LCN '04 Proceedings of the 29th Annual IEEE International Conference on Local Computer Networks
WLAN location determination without active client collaboration
Proceedings of the 6th International Wireless Communications and Mobile Computing Conference
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This paper presents the results obtained in the development of a security mechanism for internet access control, based on the physical location of wireless stations. To achieve such a mechanism a wireless location system was develop, so that the network infrastructure can dynamically reconfigure proxy/firewall rules. To locate the wireless stations with the precision needed in this system, two techniques was used: amplitude fingerprint and amplitude triangulation. We also build a dynamic obstacle attenuation identifier due the fact that this obstacles can interfer in the location process. The dynamic obstacles attenuation was incorporate in the location technique to achieve a better precision in this process. After identifying the wireless station, the security system can apply the security policy defined to a specific physical area. In order to validate the system, we used a academic environment with classroom based security rules. In this environment, each classroom is defined by a specific subnet and the security rules are defined by the teacher based on the class educational objectives. The wireless network is defined in a unique subnet, differing from all the classroom networks. The system goal is to apply the class-based security restrictions to all the devices physically located in the specific classroom, been either wired or wireless stations.