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Wireless Network Security and Interworking

Two areas in which automation tools would be of great use to administrators of security policies are: reasoning about policies where the goal might be, for instance, detecting inconsistencies between a new security policy rule and an existing policy; and in finding network configurations which satisfy a set of policies. Security policies expressed in terms of firewall configuration are complicated and difficult to reason about, both for man and machine. Information that might aid this reasoning process such as the history of firewall configurations, the rationale and the intent of the administrator for past changes, is typically unrecorded. The ad- hoc fashion in which new rules are introduced into firewall configurations,. | 1 Wireless Network Security and Interworking Minho Shin Arunesh Mishra William A. Arbaugh Justin Ma mhshin arunesh waag@cs.umd.edu jtma@cs.ucsd.edu Abstract A variety of wireless technologies have been standardized and commercialized but no single technology is considered the best because of different coverage and bandwidth limitations. Thus interworking between heterogeneous wireless networks is extremely important for ubiquitous and high performance wireless communications. Security in interworking is a major challenge due to the vastly different security architectures used within each network. The goal of this article is two-fold. First we provide a comprehensive discussion of security problems and current technologies in 3G and WLAN systems. Second we provide introductory discussions about the security problems in interworking the state of the art solutions and open problems. Index Terms Wireless LAN Land mobile radio cellular systems Internetworking Communication system security Computer network security Data security I. Introduction Wireless communication technologies cover a whole spectrum from Wireless Personal Area Networks WPAN such as Bluetooth 1 to third generation cellular networks 3G such as CDMA2000 2 and UMTS 3 . Despite such variety opinions differ on which technology is optimal for satisfying all communication needs because of differing coverage and bandwidth limitations. For example 3G networks provide widespread coverage with limited bandwidth up to 2 Mbps . However Wireless Local Area Networks WLAN IEEE Std. 802.11 provide high bandwidth up to 54 Mbps with relatively smaller coverage area. For ubiquitous and high performance wireless networking services the interworking between wireless networks is extremely important. Most interworking studies have been dedicated to the integration of 3G and WLAN see 4 5 6 7 8 and 9 . Cellular and WLAN systems face distinct security challenges and each has addressed security in unique although not necessarily