Purchase manner of the purchase item which uses the network system and the network system, purchase manner null of the purchase item which the plug in software of Internet browser of the client in the network system and the plug in software of Internet browser of the client in the network system

摘要

PROBLEM TO BE SOLVED: To automatically change a log-in ID for authenticating a server and a client in every prescribed time to enhance security of a network.;SOLUTION: There are provided, in the server 1 and the client 2, system clock synchronizing means 9, 14 for synchronizing system clocks 6, 12 thereof with an Internet standard time, storage means 4, 11 for storing arrayingly the plural log-in IDs for authenticating the server 1 and the client 2 mutually, and log-in ID changing means 8, 13 for retrieving repeatingly the plural log-in IDs of the storage means 4, 11 from the top thereof toward a tail side and for changing the log-in ID retrieved in the every prescribed time each time as an up-to-date log-in ID.;COPYRIGHT: (C)2002,JPO