Abstract: A method of determining whether a processing unit is compliant with a security policy is provided. The method may comprise obtaining first data indicative of a power consumption profile of the processing unit for a first time period, the power consumption profile comprising a variation of power consumption with time. The method may comprise determining whether the processing unit is compliant with the security policy during the first time period depending, at least in part, on the obtained first data. It may be that the processing unit complying with the security policy gives rise to a power signature in the power consumption profile of the processing unit during a period of compliance.

Abstract: In some examples, an electronic device includes a display panel, voltage circuitry to provide a voltage output to the display panel, and a controller. In some examples, the controller sets the voltage output of the voltage circuitry to a first voltage. In some examples, the controller obtains a first display panel power measurement at the voltage output. In some examples, the controller compares the first display panel power measurement with a second display panel power measurement. In some examples, the controller changes the voltage output to a second voltage based on the comparison.