Patent ID: 11963068
Assignee: GUARDTIME SA
Field: Digital communication (Electrical engineering)
Classification: CPC G  H | IPC H

Claim 0:
1. A method for verifying proximity between two devices comprising:
in a mobile device:
sensing proximity to a location device;
obtaining a mobile device token, said mobile device token being a first data structure that includes an encoding of an identifier of the mobile device; and
at an interaction time, inputting from the location device a location token, said location token being a second data structure including an encoding of an identifier of the location device;

generating a travel token as a digital combination of the mobile device token and the location token, as well as a interaction time indication, said location token being created by and allocated by a tracking service provider to the location device;
transmitting the travel token to the tracking service provider; and
obtaining a first digital signature for the travel token;
said mobile device token being created by and allocated by a tracking service provider to the mobile device;
said mobile device token including an indication of a risk level.