JPS63123184A - Ic card - Google Patents

Abstract

PURPOSE:To limit the number of times using data by permitting a counter to count accesses to data stored in an IC card and deleting the data when the number of calculations reaches a specific number set to the counter. CONSTITUTION:A numeric value to be stored in the access counter is accepted, and stored in the access counter 422. It is a subtraction counter, and accesses a data storage part 423 by an initially set number. Next data to be stored in the data storage part 423 is accepted and stored in the part 423. When a data read command is inputted, the reading of the access counter is judged to be below zero or not. If so, the data stored in the data storage part 423 is deleted because is cannot be used.

Description

DETAILED DESCRIPTION OF THE INVENTION +a) Industrial Application Field This invention relates to an IC card that automatically erases data when it is accessed a specific number of times.

1) Conventional technology IC cards contain data and programs (hereinafter simply r data 1)
That's what it means. The same applies within the scope of the claims.

) has been proposed, which stores the information and lends it to users.

(C) Problem to be solved by the invention When a conventional IC card is used in such a rental system, the rented data can be accessed at any time and will not be erased unless it is manually erased. . For this reason, in conventional rental operations, it was essential to return the IC card. If the return is delayed, the data may be used beyond the lending period, which impairs the smoothness of transactions.

The present invention has been made in view of these drawbacks, and an object of the present invention is to provide an IC card that can automatically erase stored contents when data is accessed a specific number of times.

(d) Means for solving the problem This invention provides an input means for storing input data;
The present invention is characterized in that it includes a counter that stores the number of times this data has been accessed, and erasing means that erases the memory contents of the storage means when the counter counts a specific number of times.

(61 Effect) In the IC card of the present invention, after data is stored in the storage means, the number of accesses is counted by a counter every time this data is accessed. The contents are erased by the erasing means, that is, the number of times the data is used (accessed) is limited.

(f) Embodiment FIG. 1 is an external view of an IC card which is an embodiment of the present invention. The surface of the IC card 1 has a connection terminal 2 for exchanging data with an external device. A keypad section 3 including a numeric keypad is provided, and LS! inside the card. 4 is provided.

21 is a block diagram of the IC card.

The LSI 4 provided in the IC card 1 includes a microprocessor unit (MPU) 41. an interface 43 connected to the nonvolatile memory 42 and the connection terminal 2;
is built-in, and the MPU 41 is connected to the key human power section 3. EEPROM is used as the nonvolatile memory 42.

FIG. 3 is a partial configuration diagram of the nonvolatile memory 42. As shown in FIG.

This non-volatile memory 42 has a PIN code storage area 42.
1. Access counter 422 and data storage unit 423
is set. The access counter 423 may be an addition counter or a subtraction counter.

FIG. 4 is a flowchart showing the operation of the control section when the IC card is inserted into an external device (hereinafter referred to as "device"). When power is supplied and the operation starts, first, in step nl (hereinafter step ni will be referred to as ni), the state of the memory etc. is initialized. It is determined at n3 whether the PIN code has been registered or not, and if it has not been registered (if this is the first use of this card), the process proceeds to n4. If the password has already been registered, proceed to n7.

n4 sends a message requesting password registration to the device, and
Step 5 to receive the PIN code. The input code is stored in the code storage area (421) and n1fl
Proceed to.

n7 sends a message requesting the input of the PIN code to the device, and
Receive the pin code entered in step 8.

Use n9 to determine whether the entered pin codes match or not. If they match, proceed to nlo; if they do not match, proceed to nlo.
Return to 7.

nlo waits until a command is received from the device. When a command is input, n1). The content of the command is determined in n12. If it is a data retrieval command (command to read data stored in data storage m (423)), proceed to n18 with a nil determination, and proceed to n18 with an access counter set command (access counter (422) and data storage! ()). 423)), the process proceeds to n13 based on the judgment at n12. If any other command is input, it is assumed that the command is incorrect and an error message is sent to the device (n17), and the process returns to nlO.

First, the operation when an access counter set command is input will be explained. At n13, the input of the value to be stored in the access counter is accepted, and the input value is stored in the access counter (422) (n14). This access counter (422) then accepts input of data to be stored in the data storage section (423) (n15), and stores the input data in the data storage section (423). Store (n16) and return to nlO.

Next, the operation when a data read command is input will be explained. When a data read command is input, it is determined whether the access counter (422) is less than or equal to θ. If it is less than θ, the data stored in the data storage section 423 is unusable, so this data is erased (n20) and the process proceeds to step 19. If the access counter is not O, access is possible, so n19
Proceed to and send the data to the device (n19), then
Return to

The operation ends when the IC card is removed from the device.

FIG. 5 is a flowchart showing the operation of the IC card issuing device that stores data in the IC card. When the IC card is inserted into the IC card reader/writer, this I
It supplies power to the C card (n21) and receives commands sent from the IC card (n22). The command sent is a password input request or password registration request. That is, when a new IC card is inserted, a password registration request is sent, and when a previously used IC card is inserted, a password input request is sent because the password has already been registered. n23 and n
The transmitted command is determined in step 28, and if it is a password code input request, the process proceeds to n24 based on the determination in n23, and if it is a password code registration request, the process proceeds to n29 based on the determination in n2B. If any other command is sent, an error message will be sent as an inappropriate IC card has been inserted.n31), n
Proceed to step 36.

The n29 accepts input of the PIN code manually using the key, and sends the entered PIN code to the IC card (n3
0). After this, proceed to n32.

At n24, the input of the PIN code is accepted, and the input PIN code is sent to the IC card (n25). At n26, a message indicating the verification result of the PIN code is received from the IC card, and if the PIN codes match, the process proceeds to n32, and if they do not match, the process returns to n24.

n32 sends an access counter set command,
At n33, input of the access counter value manually is accepted. The input numerical value is transmitted to the IC card (n34), and the data to be stored in the IC card (this data has been input by a method other than manual input) is transmitted to the IC card (n35). Thereafter, the power supply to the IC card is stopped (n36) and the operation is completed.

FIG. 6 is a flowchart showing the operation of a control section of a data reading device (game device, etc.) that accepts the IC card and uses the data.

The n37 supplies power to the inserted IC card and
Receive messages sent from the card. If the received message requests the input of a PIN code, n41 is determined by n39.
If any other message is received, it is determined that the IC card is a different IC card, and an error message is sent at n40, and the process proceeds to n48.

n41 accepts password input manually using the key.
Send the manually entered PIN code to the IC card (n42
). At n43, a message indicating the pin code verification result is received from the IC card, and if they match, the process proceeds to n45 based on the judgment at n44, and if they do not match, the process returns to n41.

At n45, a data read command for reading data stored in the IC card is transmitted, and data sent from the IC card is received (n46). n47
Then, the process corresponding to the data is performed, and the power supply to the IC card is stopped (n48) to end the operation.

The n1B and n20 correspond to the erasing means of the present invention.

(S) Effects of the invention According to the invention, a counter counts the number of accesses to data stored in an IC card, and the data is erased when a specific number of times set in the counter is counted. This allows you to limit the number of times the data can be used.

As a result, when data is used for rental business, the number of accesses can be limited by setting the number of times the data can be accessed as a specific number of times, and there is no need to request the return of the IC card.
Benefits arise that lead to simplification of operations.

[Brief explanation of the drawing]

1 and 2 are an external view and a block diagram of the control section of an IC card according to an embodiment of the present invention, and FIG. 3 is a block diagram of the
FIG. 4 is a partial configuration diagram of the memory of the C card.
5 is a flowchart showing the operation of the control section of the card. FIG. 5 is a flowchart showing the operation of the IC card issuing device in which the IC card is inserted and data etc. are stored;
FIG. 4 is a flowchart showing the operation of the data reading device in which the IC card is inserted and its data is used.
22-Access counter.

Claims (1)

[Claims] (1) A storage means for storing input data, a counter for storing the number of times this data has been accessed, and an erasing means for erasing the memory contents of the storage means when the counter has counted a specific number of times. An IC card that is characterized by