judyb 0.0.3

A pure Python judyb module.

# judyb

[](https://builds.sr.ht/~cedric/judyb)

[judyb](https://sr.ht/~cedric/judyb), a pure Python judyb module.

judyb 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 judyb only hide messages, without encryption. judybgraphy is often used with cryptography.

For reporting issues, visit the tracker here: https://todo.sr.ht/~cedric/judyb

## Installation

`bash $ poetry install judyb `

You will be able to use judyb in your Python programs.

If you only want to install judyb as a command line tool:

`bash $ pipx install judyb `

pipx installs scripts (system wide available) provided by Python packages into separate virtualenvs to shield them from your system and each other.

## Usage

A [tutorial](https://judyb.readthedocs.io) is available.

## Use judyb as a library in your Python program

If you want to use judyb in your Python program you just have to import the appropriate judybgraphy technique. For example:

`python >>> from judyb 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 judyb as a command line tool

### Hide and reveal a message

`bash $ judyb-lsb hide -i ./tests/sample-files/Lenna.png -m "Secret Message" -o Lena1.png $ judyb-lsb reveal -i Lena1.png Secret Message `

### Hide the message with the Sieve of Eratosthenes

`bash $ judyb-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

`bash $ python -m unittest discover -v `

Running the static type checker:

`bash $ mypy judyb `

## Contributions

Contributions are welcome. If you want to contribute to judyb I highly recommend you to install it in a Python virtual environment with poetry.

## License

This software is licensed under [GNU General Public License version 3](https://www.gnu.org/licenses/gpl-3.0.html)

Copyright (C) 2010-2022 [Cédric Bonhomme](https://www.cedricbonhomme.org)

For more information, [the list of authors and contributors](CONTRIBUTORS.md) is available.