JP2547795B2 - Portable electronic devices - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial field of application) The present invention relates to an IC card (portable electronic device) that receives command data input from, for example, a card reader / writer (first electronic device). Received, the function code included in the above instruction data is decoded, a series of processes corresponding to this is executed, and then the processing result is output as response data to the card reader / writer, particularly the card reader / writer. The present invention relates to a processing method capable of prompting an IC card to resend a response data from a writer.

(Prior Art) Recently, as a new portable data storage medium, an IC card having a built-in IC chip having a nonvolatile data memory and a control element such as a CPU (Central Processing Unit) has been developed. This type of IC card is normally operated by using a card reader / writer, and command data is generally used during the operation. The IC card decodes the function code in the received instruction data, executes a series of processes corresponding to the function code, and outputs the process result to the card reader / writer as response data. That is, one response data is output for one command data. In this case, for example, if the communication path between the card reader / writer and the IC card is abnormal and the card reader / writer cannot receive the response data from the IC card correctly, the card reader / writer will A response data resend request is issued.
At this time, if the resend request command data from the card reader / writer becomes abnormal and the ID card cannot normally receive the resend request command data, the IC card notifies the card reader / writer of that fact as response data. There must be. However, if there is a single output buffer for data output of the IC card, if the output buffer is used for this notification, even if the resend request command data is normally received after that, the above notification data will be sent to the output buffer. However, the response data requested by the card reader / writer for resending is destroyed. In this case, not only the normally requested response data cannot be retransmitted to the card reader / writer, but also the subsequent sequence with the card reader / writer is disturbed.

(Problems to be Solved by the Invention) In the present invention, as described above, the retransmission request command data from the first electronic device is abnormal, and the second electronic device cannot normally receive the retransmission request command data. In order to solve the problem in the case of, the second electronic device receives the normal resend request command data even after the resend request command data from the first electronic device becomes abnormal. It is an object of the present invention to provide a processing method in which response data that is normally requested can be retransmitted to a first electronic device and a sequence disorder between the first electronic device and the second electronic device does not occur.

[Structure of Invention]

(Means for Solving Problems) The present invention receives command data and resend request command data input from a first electronic device, and receives response data as the first response data.
In the portable electronic device for outputting to the electronic device, the identification means for identifying whether the command data received from the first electronic device is a resend request command of the processing result or command data other than the resend request, As a result of the identification by the identification means, in the case of command data other than the resend request, processing means for performing processing corresponding to this command data, and a processing result of the command by this processing means are set, and this data is used as response data. When the command data received from the first electronic device as a result of identification by the first output buffer for outputting to the electronic device and the identification unit is a resend request command of the processing result, the processing result by the processing unit is A second output buffer which is set and outputs this data as response data to the first electronic device is provided.

(Operation) The output buffer can be switched by the portable electronic device itself according to the type of command data from the first electronic device.
For example, the second output buffer is used when the response data for the resend request command data is notified, and the first output buffer is used for the other notifications. Thereby, for example, even after the abnormality has occurred in the resend request command data from the first electronic device, the second electronic device receives the normal resend request command data, so that the response data normally requested by the first electronic device can be transmitted. It can be retransmitted to the electronic device, and the sequence disorder between the first electronic device and the second electronic device does not occur.

(Example) Hereinafter, one example of the present invention will be described with reference to the drawings.

FIG. 10 shows a configuration example of a card handling device to which the IC card according to the portable electronic device of the present invention is applied, which is used as a terminal device such as a home banking system or a shopping system. That is, this device enables the IC card 1 to be connected to a control unit 3 including a CPU via a card reader / writer 2 as a card processing device, and the control unit 3 includes a keyboard 4, a CRT display device 5, and a printer. 6 and the floppy disk device 7 are connected.

The IC card 1 is held by the user and refers to a personal identification number known only to the user, for example, when the user purchases a product, or stores necessary data. The function block is shown in FIG. In addition, it is composed of a portion for executing basic functions such as a read / write unit 11, a password setting / password collating unit 12, and an encryption / decryption unit 13, and a supervisor 1 for managing these basic functions. Read / write section 11
Reads and writes data to and from the data memory 16,
Alternatively, it is a function of erasing. The password setting / password collating unit 12 has a function of storing and reading out the password set by the user, verifying the password after setting the password, and permitting subsequent processing. The encryption / decryption unit 13 is used to prevent communication data from leaking or forgering when transmitting data from the control unit 3 to another terminal device via a communication circuit. Decryption is performed, for example
This function performs data processing according to an encryption algorithm having sufficient encryption strength such as DES (Data Encryption Standard). The supervisor 14 is a function that decodes the function code or the function code added with data input from the card reader / writer 2 and selects and executes a necessary function from the basic functions.

In order to exert these various functions, the IC card 1 has a control element (for example, CPU) 1 as shown in FIG.
5, non-volatile data memory 16 that can erase the stored contents,
It is configured by a program memory 17 and a contact portion 18 for making electrical contact with the card reader / writer 2, and a portion within these broken lines (control element 15,
The data memory 16 and the program memory 17) are composed of one IC chip. Here, the control element 15 includes at least two or more output buffers for outputting data, such as the first buffer.
Output buffer 19 and a second output buffer 20. The program memory 17 is composed of, for example, a mask ROM, and stores a control program of the control element 15 including a subroutine that realizes each of the basic functions. The data memory 16 is used for storing various data,
For example, it consists of EEPROM.

The card reader / writer 2 exchanges function codes and data between the IC card 1 and the control unit 3,
It also has a function of performing a one-instruction-one response operation to the IC card 1 based on a macro instruction from the control unit 3. Specifically, as shown in FIG. 9, a transport mechanism 21 for transporting the IC card 1 inserted into a card insertion slot (not shown) to a predetermined position, and a contact portion 18 of the IC card 1 set at the predetermined position. A contact portion 22 electrically connected to the control circuit 23, a control circuit 23 including a CPU for controlling the entire control, and an input / output interface for exchanging command data and response data between the control circuit 23 and the control portion 3. It is composed of a circuit 24, a data memory 25 for storing data, and the like.

Next, the operation in such a configuration will be described. First, the card reader / writer 2 operates according to the flow chart shown in FIG. That is, in the steady state, it is in a state of waiting for command data from the control unit 3.
When command data is input from the control unit 3, the control circuit 23
Whether or not the IC card 1 is being executed is checked, and if it is being executed, response data indicating a multiple command data error is output to the control unit 3, and the process returns to the command data waiting state.
When the IC card 1 is not being executed, the control circuit 23 outputs command data to the IC card 1 and waits for response data from the IC card 1. When there is response data from the IC card 1, the control circuit 23 outputs the response data to the control unit 3 and returns to the command data waiting state again.

The command data output from the card reader / writer 2 to the IC card 1 is, for example, a format as shown in FIG. 4, and as shown in FIG. Alternatively, there is a form in which data is added to the serial number information and the function code as shown in FIG.

The IC card 1 operates according to the flow chart shown in FIG. That is, in the steady state, it is in a state of waiting for command data from the card reader / writer 2.
When the command data is input from the card reader / writer 2, the control element 15 determines whether or not the input command data resend request command data. If it is not the resend request command data, the control element 15 determines the normality of the command data, and if it is determined to be normal, it executes the process based on the input command data, and returns the response data indicating the process result as the first item.
Set to output buffer 19 of. If it is determined to be abnormal, the response data indicating a message error is set in the first output buffer. Then, the control element 15 outputs the contents of the first output buffer 19 to the card reader / writer 2 and returns to the instruction data waiting state. The response data in this case is, for example, a format as shown in FIG. 2, and the serial number information and the function code added to the input instruction data are added to the information indicating the processing result, and the card reader / writer is added. Take protective measures in case the sequence between 2 and is disturbed.

When the input command data is a resend request command, the control element 15 determines the normality of the command data. If the message is not normal, the control element 15 will output the second output buffer 19
Set the response data that means an abnormal message to
The contents of the output buffer 19 are output to the card reader / writer 2 to return to the instruction data waiting state. If the message is normal, the control element 15 sets the second output buffer 20 to the response data contained in the first buffer, and the second output buffer 20
The contents of the output buffer 20 of are output to the card reader / writer 2, and the state returns to the instruction data waiting state again.

That is, there are two output buffers in the IC card 1, and when it is determined that the command data is the resend request command data, the second output buffer 20 is used, and the other output such as the processing result is the first. The output buffer 19 of is used. This means that if there is only one output buffer,
If it is judged that the resend request command data is a message error, the judgment result will be stored in this output buffer and then the content will be output.After that, if the resend request command data is normally received, the previous output will be displayed in the output buffer. This is because only the response data indicating the abnormal message is stored, so that the content of the resend data requested by the card reader / writer 2 is destroyed. In this case, the subsequent sequence is disturbed.

Next, a specific operation of the card reader / writer 2 will be described with reference to the flow chart shown in FIG. First, the control circuit 23 initializes the serial number information and then waits for command data from the control unit 3. At this time, when command data is input from the control unit 3, the control circuit 23 confirms whether or not the IC card 1 is under execution, and if it is under execution, response data indicating a multiple command data error. Is output to the control unit 3, and the state returns to the instruction data waiting state. When the IC card 1 is not being executed, the control circuit 23 adds serial number information, outputs command data to the IC card 1, and waits for the response data from the IC card 1. At this time, if the response data is not received before the predetermined time-out value is exceeded, the IC card 1 is prompted to resend. At this time, the control circuit 23 counts up the retransmission request counter to make a retransmission request a predetermined number of times, and when the number of times is reached, outputs response data indicating a time-out to the control unit 3 and again outputs the command data. Return to the waiting state.

When the response data from the IC card 1 is received, the control circuit
23 determines whether or not the response data is for the resend request, and if it is for the resend request, the process moves to (a) of FIG. If it is not a retransmission request, the control circuit 23 clears the retransmission request counter and determines whether the instruction data from the control unit 3 is a macro instruction. If it is a macro command, the serial number information in the response data from the IC card 1 is counted up and added to the command data to be transmitted next time. When the macro command is completed, the response data is output to the control unit 3 and the command data waiting state is returned again. If it is not a macro command, the response data is immediately output to the control unit 3, and the process returns to the command data waiting state again.

FIG. 6 shows a specific transmission procedure of the card reader / writer 2 with the IC card 1, and shows a specific sequence when, for example, the command data of the function code (A) is output twice in succession. Regarding the command data for the first transmission, the serial number information is "1", and the serial number information of the response data at this time is also "1". Next, it is assumed that the command data for the second transmission is not recognized by the IC card 1. At this time, since the response data is not output, the card reader / writer 2 makes a retransmission request as the third transmission. The serial number information at this time is "3". At this time, when the IC card 1 receives the resend-request command data and determines that the message is abnormal, it outputs it as response data. When the card reader / writer 2 receives the card, the card reader / writer 2 requests the retransmission again as the fourth transmission. The serial number information at this time is "4". When the IC card 1 receives this normally, it outputs the response data for the first transmission. When the card reader / writer 2 receives this, the card reader / writer 2 counts up the serial number information "1" added thereto and adds it at the time of the fifth transmission.

In this way, the IC card is provided with two output buffers, and the second output buffer is used for notification of a resend request command data abnormality, and the first output buffer is used for other notifications. By doing so, even if the resend request command data from the card reader / writer becomes abnormal, the IC card receives the normal resend request command data and resends the normally requested response data to the card reader / writer. Yes, card reader / writer and IC
The sequence is not disturbed with the card.

In the above embodiment, the card reader / writer 2 is used as the first electronic device and the IC card 1 is used as the portable electronic device. For example, the first electronic device is used as the control unit 3 and the portable electronic device is used. The device may be the card reader / writer 2.
In short, the portable electronic device receives the command data input from the first electronic device, decodes the function code included in the command data, executes a series of processes corresponding thereto, and then returns the processing result. Any processing method that outputs as data to the first electronic device can be applied.

〔The invention's effect〕

As described in detail above, according to the present invention, even after the abnormality has occurred in the retransmission request command data from the first electronic device,
When the portable electronic device receives the normal resend-request command data, the normally requested response data can be resent to the first electronic device, and the sequence disorder between the first electronic device and the portable electronic device occurs. A processing method that does not occur can be provided.

[Brief description of drawings]

The drawings are for explaining one embodiment of the present invention. FIG. 1 is a flow chart for explaining the operation of an IC card, and FIG.
FIG. 3 is a diagram showing the format of response data output from the IC card, FIG. 3 is a flow chart explaining the operation of the card reader / writer, and FIG. 4 is a diagram showing the format of command data output from the card reader / writer. FIG. 5 is a flow chart for explaining the concrete operation of the card reader / writer, FIG. 6 is a diagram showing a concrete transmission procedure between the card reader / writer and the IC card, and FIG. 7 is built in the IC card. Block diagram showing the configuration of the IC chip, FIG. 8 is a diagram showing possible blocks of the IC card, FIG. 9 is a block diagram showing the configuration of the card reader / writer, and FIG. 10 is a block diagram showing the configuration of the card handling device. Is. 1 ... IC card (second electronic device), 2 ... Card reader / writer (first electronic device), 15 ... Control element (CP)
U), 16 …… Data memory, 17 …… Program memory, 1
9,20 …… Output buffer, 23 …… Control circuit.

Claims (1)

(57) [Claims] 1. Command data and resend request command data input from a first electronic device are received, and response data is received by the first electronic device.
In the portable electronic device for outputting to the electronic device, the identification means for identifying whether the command data received from the first electronic device is a resend request command of the processing result or command data other than the resend request, As a result of the identification by the identification means, in the case of command data other than the resend request, processing means for carrying out processing corresponding to this command data, and a processing result of the command by this processing means are set, and this data is used as response data. A first output buffer for outputting to an electronic device; and, when the instruction data received from the first electronic device as a result of identification by the identification means is a resend request instruction of the processing result, the processing result by the processing means is A second output buffer which is set and outputs this data as response data to the first electronic device. Child device.