Computer Networks Project Application

The project is not running using a concurrent server.

The application will allow for transfer of data:

• From the client to the server(server here will act like a file backup, can be external to the users folder)
• The current program can handle only 1 client at a time. First the first client is served then the next client will be served - One at a Time. The current version is capable of handling multiple client connections to the server. But the connections are not multithreded, there is a single TCP welcoming socket and an individual connection socket created (and closed) for each client communication. To make this work with multiple clients at the same time - multi-threaded application using socket.
• The program supports sending a file from a client folder to a server folder, the user will have to change these folders to transfer files.
• The program encrypts the files in transit using AES in Block Cipher Mode with a 128-bit key for encryption during transit using symmetric key encryption facilitated by the Fernet library.
• The files to be sent are located from the file system using os module

Python

1. socket
2. fernet
3. os

• Encryption during transit
• File transfer from client to server
• Support for multiple clients
• Can be used to backup onto a different folder on another device in LAN

Will not work if there is a firewall

• Support for a wide variety of file types - txt, script

Cryptography module needs to be installed, other modules are built-in

pip install cryptography

Clone the repository using

git clone https://github.com/AlanJoji/EcrypTransf.git

And enter the working directory

cd EcrypTransf

A server terminal for running the server side to receive the file(s)

python server.py

A client terminal for running the client side to send the file(s)

python client.py

• File backup system
• Multi-threading socket creation