Password Strength & Breach Checker

A simple Flask web app that checks how strong a password is and whether it has appeared in known data breaches using the Have I Been Pwned API. Built as a cybersecurity learning project.

Features

• Checks password strength based on:

  • Minimum 8 characters

  • Use of uppercase, lowercase, digits, and symbols

• Verifies passwords against the Have I Been Pwned API

• Shows color-coded results (weak, medium, strong)

• Clean web interface

• Safe: passwords are hashed locally before being checked

Tech Stack

• Python 3

• Flask (backend)

• Requests (API calls)

• HTML + CSS (frontend)

Installation & Usage

1. Clone the repository: git clone https://github.com/yourusername/password-checker.git cd password-checker

2. Create and activate a virtual environment: python3 -m venv venv source venv/bin/activate (Linux/Mac) venv\Scripts\activate (Windows)

3. Install dependencies: pip install -r requirements.txt

4. Run the app: python app.py

5. Open your browser and go to: http://127.0.0.1:5000/

Preview

Main Page

Result Page

File Structure

password_checker/

• app.py
• requirements.txt
• templates/
  • index.html
  • result.html
• venv/

Future Improvements

• Real-time strength meter (JavaScript)

• Track usage stats

• Add light/dark theme switch

Author

kornix Cybersecurity & Python Developer GitHub: https://github.com/kornix-dev

Disclaimer: This project is for educational purposes only. Do not use real passwords for testing