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Data Encryption (Steganography + Password Protection)

A simple end-to-end project that hides (encrypts) text or files inside an image and allows you to decrypt/extract them using the correct password.
Backend is a Flask API (Python) and the frontend is a Flutter app.

Tech Stack

  • Backend: Python, Flask
  • Frontend: Flutter
  • Python deps: flask, pillow, cryptography, numpy

Setup & Run

Backend (Flask API)

  1. Navigate to the project directory.
  2. Install dependencies:
pip install flask pillow cryptography numpy
  1. Run the API server:
python API.py

Frontend (Flutter)

  1. Ensure you have the Flutter SDK installed.
  2. Install Flutter dependencies:
flutter pub get
  1. Launch the app on an emulator or physical device:
flutter run

Android Emulator Note

If you are running on an Android emulator, make sure the API endpoint in import_image_page.dart points to:

  • 10.0.2.2 (instead of localhost)

Usage

Select Action

On the Home Screen choose one of:

  • Import Text
  • Import File
  • Decrypt Image

Encrypt

  1. Enter your message or select a file.
  2. Provide a secure password.
  3. Choose a carrier image from your gallery.
  4. Click Convert to generate the protected (steganographic) image.

Decrypt

  1. Upload the steganographic image.
  2. Enter the correct password used during encryption.
  3. Retrieve the hidden message instantly.

License

This project is open-source and free to use for personal or educational purposes.