JP2560549B2 - IC card - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an IC card, in which the IC card holds connection information for combining some of the data elements held in a memory, and this connection is performed by one command input from a reader / writer. By designating the information, it is possible to read out a plurality of data elements combined by the combination information.

[0002]

2. Description of the Related Art The following IC cards are known as conventional IC cards.

For example, when an IC card that internally expresses and manages user data as a record is incorporated into a system, connection between the user and the system, or data change or update can be performed smoothly and easily. This system is designed as a record / one field.

However, when the above-described design method is applied to an application that refers to a large number of types and a large amount of data, a large number of commands from the external terminal device and their responses are generated. Therefore, there is a problem that the throughput of the entire processing system is reduced.

As means for solving such a problem, there is one disclosed in the specification of Japanese Patent Application No. 2-41631 by the applicant of the present application. That is, the entire contents of the file are read by one command.

That is, the IC card adds an identification code to the read response and continuously transmits the data from the memory to the reader / writer. On the other hand, the reader / writer
When the identification code is received and detected, this transmission data is continuously received.

[0007]

However, such a conventional IC card has the following drawbacks because it outputs even data that is not required by the application side. That is, since a large amount of unnecessary data is included in the response to the read command, the redundancy of communication is increased. There is also a problem that the security is low because the unnecessary data includes data that should not be read.

[0008] Therefore, an object of the present invention is to provide an IC card in which a means for specifying and selecting a record required on the application side is mounted on the IC card to improve communication efficiency.

[0009]

The present invention, as shown in FIG. 1, includes at least a CPU and data by intervening the CPU.
Equipped with a writable and readable memory of
In an IC card connected to an external terminal device, a data element holding unit 100 that holds a plurality of data elements of a certain size in the memory, and any of these plurality of data elements It generates binding information to bind the data elements, the join information generating means 200 for holding on the memory, when receiving the read command from the external terminal device, said binding information from the data element holding means 100 a plurality of data relevant pixel read means 300 reads out the data elements based on, and transmits the read plurality of data elements are to the external terminal device transmitting means 400
And an IC card including.

[0010]

In the IC card according to the present invention, the data element holding means 100 is composed of, for example, an EEPROM,
Holds multiple data elements of a fixed size. The combined information generating means 200 generates combined information for combining any data element of these plurality of data elements in response to an input from the external terminal device, and holds it as, for example, a combined information file. When receiving the read command from the external terminal device, the data element reading unit 300 reads a plurality of data elements from the data element holding unit 100 based on the combined information. The transmitting unit 400 transmits the read data elements to the external terminal device. Therefore, a single read command can continuously read a plurality of data elements of arbitrary combinations.

[0011]

Embodiments of the IC card according to the present invention will be described below with reference to the drawings.

First embodiment

2 to 13 are views for explaining the IC card according to the first embodiment of the present invention.

As shown in FIG. 2, the IC card 11
Is an I / O 12, an EEPROM 13, and a CPU 14.
And a RAM 15 are provided.

The reader / writer 21 for exchanging data with the IC card 11 has an I / O 22, a ROM 23, a CPU 24, and an R, as in the IC card 11.
AM25, and is comprised.

FIG. 3 shows the format of the data elements stored in the EEPROM 13.

As shown in this figure, a plurality of data elements 31 having a fixed length (size) are combined and stored in the EEPROM 13 as a data element file (41 in FIG. 4). Each data element 31 is sequentially numbered in the file. For example, the data element 1 is No. 0, data element 2 is No. 1, data element n + 1
Is No. n (n is an integer).

The data element file 41 including the plurality of data elements 1 to n + 1 is managed for each file in the IC card 11 as shown in FIG.

That is, the EEPROM 13 has a plurality of data element files 41 and a plurality of combined information files 42.
And a file directory 43 for managing these files.

The combined information file 42 is provided for managing each data element 31, and is created for each data element file 41.

In the combined information file 42, as shown in FIG. 5, the address of each required data element (No. 1 to No. m) is sequentially stored in a 2-byte structure.

The format of the file directory 43 is shown in FIG. This file directory 43
As shown in FIG. 6, has a 1-byte file ID at the beginning for identifying each of the above files, and hereinafter, the start address (2 bytes) of the data element stored in that file Number of data elements (1
Byte), the length of each data element 31 (for example, composed of 10 bytes), the start address (2 bytes) of the combined information corresponding to this file, and the information number (1 byte) of the combined information corresponding to the number of files. Is configured and manages these.

Further, FIG. 7 is a format of a command showing a combined information registration command for registering the combined information.

As shown in this figure, in the combination information registration command, the number of information indicating the number of combined data elements, the number of these data elements. Are shown in order, and are composed of, for example, m + 3 bytes.

The response to the combined information registration command from the reader / writer 21 is constructed as shown in FIG. It has a 4-byte structure of class, code, status 1, and status 2. The status is for indicating a registration error or the like.

FIG. 9 shows a data element read command from the reader / writer 21, and FIG. 10 shows a response thereto.

The data element read command has a 2-byte structure and indicates a class CLS and a code COD. The response to this is the class CLS
, A code C code COD, a status 1, a status 2, and a data element desired to be read.

The operation will be described below.

As shown in these figures, the IC card 11 transmits the ATR information to the reader / writer 21 after the hard reset, and then enters the command receiving state.

In this state, first, the combined information file 42 is registered in the IC card 11. That is, the information (data element) to be registered and the number of information items from the reader / writer 21 as an interface device for the IC card 11 in the command receiving state are combined as a combined information registration command as shown in FIG. It is transmitted to the IC card 11.

The IC that has received this combined information registration command
The card 11 follows the flowchart of FIG.
The addresses of the data elements are stored in the combined information file 42.

That is, first, the number of pieces of information is set in the counter of the RAM 15 from the combined information registration command (step S1101), and the start address of the combined information file is set in the directory (S1102).

Next, the No. of the first data element of the respective data elements included in the combined information registration command. (Eg N
o. 0) is set in the RAM 15 (S1103).

Then, this No. Add 1 to 0 (=
1) This value is compared with the number of data elements (n + 1 in the example of FIG. 3) (S1104). The number of data elements is EEPRO
M13 shows the total of the data elements 31 stored and registered as shown in FIG.

No. of this data element If the value obtained by adding 1 to (1) is smaller than the number of data elements (S1104
NO), the start address of the data element is obtained (S11
05). For example, the data element length (for example, 1 byte) is assigned to the No.
The value to be multiplied by is added. On the other hand, the data element No. If the value obtained by adding 1 to is not smaller than the number of data elements (YES in S1104), the abnormal status is set (S1106).

The start address calculated in the above step S1105 is set in the combined information file (FIG. 6) in the next step S1107. Then, 2 is added to the address of this combined information file (S1108).

Next, the counter is decremented by 1 (S1
109), it is determined whether or not the value of the counter has become 0 (S1110). If not 0, the above step S110
Return to 3.

If the counter is 0, the setting for all the data elements has been completed, so the normal status is set and the program ends (S1111).

When the storage of the combined information file is completed as described above, or when there is an abnormality, a status is set accordingly and a response is returned to the reader / writer 21 which is an interface device. After the registration of this combined information file, the data element read command can be executed in the IC card 11.

Next, when it is desired to read the data element according to the registered information from the reader / writer 21, a data element read command (FIG. 9) is transmitted to the IC card 11.

IC card 1 which has received the read command
1 is according to the flowcharts of FIGS. 12 and 13.
Execute that command.

First, the error flag is cleared (S120
1), the start address of the combined information file registered in the file directory (FIG. 6) is set in the RAM 15 (S1202).

Then, it is checked in the file directory whether there is a combined information file (S1203),
If the combined information file does not exist, an abnormal status is set and a response is returned to the reader / writer 21 (S1).
211).

When the combined information file exists (S12)
(NO at 03), reads the number of information from the file directory, sets it in the counter (S1204), and further reads the data element (S1205).

That is, as shown in FIG. 13, first, the head address of the data element is set in the RAM 15 based on the head address of the data element set in the RAM 15 in step S1202 (S1301).

Then, each data element designated in this way is stored in the EEPROM 13 based on the address.
The data is read from the (data element file) to a predetermined area of the RAM 15 (S1302).

At the time of this reading, it is checked whether or not an error has occurred (S1303), and if a reading error has occurred, "1" is set in the error flag (S).
1305).

If the reading is normal (NO in S1303), 2 bytes are added to the file address and set (S1304).

When the data element read routine is completed in this way, the flow advances to the next step S1206 to set the read data elements one by one in the output buffer (S1206) and whether or not the error flag is "0". It is checked (S1207).

When a read error occurs, an abnormal status is set (S1211) and a response is returned to the reader / writer 21. If the reading is normal, the counter is decremented by 1 (S1208), and the reading process is continued until it becomes 0 (return to S1205). That is, it is checked whether or not the value of the counter has become 0 (S120
9) If the value of the counter is 0, the normal status is set (S1210), and the response (FIG. 10) including the data element set in the reader / writer 21 is returned.

Second embodiment

14 to 21 are views for explaining an IC card according to the second embodiment of the present invention.

In this embodiment, as shown in FIGS. 14 and 15, the head area (2 bytes) of each data element stored in the memory (EEPROM 13) is labeled, as in the first embodiment. A separate binding information file is not provided separately. That is, the IC card 11 holds a plurality of data element files 1501 and a file directory 1502 for these data element files 1501.

In this case, the label is attached to each data element and is used to specify the data element to be accessed. For example, the reading order of the data elements to be read is registered in the label. Then, referring to these labels, the plurality of data elements can be designated by one command and read.

FIG. 16 shows a file directory 1502.
Shows the format of. That is, file I
This file directory 1502 is composed of D, the start address of the data element, the number of data elements, the length of the data element, the number of information items, and the like.

FIG. 17 shows a combined information registration command, and FIG.
Indicates the response to this command, respectively. In the combined information registration command, after the class, code, and number of information, for example, in order of reading, the data element number.
Is registered as 1-byte information.

FIG. 19 is a flow chart showing the processing procedure when the IC card 11 receives the combined information registration command.

First, the number of information is set in the counter (S
1901). This number of information represents the number of data elements to be read.

Next, the read counter is cleared (S1902). These counters are all RAM1
Can be set to 5.

Next, the No. of the data element to be read. (For example, No. 2) is set in a predetermined area of the RAM 15 (S1903).

Then, the No. of this data element. 1 is added to (here, 2), and the added value (3) is compared with the number of data elements (for example, n + 1) (S1904). If the added value is not smaller than the number of data elements, the abnormal status is set and the processing ends (S1905).

If this value is smaller than the number of data elements, the data element number. The value of the reading counter is written and set in the label at the position of (S1906). That is, in this step, the reading order is registered in the label of each data element.

Then, the read counter is incremented by 1 (S1907).

Further, the information counter is decremented by 1 (S1908).

Then, it is checked whether or not the value of the information number counter has become 0 (S1909), and steps S1903, S1904, S1906 and S1 are executed until it becomes 0.
907 and S1908 are repeated.

When the information counter reaches 0, the registration of the combined information has been completed, the normal status is set, and the program ends (S1910).

FIG. 20 is a flow chart showing the procedure of the data element read command processing when the data element read command is input from the reader / writer 21 after the completion of the combined information registration routine. FIG. 21 is a flowchart showing a data element reading subroutine.

When the data element read command is received, the IC card 11 clears the error flag (S
2001).

Then, it is checked whether or not there is the number of pieces of information to be read (S2002). If there is a data element to be read, the counter is cleared (S2003).

Then, the reading of the data elements shown in FIG. 21 is executed by the subroutine processing (S2004).

That is, first, the label of each data element is searched (S2101), and the data element having the label equal to the counter value is read into a predetermined area of the RAM 15 (S2102).

Then, it is checked whether a read error has occurred (S2103), and if it has occurred, an error flag is set and the process returns to the main program (S2005 in FIG. 20).

In this step S2005, the read data element is set in the output buffer, and then it is checked whether an error flag is set (S2006). When a read error occurs as described above, the error flag is set, and the process ends.

When the error flag is not set, it indicates that the reading was normal. Therefore, the value of the counter is incremented by 1 (S2007), and the value of the counter is compared with the number of information items (S2008). Until the counter value reaches the value indicating the number of data elements to be read, steps S2004, S2005, S2006, S
Repeat 2007.

As a result, when all the data elements to be read are set in the output buffer, the normal status is set and the program ends (S2009).

As described above, in this embodiment, a plurality of data elements can be collectively read by one read command by labeling each data element without creating a combined information file.

[0077]

As described above, according to the present invention, the efficiency of reading data from the IC card can be improved. Moreover, the security of the IC card can be improved without reading the extra data.

Since the user data is internally represented in the form of one record and one field, and a plurality of records can be simultaneously accessed by one command, the data can be changed and updated smoothly and the throughput of the processing system can be increased. IC
Cards can be realized without compromising security.

[Brief description of drawings]

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

FIG. 2 is a block diagram showing a configuration of an IC card according to the first embodiment of the present invention.

FIG. 3 is a block diagram showing a format of a data element according to the first embodiment of the present invention.

FIG. 4 is a conceptual diagram showing a hierarchical structure of a directory according to the first exemplary embodiment of the present invention.

FIG. 5 is a block diagram showing a combined information file according to the first embodiment of the present invention.

FIG. 6 is a block diagram showing a file directory according to the first embodiment of the present invention.

FIG. 7 is a block diagram showing a format of a combined information registration command according to the first embodiment of the present invention.

FIG. 8 is a block diagram showing a format of a combined information registration response according to the first embodiment of the present invention.

FIG. 9 is a block diagram showing a format of a data element read command according to the first embodiment of the present invention.

FIG. 10 is a block diagram showing a format of a read response according to the first embodiment of the present invention.

FIG. 11 is a flowchart showing a combined information registration command processing routine according to the first embodiment of the present invention.

FIG. 12 is a flowchart showing a data element read command processing routine according to the first embodiment of the present invention.

FIG. 13 is a flowchart showing a data element reading routine according to the first embodiment of the present invention.

FIG. 14 is a conceptual diagram showing a format of a data element according to the second embodiment of the present invention.

FIG. 15 is a conceptual diagram showing a directory structure according to a second embodiment of the present invention.

FIG. 16 is a block diagram showing a file directory according to a second embodiment of the present invention.

FIG. 17 is a block diagram showing a format of a combined information registration command according to the second embodiment of the present invention.

FIG. 18 is a block diagram showing a response to a combined information registration command according to the second embodiment of the present invention.

FIG. 19 is a flowchart showing a procedure of combined information registration command processing according to the second embodiment of the present invention.

FIG. 20 is a flowchart showing a procedure of device element read command processing according to the second embodiment of the present invention.

FIG. 21 is a flowchart showing a procedure for reading device elements according to the second embodiment of the present invention.

[Explanation of symbols]

 11 IC Card 100 Data Element Holding Means 200 Combined Information Generating Means 300 Data Element Reading Means 400 Sending Means

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Claims (1)

(57) [Claims] 1. At least a CPU and an intervention of the CPU
Equipped with a memory that can write and read data
And an IC card connected to an external terminal device
Te, the note a plurality of data elements consists of constant size
A data element holding means for holding on Li, and binding information generating means for generating a binding information for binding any data element of the plurality of data elements, held on the memory, the external terminal when receiving a read command from the device, and means out data relevant pixel read from the data element holding means reads the <br/> plurality of data elements based on the binding information, said external terminal the read plurality of data elements has been An IC card, comprising: a transmitting unit for transmitting to the device.