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Challenge-response proximity verification of user devices based on token-to-symbol mapping definitions

  • US 10,158,684 B2
  • Filed: 09/26/2016
  • Issued: 12/18/2018
  • Est. Priority Date: 09/26/2016
  • Status: Active Grant
First Claim
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1. A method, comprising:

  • at an access server configured to communicate over a network with a video conference device and a user device, the access server and the user device having access to known mappings, including a default mapping, each mapping configured to map between multi-bit tokens and symbols according to a distinct mapping relationship between the multi-bit tokens and the symbols;

    first instructing the video conference device to map an initial token to an initial symbol based on the default mapping and to transmit the initial symbol;

    receiving from the user device the initial token and an indication of a challenge mapping selected from the mappings by the user device, and responsive to the receiving;

    determining among the tokens a challenge token that the challenge mapping maps to a challenge symbol; and

    second instructing the video conference device to transmit the challenge symbol; and

    waiting to receive the challenge token from the user device and, if the challenge token is received from the user device, granting the user device access to an information carrying channel between the video conference device and the user device.

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