Patent ID: 9007213
Filing Date: 2015-04-14
Classification: G06K

Abstract:
1. A method for using imperfections induced by fabrication variations for identification/authentication of an object, the method comprising the steps of: connectively positioning a micromechanical resonator structure with respect to the object, the micromechanical resonator structure having a substantially unique characteristic signal; the substantially unique characteristic signal being produced by induced motion of the micromechanical resonator structure; uniqueness of the substantially unique characteristic signal resulting from the imperfections induced by the fabrication variations; exciting motion of the micromechanical resonator structure to induce an excitation response signal; said excitation response signal comprising a vibration spectrum, a spectrum of the induced motion, phase as a function of frequency for the induced motion and phase of response with respect to a detection subsystem; detecting features of the excitation response signal; and comparing the features of the excitation response signal to a stored substantially unique characteristic signal; the stored substantially unique characteristic signal being obtained by exciting motion of the micromechanical resonator structure to induce the substantially unique characteristic signal, detecting features of the substantially unique characteristic signal and storing the detected features as the stored substantially unique characteristic signal; the stored substantially unique characteristic signal uniquely identifying the object within a class of objects; the stored substantially unique characteristic signal being such that regeneration or reassignment of the stored substantially unique characteristic signal to another object within the class is highly unlikely or effectively impossible; whereby the object is identified/authenticated.