Magnetic PUF with predetermined information layer
The invention adds a Physical Information Layer (“PIL”) to the magnetic particles within a matrix that creates an unclonable physical unclonable function “object.” The PIL assists in searching to find the combination that matches a pre-determined enrolled combination with additional information that includes a search index, which limits the range of data required to search in order to find a match in the enrolled database. The index could be a predetermined value that associates the random magnetic profile values to a list of enrolled values in a database. The additional information may include product or general information that needs to be easily communicated to a user of the PUF.
1. A method of simultaneously reading a location of a known element and a random element such the locations of the known element and the location of the random element are paired, thus tying the locations together, comprising:
providing a physical information layer (“PIL”) with a conducting material;
placing the PIL over a physical unclonable function element (“PUF”), where the PIL has a conducting material that is at least one order of magnitude larger than a pre-magnetized particle within the PUF, further wherein the PIL is constructed from a material that does not substantially alter a static magnetic field created by the pre-magnetized particles and a matrix dielectric material;
using a sensor to simultaneously detect the conducting material of the PIL and the pre-magnetized particles in the PUF, wherein the sensor distinguishes between the conducting material and the pre-magnetized particles, further wherein the PIL uses the conducting material locations as a point of reference when paired with the pre-magnetized particles in the PUF that orient an enrollment of a magnetic profile of the PUF; and
using the PIL to find a match in an enrolled database for the magnetic profile for verification against a unique random magnetic information.
2. The method of claim 1 , wherein the PIL is capacitively detectable.
3. The method of claim 1 , wherein the PIL is optically detectable.
4. The method of claim 1 , wherein the PIL is acoustically detectable.
5. The method of claim 1 , wherein the fiducials are box structures.