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Authentication for near field communications

  • US 9,755,700 B2
  • Filed: 04/22/2013
  • Issued: 09/05/2017
  • Est. Priority Date: 05/16/2012
  • Status: Active Grant
First Claim
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1. A system for use in a near field communications system for authenticating, at a near field communications receiver, a user of a near field communications transmitter, the system comprising:

  • a receiver device comprising a first data receiver and a second data receiver, each configured to receive a signal comprising a first unique identifier from a near field communications transmitter, the first unique identifier indicating a predetermined pattern of movement of the near field communications transmitter, the predetermined pattern of movement specifying a pattern of movement in and out of range of the near field communications receiver and a length of time that the near field communications transmitter spends within range for communication with the near field communications receiver;

    a received signal strength indicator configured to measure a signal strength of the received signal and to store the signal strength in a status register as one of three or more discrete levels;

    a signal strength tracker configured to track a variation with time of the signal strength of the received signal and to convert the variation with time into a second unique identifier that indicates an actual pattern of movement of the near field communications transmitter; and

    a comparator configured to compare the received first unique identifier and the second unique identifier and to output a signal indicating the result of said comparison,wherein the user is authenticated if the signal indicating the result of said comparison indicates that the first unique identifier matches the second unique identifier.

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