The rapid proliferation of wireless networks and mobile computing applications has changed the landscape of network security. The recent denial of service attacks on major Internet sites have shown us, no open computer network is immune from intrusions. The wireless ad-hoc network is particularly vulnerable due to its features of open medium, dynamic changing topology, cooperative algorithms, lack of centralized monitoring and management point, and lack of a clear line of defense. The

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... l way of protecting networks with firewalls and encryption software is no longer sufficient and effective. The IDS engine is the control unit of the intrusion detection system. Its main purpose is to manage the system, i.e., supervise all operations of the intrusion detection system. Its duty depends on the intrusion detection method used. Wireless has opened a new and exciting world for many of us. Its technology is advancing and changing every day and its popularity is increasing. The biggest concern with wireless, however, has been security. The traditional wired IDS is a great system, but unfortunately it does little for the wireless world. Implementing WIDS systems is definitely a step in the right direction. If you have wireless and are concerned about attacks and intruders, a WIDS may be a great idea.