Patent ID: 9542576
Date: 2017-01-10
CPC Classifications: G03G,G06K,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 furthest away from the axis of rotation, the helical flight contains magnetized particles that generate a magnetic field above the top surface having a varying intensity along the length of the helical flight, the helical flight has a side surface between the shaft and the top surface; and a non-volatile memory located on the body containing a first array of numbers corresponding to the intensity of the magnetic field radial to the axis of rotation above the top surface along a section of the length of the helical flight at a first plurality of locations each at a first fixed distance from the side surface and also containing a digital signature generated from the first array of numbers.