In fact, even if the attacker: 1) Knows this scheme was used. 2) Knows the list of words you used. 3) Knows how many words you used. You will still have tha

In fact, even if the attacker: 1) Knows this scheme was used. 2) Knows the list of words you used. 3) Knows how many words you used. You will still have that amount of entropy. Diceware entropy values are calculated with all three of these assumptions already made.