IC card system having a function of authenticating destroyed data

• US 5,185,798 A
• Filed: 03/08/1991
• Issued: 02/09/1993
• Est. Priority Date: 07/26/1989
• Status: Expired due to Fees

• Current Assignee: NTT Data Communications Systems Corporation
• Original Assignee: NTT Data Communications Systems Corporation
• Inventors: Lee, Young S., Hamada, Hiromi, Hirano, Kazuya
• Primary Examiner(s): Buczinski, Stephen C.
• Application Number:
  US07/663,950
• Time in Patent Office: 704 Days
• Field of Search: 380/23, 380/24, 380/25, 235/382
• US Class Current: 705/68
• CPC Class Codes: G06K 17/0022 arrangements or provisious for transferring data to distant stations, e.g. from a sensing device "transfer between computer elements G06F13/00 "; data-transmission H04L
• CPC Class Codes: G06K 19/073 Special arrangements for circuits, e.g. for protecting identification code in memory protection against unauthorised use of computer memory G06F12/14
• CPC Class Codes: G06K 19/12 the marking being sensed by magnetic means
• CPC Class Codes: G06Q 20/341 Active cards, i.e. cards including their own processing means, e.g. including an IC or chip
• CPC Class Codes: G06Q 20/355 Personalisation of cards for use
• CPC Class Codes: G06Q 20/3672 initialising or reloading thereof
• CPC Class Codes: G06Q 20/3676 Balancing accounts
• CPC Class Codes: G07F 7/082 Features insuring the integrity of the data on or in the card
• CPC Class Codes: G07F 7/1008 Active credit-cards provided with means to personalise their use, e.g. with PIN-introduction/comparison system

Abstract

An IC card includes, in addition to an ordinary data recording processing circuit, an IC chip area including an encrypting circuit, and a magnetic or optical data recording unit mounted thereon. Those items of data at an initialization and final transaction times are recorded in the magnetic or optical data recording unit while a predetermined encryption is made in cooperation with the IC chip area and the terminal for initialization and terminal for transaction. When a data item to be recorded n the IC chip area in the IC card is destroyed, data items recorded on the magnetic or optical data recording area are decrypted to check if the recorded data items are true. If yes, these data items are restored in a new card.

Claims

1. An IC card system for enabling data, which is stored in an IC card having an IC chip area and an optical data recording area at a predetermined area on the IC card, to be authenticated in cooperation with a predetermined terminal, said IC card system comprising:

first means for enabling data, which data is contained in connection with a final transaction by the IC card, to be subjected to a processing operation with a transaction authentication code generated in accordance with a code function and an authentication individual key specific for the IC card, the processing operation being done through predetermined data processing made between an external terminal including a common processing unit and an external read/write unit, said terminal being an initialization terminal or a transaction terminal, and said first means further including means for storing the resulting processed data in the IC chip area of the IC card;

second means for transferring said resulting processed data to the optical data recording area of the IC card via the read/write unit of the terminal and for recording said resulting processed data on said optical data recording area of the IC card; and

third means for checking said resulting processed data associated with the final transaction which is recorded on said optical data recording area, for truthfullness with the use of a code or decoding function of said rear/write unit and common processing unit, when data in the IC chip area of the IC card is destroyed.

2. The system according to claim 1, further comprising fourth means for, when the truth of the data checked by said third means is authenticated as being true, transferring that data from said transaction terminal to said initialization terminal and for restoring the transferred data into a new IC card.

3. The system according to claim 1, wherein said data checked by said third means contains data on a prepaid balance.