This is a collection of utilities that can be used for illustrating or exploring some cryptographic concepts. Although it includes implementations of some cryptographic algorithms, these are not secure implementations.
See the documentation for use (or not) and reasons why this exists.
Note that if you need to do cryptography in Python, I recommend pyca or PyNaCl. If you want tools to explore the algebraic and number theoretic constructs used in cryptography, look at SageMath or SymPy.