A pure Python Steganography module.
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.
$ pipenv 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 pipenv.
- it is now possible to either pass the location of an image or directly pass an already opened Image.Image to the hide and reveal methods;
- code re-formatted a bit with black.
- updated Pillow dependency to version 6.0.0 in order to fix a bug when opening some PNG files (https://github.com/python-pillow/Pillow/issues/3557).
- updated Pillow dependency in order to fix a bug when opening some PNG files.
- added the possibility to shift the encoded bits when using the lsbset module.
- fixed a potential security issue related to CVE-2018-18074.
- Fixed an encoding problem which occured on Windows during the installation of the module.
- Stegano is ready for use with pipenv and pipsi.
- the recommended way to install Stegano is now to use pipenv.
- Fixed a bug with the new ‘encoding’ function when using Stegano as a command line tool. No default value was set. Default value is UTF-8.
- it is now possible to specify the encoding (UTF-8 or UTF-32LE) of the message to hide/reveal through the command line;
- the help of the command line now displays the available choices for the arguments, if it is necessary (list of available encodings, list of available generators);
- tests expected results lies now in a dedicated folder;
- a script has been added in order to get proper exit code check for mypy.
- updated command line. All commands are now prefixed with stegano-;
- improved type hints;
- it is possible to load and save images from and to file objects (BytesIO);
- improved checks when revealing a message with the lsbset module fails.
- improved generators for the lsb-set module;
- improved tests for the generators;
- improved type hints.
- unicode is now supported. By default UTF-8 encoding is used. UTF-32LE can also be used to hide non-ASCII characters. UTF-8 (8 bits) is the default choice since it is possible to hide longer messages with it.
- improved checks with type hints.
- introduces some type hints (PEP 484);
- more tests for the generators and for the tools module;
- updated descriptions of generators;
- fixed a bug with a generator that has been previously renamed.
- bugfix: fixed #12: Error when revealing a hidden binary file in an image.
- bugfix: added missing dependency in the setup.py file.
- improved docstrings for the desciption of the generators;
- improved the command which displays the list of generators.
- added a command to list all available generators for the lsb-set module;
- test when the data image is coming via byte stream, for the lsb module.
- a command line for the ‘red’ module has been added;
- bugfix: fixed a bug in the lsb-set command line when the generator wasn’t specified by the user.
- Support for transparent PNG images has been added (lsb and lsbset modules).
- bugfix: solved a bug when the image data is coming via byte streams (ByteIO), for the exifHeader hiding method.
- reorganization of the steganalysis sub-module.
- improvements of the command line of Stéganô. The use of Stéganô through the command line has slightly changed (‘hide’ and ‘reveal’ are now sub-parameters of the command line). No changes if you use Stéganô as a module in your software. The documentation has been updated accordingly.
- bugfix: Incorrect padding size in base642string in tools.base642binary().
- the generator provided to the functions lsbset.hide() and lsbset.reveal() is now a function. This is more convenient for a user who wants to use a custom generator (not in the module lsbset.generators).
- performance improvements for the lsb and lsbset modules.
- reorganization of all modules. No impact for the users of Stegano.
- improvements and bug fixes for the exifHeader module;
- added unit tests for the exifHeader module;
- improvements of the documentation.
- minor improvements and bug fixes;
- added unit tests for the slsb and slsbset modules.
- management of greyscale images.
- bugfix when the length of the message to hide is not divisible by 3, for the slsb and slsbset module.
- new project home page;
- minor updated to the documentation.
- bug fixes for Python 3;
- bug fixes in the scripts in ./bin.
- first stable release on PypI.
This release introduces a more advanced LSB (Least Significant Bit) method based on integers sets. The sets generated with Python generators (Sieve of Eratosthenes, Fermat, Carmichael numbers, etc.) are used to select the pixels used to hide the information. You can use these new methods in your Python codes as a Python module or as a program in your scripts.
- you can now use Stéganô as a library in your Python program; (python setup.py install) or as a ‘program’ thanks to the scripts provided in the bin directory;
- new documentation (reStructuredText) comes with Stéganô.
- this release introduces some bugfixes and a major speed improvement of the reveal function for the LSB method. Moreover it is now possible to hide a binary file (ogg, executable, etc.);
- a new technique for hiding/revealing a message in a JPEG picture by using the description field of the image is provided.
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