Security Enhancement of Sampled-Data Systems: Zero Assignment via Generalized Sampler

Kim, Daehan; Ryu, Kunhee; Back, Juhoon

doi:10.1016/j.ifacol.2020.12.1696

Cited by 2 publications

(2 citation statements)

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“…, which is a minimum phase system having relative degree 3. With T s = 0.1, its discrete-time equivalent model can be written as (10) with Fig. 4 The first plot is the state trajectory and the second is the outputs.…”

Section: Sampling-zero-dynamics Attackmentioning

confidence: 99%

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Zero-dynamics Attack, Variations, and Countermeasures

Shim

Back

Eun

et al. 2021

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This chapter presents an overview on actuator attacks that exploit zero dynamics, and countermeasures against them. First, zero-dynamics attack is reintroduced based on a canonical representation called normal form. Then it is shown that the target dynamic system is at elevated risk if the associated zero dynamics is unstable. From there on, several questions are raised in series to ensure when the target system is immune to the attack of this kind. The first question is: Is the target system secure from zero-dynamics attack if it does not have any unstable zeros? An answer provided for this question is: No, the target system may still be at risk due to another attack surface emerging in the process of implementation. This is followed by a series of next questions, and in the course of providing answers, variants of the classic zero-dynamics attack are presented, from which the vulnerability of the target system is explored in depth. At the end, countermeasures are proposed to render the attack ineffective. Because it is known that the zero-dynamics in continuoustime systems cannot be modified by feedback, the main idea of the countermeasure is to relocate any unstable zero to a stable region in the stage of digital implementation through modified digital samplers and holders. Adversaries can still attack actuators, but due to the re-located zeros, they are of little use in damaging the target system.

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Section: Sampling-zero-dynamics Attackmentioning

confidence: 99%

“…Along with the approach of using GH, the use of GS disarms the zero-dynamics attack. This subsection is based on the work of [10].…”

Section: Moving Zeros By Generalized Samplermentioning

confidence: 99%