US 11,985,236 B2
Cryptographic key configuration using physical unclonable function
Didier Hunacek, Cheseaux-sur-Lausanne (CH); Marco Macchetti, Cheseaux-sur-Lausanne (CH); and Jerome Perrine, Cheseaux-sur-Lausanne (CH)
Assigned to NAGRAVISION S.A., Cheseaux-sur-Lausanne (CH)
Appl. No. 17/256,673
Filed by NAGRAVISION S.A., Cheseaux-sur-Lausanne (CH)
PCT Filed Jun. 21, 2019, PCT No. PCT/EP2019/066456
§ 371(c)(1), (2) Date Dec. 29, 2020,
PCT Pub. No. WO2020/002146, PCT Pub. Date Jan. 2, 2020.
Claims priority of application No. 18180951 (EP), filed on Jun. 29, 2018.
Prior Publication US 2021/0160065 A1, May 27, 2021
Int. Cl. H04L 9/08 (2006.01); H04L 9/32 (2006.01)
CPC H04L 9/0866 (2013.01) [H04L 9/0841 (2013.01); H04L 9/3278 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of obtaining a cryptographic key in a chipset, the method comprising:
generating an initial configuration message using a physical unclonable function (PUF) of the chipset, wherein the PUF is configured to generate a predetermined value when using the initial configuration message as input to the PUF, and wherein the initial configuration message comprises helper data to generate the predetermined value;
transmitting the initial configuration message to a client access server;
receiving an altered configuration message from the client access server, wherein the altered configuration message is generated by the client access server based on the initial configuration message, the predetermined value, and a cryptographic key; and
using the altered configuration message as input to the PUF to generate the cryptographic key.