📁 Secure Network File Sharing System (Client–Server Model)

A secure C++ project implementing a client–server file sharing system using TCP sockets in Linux/WSL, supporting authentication, encrypted upload/download, file listing, server logging, and progress bars.

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✅ 1. Project Overview

This project demonstrates a secure file-sharing mechanism where:

• Users authenticate using a username & password.
• Files can be uploaded to the server.
• Files can be downloaded from the server.
• All server files can be listed.
• XOR encryption is used for secure transfer.
• Server logs all activities in server_log.txt.

This project covers Linux socket programming, encryption, client–server communication, and file transfer over TCP.

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✅ 2. Features

🔐 Authentication

Users authenticate using credentials stored in users.txt.

⬆️ Secure File Upload

• Encrypted file transfer
• Chunk-based upload
• Real-time progress bar
• Automatic save on server

⬇️ Secure File Download

• Encrypted transfer
• Progress bar
• Auto-save to /downloads/ folder

📂 File Listing

View all server files inside shared_files/.

🔒 XOR Encryption

Simple XOR-based encryption applied during upload/download.

📝 Server Logging

Every login, upload, download is logged in server_log.txt.

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✅ 3. Folder Structure

Assignment-4--Network-File-Sharing-Server-Client/
├── Client/
│ ├── client.cpp
│ ├── client
│ └── downloads/
│
├── Server/
│ ├── server.cpp
│ ├── server
│ ├── users.txt
│ ├── server_log.txt
│ └── shared_files/
│
├── screenshots/
│ ├── img1.png
│ ├── img2.png
│ ├── img3.png
│ ├── img4.png
│ ├── img5.png
│ ├── img6.png
│ ├── img7.png
│ ├── img8.png
│ ├── img9.png
│ ├── img10.png
│ ├── img11.png
│ ├── img12.png
│ ├── img13.png
│ ├── img14.png
│ └── img15.png
│
├── README.md
└── LICENSE

✅ 4. How to Run

▶️ Start the Server

cd Server
g++ server.cpp -o server
./server

▶️ Start the Client

cd Client
g++ client.cpp -o client
./client

✅ 5. Screenshots (All 15 Included)

📸 1. Client Login Screen

📸 2. Entering Username & Password

📸 3. Login Successful on Client

📸 4. Server Authenticating User

📸 5. Server Login Success Message

📸 6. Client Main Menu

📸 7. Uploading File – Progress Bar

📸 8. Upload Completed Successfully

📸 9. Downloading File – Progress Bar

📸 10. File List on Server

📸 11. Download Completed

📸 12. Server After File Transfer Logging

📸 13. Client Folder Showing Downloaded Files

📸 14. Server Folder Showing Uploaded Files

📸 15. GitHub Repository Overview

✅ 6. Learning Outcomes

You will understand:

1. Linux socket programming

2. TCP client–server communication

3. File transfer using streams

4. Chunk-based transmission

5. XOR encryption/decryption

6. Logging techniques

7. Git & GitHub workflow

8. WSL/Linux development environment

✅ 7. Future Enhancements

1. Multi-client support (threaded)

2. AES/RSA encryption instead of XOR

3. GUI interface

4. SHA-256 integrity verification

5. Pause/Resume downloads

✅ 8. Project Report File

📄 Download Project Report (PDF)

✅ 9. License

MIT License.

✅ 10. Author

Sandeep Pattanaik

CSE(Cyber Security) Student

ITER, S'O'A University