No no no - haven't you been paying attention? The whole point of the system design is that is doesn't matter if the terrorists know the code for emergency door opening, because that code gives a 1-2 min delay efore opening, all the time with a godawful alarm sounding in the FD, so pilots have plenty of time to assess the situation and, if necessary, completely disable the external keypad/entry system. If both pilots are so unconscious they don't deny entry to any bad guys using the not-so-secret code then you have problems anyway.