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Method to detect man-in-the-middle (MITM) or relay attacks

  • US 20090168997A1
  • Filed: 12/27/2007
  • Published: 07/02/2009
  • Est. Priority Date: 12/27/2007
  • Status: Active Grant
First Claim
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1. A method for detecting a communication relay attack comprising the steps of:

  • establishing a communication link between a data transmitting device and a data receiving device;

    transmitting a clock signal from said data receiving device to said data transmitting device for synchronizing data communication between said data transmitting device and said data receiving device;

    transmitting data from said data transmitting device to said data receiving device, said data having a first predefined element and a second predefined element;

    counting a number of clock cycles occurring in said clock signal between transmission of said first predetermined element of said data and transmission of said second predefined element of said data with said data transmission device;

    counting a number of clock cycles occurring in said clock signal between receipt of said first predefined element of said data and receipt of said second predefined element of said data with said data receiving device; and

    comparing said number of clock cycles counted by said data transmission device with said number of clock cycles counted by said data receiving device.

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