Abstract
Of the many interesting articles in this issue of <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">IEEE Design&Test</i> , one particular article by Zhou et al. grabbed my attention. The article showed that hardware performance counters, which count instances of microarchitectural events, cannot distinguish between a system in normal operation and a system under attack. One reason given is the gap between the functional behavior of a system and the behavior at the microarchitectural level. Therefore, it is best to look for incursions at the functional level and distinguish good from any suspicious behavior there.
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