JP4026796B2 - IC card with command distribution function - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an arithmetic processing system (OS) for an IC card having an arithmetic processing function.
[0002]
[Prior art]
FIG. 3 is a conceptual diagram of a system using an IC card.
When the IC card 2 is set in the terminal device 1, the terminal device 1 transmits a command (command) to the IC card 2, and the IC card 2 that receives the command interprets the command and writes, reads, reads, etc. This processing is executed, and the processing result is returned to the terminal device 1 as a response.
[0003]
FIG. 4 is a diagram showing the configuration of the IC card.
The IC card 2 has a CPU 20, a RAM 21, a ROM 22, and an EEPROM 23 (other memory may be used as long as it is a non-volatile memory), reads a program stored in the ROM 22 into the CPU 20, and sends a command transmitted from the terminal device 1 Is received through the I / O port (interface with the terminal), this is interpreted, the data transmitted with the command is read, the necessary processing is performed, the result is written to a predetermined file area of the EEPROM 23, and the I / O port The response is output through The program may be stored in the EEPROM 23.
[0004]
In such an IC card, when a plurality of applications with different specifications are installed, a command set common to all applications (as shown in FIG. Instructions to select and issue commands that can be executed for each application with processing contents corresponding to the instruction code to be transmitted and programs to be executed in correspondence (for example, set in ROM) The command was issued under a predetermined rule. Alternatively, each application has a command with a different instruction code, so that the OS determines that it is a different command even if it is the same type of command and resolves the conflict.
[0005]
[Problems to be solved by the invention]
In the conventional IC card, when a plurality of applications are mounted, the same command set is used, so that it is not possible to cope with the detailed specifications required for each application. In order to correspond to the detailed specifications for each application, it is necessary to have a command set for each application. Therefore, even for commands according to the ISO standard, the instruction code must be changed according to the specifications. For this reason, the interface between the terminal and the IC card loses its flexibility, and further uses a redundant memory space.
[0006]
The present invention is for solving the above-described problems. When a plurality of applications having different specifications are mounted on an IC card, it is possible to avoid command conflict between applications and to provide flexibility of commands to the card. The purpose is to.
[0007]
[Means for Solving the Problems]
The present invention comprises a read-only memory, a temporary storage and working memory, a rewritable nonvolatile memory, and an arithmetic processing unit, wherein a plurality of applications are stored in the rewritable nonvolatile memory, and a command set common to each application IC card with a dedicated command set for each application. When a command is received from the outside, the dedicated command set for the selected application is searched. When the search is successful, the command is executed. A command distribution means for distributing a command so as to search for a common command set when it cannot be searched is provided.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below.
FIG. 1 is a diagram for explaining the function of the IC card of the present invention. Needless to say, the IC card described below is not limited to a card shape, and includes portable cards, and can be widely applied to contact type and / or non-contact type IC cards.
The command distribution means 30 has a function of distributing commands (instruction codes) issued from the terminals to a common command set 31 or a dedicated command set set for each application. The common command set 31 is stored in, for example, the ROM, and is a command set common to each application such as a read command, a write command, and an erase command. Each application 1, 2,. A set is provided. As shown in FIG. 5, the command set associates the processing content for each instruction code with the execution program.
[0009]
When a command is received from the terminal, the command distribution unit 30 looks at which application is selected. For example, when the application 1 is selected, the command distribution unit 30 first distributes the received command to the dedicated command set of the application 1 and applies. Search for a command. If there is a corresponding command set, the command is interpreted and executed. On the other hand, if there is no corresponding command in the dedicated command set, the command distribution means 30 distributes to the common command set 31 and searches whether there is a corresponding one.
In this way, we have a common command set and a dedicated command set specialized for the application, so when adding a new application, by adding a dedicated command set specialized for that application at the same time, Existing common command sets can be used without wasting.
[0010]
〔Example〕
Application A and application B are installed in the IC card. Although the command specifications of the two applications are different, it is assumed that commands having the same instruction code exist. For example,
Application A: READ RECORD command (Only one record can be read)
Application B: READ RECORD command (multiple records can be read)
In this case, when the IC card receives the command and the application A is selected, first, the instruction code of the received READ RECORD command is searched from the command set dedicated to the application A. If the search is successful, the command is executed. If the search is unsuccessful, a common command set is searched.
[0011]
FIG. 2 is a diagram showing the search processing flow of the above embodiment.
When the IC card receives the READ RECORD command, it is checked whether the READ RECORD exists in a dedicated command set specialized for the selected application, and if it exists, the READ RECORD command of the selected application is executed. On the other hand, if READ RECORD does not exist in the command set dedicated to the selected application, a common READ RECORD command is executed.
[0012]
【The invention's effect】
As described above, according to the present invention, although the IC card has different specifications, even when a command having the same instruction code is received, the command specialized for the selected application is executed. If there is no specialized command, a common command can be searched and executed. Therefore, the terminal can transmit a command without considering the difference in command specifications for each application.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating functions of an IC card according to the present invention.
FIG. 2 is a diagram illustrating a search processing flow according to an embodiment.
FIG. 3 is a conceptual diagram of a system using an IC card.
FIG. 4 is a diagram showing a configuration of an IC card.
FIG. 5 is a diagram illustrating a command set.
[Explanation of symbols]
30 ... Command distribution means, 31 ... Common command set.

Claims (1)

An IC card having a read-only memory, a temporary storage and working memory, a rewritable nonvolatile memory, an arithmetic processing unit, a plurality of applications stored in the rewritable nonvolatile memory, and a common command set for each application In, each application has a dedicated command set. When a command is received from the outside, the dedicated command set for the selected application is searched. If the search is successful, the command is executed and cannot be searched. An IC card with a command distribution function, characterized by comprising command distribution means for distributing commands so that a common command set is retrieved in the event.

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