ELONGATED PHYSICAL UNCLONABLE FUNCTION

摘要

An elongate physical unclonable function (PUF) is disclosed. The PUF has a longitudinal axis and contains a plurality of small magnetic particles. A much larger magnet is positioned on the longitudinal axis to indicate a home position. A low-cost linear translation mechanism may be used to read the PUF by referencing position information to the home position. Other devices are disclosed.

主权项

1. An imaging device supply item comprising:
a body; an elongate physical unclonable function (PUF) located on the body having a longitudinal axis and containing a plurality of magnetized particles each having a volume less than one cubic millimeter in a non-magnetic substrate; and a magnet having a volume of at least five cubic millimeters located on the body within five millimeters, inclusive, of the PUF located on the longitudinal axis of the PUF.