Physical attacks have been subject of extensive research since more than twenty years. Nevertheless, several problems still have to be solved. This paper, after recalling the most popular physical attacks, introduces three (of the many) possible research directions in the area: the methodological study of the interaction between countermeasures against one type of attack and the resistance against another attack, the development of automated techniques for applying and verifying the correct application of countermeasures, and the study of physical attacks in the novel and changed scenario of cyber-physical systems.
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