Secure SCADA Protocol for the 21st century (SSP21) is a cryptographic wrapper for ICS environments. It is inspired by the Noise Protocol.
The specification is built using pandoc. The included Makefile will generate PDF and HTML output.
> sudo apt-get install pandoc mscgen graphviz texlive texlive-latex-base texlive-latex-extra texlive-fonts-recommended lmodern python-dev python-pip inkscape
> pip install pandoc-fignos
Depending on your setup of Python, you may need to add ~/.local/bin to your path.