Patent ID: 11936798
Assignee: NOKIA TECHNOLOGIES OY
Field: Computer technology (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 5:
6. A method for securing a provable resource possession on a host device having spawned a number of virtual machines providing services to a client device, the method comprising:
sending a challenge request to respective virtual machines of the number of virtual machines, the challenge request containing a physically unclonable function (PUF) challenge and a filter rule, the filter rule corresponding to a selected portion of a PUF response with respect to an identifier of a respective virtual machine, and the selected portion of the PUF response depending on the number of virtual machines;
receiving a PUF filtered response from the respective virtual machines; the PUF filtered response being the PUF response that is filtered according to the filter rule and obtained by challenging a PUF component of the host device with the PUF challenge;
combining the PUF filtered responses from the respective virtual machines into a reconstructed PUF according to the filter rule; and
in response to the reconstructed PUF corresponding to an expected response in a challenge-response database, validating that the number of virtual machines is effectively running on the right host device.