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US 11,416,193 B2Granted
Physical unclonable function (PUF) alters disk structure to encode region
AssigneeLexmark International, Inc.
InventorsScott Richard Castle, Gary Allen Denton, Robert Henry Muyskens, Samuel Leo Rhodus, Brant Dennis Nystrom, Carl Edmond Sullivan
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Abstract
A physical unclonable function (“PUF”) object can be used to encode the geography or region in which device to which the PUF is attached may operate. Disclosed are two potential ways to regionalize a device using a PUF disk: placing the magnetic sensor at a different radius depending on the region or geography intended for sale; and altering the magnetic structure of the disk to magnetically encode the region into the sensor data.
Claims6
A method of regionally encoding a device comprising:
- manufacturing a magnetic physical unclonable function (“PUF”) disk in a way that alters a magnetic structure of the disk to magnetically encode an intended region into a measured sensor data;
- enrolling the device during manufacturing by scanning the PUF at the appropriate position to correspond to the specific device's region;
- storing the scanned enrollment data in a secure non-volatile memory on the device for retrieval during authentication;
- and
- affixing the PUF disk to the device, wherein the magnetic structure is altered by a binary representation that is used to encode the region based on the presence and absence of magnetic field voids, or areas where the magnetic field is unchanged.
2 more elements
Dependencies are inferred from the claim text.