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

摘要

PROBLEM TO BE SOLVED: To provide a method and an apparatus for checking a round trip time (RTT) based on a challenge response as well as a computer readable medium having recorded thereon a program for the method.;SOLUTION: The present invention relates to a challenge response based RTT checking method including the steps of: 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, from the decrypted device; and determining an RTT on the basis of a time when the challenge response message is received and a time when the challenge request message is transmitted. Thus, adjacency between devices can be efficiently checked.;COPYRIGHT: (C)2009,JPO&INPIT