TY - GEN
T1 - Enhancement of security against zero dynamics attack via generalized hold
AU - Back, Juhoon
AU - Kim, Jihan
AU - Lee, Chanhwa
AU - Park, Gyunghoon
AU - Shim, Hyungbo
N1 - Publisher Copyright:
© 2017 IEEE.
PY - 2017/6/28
Y1 - 2017/6/28
N2 - Zero dynamics attack is lethal to cyber-physical systems in the sense that it is stealthy and there is no way to detect it. Fortunately, if the given continuous-time physical system is of minimum phase, the effect of the attack is negligible even if it is not detected. However, the situation becomes unfavorable again if one uses digital control by sampling the sensor measurement and using the zero-order-hold for actuation because of the 'sampling zeros.' When the continuous-time system has relative degree greater than two and the sampling period is small, the sampled-data system must have unstable zeros (even if the continuous-time system is of minimum phase), so that the cyber-physical system becomes vulnerable to 'sampling zero dynamics attack.' In this paper, we begin with its demonstration by a few examples. Then, we present an idea to protect the system by allocating those discrete-time zeros into stable ones. This idea is realized by employing the so-called 'generalized hold' which replaces the zero-order-hold.
AB - Zero dynamics attack is lethal to cyber-physical systems in the sense that it is stealthy and there is no way to detect it. Fortunately, if the given continuous-time physical system is of minimum phase, the effect of the attack is negligible even if it is not detected. However, the situation becomes unfavorable again if one uses digital control by sampling the sensor measurement and using the zero-order-hold for actuation because of the 'sampling zeros.' When the continuous-time system has relative degree greater than two and the sampling period is small, the sampled-data system must have unstable zeros (even if the continuous-time system is of minimum phase), so that the cyber-physical system becomes vulnerable to 'sampling zero dynamics attack.' In this paper, we begin with its demonstration by a few examples. Then, we present an idea to protect the system by allocating those discrete-time zeros into stable ones. This idea is realized by employing the so-called 'generalized hold' which replaces the zero-order-hold.
KW - J. Back is with the School of Robotics
KW - Korea
KW - Kwangwoon University
KW - Seoul
UR - http://www.scopus.com/inward/record.url?scp=85046148056&partnerID=8YFLogxK
U2 - 10.1109/CDC.2017.8263842
DO - 10.1109/CDC.2017.8263842
M3 - Conference contribution
AN - SCOPUS:85046148056
T3 - 2017 IEEE 56th Annual Conference on Decision and Control, CDC 2017
SP - 1350
EP - 1355
BT - 2017 IEEE 56th Annual Conference on Decision and Control, CDC 2017
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 56th IEEE Annual Conference on Decision and Control, CDC 2017
Y2 - 12 December 2017 through 15 December 2017
ER -