Every weekday at 3 p.m. the Federal Express driver stops at the loading dock of a building where the offices of Medical associates, Inc. are located. When the driver backs the truck up to the rear door of the building, he presses the buzzer and lets the security guard know he is at the door. Because the building’s security personnel recognize the driver as he comes to the door every day around the same time for pickup and drop-off—they remotely unlock the door and allow the driver to enter. A hacker is watching this process from a car in the parking lot and takes note of the procedure to gain physical entry into the building.The next day, the hacker carries a large cardboard box toward the door just as the Federal Express driver has been given entry to the building.