AUTHENTICATION METHOD/SYSTEM USING IC CARD

摘要

PROBLEM TO BE SOLVED: To improve the responsiveness of authentication without impairing safety by satisfying and storing initial authentication by using a card when a user makes communication at first with a communication opposite party and executing reauthentication based on the stored authentication information when he makes communication again with the opposite party within prescribed time. SOLUTION: A user terminal 12 makes communication with the application server 14 of the communication opposite party through communication parts 12f and 14a and a communication line 13, and they authenticate whether mutual authentication information exist in authentication information storage parts 12e and 14d. When they do not exist, an authentication processing control part 12d judges it to be the first communication, causes initial authentication processing parts 12b and 14b to execute an initial authentication procedure by an open key cipher system by using the IC card 10 with the control of an IC card control part 12a. When they exist, the control part 12d causes reauthentication processing parts 12c and 14c to execute a reauthentication procedure by a secret key cipher system. Thus, the frequency of the authentication of the card 10 which takes a long time can be made small to improve the operability of the user.