1 research outputs found
Application of the unified control and detection framework to detecting stealthy integrity cyber-attacks on feedback control systems
This draft addresses issues of detecting stealthy integrity cyber-attacks on
automatic control systems in the unified control and detection framework. A
general form of integrity cyber-attacks that cannot be detected using the
well-established observer-based technique is first introduced as kernel
attacks. The well-known replay, zero dynamics and covert attacks are special
forms of the kernel attacks. Existence conditions for the kernel attacks are
presented. It is demonstrated, in the unified framework of control and
detection, that all kernel attacks can be structurally detected when not only
the observer-based residual, but also the control signal based residual signals
are generated and used for the detection purpose. Based on the analytical
results, two schemes for detecting the kernel attacks are then proposed, which
allow reliable attack detection without loss of control performance. While the
first scheme is similar to the well-established moving target method and
auxiliary system aided detection scheme, the second detector is realised with
encrypted transmissions of control and monitoring signals in the feedback
control system that prevents adversary to gain system knowledge by means of
eavesdropping attacks. Both schemes are illustrated by examples of detecting
replay, zero dynamics and covert attacks and an experimental study on a
three-tank control system