JPH0850642A - Ic card - Google Patents

Abstract

PURPOSE:To provide an IC card capable of making a card owner able to read and write data and surely managing the data by reading and writing the data only by a system provider. CONSTITUTION:This card is provided with an order code decoder 15 for outputting read signals or write signals to a memory 19 and also outputting comparison signals to a password comparison means 21, an address decoder 17, the memory 19 for which data are inputted and outputted through a gate circuit 29, a first area discrimination means 23 for detecting that the value of address signals outputted by the address decoder 17 is within a specified range and a third area discrimination means 25 for detecting that the address signal is in a different specified range. The password comparison means 21 detects the matching of the data from an input/output device 13 and a password and a control circuit 27 for turning the gate circuit 29 to a conductive state by signals from the first area discrimination means 23, the third area discrimination means 25 and the password comparison means 21 is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small card containing an integrated circuit.

[0002]

2. Description of the Related Art Today, a card type memory device called an IC card having an integrated circuit built-in has been widely used instead of a conventional magnetic card. This IC card is, for example, a synthetic resin plate having a thickness of 0.76 mm, a length of 85.5 mm and a width of 54 mm, and a central processing unit called CPU and a memory such as an EPROM. Have a part of
Connected to an input / output terminal such as a card reader through 6 to 8 terminals provided on the surface of the card, and by exchanging data between the CPU incorporated in this card and the central processing unit provided in the card reader. The data in the memory built in the card is updated and predetermined data is stored in the IC card.

[0003]

As described above, the CPU
The IC card with a built-in card is provided with a code that restricts data rewriting, etc., and personal data regarding the card owner can be stored while preventing inadvertent tampering of the data, but the manufacturing price is still high, and In general, the recitation code is generally complicated so that the user cannot freely rewrite the data, and although the stored data is the cardholder's personal data, it is usually the cardholder. Was unable to write data, limiting the range of use of the IC card.

The present invention makes it possible to store the data required by the system provider and easily expand the range of use of the IC card as an IC card in which the card holder can write and read the data. It is a thing.

[0005]

According to the present invention, there is provided a first area in which data cannot be directly read or written from the outside, and a second area in which data can be read or written from the outside by a password. The IC card has a built-in memory having a third area that allows data to be freely read and written from the outside.

This IC card has an order code decoder, an address decoder and a password comparing means connected to an input / output device, and a memory connected to the input / output device through a gate circuit. The read signal or the write signal is output to the memory based on the data input through the output device, and the comparator signal is output to the password comparison means depending on the data from the input / output device. An address signal indicating a predetermined address of the memory is output based on the data input from the input / output device, and further, a code area flag is output when the value of the address signal output by the address decoder is in a specific range. 1 area discrimination means and the value of the address signal output from the address decoder And a third area discriminating means for outputting a user's flag in a specific range, and the password comparing means outputs a password flag when the data from the input / output device matches the data from the memory. A control circuit is provided which outputs an access signal for turning on the gate circuit when the user's flag is input and when the password flag is input without inputting the code area flag.

[0007]

The present invention has the first aspect in which reading / writing from the outside is impossible.
Since the area is provided in the memory, it is possible to store the password code and other control codes while preventing the code contents from being deciphered.
Since the area is provided, the IC card can be written by only a specific person, and the third area, which is free to read and write, is provided so that the cardholder can freely use the reader / writer to write the data. It can be written and read.

An IC card having an order code decoder, a password comparing means, a first area determining means, a third area determining means, a control circuit, a gate circuit, etc., sets the memory in a read state or a write state by the order code decoder. The address decoder can write data to or read data from a predetermined address in the memory, and since the gate circuit is provided between the memory and the input / output device, the gate circuit must be closed. An input / output device, that is, a first area discriminating means capable of prohibiting the writing and reading of data from the outside of the card to the memory and outputting the code area flag when the value of the address signal output by the address decoder is within a specific range. Since the address decoder is provided, the address decoder indicates the address of the first area. When the address signal is output, the first area discrimination means can detect that the address decoder has output the address signal indicating the address of the first area, and when the value of the address signal is in another specific range. Since the third area discriminating means for outputting the user's flag is provided in, the address decoder outputs the address of the third area by the third area discriminating means when the address decoder outputs the address signal indicating the address of the third area. It can be detected that the address signal shown is output.

Further, since the control circuit for outputting the access signal for turning on the gate circuit when the user's flag is input is provided, when the address decoder outputs the address signal indicating the address of the third area, The memory and the input / output device can be connected to enable writing to the memory and reading from the memory, and this control circuit outputs an access signal when the password flag is input without inputting the code area flag. Because it outputs, the third
When an address signal indicating an address other than the area is output from the address decoder, reading / writing from the outside can be prohibited unless the password flag is output from the password comparison means, and even if the password flag is output, the address signal is output. Specifies the address of the first area, the output of the access signal from the control circuit is stopped by the code area flag, and reading / writing from / to the memory from the outside can be prohibited.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An IC card according to an embodiment of the present invention has a circuit configuration shown in FIG. That is, of the plurality of contacts provided on the surface of the card, an input / output device 13 that is connected to the data contact 11 to input data from the data contact 11 and outputs data to the data contact 11, and this input / output device E connected via an order code decoder 15 and an address decoder 17 connected to 13 and a password comparison means 21, and a gate circuit 29 using two AND circuits.
A memory 19 such as an EPROM is provided, and an order code decoder is provided.
The read signal output terminal of 15 is the read terminal of the memory 19, and the write signal output terminal of the order code decoder 15 is the memory 19.
Of the order code decoder 15 is connected to the control terminal of the password comparison means 21. The second input terminal of the password comparison means 21 is connected to the data output terminal of the memory 19, and the output terminal of the password comparison means 21 is connected to the control circuit 27 described later.

The output terminal of the address decoder 17 is connected to the address terminal of the memory 19 and also to the first area discriminating means 23 and the third area discriminating means 25. The output terminal is the negative input terminal of the AND circuit in the control circuit 27, and the third area discrimination means
The output terminal of 25 is connected to the input terminal of the OR circuit in the control circuit 27.

This control circuit 27 is composed of one two-input type AND circuit and two-input type OR circuit, and the other normal input terminal of the AND circuit is the password comparing means 21.
The output terminal of the AND circuit is connected to the gate circuit 29 via the OR circuit.
29 is composed of two AND circuits, and one input terminal of both AND circuits is connected to the output terminal of the OR circuit in the control circuit 27, and one AND circuit has an input terminal of the memory 19
, The output terminal of this AND circuit is connected to the input port of the input / output device 13, the other AND circuit is connected to the output port of the input / output device 13, and the output terminal of this AND circuit is connected. It is connected to the data input terminal of the memory 19.

Then, the order code decoder 15 is activated by a signal from a contact provided on the surface of the card,
According to the data output from the output port of the input / output device 13, a read signal or a write signal is output to the memory 19 to make the memory 19 readable or writable, and the address decoder 17 is also provided on the card surface. Memory based on the data input to the card via the input / output device 13 by operating with the signal from the contact
It outputs an address signal indicating 19 predetermined addresses.

The order code decoder 15 outputs a read signal or a write signal based on the data from the input / output device 13 and also outputs a comparator signal to the password comparison means 21 depending on the content of the data. . The password comparing means 21 holds the data from the input / output device 13 in the register, and also holds the data from the memory 19 in the register.
When the comparator signal from 15 is input, the data in both registers are compared, and if they match, an H-level password flag is output to the control circuit 27, and the output of this password flag is maintained.

Also, the first connected to the address decoder 17
The area discriminating means 23 outputs an H level code area flag when the value of the address signal output from the address decoder 17 is in the range of the specific address, and the third area discriminating means 25 outputs the address signal value in the first area. It is assumed that the H-level user's flag is output when the value is within a predetermined range different from the range determined by the determination means 23.

The control circuit 27 to which the code area flag and the user's flag are input sends the user's flag from the third area discriminating means 25 to the gate circuit 29 via the OR circuit. decoder
When 17 outputs the address signal indicating the address in the third area, the two AND circuits forming the gate circuit 29 are opened so that the data from the input / output device 13 can be written in the memory 19. At the same time, the data read from the memory 19 can be transmitted to the input / output device 13.

When the address signal from the address decoder 17 has a value indicating an address other than the third area, the third area discriminating means 25 does not output the user's flag.
27 does not output an access signal to the gate circuit 29 unless the password flag is input from the password comparison means 21, and the gate circuit 29 shuts off between the memory 19 and the input / output device 13 and must use a password. It is impossible to write data to the memory 19 or read data to the memory 19 at addresses other than the third area.

Further, even when the password data is sent from the outside and the password comparing means 21 outputs the password flag, if the address signal from the address decoder 17 has a value indicating the address of the first area, the first Since the area discriminating means 23 outputs the code area flag and the code area flag is inputted to the negative input terminal of the AND circuit in the control circuit 27, the output of this AND circuit becomes L level and the gate circuit 29 is closed. Output device 13 and memory
The transmission of data to and from 19 will be blocked.

Therefore, in this IC card, the input / output device
A third area where data can be freely read and written from outside via 13 and an area other than the third area where the memory 19 cannot be read and written unless a password is entered. Therefore, the first area in which reading and writing of data is impossible is formed. As described above, since there is a first area where data access from outside is not possible at all, if this first area is used as a code storage area and a memory 19 in which a password code and an appropriate control code are stored in advance, A code such as a password cannot be read or altered after the IC card is created, and a highly secure IC card can be provided. An area other than the first area that requires a password is the second area, If the system manager uses it as a system data area for storing data about the cardholder, the data can be read or written when the cardholder inserts the IC card into the card reader of the system manager. Similar I
Since it can be used as a C card, and the third area is an area in which reading and writing can be done freely, the cardholder can use the appropriate reader / writer to write or read data as a user's area. Become.

As described above, since the IC card according to this embodiment is provided with the third area as the user's area, the data can be read and written only by the terminal of the system administrator like the conventional IC card. Not only this, the card holder is an IC card that allows the card reader to freely read and write data, so the range of use of the IC card can be expanded, and the order code decoder 15 and address decoder can be used. 17, the first area discriminating means 23, the third area discriminating means 25, the password comparing means 21, the control circuit 27 and the like can be easily formed by a logic circuit, and are formed only by the memory 19 and circuit elements. Which can be mass-produced at low cost without requiring a built-in CPU A.

[0021]

The present invention is an IC card having a first area of the memory that cannot be externally read and written and a second area of the memory that can be read and written by a password.
Since the IC card is a highly secure IC card that also has a third area that can be freely read and written from the outside, the cardholder writes or reads data to or from the IC card with an appropriate card reader or reader / writer. It is an IC card that enables
The range of use of IC cards can be expanded and added value can be increased.

Further, in addition to the order code decoder and the address decoder, the IC card having the structure including the first area discriminating means and the third area discriminating means, the password comparing means, the control circuit and the gate circuit has the memory area as the first area. It can be easily divided into an area that can be freely read / written externally, an area that requires a password, and an area that cannot be read / written externally at all, and a CPU can be used. This has the advantage that the circuit can be configured without the need for mass production of IC cards easily and inexpensively.

[Brief description of drawings]

FIG. 1 is a diagram showing a circuit configuration example of an IC card according to the present invention.

[Explanation of symbols]

11 data contact 13 input / output device 15 order code decoder 17 address decoder 19 memory 21 password comparison means 23 first area discrimination means 25 third area discrimination means 27 control circuit 29 gate circuit

Claims (2)

[Claims] 1. A first area in which data cannot be directly read or written from the outside, a second area in which data can be read or written from the outside by a password, and any data can be freely read or written from the outside. An IC card having a built-in memory having a third area for enabling the above. 2. An order code decoder connected to an input / output device, an address decoder and a password comparison means, and a memory connected to the input / output device via a gate circuit. A decoder that outputs a read signal or a write signal to the memory based on the data input via the output device and outputs a comparator signal to the password comparison means depending on the data input via the input / output device The decoder is a decoder that outputs an address signal that points to a predetermined address of the memory based on the data input from the input / output device, and further outputs a code area flag when the value of the address signal output by the address decoder is in a specific range. And the value of the address signal output by the address decoder is And a third area discriminating means for outputting a user's flag in a specific range different from the above, and the password comparing means sets the password flag when the data from the input / output device matches the data from the memory. And a control circuit for outputting an access signal for turning on the gate circuit when the user's flag is input and when the password flag is input without inputting the code area flag. The characteristic IC card.