Patent ID: 6888442
Filing Date: 2005-05-03
Classification: G06K,G07D

Abstract:
1. A method of processing a substrate to impart a security identification thereto comprising the steps of: (a) affixing a random distribution of dielectric components with said substrate, said dielectric components having a dielectric constant sufficiently larger than that of said substrate as to exhibit molecular level electric dipole moments that cause a detectable modification of an external electric field passing through said substrate in accordance with said random distribution; (b) coupling said substrate, to which said random distribution of dielectric components has been affixed in step (a), with an electric field; (c) measuring a modification of said electric field with which said substrate is coupled in step (b), and generating an output signal representative of said modification; (d) storing information representative of said output signal in a storage medium separate from said substrate; (e) coupling said substrate, to which said random distribution of dielectric components has been affixed in step (a), with an electric field; (f) measuring a modification of said electric field with which said substrate is coupled in step (e), and generating an information signal representative of the measured modification; and (g) comparing contents of said information signal generated in step (f) with said information stored in said storage medium in step (d), to verify the validity of said substrate.