We live in a world of secret passages. We need keys, and perhaps more than one, to get behind locked doors. We need photo ID's to get past security guards. We need passwords to access computer files. We need PIN numbers to get money out of our own bank account or to charge groceries on our bankcards. Some buildings are so sophisticated that you have to use your handprint to get clearance to enter into secured rooms.

Just try to get past security without the right password and the computer screen will begin flashing the words: "Access Denied." No matter where we go today, whether it's online or on board a 747 airliner, we have to have the right information to gain access. If we don't know the secret password, or we don't have the proper identification as a cleared, non-risk person, we will…