Seyed Hamidreza Moghadas Michael Pehl Georg Sigl ROPAD: Enhancing the Digital Ring Oscillator Probing Attempt Detector for Protecting Irregular Data Buses. 1716-1727 2022 30 IEEE Trans. Very Large Scale Integr. Syst. 11 https://doi.org/10.1109/TVLSI.2022.3191471 db/journals/tvlsi/tvlsi30.html#MoghadasPS22