I changed the plan. Now, I want to build a better password entry for sudo… with chess. Every cell on the chess board stands for two ascii characters, depending on the color of the piece on it, it returns a ascii string. So your sudo password is transformed into a chess position and every time when you legitimate as sudo, you enter the position that gives the password to stdout. I think about the gui, should I use tkinter or an alternative (kivy, etc.) ?