🧮 Math-Based CAPTCHA

A simple but powerful math-based CAPTCHA system built with Python, Flask, and Pillow.
It helps prevent bots by asking users to solve a basic math problem before verification.

👉 Live Demo: Math CAPTCHA on PythonAnywhere

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✨ Features

• 🔢 Random math problems using +, -, and *
• 🖼️ Captcha images dynamically generated with Pillow (captcha.ttf font)
• ⚡ Clean & responsive Flask web UI with inline HTML/CSS
• ✅ Session-based verification with 10-minute expiry
• 🔁 Redirects verified users to another page (currently The India Ledger)
• 🖥️ Works both as:
  • Standalone script (generates PNG locally)
  • Flask web app (interactive UI + validation)

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🛠️ Tech Stack

• Python 3.x
• Flask – Web framework
• Pillow (PIL) – Image generation
• HTML + CSS – Styled interface
• Docker (optional, for containerized deployment)

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📸 Screenshots

Script Version (Generated PNG):

Web App (Flask UI):

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🚀 Getting Started

1️⃣ Clone the repo

git clone https://github.com/Aditya-jaiswal07972/Math-Based-Captcha.git
cd Math-Based-Captcha

2️⃣ Install dependencies

pip install -r requirements.txt

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▶️ Run as a simple script

Generates a static out.png captcha image.

python python-captha.py

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🌐 Run as a Flask web app

Serves an interactive math CAPTCHA in your browser.

pip install flask pillow
python app.py

Then visit: 👉 http://127.0.0.1:5000/

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🐳 Run with Docker (optional)

docker build -t math-captcha .
docker run -p 5000:5000 math-captcha

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⚙️ Configuration

• SECRET_KEY → should be set as an environment variable in production
• EXPIRY_SECONDS → default 600 (10 minutes), controls verification validity
• captcha.ttf → custom font for rendering; falls back to default if missing

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📜 License

This project is licensed under the MIT License. © 2025 Aadi (Aditya Jaiswal)

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