US 11,985,259 B2
Unified multi-die physical unclonable function
Jennifer E. Howard, Prosper, TX (US); Colby K. Hoffman, Fairview, TX (US); Edward Escandon, McKinney, TX (US); Albert D. Marzullo, Plano, TX (US); Ross MacKinnon, McKinney, TX (US); and Maegen A. Forrer, Farmersville, TX (US)
Assigned to RAYTHEON COMPANY, Waltham, MA (US)
Filed by RAYTHEON COMPANY, Waltham, MA (US)
Filed on Jun. 24, 2021, as Appl. No. 17/357,067.
Prior Publication US 2022/0417041 A1, Dec. 29, 2022
Int. Cl. H04L 9/32 (2006.01); H04L 9/08 (2006.01)
CPC H04L 9/3278 (2013.01) [H04L 9/0866 (2013.01); H04L 2209/12 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A multi-die device comprising:
a first die including a plurality of first die signal path elements configured to propagate a plurality of stimulus signals including a first stimulus signal and a separate second stimulus signal different from the first stimulus signal;
a second die including a plurality of second die signal path elements configured to propagate the first and second stimulus signals; and
an interposer configured to establish signal communication between the first die and the second die so as to deliver the first and second stimulus signals from the plurality of first die signal path elements to the plurality of second die signal path elements to generate a propagation delay;
wherein the propagation delay is used to generate a single unified physical unclonable function (PUF) response that is indicative of the authenticity of the multi-die device.