Well, X is a variable that's equal to 'X' :) It's a mix of cryptographic notation, Go/Python notations for slices, and my ad-hoc notation for AES-CBC. To be fai

Well, X is a variable that's equal to 'X' :) It's a mix of cryptographic notation, Go/Python notations for slices, and my ad-hoc notation for AES-CBC. To be fair, I find such pseudocode easier to read than math notation, but it's because I'm more used to it.