INFORMATION TERMINAL EQUIPPED WITH TIME OF DAY SYNCHRONIZATION FUNCTION, PROGRAM, METHOD AND DEVICE FOR TIME OF DAY SYNCHRONIZATION, INFORMATION TERMINAL EQUIPPED WITH TIME OF DAY VERIFICATION REQUESTING FUNCTION, PROGRAM, METHOD AND DEVICE FOR REQUESTING TIME OF DAY VERIFICATION

摘要

PROBLEM TO BE SOLVED: To enhance correctness of verified time of day by performing time stamp of electronic information based on exact time of day and by preventing the falsehood of verified time of day being forged or altered.;SOLUTION: A client 1 downloads a time of day verification requesting program 71 from a time of day verification server 7 and starts the program [figure (a)]. When the time of day verification requesting program 71 is started, a communication path 3 is secured between the time of day verification server 7 [figure (b)]. The time of day verification requesting program 71 synchronizes standard clock of the time of day verification server 7 with the standard time of day by obtaining time of day information via the communication path 3 [figure (c)]. Data requiring a time stamp is transmitted from the client 1 to the time of day verification server 7 together with a time stamp requirement time of day Treg [figure (d)]. The time of day verification server 7 performs time stamp to the data with the time stamp requirement time of day Treg [figure (e)].;COPYRIGHT: (C)2004,JPO