1. Introduction
With rapid development of wireless network applications, security became one of the major problems that wireless networks face today. While firewalls may prove to be an efficient first line of defense in wired networks, that is certainly not the case in the wireless world. Wireless transmissions are subject to eavesdropping and signal jamming. Physical security of each node is important to maintain integral security of the entire network. Ad hoc wireless networks are totally dependent on collective participation of all nodes in routing of information through the network. These are some of the major problems that wireless networks face today. As the uses of such networks grow, users will demand secure yet efficient, low-latency communications.