JP3074722B2 - IC card communication system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a communication system of an IC card having an IC card for performing data communication with a terminal processing device such as a reader / writer. The present invention relates to an IC card communication system in which an executable data processing program is stored in an IC card side, and the data processing program is executed by an IC card in accordance with an instruction from a terminal processing device.

<Conventional Technology> Conventionally, as a communication system of this type of IC card, for example, one disclosed in Japanese Patent Application Laid-Open No. 1-140276 is known.

In this IC card communication system, the card reader / writer has a communication program for the IC card in its ROM, and the CPU sequentially executes these communication programs to communicate with the host computer (upper device) and the IC card. Data communication between the two.

That is, the card reader / writer transmits a CPU used as a main control unit, a ROM storing a main program, a command transmission / reception processing program, a response transmission / reception processing program, and the like, and command data,
It comprises a serial input / output control circuit (SI / O) for receiving response data, and an internal storage device RAM.

When the card reader / writer receives, for example, response data from the host computer or the IC card, the card reader / writer determines whether or not this is response data to be transferred to the host computer or the IC card. For this reason, the card reader / writer is either a host computer or
Response data can be sent immediately to the IC card. As a result, the processing speed of long data and commands can be greatly increased.

<Problem to be Solved by the Invention> However, in such a conventional communication system of an IC card, the IC card is executed by a program other than a data communication program with the card reader / writer, for example, by a card reader / writer or a host computer. The data processing program (encryption program, sender ID search program, etc.) to be executed was not provided in the ROM.

Therefore, once the IC card sends the stored data to the card reader / writer or host computer, if they are executing a data processing program, the IC card must wait for an instruction from this card reader / writer or host computer. did not become.

As a result, there is a problem that the IC card spends a lot of useless time, and the data processing time is long in the IC card communication system.

Therefore, an object of the present invention is to provide an IC card communication system that can reduce the data processing time.

<Means for Solving the Problems> The present invention provides an IC card communication system including an IC card processing device for performing data communication with an IC card.
N executed by the IC card processing device (N is an integer of 2 or more)
M (1 ≦ m ≦ N−1 integer) data processing programs are stored in the memory of the IC card, and N−m data processing programs are stored in the memory of the IC card processing device. Then, the data processing program is executed by the IC card processing device based on the data processing program, the data processing program is executed on the IC card by an execution instruction from the IC card processing device, and the result of the execution is transmitted to the IC card processing device. This is a communication system for transmitting IC cards.

2. The communication system for an IC card according to claim 1, wherein a different data processing program can be executed by replacing an IC card for performing data communication with the IC card processing device with another IC card. It is.

The IC card communication system according to claim 1, wherein the IC card processing device can simultaneously execute different data processing programs with a plurality of IC cards.

<Operation and Effect> In the communication system of the IC card according to the present invention, the IC
The card stores in its memory a data processing program that can be executed by an IC card processing device (reader / writer, host computer, etc.). When the IC card receives the execution instruction of the data processing program from the IC card processing device, the IC card executes the data processing program and transmits the execution result to the IC card processing device.

As a result, even when the IC card processing device is executing a certain data processing program, the IC card can execute other data processing programs to be executed by the IC card processing device in parallel. Therefore, the IC card can share and execute a part of the data processing program,
This data processing time can be greatly reduced. By executing the data processing program for a plurality of IC cards simultaneously, the data processing time can be further reduced.

In addition, some of the data processing programs to be executed by the IC card
Store and hold only in the memory of the card. Therefore,
The remaining data processing program is held by the IC card processing device. As a result, the security of the entire data processing program can be improved.

Also, different data processing programs can be stored for a plurality of IC cards. As a result,
In this IC card communication system, the data processing program can be easily changed and executed simply by replacing the IC card.

<Embodiment> An embodiment of a communication system for an IC card according to the present invention will be described below with reference to FIGS.

In FIG. 1, reference numeral 11 denotes a reader / writer (terminal processing device).
And 12 and 13 indicate IC cards capable of performing data communication with the reader / writer 11, respectively.

In other words, this reader / writer 11
Data can be exchanged with 2, 13,... Based on a predetermined communication protocol, and connected to, for example, a host computer (not shown).

The reader / writer 11 includes a CPU 21, a PROM 22, a RAM 23, and a UA
RT24. These CPU21, PRO
The M22, the RAM 23, and the UART 24 are connected via a bus 25.

The CPU 21 is a central processing unit, which performs arithmetic processing and decodes and executes commands according to a program. For example, a communication program with IC cards 12 and 13,
For example, execution of a data processing program.

The PROM 22 stores, for example, a main program, a communication control program (a command reception processing program and the like), a data processing program for calculating and processing data transmitted from the IC cards 12 and 13, and the like.

The RAM 23 mainly temporarily stores data.

The UART 24 is an interface for controlling exchange of start-stop synchronous data performed between the IC cards 12 and 13 connected via the communication line 26. In the start-stop synchronization system, a transmission start character is added at the beginning of a block of data and a transmission end character is added at the end in order to transmit the data accurately, and the receiving side of this data uses these characters. The unity of data can be determined.

On the other hand, the IC cards 12 and 13 are composed of a microprocessor (CPU) 31 for controlling and calculating data transfer and the like, a PROM 32 for holding a data processing program and the like, a RAM 33 for mainly storing data, and a communication interface. A UART3
4 and has. A bus 35 connects these. The IC cards 12 and 13 perform communication with the reader / writer 11 based on a predetermined communication protocol.

Therefore, the reader / writer 11
When the IC cards 12 and 13 are requested to execute a data processing program to be executed by the CPU 21, for example, the encryption processing program, each of the CPUs 31 executes the encryption processing program in the IC cards 12 and 13. Then, the execution result is transmitted to the reader / writer 11. During the execution of the encryption processing program, the reader / writer 11 can simultaneously execute a data processing program different from the encryption processing program, for example, a sender ID search program.

FIG. 2 shows a request message block 41 transmitted from the reader / writer 11 to the IC cards 12 and 13 in the execution request of the data processing program.

The request message block 41 includes an area 42 for storing a transmission start character indicating the start of the message block,
An area 43 for storing the number of the reader / writer 11 on the transmitting side, an area 44 for storing the number of the IC card on the receiving side, an area 45 for storing the number of the processing program requested, and data used in the processing program. An area 46 for storing the message and an area 47 for storing a transmission end character indicating the end of the message block are provided.

Hereinafter, the operation of the IC card according to this embodiment in the communication system will be described with reference to the flowcharts of FIGS. 3 (A) and 3 (B).

As shown in FIG. 3A, in the reader / writer 11, after the plurality of IC cards 12 and 13 are inserted into the card insertion slots, the CPU 21 sends an ATR (Answer) from these IC cards 12 and 13 respectively. Based on the information, it is determined which data processing program requests each of the IC cards 12 and 13.

In this embodiment, the reader / writer 11 executes the data processing programs (1), (3) and (4), and the IC card 12 executes the data processing program (2), for example, the encryption processing program at the request of the reader / writer 11. Shall be executed.

In the reader / writer 11, after the CPU 21 executes the data processing program (1) (step S11), the request message block 41 described above is created and output to the IC card 12 (S12).

Then, after that, the reader / writer 11
The CPU 21 executes the data processing programs (3) and (4) sequentially until an interrupt signal is received from S12 (S13, S1).
Four).

On the other hand, as shown in FIG.
The CPU 31 determines whether the request message block 41 has been received (S21).

If the result of the determination is NO, the request message block 41 has not been received yet, and step S21 is repeatedly executed until the request message block 41 is received.

If the decision result in the step S21 is YES, since the IC card 12 has received the request message block 41, the IC card 12 searches the IC card number stored in the area 44 of the request message block 41, It is determined whether or not (S22).

If the determination result is NO, the request message block 41 is not addressed to itself, and the process returns to step S21 to wait for transmission of the next request message block 41.

If the decision result in the step S22 is YES, the request message block 41 is addressed to itself, so the request message block
The processing program number stored in the area 45 of 41 is searched (S23), and the searched data processing program is executed. Here, the data processing program (2) is executed (S24).

Next, the IC card 12 transmits the execution result of the data processing program to the reader / writer 11 (S25).

Then, the process returns to step S21 to wait for transmission of the next request message block 41.

 The transmitted execution result is temporarily put on the stack.

 FIG. 4 shows an interrupt routine in the CPU 21.

In the reader / writer 11, when the CPU 21 receives the execution result from the IC card 12, the CPU 21 stops the program being executed based on the interrupt signal (S25) from the UART 24, and executes this interrupt routine.

That is, the used variables of the stopped program are saved on the stack (S41), and the execution result from the IC card 12 is expanded from the stack to the internal RAM of the reception buffer (S42).
Then, the program counter of the suspended program is set again (S43), the interrupt routine is bypassed, and the execution of the original program is resumed.

As described above, in the IC card communication system according to this embodiment, when the IC cards 12 and 13 receive the process execution command from the reader / writer 11,
The CPU 21 executes a data processing program executed by the CPU 21 and transmits the execution result to the reader / writer 11.

As a result, since the IC cards 12 and 13 can execute the data processing program to be executed by the reader / writer 11 during the instruction waiting time, the processing time by the data processing program can be shortened as a whole.

FIG. 5 is a timing chart showing a CPU cycle in this case.

FIG. 5A shows a case of a conventional system in which a CPU of a reader / writer executes, for example, data processing programs (1), (2), (3), and (4) in order.

On the other hand, FIGS. 5B and 5C show the relationship between the data processing program executed by the CPU 21 of the reader / writer 11 and the data processing program executed by the CPU 31 of the IC card 12, respectively. .

That is, the data processing programs (1), (3) and (4) are executed by the CPU 21, while the data processing program (2) is executed by the CPU 31. According to this, the data processing programs (1) to (4) to be executed are shared by the two CPUs 21 and 31, and are executed simultaneously.
As a whole, the time required for executing the data processing program can be reduced.

Further, the data processing program can be subdivided and executed by the CPUs of a plurality of IC cards to further reduce the execution time.

Further, in the above embodiment, a plurality of
Since the IC cards 12, 13,... Are connected in parallel, even if the connection with some IC cards becomes defective, the connection between other IC cards and the reader / writer is not impaired.

In the communication system of the IC card of the present invention, the problem that the hardware form on the reader / writer side is based on the substrate, and the software cannot be easily changed or updated, which is caused by each IC card 12, 13 each PROM32
Another advantage is that various data processing programs can be stored in the IC card, and these IC cards can be replaced in various ways to solve the problem.

In addition, the reader / writer software could be analyzed relatively easily by a third party.
By storing the information in the PROM of the IC card, there is also an effect that high security can be maintained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of an IC card communication system according to one embodiment of the present invention, FIG. 2 is a block diagram showing a data format of a request message block according to one embodiment, and FIG. 4A and 4B are flowcharts showing the operation sequence of the communication system of the IC card according to one embodiment, FIG. 4 is a flowchart showing an interrupt routine according to one embodiment, and FIGS. (C) is a timing chart for explaining a CPU cycle according to one embodiment. 11… Reader writer, 12, 13… IC card, 21… CPU, 22… PROM, 31… CPU, 32… PROM.

────────────────────────────────────────────────── (5) References JP-A-4-127369 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G06K 17/00

Claims (3)

(57) [Claims] In a communication system of an IC card having an IC card processing device for performing data communication with an IC card, N (N is an integer of 2 or more) executed by the IC card processing device.
M (1 ≦ m ≦ N−1 integer) data processing programs are stored in the memory of the IC card, and N−m data processing programs are stored in the memory of the IC card processing device. Then, the data processing program is executed by the IC card processing device based on the data processing program, the data processing program is executed on the IC card by an execution instruction from the IC card processing device, and the result of the execution is transmitted to the IC card processing device. A communication system for transmitting IC cards. 2. Performing data communication with the IC card processing device.
2. The IC card communication system according to claim 1, wherein a different data processing program can be executed by exchanging the IC card with another IC card. 3. The IC card communication system according to claim 1, wherein the IC card processing device can simultaneously execute different data processing programs with a plurality of IC cards.