Patent ID: 7529942
Filing Date: 2009-05-05
Classification: H04L

Abstract:
1. A time certification server, comprising: a receiving section configured to receive, from a terminal apparatus, an issue request for a time certification code and terminal information relating to the terminal apparatus, the terminal information including position of the terminal apparatus obtained by measuring a position of the terminal appartus; a temporal change information input section configured to input temporal change information; a first code generating section configured to generate a first code by perfoming a hash function on the temporal change information, output the first code; a second code generating section configured to generate a second code by perfoming a hash function on the received terminal information and the first code, and output section, and output the second code; a transmitting section configures to transmit to the terminal apparatus the second code as a time certification code; a time certification code memory section configured to store the time certification code in correlation with time; and a certification processing section configured to receive the time certification code from the terminal apparatus, search the time certification code memory section using the time certification code received, to obtain time correlating with the time certification code, and output certification information based on the time obtained to the terminal apparatus.