Abstract: Aspects of the disclosed technology provide a method comprising executing different first and second instructions a first and second number of times, respectively, in repeated alternations. The method further comprises measuring spectra of signals emanating as a result of the processor executing the first and second instructions. The method also includes analyzing data indicative of the spectra of the signals to determine side-channel candidate side-band pairs that each have a lower and upper sideband at first and second frequencies, respectively, that are separated by approximately twice the respective alternation frequency. Finally, the method includes identifying a side-channel carrier frequency at a frequency approximately at a midpoint between a side-channel candidate side-band pair's first and second frequency.

Abstract: Aspects of the disclosed technology provide a method comprising executing different first and second instructions a first and second number of times, respectively, in repeated alternations. The method further comprises measuring spectra of signals emanating as a result of the processor executing the first and second instructions. The method also includes analyzing data indicative of the spectra of the signals to determine side-channel candidate side-band pairs that each have a lower and upper sideband at first and second frequencies, respectively, that are separated by approximately twice the respective alternation frequency. Finally, the method includes identifying a side-channel carrier frequency at a frequency approximately at a midpoint between a side-channel candidate side-band pair's first and second frequency.

Abstract: Aspects of the disclosed technology provide a method comprising executing, at a first processor and over a predetermined time period, first and second instructions in repeated alternations, wherein each alternation comprises executing the first instruction a predetermined number of times followed by executing the second instruction the predetermined number of times. Further, the method comprises measuring, via a measuring apparatus, a side-channel signal that results from the first processor executing the first and second instructions in repeated alternations. Additionally, the method comprises filtering, by a second processor, a spectral component of the measured side-channel signal, and analyzing, by the second processor, the filtered spectral component of the measured side-channel signal to determine power spectral density within a frequency range of the filtered spectral component.

Abstract: Aspects of the disclosed technology provide a method comprising executing, at a first processor and over a predetermined time period, first and second instructions in repeated alternations, wherein each alternation comprises executing the first instruction a predetermined number of times followed by executing the second instruction the predetermined number of times. Further, the method comprises measuring, via a measuring apparatus, a side-channel signal that results from the first processor executing the first and second instructions in repeated alternations. Additionally, the method comprises filtering, by a second processor, a spectral component of the measured side-channel signal, and analyzing, by the second processor, the filtered spectral component of the measured side-channel signal to determine power spectral density within a frequency range of the filtered spectral component.