Patent ID: 9665748
Date: 2017-05-30
CPC Classifications: G03G,G06Q,G09C,H04L

Claim:
1. A supply item for an image forming device comprising: a body; a physical unclonable function located on the body configured to rotate about an axis of rotation having a shaft centered on the axis of rotation and a helical flight having a length wrapped around the shaft, the helical flight has a top surface and a side surface between the shaft and the top surface, the helical flight contains magnetized particles that generate a magnetic field adjacent to the side surface having a varying intensity along the length of the helical flight; and a non-volatile memory located on the body containing a first array of numbers corresponding to the intensity of the magnetic field normal to the side surface along a section of the length of the helical flight at a plurality of locations and also containing a digital signature generated from the first array of numbers.