IEEE Consumer Electronics Magazine - March/April 2020 - 36
Consumer Electronics Security
Figure 1. Device spoofing detection using the
network characteristics of the user device.
well-accepted security standard, such as WPA
pre-shared key, was used.
DEVICE SPOOFING DETECTION WITH
NETWORK CHARACTERISTICS
The main idea is to monitor the physical network characteristics of a device, checking for
any significant change in the network characteristics to detect messages delivered from spoofed
devices. Our intuition is that the physical network characteristics of a device (e.g., RSSI) can
change significantly depending on the physical
device location, and be an effective feature for
fingerprinting devices. Figure 1 shows how an
attacker's spoofed device can be detected with
our method. "Verifier" refers to a device that
continuously monitors the changes (checking
for anomalies) in the physical network characteristics of user devices. We imagine that APs
could play the role of a verifier.
As one would imagine, a single network
packet and its measurements are not sufficient
to provide a reliable device fingerprint information. Therefore, we suggest using k network
packets in a time window (see Figure 2). If the
network characteristics of a device do not
change significantly, packets in a time window Ti
and packets in the next time window Tiþ1 are
likely to show similar trends. Consequently, if
the network characteristics of packets collected
from a device during two time windows are significantly different and the device owner has not
altered the geographical location of that device,
there is some chance that a spoofing attack is
being performed.
However, there are many technical challenges with this kind of approach that need to
be addressed. For instance, one would have
to investigate and analyze different network
characteristics features that would be effective.
36
Figure 2. Network packets collected in two time
windows.
One would have to optimize parameters like the
window sizes and threshold values, and design
algorithms to compare packets from two subsequent time intervals. The next sections discuss
how we addressed those challenges through different experiments.
If the similarity score between packets in a
time window Ti and packets in the next time window Tiþ1 is greater than a given threshold a, it
can be classified as a suspicious (anomalous)
device.
To implement this logic, we need to compute
similarity scores between packets in consecutive
time windows. We considered the following two
popular time series algorithms: first, Euclidean
distance, and second, dynamic time warping
(DTW) distance (see the details in the work done
by Yu et al.9).
CASE STUDY
To demonstrate the feasibility, we evaluate
the performance of the proposed method on
ZigBee networks, which are popularly used in
Internet of Things applications. However, our
technique can be generalized, and be applied to
other wireless networking environments such as
WiFi and Bluetooth.
For ZigBee, we consider the following three
features that can be used for device fingerprinting. RSSI indicates the signal strength level of a
received radio signal. The higher the RSSI value,
the stronger the received signal. Round trip time
(RTT) is the sum of propagation delays of a
request packet and its response packet. RTT is
generally affected by the geographical distance
between two network parties involved in a communication. Link quality indicator (LQI) is a metric used to estimate the link quality of a received
signal. It represents how easily a received signal
can be demodulated by accumulating the magnitude of the error between ideal constellations
and the received signal.
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