@hyperreality said:
Nice challenge, I didn’t really understand why the other menu options are there though. If you are stuck it’s definitely worth thinking about the title of the challenge and how it might relate to the cryptosystem being presented!
That was the idea! 
glad you liked it haha
@nemen said:
Beautiful challenge. It took me a long time to study and taught me a few things about cryptography. Thanks @Xh4h
Awesome!! 