JPS5971180A - Information processing method in ic card - Google Patents

Abstract

PURPOSE:To erase the information stored in an IC card except specific information by reading out and storing the information stored in the specified area of the memory area, erasing the stored information in the lump, and writing the stored information again into the IC card. CONSTITUTION:A readout mode to read a specified area is designated to the card. After the readout mode is inputted, the information stored in the EEPROM is selected, to output the information only to the IC card processor, and is stored in the RAM buffer in the IC card processor once. An erase mode is designated to the IC card to erase all the information stored in the EEPROM after the information stored in the RAM buffer is finished for writing to the specified area of the EEPROM in the IC card by designating a write mode again for the information stored in the RAM buffer to obtain the IC card with the specified area in the EEPROM storing the information. Conventional use is possible as the IC card.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an integrated circuit for inputting and outputting information to an electrically erasable IC card (OM) and a built-in logic circuit such as a microcomputer (microprocessor).
This relates to an information processing method in the C card 1.

Cards with embedded IC elements, so-called IC cards, are widely used as personal identification cards such as credit cards, bank cards, and credit cards, as well as for information files and other purposes. It's here. By the way, the conventional method of using IC cards is to write information one by one (there is a write-once method, a method in which information is written to all the memory at once and saved, etc.). However, in these conventional methods, If it is desired to retain part of the specific information in the memory and erase only the information in the other memory, this may not be possible depending on the type of built-in memory embedded in the IC card.

The memory for storing information built into an IC card is
Writable l (IJM (Prograrrmable)
eI (IIJM; PROM) is often used, but as a type of PROM, T(<)M (circle aM), which cannot be erased using a destructive recording method, erases information written by ultraviolet irradiation. ROM (Erasab
le and ProgrammableROM;
EPRDM), [Brasable and Pr
For IC cards, there are PRUM and EP) (for OM,
Once information is written, it cannot be erased, so there is no room for writing information in memory (such as rc data).
Or, if the stored information is no longer needed, create a new one.
If I didn't use the 0 card, I couldn't do it. In addition, if EEPROM is used as the memory built into the card, when the recorded information is no longer needed, it is possible to erase the contents and use the same card again, whereas conventional IC cards In the information processing method in , all the information stored in the memory is erased, so it is not possible to leave only a part of the specific information in the memory.
After erasing all the information, new information in the specific area must be input (or input) from an external device and written. In this case, there is a risk of incorrectly inputting information, and it is difficult to operate, which makes it impractical.

By the way, please leave the information on the above specific area and send information on other areas@! Erasing operations can be performed by byte by byte 7c
This can be easily done when using EEiE'lbutM, but in this case as well, if there are many specific areas and they are distributed in memory, it is necessary to specify each byte as an erase area. The task of distinguishing between regions becomes extremely complicated. In addition, even in cases where only one specific area is left behind and erased, the method of repeatedly erasing each byte has the drawbacks of unnecessarily complicating control, prolonging processing time, and being inefficient. (3) There was.

Therefore, the purpose of the present invention is to eliminate the drawbacks of conventional information processing methods for IC cards, and to eliminate some of the stored information in advance for IC cards that can erase stored information all at once. An object of the present invention is to provide an information processing method in an IC card that makes it possible to efficiently and accurately retain a specific area and erase only other areas.

This invention will be explained below.

The present invention provides for erasing information stored in an IC card that is equipped with an air-erasable card and a logic circuit such as a microcomputer (microprocessor). IC before erasing information
After reading and retaining the information stored in a specific area in the memory area of the card, and erasing the information stored in the IC card all at once, the retained information is read out and retained.
By writing in the IC card, the information stored in the IC card can be erased except for specific information5) (4). The attached figure shows a preferred embodiment of the present invention, and shows the information (for example, personal identification information, IC card serial number) stored in one of the 44 fixed areas in the IC card. When erasing stored information other than the above, first, a read mode for reading a specific area is specified for the card (step 81). And I
A program installed for a specific area in the EEPROM is input to the microcomputer in the C card, and after the above read mode is input, the information stored in the EEPROM is isolated, Step 8: Output only the information recorded in a specific area to the IC card processing device.
2) The read information - in the HIC card processing device 17
') Store in RAM/<tufa (step 83).

After reading out information from a specific area in the IC card, and after all the information has been read out, erase mode is specified for the IC card (steps 84 and '85).
. As a result, all the information stored in the EEP in the IC card is erased (step S5), and after that, the information stored in the tone buffer (r+N) is erased from the IC card by specifying the write mode again. Convolution into a specific area within P 80M (step S7). When rewriting of the information stored in the r(AM buffer to the specific area is completed (step S8)
8) It is possible to obtain an IC card in which EEPl (Information code) is stored in a specific area within 0M, and it can be used as an IC card in the conventional manner.

Note that the specific area within EEPTiOM is programmed into the microcomputer when the IC card is created, so it is not possible to change or increase the specific area while the IC card is in use. t [
It's on. In addition, the information stored in the specific area may be fixed information such as personal identification information or the IC card's serial number.If you delete the information stored in the EEPHOM and reuse the card, Erasing can be performed automatically leaving only a specific area, and there is no possibility of storing erroneous information in a specific area.

As explained above, according to the processing method of the present invention, it becomes possible to efficiently and accurately perform tasks that were time-consuming with conventional IC cards, resulting in an extremely effective information processing method for IC cards.

[Brief explanation of drawings]

The attached figure is a flowchart showing one embodiment of the present invention. 81-S9...Processing steps. Applicant's agent Yu Yasugata Engraving of three drawings (
No change in content) Procedural amendment (Method) % formula % 1. Indication of the case Patent Application No. 181834 of 1981 2. Name of the invention Information processing method in an IC card 3. Person making the amendment Relationship with the case Patent applicant Dai Nippon Printing Co., Ltd. 4, agent Nomura Building 7F, 18-18 Nishi-Shinjuku-ku, Shinjuku-ku, Tokyo
Telephone (348) 77057877 Patent Attorney Yasu Kata 35, Date of amendment order February 2, 1980 (Shipping date February 22, 1988) e. Power of attorney subject to amendment, specification and drawings 7, Subject to be amended (+) Amend the power of attorney as shown in the attached sheet. (2) An engraving of the specification (no changes to the content) (3) The drawings attached to this application will be amended as shown in the attached sheet.

Claims (1)

[Claims] 1. For an IC card equipped with an electrically erasable ROM and a logic circuit such as a microcomputer,
When performing the process of erasing information stored in a C card, prior to erasing the information, the information stored in a specific area in the memory area of the IC card is read out and held, and the information is stored in the IC card. After erasing the stored information all at once, by writing the retained information into the TC card again, the information stored in the IC card can be erased except for specific information. An information processing method in an IC card, characterized in that: 2. The information processing method in an IC card according to claim 1, wherein the information stored in a specific area in the memory area of the IC card is personal recognition information. 3. The information processing method in an IC card according to claim 1, wherein the information stored in a specific area in a memory area of the IC card is a serial number of the IC card.