Propagation modeling of wireless networks for interceptibility assessment

Summary form only given. Many organizations are choosing wireless local area networks (WLANs) and point-to-point (PTP) systems over hardwired networks because of their convenience and flexibility. One concern in deploying such systems is the possibility of the signal being intercepted by unauthorized users. Predicting, and subsequently controlling, the electromagnetic radiation can be an effective means of securing the network. The paper examines the propagation of WLAN and PTP systems and their vulnerability to interception. Some simple steps that can be taken to improve security are provided. The findings indicate that there are numerous vulnerabilities associated with wireless systems that may not be apparent through examination of the physical layout of buildings. The simulation results show that sporadic hotspots may appear due "corner reflectors" comprised of a building\´s corners and the floor. Some precautions are suggested to reduce the chances of interception, including adjustment of antenna locations, tinting windows, and exercising physical security measures at hotspots.