🔐 Encryption & Decryption Web App

A simple yet secure web application built using Flask and Fernet encryption from the cryptography library. Users can enter text to encrypt or decrypt messages in a clean and minimal UI. This project is ideal for anyone learning about web security and Python-based cryptography.

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🌐 Live Demo

👉 Click to Try the App Live

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🎥 Video Walkthrough

📹 Watch Loom Demo Walkthrough

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📝 Blog Post

📘 Read the Build Journey on My Blog

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⚙️ Tech Stack

• Python 3.x
• Flask
• Cryptography (Fernet)
• python-dotenv
• HTML/CSS (Jinja2)
• Render for deployment

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🚀 Getting Started

1. Clone the repository

git clone https://github.com/your-username/encryption-tool.git
cd encryption-tool

2. Create a virtual environment (optional but recommended)

python -m venv venv
source venv/bin/activate  # On Windows: venv\Scripts\activate

3. Install dependencies

pip install -r requirements.txt

4. Environment Setup

Create a .env file in your project root directory with the following content:

SECRET_KEY=your_fernet_generated_key_here
FLASK_SECRET_KEY=your_flask_secret_key_here

To generate keys:

Fernet key:

from cryptography.fernet import Fernet  
print(Fernet.generate_key().decode())

Flask-secret-key

python -c "import secrets; print(secrets.token_hex(32))"

5. How It Works

• Encryption: Enter plain text and click Encrypt.
• The text is encoded and encrypted using Fernet symmetric encryption.
• Decryption: Paste the encrypted text and click Decrypt. If valid, it shows the original message.

6. Project Structure

encryption-tool/

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├── templates/

│ └── index.html

├── .env

├── .gitignore

├── requirements.txt

├── simple_encryptor.py # Optional helper module

└── web_app.py # Main Flask app

7. Screenshots

8. Author

Name: Mugeha

LinkedIn: https://www.linkedin.com/in/mugeha-jackline

Email: mugehajacky@gmail.com

9. 📄 License

This project is licensed under the MIT License.