Stegano, a pure Python Steganography module.
Steganography is the art and science of writing hidden messages in such a way that no one, apart from the sender and intended recipient, suspects the existence of the message, a form of security through obscurity. Consequently, functions provided by Stegano only hide messages, without encryption. Steganography is often used with cryptography.
For reporting issues, visit the tracker here: https://todo.sr.ht/~cedric/stegano
$ poetry install stegano
You will be able to use Stegano in your Python programs.
If you only want to install Stegano as a command line tool:
$ pipx install stegano
pipx installs scripts (system wide available) provided by Python packages into separate virtualenvs to shield them from your system and each other.
A tutorial is available.
Use Stegano as a library in your Python program
If you want to use Stegano in your Python program you just have to import the appropriate steganography technique. For example:
>>> from stegano import lsb >>> secret = lsb.hide("./tests/sample-files/Lenna.png", "Hello World") >>> secret.save("./Lenna-secret.png") >>> >>> clear_message = lsb.reveal("./Lenna-secret.png")
Use Stegano as a command line tool
Hide and reveal a message
$ stegano-lsb hide -i ./tests/sample-files/Lenna.png -m "Secret Message" -o Lena1.png $ stegano-lsb reveal -i Lena1.png Secret Message
Hide the message with the Sieve of Eratosthenes
$ stegano-lsb-set hide -i ./tests/sample-files/Lenna.png -m 'Secret Message' --generator eratosthenes -o Lena2.png
The message will be scattered in the picture, following a set described by the Sieve of Eratosthenes. Other sets are available. You can also use your own generators.
This will make a steganalysis more complicated.
Running the tests
$ python -m unittest discover -v
Running the static type checker:
$ python tools/run_mypy.py
Contributions are welcome. If you want to contribute to Stegano I highly recommend you to install it in a Python virtual environment with poetry.
This software is licensed under GNU General Public License version 3
Copyright (C) 2010-2019 Cédric Bonhomme
For more information, the list of authors and contributors is available.