [https://github.com/open-quantum-safe/liboqs.git](https://github.com/open-quantum-safe/liboqs.git)
cd liboqs
mkdir build && cd build
cmake -GNinja ..
ninja
sudo ninja install
cd ../.. # Go back to project root

Now, navigate to the client directory and compile the client:

cd client
make

Run the client:

./bin/client

Usage

Once the client is running, you can use the following commands:

Upload a file:
```
> put /path/to/your/local/file.txt
```
Exit the client:
```
> exit
```

Transferred files will appear in the pq-ftp/server/transfer directory on the host machine.

License

This project is licensed under the MIT License. See the LICENSE file for details.