Unlike sensor
networks, WLANs have an access point that can enforce a uniform security
policy across all wireless clients that communicate through the access point.
2.1 Wireless Security Approaches
WiMetrics [15] is a commercially available monitoring and intrusion protection
system. It implements an identity profiling process that can preauthorize
a user through a registration process or authorize on the fly by probing the
wireless device to derive an identity profile based on the response. Probing
wireless stations is intrusive and as the number of clients increases, the already
constrained network becomes burdened with additional tra?±c imposed
by the system. This approach has other drawbacks including the administrative
overhead of the preauthorization process. In addition, a hacker could
elude the system by crafting responses to the probe request to impersonate
the identity of a legitimate user, reducing the e?®ectiveness of this scheme. This
method of establishing an identity profile is not applicable to sensor networks,
particularly for dense sensor networks. The probing process burdens the constrained
network with additional tra?±c and consumes valuable battery life at
the sensor node. With nodes entering and exiting the network dynamically,
the profiling process has to be repeated, further consuming limited resources.
IPass Inc. developed DeviceID [14] , a software-based authentication technology.
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