Physical unclonable function region encoding
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.
Claims12
A method of regionally encoding a device comprising:
- affixing a physical unclonable function (“PUF”) to the device;
- mechanically keying a device region by placing a magnetic sensor on a reader at a different position depending on a region or geography in which the device is sold;
- and
- enrolling the device during manufacturing by scanning the magnetic enrollment data of the PUF at the appropriate position to correspond to the specific device's region.
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.
Dependencies are inferred from the claim text.