JP2007267006A - Information protecting system, portable terminal, information medium, information protecting method, and information protecting program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To automatically protect information stored in a portable terminal to be used after attaching an information medium, and information stored in the attached information medium. <P>SOLUTION: A combination between a portable terminal and an information medium used for the portable terminal is decided, and an operation of accessing private information by each person is locked in combinations other than the decided combination. For example, the identification information of an SIM card used by the owner is stored into a cellular phone in advance. When power is supplied, the cellular phone checks the identification information of the inserted SIM card with the registered identification information, and if the identification information does not match, the cellular phone executes terminal locking. Similarly, the identification information of a cellular phone to be used by the owner is stored in the SIM card in advance. When attached and supplied with power, the SIM card checks the identification information of a cellular phone of the attaching destination with the registered identification information, and if the identification information does not match, the SIM card executes card locking. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an information protection system, an information protection method, and an information protection program for protecting information stored in a mobile terminal, and in particular, protects information stored in a mobile terminal that can be used with an information medium attached. The present invention relates to an information protection system, an information protection method, and an information protection program. The present invention also relates to a portable terminal and an information medium using the information protection method.

  In recent years, leakage of personal information and crimes that occur based on leaked personal information have become a problem. In addition, since a mobile phone can record a great deal of information such as a phone number, an e-mail address, an address, a face photo, etc., if it is lost, so much information will be leaked.

  As a conventional method for preventing information leakage of a mobile phone, for example, there is a lock function by remote operation performed when the mobile phone is lost. For example, Patent Document 1 describes a mobile phone that locks a mobile phone by checking a SIM (Subscriber Identity Module) card and a PIN (Personal Identification Number) code. The mobile phone described in Patent Document 1 responds to any combination of a user protection input signal such as a SIM card signal, a personal identification input signal such as a PIN code signal, and a communication control signal such as a remote control message signal. Lock the mobile phone.

JP 2002-077372 (paragraphs 0009-0013)

  The lock function by remote control restricts the transmission of a mobile phone and the browsing of stored information when, for example, an incoming call or electronic mail that satisfies a predetermined condition is received. FIG. 6 shows an example of a processing flow of the lock function by remote control of the mobile phone. As shown in FIG. 6, for example, by dialing a predetermined number of times within a predetermined time from a predetermined telephone number, dial lock (operation of the mobile phone is not accepted until a password is entered) is performed. Can be considered.

  However, such a lock function by remote operation has a problem that the remote operation is not performed until the owner notices the loss. In addition, even if the owner notices the loss, there is a problem that personal information stored in the mobile phone is accessed if remote control cannot be performed.

  For example, in a state where the power is turned off by the finder, even if the owner knows that it is lost and tries to perform a remote operation, the signal for remote control cannot be received. Accordingly, if the power is turned on after being left in this state for a while, even if the owner stops the mobile phone usage contract, personal information stored in the mobile phone may be leaked.

  In addition, many of the conventional information leakage prevention methods for mobile phones are not considered in the case of using an information medium storing personal information such as a SIM card.

  In the mobile phone described in Patent Document 1, the mobile phone can be locked by checking the SIM card and the PIN code. However, depending on the combination of the mobile phone and the SIM card, it is stored in the mobile phone or the SIM card. Personal information may be leaked.

  For example, if a SIM card is removed and another SIM card (eg, the finder's SIM card) is inserted, the PIN code may be recognized even if the owner's SIM card is not known as known by the mobile phone. If is correctly input, there is a possibility that personal information stored in the mobile phone can be accessed. Moreover, when the SIM card is replaced, the mobile phone has a line different from the line recognized by the owner, so even if the mobile phone has a remote control function, The remote control signal does not reach and the mobile phone cannot be locked.

  Further, in the lock function by remote control of the mobile phone and the mobile phone described in Patent Document 1, there is a possibility that personal information stored in the SIM card may leak. For example, the personal information stored in the owner's SIM card can be leaked by the finder removing the SIM card and inserting it into another mobile phone that does not have a remote control function or is not set for remote control. There is sex. In addition, there is a possibility that a device that reads information stored in the SIM card is intentionally used instead of the mobile phone.

  Therefore, the present invention is capable of automatically protecting information stored in a portable terminal that can be used in a state where the information medium is mounted and information stored in the mounted information medium. Objective.

  An information protection system according to the present invention is an information protection system for protecting information stored in a portable terminal that can be used in a state in which a predetermined information medium is mounted, and the portable terminal includes a mounting unit on which the information medium is mounted. (For example, SIM card I / F unit 11), an information medium identification information storage unit (for example, storage unit 23) for storing information medium identification information for identifying an information medium, and an information medium mounted on the mounting unit Are stored in an information medium identification information acquisition unit (for example, the SIM card I / F unit 11 and the control unit 21) that reads from the information medium and an information medium identification information storage unit. The information stored in the portable terminal is accessed only when the information medium identification information matches the information medium identification information read from the information medium by the information medium identification information acquisition unit. Terminal control unit for controlling the enable state (e.g., control unit 21) and having a.

  In addition, when the information medium is not attached, the terminal control unit may cause the portable terminal to shift to a state where the information stored in the information medium cannot be accessed. Here, “transition to an inaccessible state” means, for example, that the power is forcibly turned off, or operations other than power-off and operations other than emergency incoming / outgoing calls are not accepted.

  In addition, if the information medium identification information is not stored in the information medium identification information storage unit, the terminal control unit registers the information medium identification information read from the currently mounted information medium in the information medium identification information storage unit. Registration means may be included.

  The terminal control unit may include an erasing unit that erases the information medium identification information stored in the information medium identification information storage unit when a predetermined dedicated device is attached to the portable terminal.

  In addition, the information protection system includes a second information medium attached to the portable terminal, and the portable terminal stores a second information medium identification information storage for storing information medium identification information for identifying the second information medium. And a second information medium identification information acquisition unit that reads information medium identification information stored in advance in a second information medium attached to the portable terminal from the second information medium. When the information medium identification information stored in the second information medium identification information storage unit matches the information medium identification information read from the second information medium by the second information medium identification information acquisition unit In addition, a second erasing unit for erasing the information medium identification information stored in the information medium identification information storage unit may be included.

  In addition, the information medium includes a terminal identification information storage unit that stores terminal identification information for identifying a portable terminal, a terminal identification information acquisition unit that acquires terminal identification information stored in advance in the portable terminal of the mounting destination, The information stored in the information medium can be accessed only when the terminal identification information stored in the terminal identification information storage unit matches the terminal identification information acquired from the mobile terminal by the terminal identification information acquisition unit. And an information medium control unit that controls the state. Here, “acquire terminal identification information” means, for example, that the terminal identification information output from the portable terminal is received by causing the portable terminal to output the terminal identification information as part of a predetermined activation sequence. It is to be. Specifically, terminal identification information included in a control signal output from the mobile terminal may be extracted.

  Further, the terminal identification information acquisition unit may acquire the terminal identification information from the mobile terminal by extracting the terminal identification information included in the control signal transmitted from the mobile terminal.

  The portable terminal according to the present invention is a portable terminal that can be used in a state in which a predetermined information medium is mounted, and includes a mounting portion on which the information medium is mounted and information medium identification information for identifying the information medium. An information medium identification information storage unit to be stored, an information medium identification information stored in advance in an information medium mounted on the mounting unit, an information medium identification information acquisition unit that reads from the information medium, and an information medium identification information storage unit The information stored in the portable terminal is controlled so that the information can be accessed only when the information medium identification information that has been read matches the information medium identification information read from the information medium by the information medium identification information acquisition unit. And a terminal control unit.

  An information medium according to the present invention is an information medium that is attached to a predetermined portable terminal, and stores in advance a terminal identification information storage unit that stores terminal identification information for identifying the portable terminal, and a portable terminal that is the attachment destination. The terminal identification information acquisition unit for acquiring the stored terminal identification information, the terminal identification information stored in the terminal identification information storage unit, and the terminal identification information acquired from the portable terminal by the terminal identification information acquisition unit match. Only in this case, an information medium control unit that controls the information stored in the information medium so as to be accessible is provided.

  An information protection method according to the present invention is an information protection method for protecting information stored in a mobile terminal that can be used in a state where a predetermined information medium is attached, and the mobile terminal is attached to the mobile terminal. Reading information medium identification information for identifying the information medium stored in advance from the information medium, information medium identification information stored in the portable terminal, and information medium read from the information medium And a step of controlling the information stored in the portable terminal so as to be accessible only when the identification information matches.

  In addition, a step of acquiring terminal identification information for identifying a portable terminal, in which an information medium attached to the portable terminal is stored in advance in the portable terminal of the attachment destination, and terminal identification information stored in the information medium And a step of controlling the information stored in the information medium so as to be accessible only when the terminal identification information acquired from the mobile terminal matches.

  An information protection program according to the present invention is an information protection program for protecting information stored in a mobile terminal that is mounted on a mobile terminal that can be used with a predetermined information medium mounted thereon. , Processing for reading information medium identification information stored in advance in an information medium mounted on the portable terminal from the information medium, information medium identification information stored in the portable terminal, and information medium read from the information medium Only when the identification information matches, the process for controlling the information stored in the portable terminal to be accessible is executed.

  According to the present invention, identification information of an information medium used by being attached to the portable terminal is stored in the portable terminal, and the terminal control unit is configured to store the identification information stored and the attached information medium. When the acquired identification information matches, the information stored in the mobile terminal is changed to an accessible state. Therefore, the personal information stored in the mobile terminal when used in a combination other than the combination assumed by the owner. Information cannot be accessed and leakage of personal information due to unauthorized use can be prevented.

  In addition, according to the present invention, identification information of a mobile terminal that is mounted and used is also stored in an information medium that is mounted on the mobile terminal, and the information medium control unit stores the stored identification information, When the identification information acquired from the mobile terminal of the attachment destination matches, the information stored in the information medium is shifted to accessible information. For example, even if the mobile terminal body is extracted, the information is extracted. Personal information stored in an information medium can be protected.

  The present invention defines a combination of a mobile terminal and an information medium used for the mobile terminal, and locks an operation that each accesses personal information when the combination is other than the predetermined one. In order to prevent leakage of personal information during unauthorized use. In the present embodiment, an information protection system that protects personal information stored in a mobile phone used with a SIM card and personal information stored in the attached SIM card, taking a mobile phone and a SIM card as an example. explain. The information protection system according to the present embodiment will be described by taking as an example a case where the mobile phone 1 shown in FIG. 1 and the SIM card 3 shown in FIG. 2 are used in combination.

  FIG. 1 is a block diagram illustrating a configuration example of a mobile phone according to the present embodiment. FIG. 1 shows important elements in the present invention among the components of the cellular phone. As shown in FIG. 1, the mobile phone includes a SIM card I / F unit 11, a control unit 21, an operation unit 22, a storage unit 23, a display unit 24, and a power supply unit 25.

  The SIM card I / F unit 11 is an input / output interface for a SIM card that interfaces with the SIM card, including a card slot for inserting the SIM card. The SIM card I / F unit 11 interfaces with the SIM card according to an instruction from the control unit 21. More specifically, information stored in the SIM card is read and information is written to the SIM card by inputting / outputting control signals to / from the SIM card according to a predetermined protocol.

  The control unit 21 is a CPU or the like that operates according to a control program, and performs overall control of the mobile phone. Specifically, the control unit 21 receives a notification of power ON / OFF from the power supply unit 25 or an operation input notification from the operation unit 22, and operates the operation unit 22, the storage unit 23, the display unit 24, and the power supply unit. By controlling 25, the startup process and various processes according to the operation are performed. In the present embodiment, the control unit 21 performs a combination check with the SIM card inserted when the power is turned on, and also performs a control to disable a predetermined operation when the combination is not a predetermined combination. .

  The operation unit 22 is an input device that inputs a key signal, for example. The memory | storage part 23 is memory | storage devices, such as memory, Comprising: Various information, such as terminal identification information for identifying a terminal, a telephone directory, and the information which a user wants to save, is memorize | stored. In the present embodiment, SIM card identification information for identifying the SIM card that is the combination partner is stored.

  The display unit 23 is a display device such as an LCD and displays information to the user. The power supply unit 25 controls the power supply system of the mobile phone.

  FIG. 2 is a block diagram showing a configuration example of the SIM card in the present embodiment. FIG. 2 shows important elements in the present invention among the components of the SIM card. As shown in FIG. 2, the SIM card includes a control unit 31, a storage unit 32, and a SIM card slot I / F unit 33.

  The control unit 31 is a CPU or the like that operates according to a control program, and controls the entire SIM card. Specifically, information stored in the storage unit 32 is read or written according to an access request sent via the input / output interface unit 33. In the present embodiment, in addition to the normal access control, a combination check with the attached mobile terminal is performed, and if the combination is other than a predetermined combination, control for preventing a predetermined operation is performed.

  The storage unit 32 is a storage device such as a RAM, a ROM, or an EEPROM, and stores various types of information such as key information used for access control and personal information used by a mobile phone. In the present embodiment, terminal identification information for identifying a mobile phone to be combined is stored.

  The input / output interface unit 33 is an input / output interface for a SIM card slot that interfaces with a SIM card slot provided in a mobile phone or the like. The input / output interface unit 33 inputs / outputs a control signal for receiving power supply from the main device or reading / writing information, for example.

  In the present embodiment, a SIM card is shown as an example of an information medium from which information is read from the mobile terminal, and is not limited to a SIM card. For example, as long as it has unique identification information, can register terminal identification information in a predetermined format, and can operate a predetermined control logic, it is not limited to an IC card and is a plug-in type information medium. Also good. The mobile phone may be a mobile terminal such as a PDA or a personal computer.

  Next, the operation of the present embodiment will be described with reference to FIGS. FIG. 3 is a flowchart showing a processing flow at the time of activation of the mobile phone in the present embodiment. FIG. 4 is a flowchart showing a processing flow at the time of activation of the SIM card in the present embodiment.

  First, the operation of the mobile phone will be described. In the prior art, for example, even if the mobile phone has a lock function by remote control as shown in FIG. Remote operation may not be possible for some reason. In such a case, it cannot be locked, and leakage of personal information due to unauthorized use cannot be prevented. In the present invention, a lock function is added to the mobile phone so that information stored in the mobile phone and the SIM card cannot be referred to other than in combination with a predetermined SIM card.

  As shown in FIG. 3, first, when the mobile phone starts to be supplied with power, it retrieves SIM card identification information stored in the mobile phone (steps S101 and S102). For example, the control unit 21 of the mobile phone takes out the SIM card identification information by referring to the SIM card identification information stored in the storage unit 23 of the mobile phone. Note that there is a possibility that the SIM card identification information is not stored in the storage unit 23. For this reason, the control unit 21 may fail to read the SIM card identification information from the storage unit 23. Therefore, the control unit 21 checks whether or not SIM card identification information is stored in the storage unit 23 (step S103).

  Here, when the SIM card identification information is stored in the storage unit 23 (Yes in step S103), the control unit 21 of the mobile phone sets the currently inserted SIM based on the stored SIM card identification information. Check the combination with the card.

  The control unit 21 of the cellular phone controls the SIM card I / F unit 11 and reads the SIM card identification information from the currently inserted SIM card (step S104). For example, the control unit 21 may output a control signal indicating a request to read SIM card identification information to the SIM card in accordance with a predetermined SIM card identification information reading protocol. The SIM card may receive a control signal via the SIM card slot and output SIM card identification information stored in the storage unit 32 of the SIM card, for example. The control unit 21 of the mobile phone reads the SIM card identification information from the SIM card by receiving the SIM card identification information output from the SIM card via the SIM card I / F unit 11.

  Here, when the SIM card is not inserted into the mobile phone, or when reading of the SIM card identification information from the SIM card has failed (Yes in step S105), the mobile phone control unit 21 determines that the combination is incompatible. In order to make it impossible to access information stored in the mobile phone and the SIM card, a terminal lock process is performed (step S107). When the terminal lock process is performed, if the terminal is already set to the locked state, the control unit 21 may omit the terminal lock process and continue the lock state as it is.

  As the terminal lock process, for example, it is conceivable to control the power supply unit 25 so that the power cannot be turned on to forcibly turn off the power. Alternatively, a predetermined lock operation may be performed after a message indicating that the identification information cannot be read from the SIM card is displayed on the display unit 24. As the locking operation, for example, it is conceivable to control the operation unit 22 so as not to accept all operations other than the power OFF. In addition, it is possible not to accept operations other than emergency incoming / outgoing calls, or it may be possible not to accept access operations to information registered by the user.

  If the SIM card is successfully read from the SIM card with the SIM card inserted into the mobile phone (No in step S105), the SIM card identification information read from the SIM card and the mobile phone Is compared with the SIM card identification information stored in the memory card ID to check whether the two SIM card identification information matches (step S106). If the two SIM card identification information does not match (No in step S106), the control unit 21 of the mobile phone can access the information stored in the mobile phone and the SIM card as a combination mismatch. In order to eliminate this, terminal lock processing is performed (step S107).

  For example, when the SIM card is not inserted into the mobile phone or when the reading of the SIM card identification information from the SIM card fails, the terminal lock process controls the power supply unit 25 so that the power cannot be turned on. The power supply may be forcibly turned off. Alternatively, a predetermined lock operation may be performed after a message indicating that the identification information read from the SIM card does not match is displayed on the display unit 24. FIG. 5 shows an example of the display message. FIG. 5 is an example in which a dialog indicating that a different SIM card is inserted is displayed.

  It should be noted that the terminal lock process can also store a state so that it is not released even when the power is turned off. If the registered SIM card is broken or lost, the terminal lock can be released by using a dedicated jig for releasing the lock based on the identification information, for example. For example, a device that mechanically outputs a predetermined signal is connected, and the mobile phone recognizes the signal to release the terminal lock. Alternatively, the terminal lock may be released by inserting a SIM card storing a predetermined SIM card identification number and allowing the mobile phone to recognize the identification number.

  Specifically, the control unit 21 of the mobile phone recognizes that it is connected to a dedicated jig (including a SIM card storing a predetermined SIM card identification number), and is stored in the storage unit 23. The terminal lock is released by erasing the existing SIM card identification information or temporarily not performing the combination check process. It is preferable that such a dedicated jig is used at the maintenance base of a mobile phone sales manufacturer or at a store window, and is used after authenticating the owner.

  On the other hand, when the two SIM card identification information matches (Yes in step S106), a normal activation process is performed (step S109). At this time, if the terminal lock setting remains, a terminal lock release process may be performed (step S108). Thereafter, for example, necessary information is read from the SIM card, and a normal standby operation is performed by communicating with the base station (step S110). Thereafter, all communication functions can be used if there is no problem in other check processes.

  Also, if the SIM card identification information is not stored in the mobile phone (No in step S103), the SIM card identification information is detected from the SIM card in order to recognize the currently inserted SIM card as a regular combination. May be read and stored (step S111). In such a case, new registration work can be easily performed. Thereafter, the process may be resumed from the process of retrieving the SIM card identification information from the storage unit 23 (return to step S102). Further, for example, the SIM card identification information of the SIM card may not be automatically stored, but may be stored by a seller using a dedicated jig at the time of sale. In such a case, for example, by storing a plurality of SIM card identification information in the mobile phone, a normal operation can be performed in a plurality of combinations.

  As described above, by storing SIM card identification information of a SIM card that can be attached to the mobile phone within the range assumed by the owner, the mobile phone can store the stored SIM card identification information. The terminal is automatically locked in a state other than the state where the SIM card having information is attached. For this reason, leakage of personal information stored in the mobile phone can be prevented.

  Next, the operation of the SIM card will be described. In the prior art, for example, if the SIM card is removed from the owner's mobile phone and inserted into a mobile phone that is not set for remote operation, the personal information stored in the SIM card may be illegally used. is there. In the present invention, not only the mobile phone but also the SIM card side is added with a lock function that prevents information stored in the SIM card from being referred to other than in combination with a predetermined mobile phone.

  As shown in FIG. 4, the SIM card is mounted on a mobile phone, and when the mobile phone is normally activated (steps S201 and S202), power is supplied and the following control logic operates. First, the control unit 31 of the SIM card checks whether or not the terminal identification information is stored in the storage unit 32 of the SIM card (step S203).

  When the terminal identification information is stored in the storage unit 32 (Yes in step S203), the SIM card control unit 31 determines whether the currently installed mobile phone is based on the stored terminal identification information. Check the combination.

The control unit 31 of the SIM card acquires terminal identification information set in the mobile phone from the mobile phone via the input / output interface unit 33 (step S204). Acquisition of terminal identification information from a mobile phone is, for example, part of a startup sequence performed with a mobile phone, and a protocol for outputting terminal identification information from the mobile phone is defined and output from the mobile phone What is necessary is just to acquire by receiving terminal identification information. For example, the SIM card identification information reading protocol may be determined so that the terminal identification information is included in the control signal indicating the SIM card identification information reading request output from the mobile terminal. In such a case, the SIM card control unit 31 may extract terminal identification information included in a control signal indicating a request to read SIM card identification information output from the mobile phone.

  Further, for example, according to a predetermined terminal card identification information readout protocol, a control signal indicating a terminal identification information readout request may be output from the SIM card control unit 31 to the mobile phone. The mobile phone may receive the control signal via the SIM card I / F unit and output, for example, terminal identification information stored in the storage unit 23 of the mobile phone. Then, the control unit 31 of the SIM card may acquire the terminal identification information from the mobile phone by receiving the terminal identification information output from the mobile phone via the input / output interface unit 33.

  Next, the control unit 31 of the SIM card compares the terminal identification information acquired from the mobile phone with the terminal identification information stored in the SIM card and confirms whether the two terminal identification information matches. (Step S205). Here, if the two terminal identification information does not match (No in step S205), the SIM card control unit 31 cannot access the information stored in the SIM card as a combination incompatibility. Card lock processing is performed (step S206).

  As the card lock process, for example, it may be possible not to accept all control signals required from the subsequent mobile phone. Alternatively, the subsequent control signal may be ignored after outputting a response signal indicating a combination abnormality. It should be noted that the card lock process can also store a state so that it is not released even if the power supply is stopped. If the registered mobile phone is lost, it may be released using a dedicated jig in the same way as the unlocking of the mobile phone.

  On the other hand, if the two pieces of terminal identification information match (Yes in step S205), a card lock release process is performed (step S207). Here, for the first time, it is possible to accept all access requests to information stored in the SIM card from the mobile phone. For example, a normal read request is accepted such as responding to a PIN code inquiry from a mobile phone.

  Also, if the terminal identification information is not stored in the SIM card (No in step S203), the terminal identification information is acquired from the cellular phone in order to recognize the currently installed cellular phone as an authorized combination. Then, it may be stored (step S208). In such a case, new registration work can be easily performed. Thereafter, the process may be resumed from the process of confirming the terminal identification information stored in the storage unit 32 (return to step S203). Further, for example, the terminal identification information of the mobile phone may not be automatically stored, but may be stored by a seller using a dedicated jig at the time of sale. In such a case, for example, by storing a plurality of terminal identification information in the SIM card, a normal operation can be performed in a plurality of combinations.

  As described above, the SIM card stores the terminal identification information stored in the SIM card by storing the terminal identification information of the mobile phone to which the SIM card can be mounted within the range assumed by the owner. The card access is automatically locked in a state other than the state in which the mobile phone is installed. For this reason, leakage of personal information stored in the SIM card can be prevented.

  Therefore, according to the present embodiment, information stored in a portable terminal that is used with a detachable information medium and information stored in an information medium that is mounted on the mobile phone are automatically protected. be able to.

  In the information protection system according to the present invention, not only the combination of a SIM card and a mobile phone, but also, for example, by applying to an information recording medium and a portable terminal that can read information from the information recording medium, It is possible to protect the information stored in each of the combinations other than those assumed by the person.

  Examples of the information recording medium include an SD card, a memory stick, and a multimedia card. The mobile terminal may be, for example, not only a mobile phone but also a PDA or a notebook personal computer. In such a case, the mobile terminal includes an information storage medium I / F unit that interfaces with the information storage medium instead of the SIM card I / F unit 11.

  The user sets and registers an information recording medium that is a regular combination in advance. For example, identification information of an information recording medium owned by itself is stored in advance in the mobile terminal. When the portable terminal is supplied with power, it determines whether a preset information recording medium is inserted. The portable terminal locks the terminal when a preset information recording medium is not inserted.

  In such a case, if the device is used in a combination other than the one assumed by the owner, the mobile device is locked and the information recording medium cannot be accessed. Can be prevented. In addition, the unauthorized use prevention in the regular combination is performed by comparing the authentication information (for example, password) recorded on the information recording medium with the authentication information input from the user. Can be judged.

  It is also possible to use a preset information recording medium as a release key for releasing the terminal lock by the combination check with the SIM card. For example, when power is supplied when the terminal is locked, the mobile phone determines whether a preset information recording medium is inserted, and when a preset information recording medium is inserted, The terminal lock is released by erasing the SIM card identification information stored in the storage unit 32 or by temporarily not performing the combination check process. In such a case, it is possible to easily perform a recovery operation at the time of failure or loss.

  The information recording medium used for releasing the terminal lock may be a SIM card, for example. The SIM card used for setting the terminal lock may also be another information medium (an information recording medium such as an SD card, a memory stick, or a multimedia card). That is, the information medium used for releasing the terminal lock and the information medium used for setting the terminal lock may be different types or the same type, and the information medium can interface with the portable terminal. Any combination is free.

  The present invention can be suitably applied to a portable terminal that can be loaded with an information medium and stores personal information, or an information medium that is loaded into a portable terminal and reads personal information.

FIG. 3 is a block diagram illustrating a configuration example of a mobile phone in this embodiment. The block diagram which shows the structural example of the SIM card | curd in this Embodiment. The flowchart which shows the operation example at the time of starting of a mobile telephone. Flowchart showing an example of operation when starting up a SIM card Explanatory drawing which shows the example of a display of a mobile telephone when an unexpected combination is detected. The flowchart which shows the operation example of the lock function by remote control of a mobile telephone.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mobile phone 11 SIM card I / F unit 21 Control part 22 Operation part 23 Storage part 24 Display part 25 Power supply part 3 SIM card 31 Control part 32 Storage part 33 Input / output interface part

Claims (12)

An information protection system for protecting information stored in a portable terminal that can be used in a state where a predetermined information medium is mounted,
Mobile devices
A mounting portion on which an information medium is mounted;
An information medium identification information storage unit for storing information medium identification information for identifying the information medium;
An information medium identification information acquisition unit that reads information medium identification information stored in advance in the information medium mounted on the mounting unit from the information medium;
Only when the information medium identification information stored in the information medium identification information storage unit matches the information medium identification information read from the information medium by the information medium identification information acquisition unit, is stored in the portable terminal. And a terminal control unit that controls the information to be accessible.   The information protection system according to claim 1, wherein the terminal control unit shifts the portable terminal to a state where the information stored in the information medium cannot be accessed when the information medium is not attached.   If the information medium identification information is not stored in the information medium identification information storage unit, the terminal control unit registers the information medium identification information read from the currently mounted information medium in the information medium identification information storage unit. The information protection system according to claim 1 or 2, comprising registration means.   The terminal control unit includes an erasing unit that erases information medium identification information stored in the information medium identification information storage unit when a predetermined dedicated device is attached to the portable terminal. The information protection system according to any one of the above. A second information medium mounted on the mobile terminal;
Mobile devices
A second information medium identification information storage unit for storing information medium identification information for identifying the second information medium;
A second information medium identification information acquisition unit that reads information medium identification information stored in advance in a second information medium attached to the portable terminal from the second information medium;
The terminal control unit includes information medium identification information stored in the second information medium identification information storage unit, and information medium identification information read from the second information medium by the second information medium identification information acquisition unit The information according to any one of claims 1 to 4, further comprising: a second erasing unit that erases the information medium identification information stored in the information medium identification information storage unit when Protection system. Information media
A terminal identification information storage unit for storing terminal identification information for identifying a mobile terminal;
A terminal identification information acquisition unit for acquiring terminal identification information stored in advance in the portable terminal of the attachment destination;
Only when the terminal identification information stored in the terminal identification information storage unit matches the terminal identification information acquired from the portable terminal by the terminal identification information acquisition unit, the information stored in the information medium The information protection system according to any one of claims 1 to 5, further comprising an information medium control unit configured to control the accessible state. The information protection system according to claim 6, wherein the terminal identification information acquisition unit acquires the terminal identification information from the portable terminal by extracting the terminal identification information included in the control signal transmitted from the portable terminal. A portable terminal that can be used with a predetermined information medium mounted,
A mounting portion on which an information medium is mounted;
An information medium identification information storage unit for storing information medium identification information for identifying the information medium;
An information medium identification information acquisition unit that reads information medium identification information stored in advance in the information medium mounted on the mounting unit from the information medium;
Only when the information medium identification information stored in the information medium identification information storage unit matches the information medium identification information read from the information medium by the information medium identification information acquisition unit, is stored in the portable terminal. And a terminal control unit that controls the information to be accessible. An information medium to be attached to a predetermined mobile terminal,
A terminal identification information storage unit for storing terminal identification information for identifying the portable terminal;
A terminal identification information acquisition unit for acquiring terminal identification information stored in advance in the portable terminal of the attachment destination;
Only when the terminal identification information stored in the terminal identification information storage unit matches the terminal identification information acquired from the portable terminal by the terminal identification information acquisition unit, the information stored in the information medium An information medium comprising an information medium control unit that controls to an accessible state. An information protection method for protecting information stored in a portable terminal that can be used in a state where a predetermined information medium is mounted,
A portable terminal that reads information medium identification information for identifying the information medium stored in advance in an information medium mounted on the portable terminal from the information medium;
The step of controlling the information stored in the portable terminal to be accessible only when the information medium identification information stored in the portable terminal matches the information medium identification information read from the information medium. An information protection method characterized by comprising: A step of acquiring terminal identification information for identifying the mobile terminal, wherein an information medium mounted on the mobile terminal is stored in advance in the mobile terminal of the mounting destination;
Controlling the state in which the information stored in the information medium is accessible only when the terminal identification information stored in the information medium matches the terminal identification information acquired from the mobile terminal. The information protection method according to claim 11. An information protection program for protecting information stored in a portable terminal that can be used in a state where a predetermined information medium is mounted,
On the computer,
Processing for reading information medium identification information stored in advance in an information medium mounted on the portable terminal from the information medium, information medium identification information stored in the portable terminal, and information read from the information medium An information protection program for executing a process for controlling the information stored in the portable terminal to be accessible only when the medium identification information matches.

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