An equivalent circuit architecture and attendant methods for generating a physically unclonable function (PUF) response include a plurality of devices capable of generating a voltage output, a voltage source, and a microcontroller adapted to receive the voltage output from each device of the plurality of devices. The devices may be energy harvesting devices or sensors. The microcontroller is configured to determine an average peak voltage for predefined groups of the plurality of devices, to compare summation voltage values for the predefined groups, and from that information to output response values defining a 128-bit PUF response. The microcontroller determines a peak voltage of each device of the plurality of devices an equal number of times to generate the 128 bit PUF response value, this preventing biasing the response towards any individual device or group of devices.