A didactic example of public key (asymetric) cryptography for digital signature
clone this repo and install the dependencies using pip install -r requiremets.txt (using a virtualenv is strongly advised)
You may call each individual signature algorithm file (addition ,product) to get a quick demo on console
you can also call gui.py [algorithm] where algorithm may be either addition or product this will give you a gui you can use to play with the keys and messages