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US 11,796,612 B1Granted
Micromagnet PUF readout using a quantum diamond microscope
AssigneeNational Technology & Engineering Solutions of Sandia, LLC
InventorsPauli Mark Kehayias, Ezra Bussmann, Tzu-Ming Lu, Andrew Mounce
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Abstract
A physically unclonable function (PUF) and a method of reading it are provided. The PUF is constituted by a microfabricated array of randomly polarized micromagnets disposed on a substrate. The PUF can be read by creating a magnetization map of the PUF from the signal output of a quantum diamond microscope (QDM) and converting the magnetization map to a numerical sequence.
Claims14
A method of reading a physically unclonable function (PUF) disposed on a substrate, comprising:
- creating a magnetization map of the PUF from a signal output by a quantum diamond microscope (QDM), the creating step including:
- (a) imaging a pattern of nitrogen-vacancy (NV) fluorescence onto a plurality of pixels of a focal plane array;
- (b) grouping the pixels of the focal plane array into cells corresponding to respective micromagnets of the PUF;
- and
- (c) determining a polarity for each cell;
- and
- converting the magnetization map to a numerical sequence.
4 more elements
Dependencies are inferred from the claim text.