This talk looks at linear systems under attack from an adversary. Such cyber attacks cause malfunctioning and damage and there is an increasing need for automated responses as part of the resilience of the system. I will explore several fundamental ideas around linear systems under attack, such as the notion of "system security index" as an analogon to the notion of "minimum distance" in error control coding. Perpetuating this coding theorist approach I will make a link with the behavioral system theory approach and show how this combination of approaches can be used for the purpose of attack detection and automated attack correction.
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