This paper studies the impact of side initial state information on thedetectability of data deception attacks against cyber-physical systems. Weassume the attack detector has access to a linear function of the initialsystem state that cannot be altered by an attacker. First, we provide anecessary and sufficient condition for an attack to be undetectable by anydynamic attack detector under each specific side information pattern. Second,we characterize attacks that can be sustained for arbitrarily long periodswithout being detected. Third, we define the zero state inducing attack, theonly type of attack that remains dynamically undetectable regardless of theside initial state information available to the attack detector. Finally, wedesign a dynamic attack detector that detects detectable attacks.
展开▼
