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A new digital countermeasure against attacks related to the clock frequency is presented. This countermeasure, known as frequency sensor, consists of a local oscillator, a transition detector, a measurement element and an output block. The countermeasure has been designed using a full-custom technique implemented in an Application-Specific Integrated Circuit (ASIC), and the implementation has been verified and characterized with an integrated design using a 0.35 µm standard Complementary Metaldoi:10.3390/s130911709 pmid:24008285 pmcid:PMC3821354 fatcat:hcdk3ne7kng5vgpk5uajtsfx74