US 11,792,025 B2
Methods of verifying that a first device and a second device are physically interconnected
Karl Norrman, Stockholm (SE); Elena Dubrova, Sollentuna (SE); and Bernard Smeets, Dalby (SE)
Assigned to Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
Appl. No. 16/471,973
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
PCT Filed Feb. 10, 2017, PCT No. PCT/EP2017/052955
§ 371(c)(1), (2) Date Jun. 20, 2019,
PCT Pub. No. WO2018/145755, PCT Pub. Date Aug. 16, 2018.
Prior Publication US 2020/0099541 A1, Mar. 26, 2020
Int. Cl. H04L 9/32 (2006.01); G06F 7/58 (2006.01); H04L 9/08 (2006.01); H04W 12/06 (2021.01); H04W 12/12 (2021.01)
CPC H04L 9/3278 (2013.01) [G06F 7/588 (2013.01); H04L 9/0866 (2013.01); H04W 12/06 (2013.01); H04W 12/12 (2013.01); H04L 2209/12 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of verifying that a first device and a second device are physically interconnected, the method is performed by a verifier and comprising:
sending a challenge to the first device for use as basis for input to a first physical unclonable function (PUF) part of a composed PUF, wherein the first PUF part of the composed PUF is arranged in the first device;
receiving a response from the second device, the response is based on an output of a second PUF part of the composed PUF, wherein the second PUF part of the composed PUF is arranged in the second device; and
verifying that the first device and the second device are interconnected when the received response and an expected response fulfill a matching criterion,
wherein the first PUF part and the second PUF part are physically interconnected by means of a third part of the composed PUF through pins of the first device and the second device,
wherein the third part of the composed PUF comprises two buses,
wherein a size of the response is equal to a size of the challenge, and
wherein a verification loop is run for a predetermined number of times by applying the response as a next challenge at a next loop iteration.