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TRUST-BASED METHODOLOGY FOR SECURING VEHICLE-TO-VEHICLE COMMUNICATIONS

  • US 20100201543A1
  • Filed: 02/09/2009
  • Published: 08/12/2010
  • Est. Priority Date: 02/09/2009
  • Status: Active Grant
First Claim
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1. A method for determining whether information received from a vehicle is reliable in a vehicle-to-vehicle communications system, said method comprising:

  • receiving a message from a suspect vehicle by a subject vehicle;

    determining whether there is a memory bucket stored on the subject vehicle for the suspect vehicle;

    creating a memory bucket for the suspect vehicle if a memory bucket for the suspect vehicle does not exist on the subject vehicle;

    transmitting a challenge question from the subject vehicle to the suspect vehicle to determine whether the suspect vehicle is reliable;

    increasing a number of tokens in the bucket for the suspect vehicle if the suspect vehicle responds to the challenge question with a correct answer;

    decreasing the number of tokens in the token bucket for the suspect vehicle if the response to the challenge question is incorrect;

    accepting the message from the suspect vehicle if a number of tokens in the bucket for the suspect vehicle is greater than a predetermined upper threshold; and

    discarding the message from the suspect vehicle if the number of tokens in the bucket for the suspect vehicle is less than a predetermined lower threshold.

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