JP5492172B2 - Portable electronic device, IC card and IC module - Google Patents

Description

Embodiments described herein relate generally to a portable electronic device , an IC card, and an IC module .

  Recently, as a portable electronic device, an EEPROM as a data memory, a RAM as a working memory, a CPU as a control element for accessing (reading or writing data, etc.) the memory, and an operation of the CPU It has a ROM as a program memory that stores programs (programs that interpret and execute commands, etc.), interprets commands input from an external card reader / writer, executes data write processing and read processing, IC cards that output the result to an external card reader / writer are used in various industries.

  In general, in this type of IC card, for example, a program (program code) for performing processing related to memory writing in response to a file creation command for creating a file in a data memory, a write command, A program that interprets and executes a command, such as a program that performs a memory write process or a read process in response to a read command, is usually stored in advance in a ROM.

  Conventionally, however, as described above, a program for interpreting and executing a command is stored in the ROM in advance. Therefore, depending on the value of the program counter in the event of a hardware malfunction, the data error to the data memory may be reduced. There is a problem that writing or erroneous reading of data in the data memory may occur.

JP 2003-22425 A

An object of the present invention is to provide a portable electronic device , an IC card, and an IC module that can prevent erroneous data writing and erroneous reading due to hardware malfunctions.

In the portable electronic device according to the embodiment, a volatile memory that stores data and a remaining program other than a program for processing data in the nonvolatile memory among programs that interpret and execute instructions are stored in advance. When the program for processing data for the nonvolatile memory in the specific area is converted into a state different from the original and stored in advance, and when an instruction is input from the outside, the nonvolatile memory A program for processing data in the non-volatile memory that has been converted to a different state from the original state and stored in a specific area of the volatile memory is converted into the original state and then expanded in the specific area of the volatile memory. And executing a program that interprets and executes the instruction stored in the nonvolatile memory. Processing means for executing the program by referring to or calling a program for processing data with respect to the nonvolatile memory converted into the original state stored in the specific area of the volatile memory during execution. To do.

The block diagram which shows the structural example of the IC card system which handles the IC card as a portable electronic device which concerns on embodiment. The block diagram which shows the structural example of the IC card which concerns on embodiment. The figure which shows an example of the format of the command input into the IC card which concerns on embodiment. The schematic diagram which shows roughly the structure of the working memory which concerns on embodiment. The schematic diagram which shows the relationship between the structure of the program memory which concerns on 1st Embodiment, and the program storage area of a working memory. 5 is a flowchart for explaining a flow of command processing according to the first embodiment. The schematic diagram which shows the structure of the program memory which concerns on 2nd Embodiment, and the relationship with the program storage area of a working memory. 10 is a flowchart for explaining a flow of command processing according to the second embodiment.

Hereinafter, an IC card as a portable electronic device according to an embodiment will be described with reference to the drawings.
First, the first embodiment will be described.

  FIG. 1 shows a configuration example of an IC card system that handles an IC card as a portable electronic device according to the present embodiment. In this IC card system, an IC card 101 can be connected to a terminal device 103 such as a personal computer via a card reader / writer 102, and a keyboard 104, a CRT display unit 105, and a printer 106 are connected to the terminal device 103. Composed.

  FIG. 2 shows a configuration example of the IC card 101. A control element (for example, CPU) 201 as a control means, a data memory 202 as a storage means, a working memory 203, a program memory 204, and a card reader / writer The communication unit 205 is configured to perform communication with the communication unit 102. Of these, the portion within the broken line (control element 201, data memory 202, working memory 203, program memory 204) is composed of one (or a plurality) of IC chips 206, and further communicates with this IC chip 206. The IC module 207 is integrated with the unit 205 in a connected state, and is embedded in an IC card body (not shown).

  The control element 201 is a control unit that performs various types of determination processing, determination processing, data processing such as writing to and reading from a memory, and the like.

  The data memory 202 is used for storing various types of data such as application data, and includes, for example, an erasable (rewritable) non-volatile memory such as an EEPROM (Electrical Erasable and Programmable Read Only Memory). ing.

  The working memory 203 is a working memory for temporarily storing processing data when the control element 201 performs processing, a part of a program input from the outside, and the like, for example, a RAM (random access memory). ) And other volatile memories.

  The program memory 204 is composed of, for example, a non-rewritable nonvolatile memory such as a mask ROM (read only memory), and a command processing program executed by the control element 201 (a program executed by interpreting a command, etc.) ) And fixed setting data are stored.

  The communication unit 205 is configured as an antenna unit when the IC card 101 is a non-contact (wireless) IC card, and receives the modulated wave transmitted from the card reader / writer 102 in a non-contact manner or transmits the modulated wave to the outside. Or to send. Further, a power supply and a clock for supplying to the internal circuit are generated from the modulated wave received by the communication unit 205. In the case of a contact type IC card, it is configured as a contact portion, and a power source and a clock are obtained by contacting with an IC card terminal portion (not shown) provided in the card reader / writer 102.

  FIG. 3 shows an example of the format of a command input from the outside to the IC card 101. In FIG. 3, 301 is called a class byte (CLA), 302 is an instruction byte (INS), 303 and 304 are parameter bytes (P1, P2), 305 is an Lc field, 306 is a command data field, and 307 is called a Le field. A part of the program to be downloaded is encrypted and stored in the command data field 306.

  FIG. 4 schematically shows the configuration of the working memory 203. The working memory 203 has a command buffer area 401 for temporarily storing a command received from the outside, and a program storage area 402 for temporarily storing a part of a program input in addition to the command.

  FIG. 5 shows the configuration of the program memory 204 according to the first embodiment and the relationship with the program storage area 402 of the working memory 203. The program memory 204 has a command processing program area 501 in which a command processing program is stored, and a decryption processing program in which a decryption processing program for decrypting a part of the encrypted program added to the command and input is stored. Processing program area 502, program calling program area 503 storing a program calling program for calling a part of the program stored in the program storage area 402 of the working memory 203, command processing program storing a command processing program An area 504 is provided, and program processing is executed in that order.

  Next, command processing according to the first embodiment in the above configuration will be described with reference to the flowchart shown in FIG.

  First, in the command processing program areas 501 and 504 of the program memory 204, some of the command processing programs (programs that interpret and execute commands) (for example, data write processing programs and data read processing programs). It is assumed that the remaining programs except for are stored in advance. The part of the program is encrypted and stored in the command data field 306 of the command, and is input together with the command.

  When a command transmitted from the card reader / writer 102 is received (step S1), the control element 201 stores the received command in the command buffer area 401 of the working memory 203 (step S2), and then stores the received command in the program memory 204. Command processing based on the program stored in the command processing program area 501 is started (step S3).

  When the process of step S3 is completed, the control element 201 proceeds to the process of the program stored in the decryption process program area 502, and performs the decryption process of a part of the program added to the command and input (step S4). ). That is, the encrypted data (that is, a part of the program) in the command data field 306 of the command stored in the command buffer area 401 of the working memory 203 is decrypted.

Next, the control element 201 stores a part of the decrypted program in the program storage area 402 of the working memory 203 (step S5).
When the process of step S5 is completed, the control element 201 proceeds to the process of the program stored in the program call program area 503 (step S6). That is, a part of the program stored in the program storage area 402 of the working memory 203 is called and the program processing (for example, data writing processing or data reading processing for the data memory 202) is performed.

  When the process of step S6 ends, the control element 201 returns to the command process based on the program stored in the command process program area 504 of the program memory 204 (step S7).

  When the process of step S7 ends, the control element 201 performs a halt (HALT) process on the program storage area 402 of the working memory 203 (step S8) and ends all the command processes.

  Thus, according to the first embodiment, of the programs that interpret and execute commands, the remaining programs except for some programs are stored in the program memory 204, and some programs are input from the outside. A command is stored in the program storage area 402 of the working memory 203 by a command, and processing is performed by referring to or calling a part of the program stored in the program storage area 402 of the working memory 203 during execution of the program that interprets and executes the command. By executing this, it is possible to prevent erroneous writing or erroneous reading of data in the data memory 202 due to a hardware malfunction or the like.

Next, a second embodiment will be described.
The difference of the second embodiment from the first embodiment is that a part of the program is specified in the program memory 204 instead of being input by adding a part of the program to the command as in the first embodiment. When a command is input, the program is stored in advance in the area, and a part of the program in the specific area is expanded and used in the program storage area 402 of the working memory 203. The rest is the first implementation. Since it is the same as the embodiment, the description is omitted, and only different points will be described below.

  FIG. 7 shows the configuration of the program memory 204 according to the second embodiment and the relationship with the program storage area 402 of the working memory 203. In the program memory 204, a command processing program area 501 in which a command processing program is stored, a part of the program is converted into a state different from the original, for example, encrypted and stored. The program expansion processing program area 505 in which a program expansion processing program for decoding a part of the program and expanding it in the program storage area 402 of the working memory 203 is stored, and the part stored in the program storage area 402 of the working memory 203 A program calling program area 503 in which a program calling program for calling the program is stored, and a command processing program area 504 in which a command processing program is stored. It is the row.

  Next, command processing according to the second embodiment in the above configuration will be described with reference to the flowchart shown in FIG.

  First, in the command processing program areas 501 and 504 of the program memory 204, some of the command processing programs (programs that interpret and execute commands) (for example, data write processing programs and data read processing programs). It is assumed that the remaining programs except for are stored in advance. Further, it is assumed that the above-mentioned part of the program is pre-encrypted and stored in the program development processing program area 505 of the program memory 204.

  When a command transmitted from the card reader / writer 102 is received (step S11), the control element 201 stores the received command in the command buffer area 401 of the working memory 203 (step S12), and then stores the received command in the program memory 204. Command processing based on the program stored in the command processing program area 501 is started (step S13).

  When the process of step S13 is completed, the control element 201 proceeds to the process of the program stored in the program expansion process program area 505, and performs the conversion process (decoding) of a part of the program to be expanded (step S14). That is, a part of the program encrypted and stored in the program expansion processing program area 505 of the program memory 204 is decrypted.

Next, the control element 201 stores (decompresses) a part of the decrypted program in the program storage area 402 of the working memory 203 (step S15).
When the process of step S15 ends, the control element 201 proceeds to the process of the program stored in the program call program area 503 (step S16). That is, a part of the program stored in the program storage area 402 of the working memory 203 is called and the program processing (for example, data writing processing or data reading processing for the data memory 202) is performed.

  When the process of step S16 ends, the control element 201 returns to the command process based on the program stored in the command processing program area 504 of the program memory 204 (step S17).

  When the process of step S17 is completed, the control element 201 performs a halt (HALT) process on the program storage area 402 of the working memory 203 (step S18) and ends all the command processes.

  As described above, according to the second embodiment, among the programs that interpret and execute commands, the remaining programs except for some programs are stored in the program memory 204, and some programs are stored in the program memory 204. When stored in the program expansion process program area 505 and a command is input, a part of the program stored in the program expansion process program area 505 of the program memory 204 is expanded in the program storage area 402 of the working memory 203. A data memory caused by a hardware malfunction or the like by executing a process by referring to or calling a part of the program stored in the program storage area 402 of the working memory 203 during execution of a program that interprets and executes the command. Day 202 It is possible to prevent the erroneous writing and erroneous reading in advance.

  In the above embodiment, the case where the portable information processing medium is applied to a non-contact type IC card has been described. However, the present invention is not limited to this. For example, a PDA having a function of a non-contact type IC card and The present invention can also be applied to a portable terminal device or a mobile phone referred to, and is not limited to a card type, but may be a booklet type, a block type, or a tag type.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 101 ... IC card (portable electronic device), 102 ... Card reader / writer, 103 ... Terminal device, 104 ... Keyboard, 105 ... CRT display part, 106 ... Printer, 201 ... Control element (CPU), 202 ... Data memory, 203 ... Working memory, 204 ... Program memory, 205 ... Communication unit, 206 ... IC chip, 207 ... IC module.

Claims (5)

Volatile memory for storing data;
Of the programs that interpret and execute instructions, the remaining programs except for some programs for processing data in the nonvolatile memory are stored in advance, and the data is processed in the specific area in the nonvolatile memory The non-volatile memory in which a part of the program is converted into a state different from the original state and stored in advance,
When an instruction is input from the outside, a part of the program for processing data for the nonvolatile memory stored in the non-volatile memory after being converted into a state different from the original state is restored to the original state. The program is expanded into a specific area of the volatile memory after being converted to the program, and a program that interprets and executes the instruction stored in the nonvolatile memory is executed, and the volatile memory is specified during the execution of the program. Processing means for executing the program by calling a part of the program for processing data to the nonvolatile memory converted into the original state stored in the area;
Comprising
Some programs for processing data in the nonvolatile memory include a program for performing a writing process for writing data input from the outside to the nonvolatile memory, and data in the nonvolatile memory. Is a program for performing read processing to read out to the outside,
The nonvolatile memory includes a program call program area,
The processing means, based on the program call program stored in said program call program area, portable electronic device to call a part of a program for processing data to the nonvolatile memory.   The portable electronic device according to claim 1, wherein the specific area of the volatile memory is subjected to a halt process when the part of the program is not stored.   The portable electronic device according to claim 1, wherein a halt (HALT) process for a specific area of the volatile memory is performed each time an instruction process ends. A volatile memory for storing data and a program other than a part of the program for processing the data in the nonvolatile memory among the programs for interpreting and executing the instructions are stored in advance, and the specific area has the aforementioned program A part of a program for processing data to the nonvolatile memory is converted into a state different from the original and stored in advance, and when an instruction is input from the outside, the nonvolatile memory is specified. A part of a program for processing data for the nonvolatile memory stored in the area after being converted to a state different from the original state is converted to the original state, and then expanded to a specific area of the volatile memory. At the same time, a program that interprets and executes the instruction stored in the nonvolatile memory is executed, and the program is executed during the execution of the program. And processing means for executing the program by calling a part of the program for processing the data to the nonvolatile memory converted into the original state stored in the specific area of the memory. IC module
An IC card body containing the IC module;
Comprising
Some programs for processing data in the nonvolatile memory include a program for performing a writing process for writing data input from the outside to the nonvolatile memory, and data in the nonvolatile memory. Is a program for performing read processing to read out to the outside,
The nonvolatile memory includes a program call program area,
The processing means, based on the program call program stored in said program call program area, IC card to call a part of a program for processing data to the nonvolatile memory. Volatile memory for storing data;
Of the programs that interpret and execute instructions, the remaining programs except for some programs for processing data in the nonvolatile memory are stored in advance, and the data is processed in the specific area in the nonvolatile memory The non-volatile memory in which a part of the program is converted into a state different from the original state and stored in advance,
When an instruction is input from the outside, a part of the program for processing data for the nonvolatile memory stored in the non-volatile memory after being converted into a state different from the original state is restored to the original state. The program is expanded into a specific area of the volatile memory after being converted to the program, and a program that interprets and executes the instruction stored in the nonvolatile memory is executed, and the volatile memory is specified during the execution of the program. Processing means for executing the program by calling a part of the program for processing data to the nonvolatile memory converted into the original state stored in the area;
Comprising
Some programs for processing data in the nonvolatile memory include a program for performing a writing process for writing data input from the outside to the nonvolatile memory, and data in the nonvolatile memory. Is a program for performing read processing to read out to the outside,
The nonvolatile memory includes a program call program area,
The processing means, IC module invoking the basis of the program calling program stored program calling program in the area, part of a program for processing data to the nonvolatile memory.

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