1. A method of authenticating a board, assembly or system, the method comprising: obtaining or processing test/scan information provided via extraction of unique identifying information regarding one or more devices on a board, assembly or system, including determination of associated mounted position(s); performing one or more re-authentication processes to verify that the board, assembly or system contains only legitimate uniquely identified devices, via comparison of re-extracted codes of devices at known positions against a reference record, the reference record being established by an initial authentication process that utilizes information regarding authentic and unique codes of devices delivered to populate the board, assembly or system as placed at specific positions to derive the reference record for the device, enabling the re-attestation of the authenticity of such devices.