JP5832940B2 - IC card and portable electronic device - Google Patents

Description

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

  In general, an IC card used as a portable electronic device includes a card-like main body formed of plastic or the like and an IC module embedded in the main body. The IC module has an IC chip. The IC chip has a nonvolatile memory such as an EEPROM (Electrically Erasable Programmable Read-Only Memory) or a flash ROM that can hold data even in the absence of a power source, and a CPU that executes various operations.

  When receiving a command from a processing device that processes the IC card, the IC card executes an application in accordance with the received command. Thereby, the IC card can realize various functions.

  The IC card is shut down when the power supply from the reader / writer is interrupted. For example, if the IC card is shut down during command processing, inconsistency may occur in the data memory in the IC card.

  For example, the IC card stores update data in the buffer memory, and when a command for instructing batch update is received, the update data in the buffer memory is overwritten in the data memory to prevent inconsistency of the data memory.

JP-A-7-93203

  The IC card as described above has a problem that memory inconsistency may occur when the power is shut off during the overwriting process. Further, the IC card as described above needs to perform the writing process twice for one data update command. For this reason, there exists a subject that processing time becomes long.

  Therefore, it is an object to provide an IC card and a portable electronic device that execute processing more efficiently.

  An IC card according to an embodiment includes a receiving unit that receives a command transmitted from an external device, a command processing unit that executes a process based on the command received by the receiving unit, and a process performed by the command processing unit. A transmission means for transmitting a response to the external device according to the result, a first storage means comprising a plurality of files having a data area for storing the two-sided actual data, and an effective surface of the data area A second storage unit having a two-sided management table for each file; and a third storage unit for storing a flag indicating an effective surface of the management table.

FIG. 1 is a diagram for explaining a configuration example of an IC card processing system according to an embodiment. FIG. 2 is a diagram for explaining a configuration example of an IC card according to an embodiment. FIG. 3 is a diagram for explaining an example of processing of the IC card according to the embodiment. FIG. 4 is a diagram for explaining an example of processing of an IC card according to an embodiment. FIG. 5 is a diagram for explaining an example of processing of an IC card according to an embodiment. FIG. 6 is a diagram for explaining an example of processing of the IC card according to the embodiment. FIG. 7 is a diagram for explaining an example of processing of an IC card according to an embodiment.

  Hereinafter, an IC card and a portable electronic device according to an embodiment will be described in detail with reference to the drawings.

  The portable electronic device (IC card) 20 and the processing device (terminal device) 10 that processes the IC card 20 according to the present embodiment have, for example, functions of contact communication and / or non-contact communication. Thereby, the IC card 20 and the terminal device 10 can transmit and receive data to and from each other.

FIG. 1 shows a configuration example of an IC card processing system 1 according to an embodiment.
The IC card processing system 1 includes a terminal device 10 that processes the IC card 20 and an IC card 20.

  The terminal device 10 includes a CPU 11, a ROM 12, a RAM 13, a nonvolatile memory 14, a card reader / writer 15, an operation unit 17, a display 18, and a power supply unit 19. The CPU 11, the ROM 12, the RAM 13, the nonvolatile memory 14, the card reader / writer 15, the operation unit 17, and the display 18 are connected to each other via a bus.

  The CPU 11 functions as a control unit that controls the entire terminal device 10. The CPU 11 performs various processes based on the control program and control data stored in the ROM 12 or the nonvolatile memory 14. For example, the CPU 11 transmits and receives commands and responses to and from the IC card 20 via the card reader / writer 15.

  The ROM 12 is a non-volatile memory that stores a control program and control data in advance. The RAM 13 is a volatile memory that functions as a working memory. The RAM 13 temporarily stores data being processed by the CPU 11. For example, the RAM 13 temporarily stores data to be transmitted / received to / from an external device via the card reader / writer 15. The RAM 13 temporarily stores a program executed by the CPU 11.

  The nonvolatile memory 14 includes, for example, EEPROM, FRAM (registered trademark), and the like. The nonvolatile memory 14 stores, for example, a control program, control data, an application, and data used for the application.

  The card reader / writer 15 is an interface device for communicating with the IC card 20. The card reader / writer 15 transmits / receives data to / from the IC card 20 by contact communication or non-contact communication.

  When used as an interface for contact communication, the card reader / writer 15 includes a slot in which the IC card 20 is mounted and a plurality of contact terminals connected to a contact pattern included in the IC card 20.

  When the IC card 20 is mounted in the slot, the plurality of contact terminals of the card reader / writer 15 are connected to the contact pattern of the IC card 20. Thereby, the terminal device 10 and the IC card 20 are electrically connected. The card reader / writer 15 performs power supply, clock supply, reset signal input, data transmission / reception, and the like to the IC card 20 installed in the slot.

  When used as an interface for non-contact communication, the card reader / writer 15 includes a signal processing unit that performs signal processing on data to be transmitted and received, and an antenna having a predetermined resonance frequency.

  For example, the card reader / writer 15 performs signal processing such as encoding, decoding, modulation, and demodulation on data to be transmitted and received by a signal processing unit. The card reader / writer 15 supplies the encoded and modulated data to the antenna. The antenna generates a magnetic field according to the supplied data. Thereby, the terminal device 10 can transmit data to the IC card 20 existing in the communicable range in a non-contact manner.

  Further, the antenna of the card reader / writer 15 detects a magnetic field and generates a signal according to the detected magnetic field. Thereby, the card reader / writer 15 can receive a signal in a non-contact manner. The signal processing unit demodulates and decodes the signal received by the antenna. Thereby, the terminal device 10 can acquire the original data transmitted from the IC card 20.

  The operation unit 17 includes, for example, operation keys and generates an operation signal based on an operation input by the operator. The operation unit 17 inputs the generated operation signal to the CPU. Thereby, CPU11 can perform a process based on operation inputted by an operator.

  The display 18 displays various information based on signals for displaying video input from the CPU 11 or a display processing module such as a graphic controller (not shown).

  The power supply unit 19 supplies power to each unit of the terminal device 10. For example, the power supply unit 19 receives power from a commercial power supply, converts the power into a predetermined voltage, and supplies the voltage to each unit of the terminal device 10.

FIG. 2 shows a configuration example of the IC card 20 according to one embodiment.
As shown in FIG. 2, the IC card 20 includes, for example, a rectangular main body 21 and an IC module 22 built in the main body 21. The IC module 22 includes an IC chip 23 and a communication unit 24. The IC chip 23 and the communication unit 24 are formed in the IC module 22 while being connected to each other.

  The main body 21 is not limited to a rectangular shape, and may have any shape as long as the IC module 22 in which at least the communication unit 24 is disposed can be installed.

  The IC chip 23 includes a communication unit 24, a CPU 25, a ROM 26, a RAM 27, a nonvolatile memory 28, a power supply unit 31, a logic unit 32, and the like. The communication unit 24, the CPU 25, the ROM 26, the RAM 27, the nonvolatile memory 28, the power supply unit 31, and the logic unit 32 are connected to each other via a bus.

  The communication unit 24 is an interface for communicating with the card reader / writer 15 of the terminal device (external device) 10. The communication unit 24 transmits / receives data to / from the terminal device 10 by contact communication or non-contact communication.

  When used as an interface for contact communication, the communication unit 24 includes a contact pattern connected to a contact terminal of the card reader / writer 15. The contact pattern is a contact terminal formed on the surface of the IC module 22 with a conductive metal or the like. That is, the contact pattern is formed so as to be in contact with the terminal device 10.

  The contact pattern is formed by dividing a surface formed of metal into a plurality of areas. Each divided area functions as a terminal. The communication unit 24 can transmit / receive data to / from the card reader / writer 15 via the contact pattern.

  When used as an interface for non-contact communication, the communication unit 24 includes a signal processing unit and an antenna.

  The signal processing unit performs signal processing such as encoding and load modulation on data to be transmitted to the terminal device 10. For example, the signal processing unit modulates (amplifies) data to be transmitted to the terminal device 10. The signal processing unit supplies the signal-processed data to the antenna.

  The antenna is constituted by, for example, a metal wire disposed in a predetermined shape in the IC module 22. The IC card 20 generates a magnetic field by an antenna according to data transmitted to the terminal device 10. Thereby, the IC card 20 can transmit data to the terminal device 10. Further, the IC card 20 recognizes data transmitted from the terminal device 10 based on an induced current generated in the antenna by electromagnetic induction.

  For example, the signal processing unit demodulates and decodes the induced current generated in the antenna. For example, the signal processing unit analyzes a signal received by the antenna. As a result, the communication unit 24 acquires binary logical data. The communication unit 24 transmits the analyzed data to the CPU 25 via the bus.

  The CPU 25 functions as a control unit that controls the entire IC card 20. The CPU 25 performs various processes based on the control program and control data stored in the ROM 26 or the nonvolatile memory 28. For example, various processes are performed in accordance with commands received from the terminal device 10 and data such as responses as processing results is generated.

  The ROM 26 is a non-volatile memory that stores a control program and control data in advance. The ROM 26 is incorporated in the IC card 20 in a state where a control program, control data, and the like are stored at the manufacturing stage. That is, the control program and control data stored in the ROM 26 are incorporated in advance according to the specifications of the IC card 20.

  The RAM 27 is a volatile memory that functions as a working memory. The RAM 27 temporarily stores data being processed by the CPU 25. For example, the RAM 27 temporarily stores data received from the terminal device 10 via the communication unit 24. The RAM 27 temporarily stores data to be transmitted to the terminal device 10 via the communication unit 24. Furthermore, the RAM 27 temporarily stores a program executed by the CPU 25.

  The non-volatile memory 28 includes a non-volatile memory capable of writing and rewriting data, such as an EEPROM or a flash ROM. The nonvolatile memory 28 stores a control program and various data according to the usage application of the IC card 20.

  For example, in the nonvolatile memory 28, a program file and a data file are created. A control program and various data are written in each created file. The CPU 25 can implement various processes by executing programs stored in the nonvolatile memory 28 or the ROM 26.

  The power supply unit 31 supplies power to each unit of the terminal device 10. When the IC card 20 has a configuration for performing contact communication, the power supply unit 31 supplies power supplied from the card reader / writer 15 to each unit of the IC card 20 via the contact pattern of the communication unit 24.

  In addition, when the IC card 20 has a configuration for performing contactless communication, power is generated based on radio waves transmitted from the antenna of the card reader / writer 15, particularly carrier waves. Furthermore, the power supply unit 31 generates an operation clock. The power supply unit 31 supplies the generated power and operation clock to each unit of the IC card 20. Each unit of the IC card 20 becomes operable when supplied with power.

  The logic unit 32 is an arithmetic unit that performs arithmetic processing by hardware. For example, the logic unit 32 performs processes such as encryption, decryption, hash calculation, and random number generation based on a command from the terminal device 10. For example, when receiving a mutual authentication command from the terminal device 10, the logic unit 32 executes a calculation process related to the mutual authentication process.

  The IC card 20 is issued by primary issue and secondary issue. An issuing device that issues the IC card 20 initializes the nonvolatile memory 28 of the IC card 20 by transmitting a command (initialization command) to the IC card 20 in the primary issue. Accordingly, the terminal device 10 defines a key file, a data file, and the like corresponding to the purpose of use and use of the IC card 20 in the nonvolatile memory 28 of the IC card 20.

  For example, the issuing device creates a file structure defined in ISO / IEC7816 in the nonvolatile memory 28. The nonvolatile memory 28 that has been initialized includes a master file (MF), a dedicated file (DF), and an elementary file (EF).

  The MF is a file that is the basis of the file structure. The DF is created below the MF. The DF is a file that stores applications and data used for the applications in groups. EF is created below DF. The EF is a file for storing various data. In some cases, an EF is placed directly under the MF.

  There are various types of EFs, such as a Working Elementary File (WEF) and an Internal Elementary File (IEF). The WEF is a working EF and stores personal information and the like. The IEF is an internal EF and stores data such as an encryption key for security.

  In the secondary issue, individual data such as customer data is stored in the EF. Thereby, the IC card 20 becomes operable. That is, the CPU 25 can implement various processes by executing programs stored in the nonvolatile memory 28 or the ROM 26.

  For example, as illustrated in FIG. 3, the nonvolatile memory 28 includes a storage area 28 a that stores an MF and a plurality of EFs. FIG. 3 shows an example of the configuration (file tree) of the files included in the storage area 28a. The storage area 28a will be described as having a configuration having MF and EF1, EF2, and EF3 below MF.

FIG. 4 shows a specific example of the storage area 28a.
As shown in FIG. 4, the storage area 28a includes system common information, MF file management information, EF1 file management information, EF2 file management information, and EF3 file management information. The storage area 28a includes a data area for storing actual data of EF1, EF2, and EF3. Each EF data area is divided into two planes. That is, each EF includes a first data area and a second data area. The active side of the EF first data area and the second data area is referred to as an active surface.

  Further, the system common information includes a table switching flag, a management table 1 (first management table), and a management table 2 (second management table). The table switching flag indicates which of the management table 1 and the management table 2 is valid (active). The management table 1 and the management table 2 indicate which is valid (active surface) in the first data area and the second data area for each EF.

  The RAM 27 of the IC card 20 includes a storage area for storing an update start flag. The update start flag is a flag indicating whether or not an update process is being executed.

FIG. 5 shows an example of EF1 file management information, EF2 file management information, and EF3 file management information.
The management information of each EF has a file ID, file type, file size, first data area address, and second data area address. The file ID is an identification number assigned to each EF. The file type indicates the type of EF. The file size indicates the size of the data area of the EF. In this case, the file size indicates the size of the first data area or the second data area of the EF. The address of the first data area indicates the position of the first data area of the EF. The address of the second data area indicates the position of the second data area of the EF.

  When reading data from the EF, the CPU 25 of the IC card 20 refers to the management table indicated as active indicated by the table switching flag. Thereby, the CPU 25 recognizes which is the active surface between the first data area and the second data area of the EF to be read out of the management table referred to. The CPU 25 refers to the management information of the EF and reads the address of the data area on the active surface. The CPU 25 can read the data on the active surface by accessing the read address.

  FIG. 6 shows a specific example of the transition of data stored in the storage area 28a. FIG. 7 shows an example of processing of the IC card 20. In this example, the IC card 20 receives commands in the order of the data update command 1 (first data update command), the data update command 2 (second data update command), and the batch update command. The data update command indicates a command that changes data in the EF data area, such as a write command, an overwrite command, an additional write command, or a delete command.

  As shown in FIG. 6, the storage area 28a before the start of processing is “update start flag = OFF” and “data switching flag = management table 1”. Further, the management table 1 has “EF1 = data area 1”, “EF2 = data area 2”, and “EF3 = data area 3”. In addition, the management table 2 has “EF1 = data area 1”, “EF2 = data area 1”, and “EF3 = data area 2”.

  EF1 is “data area 1 = 0000 0000” and “data area 2 = FFFF FFFF”. EF2 is “data area 1 = FF FFFF FFFF” and “data area 2 = FF FFFF FFFF”. EF3 is “data area 1 = 00 0000” and “data area 2 = FF FFFF”.

  When the storage area 28 a has such data, the active management table is the management table 1. The active surface of EF1 is “data area 1 = 0000 0000”. The active surface of EF2 is “data area 2 = FF FFFF FFFF”. The active surface of EF3 is “data area 1 = 00 0000”.

  Processing when the data update command as described above is received in this state will be described with reference to FIG.

  When power is supplied from the terminal device 10, the IC card 20 is activated and enters an idle state. First, the CPU 25 of the IC card 20 initializes the RAM 27 (step S11). That is, at this time, the update start flag in the RAM 27 is in an initial state (OFF).

  Furthermore, the IC card 20 transmits ATR (Answer to Reset) to the terminal device 10 (step S12). Further, the IC card 20 waits for reception of a command (step S13).

  When receiving the command, the IC card 20 determines whether or not the received command is a batch update command (step S14). That is, the CPU 25 analyzes the received command and determines whether or not the command type (INS) of the received command indicates a batch update command.

  If the received command is not a batch update command, the CPU 25 determines whether the received command is a data update command (step S15). That is, the CPU 25 determines whether or not the command type (INS) of the received command indicates a data update command.

  If the received command is a data update command, the CPU 25 determines whether or not the update start flag on the RAM 27 is OFF (step S16). When the update start flag is OFF, the CPU 25 switches the update start flag on the RAM 27 to ON (step S17). If the update start flag is ON, the CPU 25 proceeds to the process of step S19.

  Further, the CPU 25 copies the management table (step S18). The CPU 25 copies the active management table to the invalid side (passive) management table. In the example shown in FIG. 6, the management table 1 is active. In this case, the CPU 25 copies the management table 1 to the management table 2. Thereby, the CPU 25 rewrites the active surface of EF1 of the management table 2 to the data region 1, the active surface of EF2 to the data region 2, and the active surface of EF3 to the data region 1, respectively.

  Further, the CPU 25 executes command processing according to the received data update command (step S19). In this case, the CPU 25 executes data update processing for the inactive surface (passive surface) of the EF designated by the command.

  The data update command 1 received by the IC card 20 will be described as a command for rewriting EF1 to “1111 1111”. The active data management table is the management table 1. The active surface of EF1 is the data area 1. That is, the passive surface of EF1 is the data area 2. In this case, the CPU 25 rewrites the data area 2 that is the passive surface of the EF 1 to “1111 1111”.

  The CPU 25 determines whether or not the command processing has been normally completed (step S20). When the process is normally completed, the CPU 25 updates the management table on the passive side (step S21). That is, the CPU 25 switches the data area where the data update process has been performed from the passive surface to the active surface. That is, the CPU 25 switches the passive surface of the EF that has been subjected to the data update process of the passive management table to the active surface. According to the example of FIG. 6, the CPU 25 switches the active surface of the EF 1 in the management table 2 from the data area 1 to the data area 2.

  On the other hand, if the CPU 25 determines in step S20 that the command processing has not ended normally, the process proceeds from step S20 to step S22.

  CPU25 produces | generates a status word (SW) according to the result of command processing, produces | generates the response containing SW, transmits to the terminal device 10 (step S22), and complete | finishes a process. In this case, the IC card 20 again shifts to an idle state where it waits for reception of a command.

Here, when the data update command 2 for rewriting EF2 to “22 2222 2222” is received, the CPU 25 performs the same processing as the above steps S17 to S22. That is, the CPU 25 writes data to the passive surface of the EF 2 indicated by the management table 1 that is an active data management table. As a result, the CPU 25 rewrites the data area 1 of the EF 2 to “22 2222 2222”. Further, the CPU 25 rewrites the active surface of the EF 2 in the management table 2 from the data area 2 to the data area 1.

  If it is determined in step S14 that the batch update command has been received, the CPU 25 determines whether or not the update start flag on the RAM 27 is ON (step S23). When the update start flag on the RAM 27 is OFF, the CPU 25 proceeds to step S22 and ends the process. When the update start flag is ON, the update start flag indicates that data update processing has been executed so far. The CPU 25 performs a process of reflecting all the results of the data update process.

  When the update start flag is ON, the CPU 25 updates the table switching flag (step S24). As a result, the CPU 25 activates the passive management table information. That is, the CPU 25 switches the table switching flag so that the management table 2 becomes active.

  Further, the CPU 25 switches the update start flag on the RAM 27 to OFF (step S25). CPU25 transmits a response to terminal unit 10 according to a processing result, and ends processing.

  If it is determined in step S15 that the received command is not a data update command, the CPU 25 executes processing according to the received command (step S26), and proceeds to step S22.

  By the processing as described above, the storage area 28a is in a state as shown in the rightmost column of FIG. In this case, the active management table is the management table 2. The management table 2 indicates that the active surface of EF1 is the data region 2, the active surface of EF2 is the data region 1, and the active surface of EF3 is the data region 1.

  As described above, the non-volatile memory of the IC card 20 includes the two-sided file, the two management tables indicating the active side of the two-sided file, and the active of the two management tables. And flag information indicating a management table. When the IC card 20 receives the data update command, the IC card 20 writes data to the inactive side of the doubled file and updates the inactive management table. Further, the IC card 20 switches the active management table when receiving the batch update command.

  According to such a configuration, for example, when the data update commands 1 and 2 are executed and the power is turned off before receiving the batch update command, the active management table is in the same state as before the processing. That is, the active information in the storage area 28a of the non-volatile memory 28 of the IC card 20 is in a rollback state that has not been rewritten before processing. For this reason, the process for correcting the memory at the time of restart is unnecessary.

  Thereby, for example, even when it is necessary to guarantee the consistency of data between a large number of EFs, the consistency of the file in the nonvolatile memory 28 is ensured regardless of the restriction on the size of the commit buffer. Can do.

  Thereby, the IC card 20 can hold both data before and after rewriting before the batch update. For this reason, the IC card 20 can prevent inconsistency in the nonvolatile memory 28.

  Further, according to the above configuration, the IC card 20 can complete the batch update process by switching the flag information. As a result, it is possible to suppress the possibility of power interruption or the like during the batch update process.

Further, the IC card 20 can use the data written according to the data update command as it is as the active surface of the non-volatile memory 28 after processing. For this reason, there is no need to write the write data twice. As a result, the processing time can be shortened. As a result, an IC card and a portable electronic device that perform processing more efficiently can be provided.

  In the above-described embodiment, it is assumed that the data update command is a binary command such as an UPDATE BINARY command. Here, if data does not match between the data area 1 and the data area 2 of the EF at the start of the data update process, inconsistency may occur in the processed data. Therefore, when the IC card 20 determines in step S15 in FIG. 7 that the received command is a data update command and a binary command, the data area of the active surface is updated before the data is updated in step S19. The data may be copied to the data area of the passive surface. This prevents data from becoming inconsistent after processing.

  In the above-described embodiment, the IC card 20 has been described as a configuration including a two-sided EF data area. However, the present invention is not limited to this configuration. The IC card 20 may be configured to include a double-sided DF data area or a double-sided MF data area. In such a case, the storage area 28a of the nonvolatile memory 28 of the IC card 20 includes a data area 1 and a data area 2 for storing DF or MF actual data. Further, the storage area 28a is provided with a management table indicating the effective planes in the data area 1 and the data area 2 in a doubled state. Furthermore, the storage area 28a further includes a flag indicating an effective surface of the management table.

  It should be noted that the functions described in the above embodiments are not limited to being configured using hardware, but can be realized by causing a computer to read a program describing each function using software. Each function may be configured by appropriately selecting either software or hardware.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

  DESCRIPTION OF SYMBOLS 1 ... IC card processing system, 10 ... Terminal device, 11 ... CPU, 12 ... ROM, 13 ... RAM, 14 ... Non-volatile memory, 15 ... Card reader / writer, 17 ... Operation part, 18 ... Display, 19 ... Power supply part, DESCRIPTION OF SYMBOLS 20 ... IC card, 21 ... Main body, 22 ... IC module, 23 ... IC chip, 24 ... Communication part, 25 ... CPU, 26 ... ROM, 27 ... RAM, 28 ... Non-volatile memory, 28a ... Storage area, 31 ... Power supply Part, 32 ... logic part,

Claims (9)

Receiving means for receiving a command transmitted from an external device;
Command processing means for executing processing based on the command received by the receiving means ;
Transmission means for transmitting a response to the external device according to the processing result by the command processing means;
First storage means comprising a plurality of files having a data area for storing the two-sided real data;
A second storage means comprising a two-sided management table indicating the effective area of the data area for each file;
Third storage means for storing a flag indicating an effective surface of the management table;
IC card comprising:   When the command processing means receives a data update command by the receiving means, the command processing means recognizes the invalid side of the data area and the invalid side of the management table based on the flag and the management table, and invalidates the data area. The IC card according to claim 1, wherein data corresponding to a command is written to a surface to update an invalid surface of the management table.   The IC card according to claim 2, wherein the command processing unit switches the invalid side of the management table to a valid side when receiving the batch update command by the receiving unit.   When the command received by the receiving means is a data update command and a binary command, the command processing means copies the data in the valid area of the data area to the invalid face, and sets the invalid area in the data area. The IC card according to claim 3, wherein data corresponding to the command is written. Comprising a fourth storage means for storing an update start flag;
When the command processing means starts command processing corresponding to the data update command with the update start flag being OFF, the command processing means switches the update start flag to ON and completes command processing corresponding to the batch update command. If the update start flag is switched off,
The IC card according to claim 3 .   6. The IC card according to claim 5, wherein the command processing means copies the management table from the valid surface to the invalid surface when the update start flag is switched to ON.   The command processing means, when receiving a read command by the receiving means, recognizes an effective surface of the data area based on the flag and the management table, and reads data of an effective surface of the data area. 1. The IC card according to 1. An IC module comprising the receiving means, the command processing means, the transmitting means, the first storage means, the second storage means, and the third storage means ;
A main body on which the IC module is disposed;
The IC card according to claim 1, comprising: Receiving means for receiving a command transmitted from an external device;
Command processing means for executing processing based on the command received by the receiving means ;
Transmission means for transmitting a response to the external device according to the processing result by the command processing means;
First storage means comprising a plurality of files having a data area for storing the two-sided real data;
A second storage means comprising a two-sided management table indicating the effective area of the data area for each file;
Third storage means for storing a flag indicating an effective surface of the management table;
A portable electronic device comprising:

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