* Tighten up psf/black and flake8
* Fix some tests
* Fix some E741
* Fix some E741
* updating DIRECTORY.md
Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>
* Simplified DES
* Add files via upload
Diffie Hellman algorithm to generate a secret key.
* Update sdes.py
* Format code with psf/black and add doctests