Secure Detection in Cyberphysical Control Systems

مرکز و کتابخانه مطالعات اسلامی به زبان های اروپایی

منو

" Secure Detection in Cyberphysical Control Systems "
Rohan Chabukswar Sinopoli, Bruno

Document Type	:	Latin Dissertation
Language of Document	:	English
Record Number	:	803302
Doc. No	:	TL48086
Call number	:	‭1651182435;‮ ‬3648800‬
Main Entry	:	Makhadmeh, Naheda
Title & Author	:	Secure Detection in Cyberphysical Control Systems\ Rohan ChabukswarSinopoli, Bruno
College	:	Carnegie Mellon University
Date	:	2014
Degree	:	Ph.D.
field of study	:	Electrical and Computer Engineering
student score	:	2014
Page No	:	152
Note	:	Committee members: Grover, Pulkit; Rowe, Anthony; Sandberg, Henrik
Note	:	Place of publication: United States, Ann Arbor; ISBN=978-1-321-50259-6
Abstract	:	A SCADA system employing the distributed networks of sensors and actuators that interact with the physical environment is vulnerable to attacks that target the interface between the cyber and physical subsystems. An attack that hijacks the sensors in an attempt to provide false readings to the controller (for example, the Stuxnet worm that targeted Iran’s nuclear centrifuges) can be used to feign normal system operation for the control system, while the attacker can hijack the actuators to send the system beyond its safety range. This thesis extends the results of a previously proposed method. The original method proposed addition of a randomized “watermarking” signal and checking for the presence of this signal and its effects in the received sensor measurements. Since the control inputs traverse the cyberphysical boundary and make their effects apparent in the sensor measurements, they are employed to carry this watermarking signal through to the system and back to the SCADA controller. The sensor measurements are compared to the expected measurements (calculated using a suitably delayed model of the system within the controller). This methodology is based on using the statistics of the linear system and its controller. The inclusion of a randomized signal on the control inputs induces an increase in the performance cost of the physical system. This thesis proposes a method of optimization of the watermarking signal based on the trade-off between this performance cost and the attack detection rate, by leveraging the distribution the watermarking signal over multiple inputs and multiple outputs. It is further proved that regardless of the number of inputs and outputs in the system, only one watermarking signal needs to be generated. This optimization, and its necessity in improving the effectiveness of the detector without detriment to the performance cost, are demonstrated on a simulated chemical plant. The thesis also proposes another methodology that does not rely on these statistics, but is instead based on calculating the correlation between the received sensor measurements and the expected measurements accrued from the model inside the controller.
Subject	:	Computer Engineering; Electrical engineering
Descriptor	:	Applied sciences;Control inputs;Cyberphysical systems;Secure control;Watermarking signal
Added Entry	:	Sinopoli, Bruno
Added Entry	:	Electrical and Computer EngineeringCarnegie Mellon University