Creating a Simple Flask Web App

Flask is a micro-web framework for Python that allows you to quickly create web applications. In this tutorial, we will guide you through creating a simple Flask web app that demonstrates basic encryption techniques.

Step 1: Install Flask

To get started, you’ll need to install Flask. You can do this by running the following command in your terminal:

pip install Flask

Step 2: Create the Flask App

Next, create a new file called app.py and add the following code:

from flask import Flask

app = Flask(__name__)

@app.route('/')
def home():
    return 'Welcome to our Flask Web App!'

if __name__ == '__main__':
    app.run()
    

Step 3: Run the Flask App

Now that you’ve created the Flask app, you can run it by executing the following command in your terminal:

python app.py

You should see a message indicating that the Flask app is running. You can then open a web browser and navigate to http://localhost:5000 to see your web app in action.

Step 4: Implement Encryption

To demonstrate basic encryption techniques in your Flask web app, you can use Python’s cryptography library. Add the following code to your app.py file:

from cryptography.fernet import Fernet

key = Fernet.generate_key()
cipher_suite = Fernet(key)

@app.route('/encrypt/')
def encrypt_message(message):
    encrypted_message = cipher_suite.encrypt(message.encode())
    return encrypted_message

@app.route('/decrypt/')
def decrypt_message(encrypted_message):
    decrypted_message = cipher_suite.decrypt(encrypted_message.encode())
    return decrypted_message.decode()
    

Now you can visit URLs like http://localhost:5000/encrypt/HelloWorld and http://localhost:5000/decrypt/encrypted_message_here to see encryption and decryption in action.

Conclusion

Congratulations! You have successfully created a simple Flask web app that demonstrates basic encryption techniques. Feel free to explore more Flask features and add more functionality to your web app.