Secure Data Encryption System Using Streamlit

Overview

This project is a Streamlit web application that allows users to register, log in, and securely store/retrieve data using Fernet encryption. It was developed as a class project for GIAIC on April 08, 2025.

Features

• User registration and login with username/password authentication (password strength enforced).
• Securely stores data using Fernet encryption with a user-provided passkey.
• Retrieves data by decrypting with the correct passkey.
• Limits users to 3 failed decryption attempts before requiring re-login.
• Persists data and user credentials in JSON files (data.json and users.json).
• Includes logout functionality and logging for debugging.
• User-friendly interface with loading spinners, input validation, and custom styling.

How to Use

1. Open the app at [insert Streamlit Cloud URL here].
2. Register: Create a username and password (at least 8 characters, 1 uppercase, 1 number).
3. Login: Log in with your credentials to access the system.
4. Navigate using the sidebar:
   • Store Data: Enter text and a passkey to encrypt and save your data.
   • Retrieve Data: Enter the encrypted data and passkey to decrypt and view your data.
   • Logout: Log out to end your session.
5. After 3 failed decryption attempts, you’ll be logged out and must log in again.

Security Features

• Uses Fernet (symmetric encryption) from the cryptography library.
• Hashes passkeys and passwords using SHA-256.
• Enforces password strength during registration.
• Limits failed attempts (both login and decryption) to 3 before requiring re-login.
• Stores data in-memory and persists it to JSON files (excluded from Git).
• Logs user actions and errors to app.log.

Limitations

• Single-user system; all data is stored in a shared dictionary (multi-user support could be added).
• Fernet key is stored in session state; in production, it should be stored securely (e.g., in an environment variable).
• No time-based lockout for failed attempts (could be added for production).

Setup for Local Development

1. Clone the repository:

   git clone https://github.com/your-username/your-repo.git
   cd Secure-data-encryption-system
   

2. Install dependencies:

   pip install -r requirements.txt
   
   

3. Run the app:

   streamlit run app.py