The entropy Randall calculated for "correcthorsestaplebattery" was a lower bound, meaning that if the attacker knows that you made your password out of 4 dictio

The entropy Randall calculated for "correcthorsestaplebattery" was a lower bound, meaning that if the attacker knows that you made your password out of 4 dictionary words, it still has tons of entropy. If the attacker doesn't know how you came up with your password, it'll take them even longer.