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\subsection{What can the attacker do after KPA?}  \label{sec:stealthy}  In this section, we briefly describe a stealthy attack on the CPS after the adversary has obtained the transfer function $\mG(z)$. The goal of this subsection is to demonstrate that KPA can enable other attacks discussed in the literature. For more detailed discuss on stealthy attack, please refer to~\cite{Pasqualetti2013}. to~\cite{Pasqualetti_2013}.  We assume that the adversary compromised a subset of actuators and sensors and can change the corresponding control inputs and sensor measurements respectively. As a result, the system equation becomes:  \begin{align*}