/steganography

Simple steganography algorithm

Primary LanguagePythonMIT LicenseMIT

Steganography

CI CodeQL

A simple steganography algorithm. This is project is really simple (and not inovative at all 😅) and is being developed for fun on my free time only, as of consequence is not intented to be complex or extensive.

"Steganography is the practice of concealing a message within another message or a physical object. In computing/electronic contexts, a computer file, message, image, or video is concealed within another file, message, image, or video. " - Wikipedia

This code will take any text and put it inside a image.

Disclaimer: It is NOT recommended using this if you intend to actually hide text inside an image as it's not really hard to decode the message.

Table of contents

  1. Steganography
  2. Table of contents
  3. Usage
  4. Contributing
  5. How it works

Usage

This project is currently being developed on Python 3.8.5 and Ubuntu 20.04.2 LTS, any other enviroment may not work properly.

Currently we can only run the stenography/main.py directly (But we have plans for a CLI). If you wish to run an example you should follow the steps below:

Install poetry:

https://python-poetry.org/docs/

Clone the repository and go inside it:

$ git clone https://github.com/JBizarri/steganography.git && cd steganography

Create a virtual environment:

$ python3 -m virtualenv venv

Activate the virtualenv

$ source venv/bin/activate

Install requirements with poetry:

$ poetry install --no-dev

Run:

$ python3 examples/encode_and_decode.py

You should see "Sample text" printed on your console.

Contributing

If you wish to contribute you can have a look at our CONTRIBUTING.md for a more detailed guideline.

Please run $ poetry install for the development dependencies and $ poetry run pre-commit install for the pre-commit hooks. This way tox will run everytime you try to make a commit and check for any linting, formatting and testing errors.

When making a Pull Request:

  • If you added new features you should also add tests for them.
  • Be sure every file is following our code conventions and all tests are fine by running tox. Otherwise we won't be able to merge your PR.
  • Update any documentation such as doctstrings, this README file and any other relevant file.

How it works

  1. Convert each letter from the secret message to ASCII code, the word "Dog" for example:

    • D: 68
    • o: 111
    • g: 103

  2. Convert each ASCII code to binary, following the last example we have:

    • 68:  01000100
    • 111: 01101111
    • 103: 01100111

  3. Repeat step 2 for the RGB values of a pixel (e.g rgb(255, 255, 255)).

  4. Change the least significant bit from the pixel to the first three values from step 2 (010, letter "D" from ASCII code 68). Then move to the next pixel and repeat the operation until the whole message has been written.

Steganography Process