Program to encrypt/decrypt file

[wildgenie7]

I want to show you my first fully finished Python program, I am interested in cybersecurity and I wanted to learn some programming language and work in this field. Currently in the hackthebox course.
It was difficult to understand the encryption methods and what depends on what, I also used materials on the Internet to finish it.

Link to my GitHub: https://github.com/WildGenie7/kar_encryptor1.0

Thanks for feedback!