JP7438432B1 - Electronic information storage medium, IC chip, IC card, record writing method, and program - Google Patents

Abstract

The present invention provides an electronic information storage medium, an IC chip, an IC card, a record writing method, and a program that allow an issuer to issue records in any order without being aware of record numbers. SOLUTION: An IC chip 1 maintains a management table for managing record numbers of records, and upon receiving an issue command including a record and the record number of the record from an external device 2, selects one of a plurality of Record classes. Writes the record included in the issue command to the Record class to which no record has been written, and registers the record number of the record in the element of the management table associated with the Record class. [Selection diagram] Figure 4

Description

The present invention relates to a technical field such as an IC (Integrated Circuit) chip capable of writing a plurality of records from an external device.

Conventionally, as disclosed in Patent Document 1, for example, in a record issuing process for writing a plurality of records stored in a file to be used by an IC chip to the IC chip, an issuer (manufacturer) of the IC chip A plurality of write commands are sequentially transmitted from the issuing device to the IC chip.

Patent No. 6556489

However, in the conventional IC chip, in the record issuing process, there are cases where it is necessary to match the record number of each record and the order in which the records are issued (writing order). For example, the Append Record command defined in the JICSAP specifications is a command that appends a record to a file specified by a parameter, but the record numbers of the appended records are assigned in the order of publication. Therefore, the IC chip issuer needs to design the execution order of the write commands with the final record configuration in mind, which takes time and effort.

Therefore, the present invention has been made in view of the above points, and provides an electronic information storage medium, an IC chip, an IC card, and an IC chip that allows an issuer to issue records in any order without being aware of the record number. An example of the problem is to provide a record writing method and program.

In order to solve the above problem, the invention according to claim 1 provides an electronic information storage medium comprising a memory having a plurality of record storage areas for writing records, the electronic information storage medium having a memory for managing identifiers of the records. holding means for holding a table; receiving means for receiving a command including a record and an identifier of the record from an external device; The present invention is characterized by comprising processing means for writing the included record and registering the identifier of the record in an element of a management table associated with the record storage area.

The invention according to claim 2 is the electronic information storage medium according to claim 1, in which one record in a file that logically stores a plurality of records is written in one record storage area. , the command includes the record, an identifier of the record, and an identifier of a file that logically stores the record, and the processing means writes the record included in the command to a record storage area where the record is not written. , and registers the identifier of the record and the identifier of the file that logically stores the record in the element of the management table associated with the record storage area.

According to a third aspect of the invention, in the electronic information storage medium according to the first aspect, the receiving means sequentially receives a plurality of the commands, and the contents of the records included in each of the commands are different from each other. It is characterized by

According to a fourth aspect of the invention, in the electronic information storage medium according to the first aspect, the processing means searches for a record storage area in which the record is not written based on the arrangement of the record storage area. It is characterized by

The invention according to claim 5 provides an IC chip comprising a memory having a plurality of record storage areas for writing records, the IC chip comprising: a holding means for holding a management table for managing identifiers of the records; and an external device. receiving means for receiving a command including a record and an identifier of the record from a record storage area, and writing a record included in the command into a record storage area in which the record is not written among the plurality of record storage areas; and processing means for registering an identifier of the record storage area in an element of a management table associated with the record storage area.

The invention according to claim 6 provides an IC card comprising a memory having a plurality of record storage areas for writing records, the IC card comprising: a holding means for holding a management table for managing identifiers of the records; and an external device. receiving means for receiving a command including a record and an identifier of the record from a record storage area, and writing a record included in the command into a record storage area in which the record is not written among the plurality of record storage areas; and processing means for registering an identifier of the record storage area in an element of a management table associated with the record storage area.

The invention according to claim 7 is a record writing method executed by an electronic information storage medium including a memory having a plurality of record storage areas for writing records, the method comprising: a management table for managing identifiers of the records; a step of receiving a command including a record and an identifier of the record from an external device; and a step of retaining a record included in the command in a record storage area to which the record is not written among the plurality of record storage areas. and registering the identifier of the record in an element of a management table associated with the record storage area.

The invention according to claim 8 includes the steps of: retaining a management table for managing identifiers of the records in a computer included in an electronic information storage medium having a plurality of record storage areas for writing records; and an external device. a step of receiving a command including a record and an identifier of the record from a record storage area, and writing the record included in the command to a record storage area in which the record is not written among the plurality of record storage areas; The present invention is characterized by performing the step of registering an identifier in an element of a management table associated with the record storage area.

According to the present invention, a publisher can issue records in any order without being aware of record numbers.

1 is a diagram showing an example of a hardware configuration of an IC chip 1. FIG. FIG. 2 is a conceptual diagram showing an example of an arrangement of Record classes in a record body. FIG. 7 is a conceptual diagram showing an example of the correspondence between the Record class and the elements of the management table. 5 is a flowchart showing an example of an issuance process executed by the CPU 15 of the IC chip 1. FIG. 5 is a conceptual diagram showing an example of the correspondence between the Record class and the elements of the management table when a new record is written in the issuing process shown in FIG. 4. FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[1. Configuration and functions of IC chip 1]
First, with reference to FIG. 1, the configuration and functions of an IC chip 1 according to the present embodiment will be described. The IC chip 1 is an example of the electronic information storage medium of the present invention. The IC chip 1 is installed in, for example, an IC card such as a credit card, a cash card, or a My Number card, or a mobile device such as a smartphone. In the case of a mobile device such as a smartphone, the IC chip 1 may be mounted on a small IC card that is removable from the mobile device, or may be installed as an eUICC (Embedded Universal Integrated Circuit Card) so that it cannot be easily removed or replaced from the mobile device. It may also be mounted on a built-in board.

FIG. 1 is a diagram showing an example of the hardware configuration of the IC chip 1. As shown in FIG. As shown in FIG. 1, the IC chip 1 includes an I/O circuit 11, a RAM (Random Access Memory) 12, an NVM (Nonvolatile Memory) 13, a ROM (Read Only Memory) 14, and a CPU (Central Processing Unit) 15 (computer). (for example), and a coprocessor 16 that performs cryptographic operations and the like. The I/O circuit 11 serves as an interface with the external device 2. Note that the communication between the IC chip 1 and the external device 2 may be non-contact communication or contact communication. In the case of contactless communication, communication between the IC chip 1 and the external device 2 is performed, for example, via an antenna (not shown) mounted on an IC card or a mobile device. Note that an example of the external device 2 is an issuing device (issuing terminal) in a factory.

For example, a flash memory is applied to the NVM 13. Note that the NVM 13 may be an "Electrically Erasable Programmable Read-Only Memory." The NVM 13 or the ROM 14 stores an OS (Operating System), one or more applications (including the program of the present invention), and the like. The NVM 13 has a record body for writing (storing) records. Here, a record is data that is logically stored (in other words, logically organized) in a file (eg, EF (Elementary File)) used by an application. Examples of records include configuration data that determines the operation of an application, key data necessary for encryption and decryption operations, and certificate data. Multiple records can be stored in one file. Multiple files may be used by one application. Each file is assigned an SFI (Short File Identifier), which is a file identifier. Each record is given a record number (that is, a logical number in the file) that is a record identifier. A record can be uniquely identified by specifying the SFI and record number.

The record body is implemented, for example, as an array of multiple Record classes (an example of a record storage area). Each Record class is a class (a collection of data and processing) for saving the contents of one record. For example, each time a new record is published, the newly published record is created as an instance of the Record class and added to a free element (i.e., Record class) in the above array. FIG. 2 is a conceptual diagram showing an example of the arrangement of the Record class in the record body. In the example of FIG. 2, the Record class is represented as Record[0] to [3]. For example, a record (0000...) stored in Record[0] is specified by SFI "1" and record number "1". In the existing implementation, when a record issuing command such as the Append Record command is received, elements are sequentially added to the record body array and written to the added elements, as shown in Figure 2. Record numbers for records are automatically assigned in the order they are written. For example, record numbers are assigned sequentially as 1 → 2 → 3 in the order in which records are written. Therefore, the IC chip issuer had to design the execution order of the issuing commands with the final record configuration in mind.

On the other hand, in the NVM 13 according to this embodiment, a management table for managing record numbers of records stored in the Record class is stored in a storage area separate from the record body. That is, in this embodiment, the IC chip has a management table as a data structure that manages the record number of the record, separate from the record body that actually stores the contents of the record. Each Record class is associated with elements of the management table. The elements of the management table are implemented as integer type arrays, for example, similar to the array of the Record class. FIG. 3 is a conceptual diagram showing an example of the correspondence between the Record class and the elements of the management table. In the example of FIG. 3, the elements of the management table are represented as Table[0] to [3]. Furthermore, in the example of FIG. 3, a value that combines the SFI and the record number is registered in each element of the management table. For example, in Figure 3, the SFI of the record saved in Record[0] is "2" and the record number is "1", and the SFI of the record saved in Record[2] is "2" and the record number is It is “3”. Such a management table allows an IC chip issuer to issue records in any order without being aware of record numbers.

The CPU 15 (an example of a computer) functions as a holding means, a receiving means, a processing means, etc. in the present invention by executing the OS and applications (including the program of the present invention) stored in the NVM 13. The CPU 15 uses the NVM 13 to maintain the management table described above. Further, in the record issuing process, the CPU 15 receives an issuing command such as an Append Record command from the external device 2 via the I/O circuit 11. Here, the issued command is configured by a command APDU (Application Protocol Data Unit) defined in ISO/IEC 7816, for example. The command APDU is composed of a header section consisting of CLA, INS, P1, and P2, and a body section in which a record is set as issue data. CLA indicates a command class (instruction class), and INS indicates a command code (instruction code). The type of command is specified by the INS. P1 and P2 indicate command parameters. The data portion also includes the record number of the record and the SFI of the file that logically stores the record. Note that the record number and SFI may be included in P1 or P2. Then, in accordance with the received issue command, the CPU 15 writes the record included in the issue command to the Record class in which no record has been written, and writes the record number of the record and the file that logically stores the record. Register (record) the SFI in the management table element associated with the relevant Record class.

[2. Operation of IC chip 1]
Next, the operation of the IC chip 1 according to this embodiment will be described with reference to FIGS. 4 and 5. FIG. 4 is a flowchart showing an example of the issuing process executed by the CPU 15 of the IC chip 1. FIG. 5 is a conceptual diagram showing an example of the correspondence between the Record class and the elements of the management table when a new record is written in the issuing process shown in FIG.

For example, in a record issuing process at a manufacturing factory of the IC chip 1, when the IC chip 1 receives an issue command from the issuing device, which is the external device 2, the process shown in FIG. 4 is started. Note that the issuing process shown in FIG. 4 is repeatedly executed until writing of all records necessary for the operation of the application is completed. That is, the IC chip 1 sequentially receives a plurality of issuing commands. The contents of issue data (records) included in each issue command are basically different from each other.

When the process shown in FIG. 4 is started, the CPU 15 acquires a record, the record number of the record, and the SFI of the file storing the record from the issue command (step S1). Next, the CPU 15 searches for an empty element in the array of the record body from the beginning (step S2), and executes a process of writing the record obtained in step S1 to the Record class that is the found empty element (step S2). S3). For example, as shown in FIG. 5, if Record[0] to Record[3] have been written, the new record obtained in step S1 is written to Record[4].

Next, the CPU 15 determines whether a write error has occurred in the write process of step S3 (step S4). If it is determined that a write error has occurred (step S4: YES), a response indicating the error is returned to the issuing device (step S5). On the other hand, if it is determined that no write error has occurred (step S4: NO), the CPU 15 assigns the value obtained by combining the SFI and record number acquired in step S1 to the Record class in which the record was written. It is registered as an element of the attached management table (step S6). For example, as shown in FIG. 5, the value "0102" obtained by combining the SFI "1" acquired in step S1 and the record number "2" is registered (recorded) in Table[4]. Next, the CPU 15 returns a response indicating normal termination to the issuing device (step S7).

As explained above, according to the above embodiment, the IC chip 1 holds a management table for managing record numbers of records, and receives an issue command including a record and the record number of the record from the external device 2. Then, among the multiple Record classes, the record included in the issue command is written to the Record class to which no record has been written, and the record number of the record is registered in the element of the management table that is associated with the record class. Since the system is configured as follows, the issuer can issue records in any order without being aware of record numbers.

For example, brands that provide credit card payment applications may specify the order in which each record is written, and with conventional IC chips, record numbers are assigned sequentially in the order in which records are written. The issuer needed to design (for example, rearrange) the execution order (that is, the transmission order) of each issued command in the issued command group. However, according to the IC chip 1 according to the present embodiment, since the record number is managed by associating the elements of the management table with the Record class as described above, each issue command It is possible to reduce the effort required to design the execution order as in the past.

1 IC chip 11 I/O circuit 12 RAM (
13 NVM
14 ROM
15 CPU
16 Coprocessor

Claims (8)

An electronic information storage medium comprising a memory having a plurality of record storage areas for writing records,
holding means for holding a management table for managing identifiers of the records;
Receiving means for receiving a command including a record and an identifier of the record from an external device;
Writing the record included in the command to a record storage area in which the record is not written among the plurality of record storage areas, and registering the identifier of the record in an element of a management table that is associated with the record storage area. a processing means for
An electronic information storage medium comprising: Any one of the records in a file that logically stores a plurality of records is written in one of the record storage areas,
The command includes the record, an identifier of the record, and an identifier of a file that logically stores the record,
The processing means writes the record included in the command to a record storage area in which the record is not written, and corresponds the identifier of the record and the identifier of the file that logically stores the record to the record storage area. 2. The electronic information storage medium according to claim 1, wherein the electronic information storage medium is registered as an element of an attached management table. The receiving means sequentially receives the plurality of commands,
The electronic information storage medium according to claim 1, wherein the contents of the records included in each of the commands are different from each other. 2. The electronic information storage medium according to claim 1, wherein the processing means searches for a record storage area in which the record is not written based on the arrangement of the record storage area. An IC chip comprising a memory having a plurality of record storage areas for writing records,
holding means for holding a management table for managing identifiers of the records;
Receiving means for receiving a command including a record and an identifier of the record from an external device;
Writing the record included in the command to a record storage area in which the record is not written among the plurality of record storage areas, and registering the identifier of the record in an element of a management table that is associated with the record storage area. a processing means for
An IC chip characterized by comprising: An IC card comprising a memory having a plurality of record storage areas for writing records,
holding means for holding a management table for managing identifiers of the records;
Receiving means for receiving a command including a record and an identifier of the record from an external device;
Writing the record included in the command to a record storage area in which the record is not written among the plurality of record storage areas, and registering the identifier of the record in an element of a management table that is associated with the record storage area. a processing means for
An IC card characterized by comprising: A record writing method performed by an electronic information storage medium comprising a memory having a plurality of record storage areas for writing records, the method comprising:
maintaining a management table for managing identifiers of the records;
receiving a command including a record and an identifier of the record from an external device;
Writing the record included in the command to a record storage area in which the record is not written among the plurality of record storage areas, and registering the identifier of the record in an element of a management table that is associated with the record storage area. the step of
A record writing method characterized by comprising: A computer included in an electronic information storage medium having a plurality of record storage areas for writing records;
maintaining a management table for managing identifiers of the records;
receiving a command including a record and an identifier of the record from an external device;
Writing the record included in the command to a record storage area in which the record is not written among the plurality of record storage areas, and registering the identifier of the record in an element of a management table that is associated with the record storage area. the step of
A program characterized by executing.

Images