JP2720701B2 - Program writing device for 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 a program writing device for an IC card which downloads a program from a source file into a data memory of the IC card. And a program writing device for guaranteeing a normal operation of a program in an IC card.

[0002]

2. Description of the Related Art In some cases, an application program is downloaded from a source file into a data memory of an IC card and used. In this case, when the source program is translated (compiled) into an object program, if a compile error occurs in the program, it is indicated in a compile error list. However, if this compile error list is overlooked, an incomplete object program will be downloaded to the IC card. That is, I
When downloading the object program to the C card, it was impossible to determine whether or not the object program was correctly translated.

[0003]

As described above, the conventional IC
In a device for writing a program to a card, it is not possible to prevent an unauthorized program or a program having a compile error from being written into a memory, and therefore, it is possible to prevent an unauthorized use of an IC card, for example, falsification of data. could not. Also, program runaway,
Data destruction could not be prevented.

SUMMARY OF THE INVENTION Accordingly, the present invention provides an IC card program writing device capable of preventing unauthorized use of an IC card, for example, falsification of data in a memory, and preventing runaway of the program and destruction of the data. For that purpose.

[0005]

According to a first aspect of the present invention, there is provided an IC card program writing apparatus for writing a program on an IC card, comprising: a translating means for translating a source program into an object program; Whether there is an error,
Checking means for checking whether or not the object program has been properly created; code assigning means for assigning an authentication code to an object program that has been created properly and having no translation error; An IC card program writing device comprising: a code determination unit for determining the presence or absence of an authentication code; and a writing unit for writing an object program having an authentication code into a memory.

[0006]

In the IC card program writing device according to the present invention, the source program is translated into an object program, and if there is no error in the translation, an authentication code is added to the object program. Also, it checks whether or not this object program has been properly created, and assigns an authentication code only to a valid program. Then, when writing the program to the memory of the IC card, the authentication code is checked,
Download only the object program that has the authentication code.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a program writing device for an IC card according to the present invention. FIG.
FIG. 3 to FIG. 3 are for explaining one embodiment of the present invention.

In FIG. 1, reference numeral 10 denotes an IC card,
Reference numeral 20 denotes a reader / writer (terminal) that can write a program or the like on the IC card 10. The IC card 10 has a known configuration, and includes an I / O, a CPU,
A ROM, a RAM and the like are provided. Also, reader / writer 2
Even if it is set to 0, it is similarly configured to have an I / O, CPU, ROM, and RAM.

As shown in FIG. 1, in a reader / writer 20, a compiling means 21 for compiling a source program, a checking means 22 for checking a compile error and a program validity, and Code assigning means 23 for assigning an authentication code. On the other hand, even in the case of the IC card 10, a code discriminating means 11 for discriminating the presence or absence of an authentication code for the object program,
And storing the object program in a memory (for example, EE
(PROM).

The compiling means 21 includes an assembler language,
It translates a source program written in a procedural language into a machine language object program.
The checking means 22 checks a compile error and checks whether the source program is created by a valid terminal or a valid person. Then, the code adding unit 23 performs an arithmetic process on at least one part of the object program output by the compiling unit 21 in consideration of at least one secret data to generate and add an authentication code. . The code adding unit 23 operates only when a translation error is not detected by the checking unit 22 and when the validity of the source program is confirmed. Further, the code discriminating means 11 checks whether or not the above-mentioned authentication code is given to the object program to be written. For example, a comparison code is created for a write command, and the comparison code is compared with an authentication code of the object program. The writing unit 12 has a known configuration, and writes an object program in a machine language format into a memory (may be an EEPROM or a RAM) of the IC card 10. The CPU operates based on the written object program to execute the program. As the object program, in the case of a bank card, there are a deposit balance inquiry program, a passbook entry program, and the like.

The operation of the present invention will be described below with reference to the flowcharts of FIGS. First, a routine for assigning a code will be described with reference to FIG. In this routine, a desired source program (application program in a compiler language, an assembler language, or the like) is read from a source file (S
21) It is checked whether this source program is legitimate (S22). For example, it is checked whether the terminal is read from a legitimate terminal or a legitimate source file. If the validity is confirmed, the source program is translated into a machine language program (S23), and it is checked whether there is an error in the translation (S24). If there is no error, an authentication code is attached to this object program (S25). Then, this object program is stored as an object file (S
26). If the source program is not valid,
For example, in the case of a forged fraudulent program, or
If a compile error occurs, the processing is interrupted at that point.

FIG. 3 shows a routine for writing the object program created in this way to the memory of the IC card 10. In this case, if a write command is input (S31), the IC card 10 once reads the object program specified by the command (S32). Then, the authentication code is checked for this object program (S33),
If there is no authentication code, the process is interrupted (S37). If the user has an authentication code, the comparison code is calculated and created based on the write command (S3).
4). For example, it is assumed that the calculation is performed based on the device ID, the operator ID, and the like. Then, the comparison code is compared with the authentication code (S35). If these codes match, the object program is stored in the CPU of the memory.
Download to the scheduled area (S36). If they do not match, the process is interrupted (S37).

Further, the present invention is not limited to the above-described embodiment, and it is needless to say that a program may be written into a memory of an IC card by a reader / writer (terminal). is there.

It should be noted that the present invention is not limited to an IC card, but can be applied to other information cards such as an optical card.

[0015]

According to the present invention, there is no possibility of downloading an object program having a translation error into an IC card, and as a result, runaway of an unknown unknown IC card and destruction of data are eliminated. In addition, it is possible to prevent download of an illegally created object program. As a result, unauthorized use of the IC card, for example, falsification of data in the memory can be prevented.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an IC card program writing device according to one embodiment of the present invention.

FIG. 2 is a flowchart showing a procedure for assigning a code to a program in the IC card program writing device according to one embodiment of the present invention.

FIG. 3 is a flowchart showing a procedure for writing a program to a memory of an IC card in the IC card program writing device according to one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 IC card 11 Code discrimination means 12 Writing means 20 Reader / writer 21 Compile means 22 Check means 23 Code addition means

Claims (1)

(57) [Claims] An IC for writing a program to an IC card
A translation means for translating a source program into an object program in a card program writing device; a check for checking whether or not a translation error exists in the object program and whether or not this object program has been properly created; Means, a code providing means for providing an authentication code for an object program which is properly created and has no translation error, a code determining means for determining the presence or absence of the authentication code for the object program, and an object program having the authentication code. Writing means for writing to a memory.
Program writing device for C card.