To develop a Java-based application that allows users to share files securely over a network by implementing encryption, authentication, and access control. The goal is to ensure that files are transferred safely, preventing unauthorized access or tampering.

???? Core Features:

1. User Authentication:

• Users must log in with a username and password
• Optionally implement role-based access (e.g., admin, user)

2. File Upload & Download:

• Users can upload files to the server and share with specific users
• Authorized users can download shared files

3. Encryption:

• Use cryptography to secure file content during transfer and storage
• Common techniques:
• AES (Advanced Encryption Standard) – for encrypting file data
• RSA – for key exchange or digital signatures
• Ensures files can only be read by intended recipients

4. Secure File Transfer:

• Use SSL/TLS protocols or custom socket programming with encryption
• Prevents interception or manipulation of files in transit

5. Logging & Auditing (Optional):

• Log file uploads, downloads, and access attempts for monitoring

????️ Technology Stack:

Backend:

1. Java (Core + Networking)
2. Java Sockets – for client-server communication
3. Java Cryptography Extension (JCE) – for implementing encryption/decryption
4. File I/O Streams – for reading and writing files

Frontend:

1. Java Swing or JavaFX – for building a graphical user interface (GUI)
2. GUI includes:
3. File upload/download buttons
4. Login screen
5. List of shared/received files

Database (Optional):

• MySQL / SQLite – to store user accounts, file metadata, and access logs

???? Security Mechanisms:

1. Password hashing (e.g., with SHA-256) before storing in DB
2. End-to-end encryption of file data
3. Digital signatures (optional) for integrity verification

✅ Project Outcome:

1. A functional desktop application where users can:
2. Share files securely
3. Authenticate and control access
4. Ensure files are encrypted and protected
5. Ideal for demonstrating:
6. Java networking and file handling
7. Basic cybersecurity practices
8. GUI development