🔐 Secure File Sharing System

📌 Project Overview

This project is a secure cloud-based file sharing system developed using Java. It ensures confidentiality, integrity, and access control of files using advanced security techniques.

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🚀 Features

• 🔒 AES Encryption (Client-side encryption)
• 🔑 OTP-based Authentication (Two-factor authentication)
• 🛡 SHA-256 Integrity Verification
• ☁ Secure Cloud Storage (Encrypted files only)
• 👁 Zero-Knowledge Security Model
• 📜 Audit Logging (User activities tracking)

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🏗 Technologies Used

• Java (Servlets & JSP)
• Apache Tomcat Server
• HTML, CSS
• MySQL Database

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🔄 System Workflow

1. User Login with credentials + OTP
2. File is encrypted using AES before upload
3. SHA-256 hash is generated for integrity
4. Encrypted file is stored in cloud
5. During download:
   • File is decrypted
   • Integrity is verified using hash

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🔐 Security Mechanisms

• AES Symmetric Encryption
• SHA-256 Hashing
• OTP Authentication
• Access Control
• Audit Logs

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▶ How to Run

1. Install Apache Tomcat
2. Import project into IDE (Eclipse/IntelliJ)
3. Configure database (MySQL)
4. Deploy project on server
5. Run on browser: http://localhost:8080/

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👩‍💻 Author

Durga