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METHOD AND APPARATUS FOR CHECKING ROUND TRIP TIME BASED ON CHALLENGE RESPONSE, AND COMPUTER READABLE MEDIUM HAVING RECORDED THEREON PROGRAM FOR THE METHOD

  • US 20090055645A1
  • Filed: 07/25/2008
  • Published: 02/26/2009
  • Est. Priority Date: 08/21/2007
  • Status: Abandoned Application
First Claim
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1. A method of checking a round trip time (RTT) based on a challenge response, the method comprising:

  • generating a random number;

    encrypting the random number using a symmetrical key;

    transmitting a challenge request message including the encrypted random number to a device;

    receiving a challenge response message including the random number from the device which received the challenge request message and decrypted the encrypted random number using the symmetrical key; and

    determining an RTT based on a time when the challenge response message is received and a time when the challenge request message is transmitted.

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