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Method and Devices for Secure Measurements of Time-Based Distance Between Two Devices

  • US 20090217037A1
  • Filed: 06/02/2006
  • Published: 08/27/2009
  • Est. Priority Date: 06/20/2005
  • Status: Abandoned Application
First Claim
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1. A method of secure calculation at a first device of time based distance to a second device in a network, comprising the steps of:

  • sending a first message sent to the second device;

    receiving from the second device a second message sent in response to the first message;

    calculating the time distance based on the time of transmission of the first message and the time of reception of the second message;

    receiving a further message comprising authentication data cryptographically linked to one of;

    at least the first message, at least the second message, and at least the first message and the second message; and

    verifying the authentication data.

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