IC CARD FOR SECURITY ATTESTATION AND IC CARD SERVICE SYSTEM USING SAID IC CARD.

摘要

A program for generating individual keys from a base key is stored in a memory in each SA card (12) in the production of SA cards. Next, the base key is stored in a secret area in the memory, data stored in which cannot be read out from outside, in the SA card (12) by an SA card issuing machine. When issuing individual user cards (13), a user card issuing machine transmits ID or the like of the card to the SA card (12), prepares the individual keys by use of the individual key generation program and stores the received individual keys in the secret area in the memory of the user card (13). At the time of use, the card ID or the like of the user card is transmitted from the user card (13) to the SA card (12) and the SA card prepares the individual key of the user card from the reception information and shares the individual key. In this manner, the IC card service system can execute various attestations by use of the functions such as encoding and decoding of data without making on-line inquiry to the center side.