JP2000163546A - Ic card and its using method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain both data read-only and data read/write enable IC cards from a single type of IC chip by providing an access limiting flag at a part of a memory of the IC chip for both reading and writing operations. SOLUTION: When a data read-only IC card is set, for example, a bit 0 is set at '0' with other bits 1-7 set at '1' respectively. Then the data to be read are written into a memory after the bit 0 is set at '0' and processed in terms of software so that the second and subsequent writing operations are inhibited after a single writing operation is over. This processing contents are allocated as a flag meaning that the access setting is over to the bit 7 of an 'nnnn' address. If this flag (bit) is set at '0', it's regarded that the setting is over and thereafter the 'nnnn' address is processed in terms of software so that the access is inhibited to the 'nnnn' address.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contact or non-contact type IC card used for an ID card, a commuter pass, a prepaid card, and the like, and more particularly to a flag setting for restricting access to an IC card. .

[0002]

2. Description of the Related Art Conventionally, an IC which can perform data communication with the outside in a contact or non-contact manner and can read only data or read and write data in a built-in memory.
In the card, an IC card dedicated to reading data,
In the case of manufacturing a readable and writable IC card, two types of IC chips each having a built-in memory are made, and these are embedded in a card-like substrate to manufacture two types of IC cards.

[0003]

However, since it is necessary to make two types of IC chips each having a built-in memory, the development cost is high and it is difficult to reduce the cost of the IC card.

[0004] Accordingly, the present invention provides an IC chip with an access restriction function so that one type of IC chip can be used.
An object of the present invention is to provide two types of IC cards that can be used exclusively for reading data and that can read and write, and methods of using the same.

[0005]

According to the present invention, a read-only flag or a flag for restricting access to enable reading and writing is provided in a part of a memory of an IC chip, and a flag at the time of factory shipment or in a market is provided. When an IC card is issued, a read-only or read-write IC card is authenticated, and after confirming its validity, an IC card that sets a read-only or read-write enabled access restriction flag is set. Can be provided.

That is, the present invention is an IC card characterized in that a part of a memory of an IC chip is provided with an access restriction flag relating to reading and writing.

Further, according to the present invention, a read / write access restriction flag is provided in a part of the memory of the IC chip, and when the IC card is issued, the read-only or read / write IC card is authenticated and authenticated. This is a method of using an IC card, wherein an access restriction flag is set to read-only or read / write after confirming the performance.

Further, the present invention is characterized in that, in said IC card, an access restriction flag for a read-only IC card or a readable / writable IC card is set by software after authentication. How to use

Further, the present invention is characterized in that in the above-mentioned IC card, an access restriction flag for a read-only IC card or a readable / writable IC card is set by hardware after authentication.
This is how to use the C card.

[0010]

Embodiments of the present invention will be described below.

First, a non-contact type IC card according to an embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a view showing a memory map of a nonvolatile memory built in an IC card, and shows an example of setting an access restriction flag. FIG. 2 shows an IC card and a reader /
FIG. 9 is a diagram illustrating a communication procedure when setting an access restriction flag between writers.

In the memory map shown in FIG.
An area for writing an access restriction flag at the address nnnn "is separated from the memory area used by the user by software or hardware so that access is not possible when the system is operated.

In the embodiment of the present invention, the access restriction flag setting area is not accessible during system operation (after the card issuance processing).

Here, whether the content of the data is read-only,
Alternatively, a flag for setting whether or not reading and writing are possible is assigned to bit0 to bit1.

First, the procedure for setting a read-only IC card will be described.

When the IC card is inserted into the reader / writer, the power of the IC card is turned on, communication with the reader / writer is enabled, and the ID data of the IC card is transferred to the reader / writer.
Send to writer. Note that the I card sent by the IC card
The D data is a serial number for manufacturing control at the time of manufacturing the IC chip.

Thereafter, the reader / writer sends a command for authentication to the IC card, checks the response from the IC card, determines whether the card is valid, and determines that the card is valid. In this case, an access restriction flag rewrite command and flag data are transmitted to set a flag.

In this embodiment, mutual authentication is performed to confirm whether the IC card and the reader / writer are mutually valid.

When a read-only IC card is set, bit 0 is set to "0" and all other bits 1 to 7 are set to "1".

After setting bit0 to "0", the data to be read was written to the memory, and the processing was performed in a software manner so that once the writing was completed, the second and subsequent writings could not be performed.

The content of the processing is a bit at the address "nnnn".
7 is assigned as a flag indicating that the access setting process has been completed. If this flag (bit) is "0", it is regarded that the setting has been completed, and the software "nnnnn" will not be accessible any more. Processing was performed.

The above processing is performed by using the read-only I
The flowchart for setting the access restriction flag of the C card is shown in FIG.

Next, a readable and writable IC
The procedure for setting the card will be described.

When the IC card is inserted into the reader / writer, the power of the IC card is turned on, communication with the reader / writer is enabled, and the ID data of the IC card is transferred to the reader / writer.
Send to writer.

After that, the reader / writer sends a command for authentication to the IC card, checks the response from the IC card, determines whether the card is valid, and determines that the card is valid. In this case, an access restriction flag rewrite command and flag data are transmitted to set a flag.

In the present embodiment, the IC card and the reader / writer perform mutual authentication in order to confirm whether they are valid or not.

At this time, the read and write I
When setting to the C card, bit1 is set to "0", and the other bit0 and bit2 to bit7 are all set to "1".

After setting bit1 to "0", "nn"
The bit 7 at the address “nn” is assigned as a flag indicating that the access setting process has been completed, and this flag (bit)
Is set to "0", it is regarded that the setting has been completed, and a software process is performed so that the address "nnnnn" cannot be accessed thereafter.

The above processing contents are shown in the flowchart for setting the access restriction flag of the readable and writable IC card in FIG.

In this embodiment, the setting of the read-only IC card and the setting of the readable and writable IC card are performed by allocating each bit in one address as a flag. If an access restriction flag is provided for each area of 10 bytes, it is possible to set a read-only area and a read / write area in one IC card.

[0032]

As described above, according to the present invention, an access restriction flag for reading and writing is provided in a part of the memory of the IC card, authentication is performed when the IC card is issued, and after the validity is confirmed. By setting a flag and setting an access restriction flag for a read-only IC card or a readable and writable IC card, data can be stored in one IC chip without developing a dedicated IC chip. It is possible to provide two types of IC cards that are readable only and readable and writable, and a method of using the same.

[Brief description of the drawings]

FIG. 1 is a diagram showing a memory map of an IC card according to an embodiment of the present invention.

FIG. 2 is a diagram showing an access restriction flag setting procedure according to the embodiment of the present invention.

FIG. 3 is a read-only IC according to the embodiment of the present invention;
The figure which shows the setting flowchart of the access restriction flag of a card.

FIG. 4 is a diagram showing a flowchart for setting an access restriction flag of a readable and writable IC card according to the embodiment of the present invention.

Claims (4)

[Claims] An IC card characterized in that a part of a memory of an IC chip is provided with a flag for restricting access for reading and writing. 2. A read / write access restriction flag is provided in a part of a memory of an IC chip,
When an IC card is issued, a read-only or read-write IC card is authenticated, and after confirming its validity, read-only or read-write and write-enable.
I. An access control flag is set.
How to use C card. 3. The IC card according to claim 1, wherein an access restriction flag for a read-only IC card or a readable / writable IC card is set by software after authentication. How to use 4. The IC card according to claim 1, wherein a flag for restricting access to a read-only IC card or a readable / writable IC card is executed by hardware after authentication. How to use