Dynamic response of power delivery network for attestation and identification

An authenticator for authenticating a device in a system using electrical properties in the system, the authenticator comprising:

• a hardware processor operable to:
• receive, from a requestor, a plurality of input seed values;
• generate, for each input seed value the plurality of input seed values, load stimuli for generating an electrical load sequence on a power delivery network powering at least part of the system, the electrical load sequence relating to at least one magnitude and phase component in a specific frequency band corresponding to a dynamic response of the system;
• receive data representing noise induced in the power delivery network in response to the electrical load sequence measured using one or more sensors located on the power delivery network;
• determine, based on the measured noise, a dynamic response property of the power delivery network corresponding to the each input seed value;
• generate, from the dynamic response property of the power delivery network a plurality of authentication response values, each authentication response value of the plurality of authentication response values relating to the at least one magnitude and the phase component in the specific frequency band corresponding to the determined dynamic response property;
• and
• return the dynamic response property of the power delivery network to the requestor, the requestor operable to compare the authentication response values to known authentication response values to authenticate the device.