Earlier quoted context omitted.
You don't need to attack the math, if you can attack the sender or thr receiver ['s hardware].
Good luck If I burnt the one time pad.
No, there's a misunderstanding.
You can extract the message the user entered/received BEFORE/AFTER the en-/decryption. eg. a keylogger, a screencapture, extracting memory from the processes, just recording the screen from behind the user, ...