Aerospace and Electronic Systems Magazine November 2017 - 53

tem, which can lead to a Denial-of-Service (DoS) condition [7]. It
can also show numerous ghost aircraft on a cockpit display, forcing
pilots to change their course and/or velocity. Attackers can also delete messages by transmitting jamming signals, which causes aircraft disappearance, or modify messages by transmitting conflicting ADS-B messages against legitimate ADS-B messages. ADS-B
requires two message frames to decode the location (even and odd
frames) and by transmitting a fake message for each legitimate
message, the decoding process can be easily fooled. By combining
these attacks, attackers can cripple the ATC operation and bring a
great danger to air transportation.

WHY IS THE ADS-B SECURITY IMPORTANT?
Accurate location data through ADS-B enables a more efficient
use of the airspace for aircraft separation and directional guidance,

and allows ATC to accommodate more traffic. If the location data
is untrustworthy, the ATC capability will be significantly reduced.
Unfortunately, the aforementioned attacks significantly degrade
the effectiveness of the NextGen ATC system. Currently, the aircraft locations are tracked by primary and secondary surveillance
radar. But once NextGen is fully deployed, the system will rely on
the ADS-B, so the trustworthiness of the ADS-B data is critical to
air traffic safety.
Moreover, there is a trend to integrate the ACAS and ADS-B
data. ACAS allows airplanes to avoid collision by probing each
other and measure the probe-response time delay [9], [10], but it
has some limitations, i.e., short distance, low accuracy, slow update rate, and high cost. ADS-B, on the other hand, offers higher
accuracy, finer grain aircraft separation, longer range, lower cost,
and ubiquity from 2020, which will lead to higher dependence on
the ADS-B.

Figure 1.

ADS-B operation.

NOVEMBER 2017

IEEE A&E SYSTEMS MAGAZINE

53



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