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Temporal proximity to verify physical proximity

  • US 8,352,582 B2
  • Filed: 06/28/2001
  • Issued: 01/08/2013
  • Est. Priority Date: 06/28/2001
  • Status: Active Grant
First Claim
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1. A security apparatus system comprising:

  • a verifier apparatus configured to determine an authorization to process protected material to facilitate an assessment of physical proximity of a source of a response based on an assessment of response times associated with one or more responses received from an unknown second source to one or more requests issued from a first source to the unknown second source;

    a timer apparatus, operably coupled to the verifier apparatus, configured to measure response times between a request for content from a first source and a response from the unknown second source;

    a memory to store the response times for limiting subsequent access of unauthorized users or notifying an external source of the unauthorized users;

    wherein each of the one or more requests issued from the first source comprise a request for access to randomly selected source information from the unknown second source;

    wherein the assessment of the response times forms an assessment of whether the one or more responses were communicated locally to the verifier apparatus or via a network connection; and

    wherein the assessment of the one or more responses performed by the verifier apparatus comprises;

    continuously requesting randomly selected source information from the unknown second source unit until a statistically observable difference from an expected response time of a local source is detected; and

    wherein the one or more responses are stored for limiting subsequent access of the unauthorized users or notifying an external source of the unauthorized users.

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