Intro to Cryptography

Hey! So, recently I've developed an interest for cryptography and cryptanalysis. Thanks to the school of computing at the University of Kent and my extended research, I've learnt a lot about cryptography such as how to break ciphers and some essential techniques for secure communications.

I have seen many online tools out there that help with cryptanalysis, for example, to break Vigener ciphers, or substitution ciphers. However, I have not seen or come across an open source code that shows how things like frequency analysis, calculating index of coincidences and so forth, are done. So, I decided to make one available to help other students and learners learn quicker, and see how tools like that are implemented, and here it is:

I have also written a small tool for Columnar Transposition cipher, because I haven't found a good open source example without a bug or dirty code, also here it is:

I will soon be writing a tool that demonstrates how to break Columnar Transposition ciphers using Bigrams. I hope this will reach the right people, and help whoever wants to start learning cryptography.

Thank you :)