JP2013131819A - Portable terminal device, security data leakage prevention method, and security data leakage prevention program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable terminal device that is capable of, when being carried out to the outside of an electric field of radio communication unauthorizedly, deleting security data stored in the portable terminal device.SOLUTION: When an electric field detection part 11 of a control part 1 detects, based on a result of electric field strength detection from a radio part 2, that a portable terminal device 10 moved from the inside of an electric field of radio communication to the outside of the electric field, a power supply control part 12 nullifies an operation for interrupting power supply from a power source of a power supply part 3 to thereby keep the power supply continuing and a timer control part 13 starts a monitoring timer that measures a lapsed time since the movement to the outside of the electric field. Then, when the lapsed time measured by the monitoring timer as a time, in which the portable terminal device 10 continuously exists outside the electric field, exceeds a predetermined certain time, a security data deletion part 14 deletes security data stored in a security data storage part 4.

Description

  The present invention relates to a portable terminal device, a security data leakage prevention method, and a security data leakage prevention program, and can be suitably applied to a business-use portable terminal device that handles business security data.

  For example, as described in Japanese Patent Application Laid-Open No. 2008-22433, “Wireless Communication System, Communication Terminal Device, and In-House Information Management Method” in Patent Document 1, a mobile terminal device has conventionally moved out of the radio communication field. In order to prevent the occurrence of an unexpected situation in which security data stored in the memory in the mobile terminal device leaks to the outside when it is detected, the stored contents in the memory in the mobile terminal device are deleted. It has a mechanism to do.

  However, if the power of the mobile terminal device is turned off (shut off), the software that deletes the stored content of the memory cannot operate, and the stored content stored in the memory of the mobile terminal device is deleted. It is common not to be able to. Further, even when the power is turned off (shut off), the security data held in the nonvolatile memory is not physically erased, so there is a possibility that the security data leaks.

  Also, outside the communication range, there is a method of turning off (shutting down) the power of the mobile terminal device so that the mobile terminal device is not activated. Similarly, in the state where the power is turned off, it is non-volatile. Since the data physically held in the memory is held as it is for a long time, there is a possibility that information such as security data may be leaked if the non-volatile memory is transferred to another device or the like. there were.

JP 2008-22433 A (page 5-7)

  As described above, in the prior art, even if the wireless communication is moved out of the electric field, security data may remain in the mobile terminal device and the security data may be leaked to the outside. was there.

  In general, in the case of a mobile terminal device used for business purposes, security data stored in a memory in the mobile terminal device is encrypted and stored. However, there are many cases where encryption / decryption keys for encryption / decryption are stored in the memory in the portable terminal device, and the entire portable terminal device is stolen and the encryption / decryption key stored in the memory is stored. When analyzed, the security data encrypted and stored can be decrypted, and the security data can be stolen.

(Object of the present invention)
The present invention has been made in view of such circumstances, and when a mobile terminal device is illegally taken out of the field of wireless communication, the security data stored in the mobile terminal device is deleted (erased). An object of the present invention is to provide a portable terminal device, a security data leakage prevention method, and a security data leakage prevention program that can reliably perform the above.

  In order to solve the above-described problems, the portable terminal device, the security data leakage prevention method, and the security data leakage prevention program according to the present invention mainly adopt the following characteristic configuration.

  (1) A mobile terminal device according to the present invention is a mobile terminal device that performs wireless communication, in which security data that requires confidentiality is stored in a non-volatile memory, and detects that it has moved out of the field of wireless communication In this case, the operation to cut off the power supply from the power supply is set to be invalid, the power supply is continuously maintained, and a monitoring timer that measures the elapsed time after moving out of the electric field is started, and accordingly After that, if the elapsed time counted by the monitoring timer as a duration that existed outside the electrosphere exceeds a predetermined time that is allowed as a permissible time range that allows it to exist outside the electrosphere, the non-volatile The security data stored in the memory is deleted.

  (2) A security data leakage prevention method according to the present invention is a security data leakage prevention method in a portable terminal device that performs wireless communication in which security data requiring confidentiality is stored in a non-volatile memory. When it is detected that it has moved from the communication field to the outside of the field, the operation that cuts off the power supply from the power supply is disabled, and the power supply is continuously maintained. Start a monitoring timer that counts the elapsed time of time, and then allow the elapsed time that the monitoring timer has timed to exist outside the electrosphere as the duration that the mobile terminal device was outside the electrosphere The security data stored in the non-volatile memory is stored when a predetermined time as a permissible time range is exceeded. Removal, characterized in that.

  (3) A security data leakage prevention program according to the present invention is characterized in that at least the security data leakage prevention method described in (2) is implemented as a program executable by a computer.

  According to the portable terminal device, the security data leakage prevention method, and the security data leakage prevention program of the present invention, the following effects can be obtained.

  The first effect is to prevent leakage of security data stored in the mobile terminal device to a third party when an abnormal situation such as unauthorized removal, loss or theft of the mobile terminal device is detected. There is something you can do. The reason is that, when an abnormal situation such as illegal take-out, loss or theft of the mobile terminal device is detected, the security data stored in the mobile terminal device is controlled to be deleted.

  The second effect is that the security function of the mobile terminal device can always be operated even if the mobile terminal device exists outside the radio communication field. The reason is that when the wireless communication device is outside the electric field of wireless communication, the operation for turning off the power supply from the power supply is disabled, thereby enabling the security function of the mobile terminal device to operate. It is because it can maintain.

It is the schematic for demonstrating the general | schematic mechanism which prevents the outflow of the security data which the portable terminal device by this invention is preserve | saved. It is a block block diagram which shows an example of the internal structure of the portable terminal device by this invention. 3 is a flowchart for explaining an example of the operation of the mobile terminal device shown in FIG. 2.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of a mobile terminal device, a security data leakage prevention method, and a security data leakage prevention program according to the present invention will be described with reference to the accompanying drawings. In the following description, the portable terminal device and the security data leakage prevention method according to the present invention will be described. However, the security data leakage prevention method may be implemented as a security data leakage prevention program executable by a computer. However, it goes without saying that the security data leakage prevention program may be recorded on a computer-readable recording medium.

  The mobile terminal device according to the present invention includes, for example, a mobile phone, a PHS (Personal Handy-Phone) terminal device, a PDA (Personal Digital Assistants) terminal device (portable information terminal device), a smartphone, a tablet terminal, and a notebook PC (Personal Computer). ), Etc., and any type of portable terminal device may be used as long as it is a portable device that may store security data.

(Features of the present invention)
Prior to the description of the embodiments of the present invention, an outline of the features of the present invention will be described first. The present invention does not turn off (shut off) the power supply from the power source of the mobile terminal device when it is detected that the mobile terminal device equipped with the wireless communication function is outside the radio communication field. It has a function to delete security data stored in the mobile terminal device when the function to enable and the function to start the monitoring timer operate and the monitoring timer times out. It is a feature.

  Thus, even when an abnormal situation such as illegal take-out, theft or loss of a mobile terminal device occurs, the outflow of security data stored in the mobile terminal device is surely prevented. Can do.

More specifically, according to the present invention, the mobile terminal device includes at least the following units.
(1) Electric field detection means for detecting the radio communication field area and the radio communication field area (2) Power control means for disabling the power OFF function of the portable terminal device when the radio communication field area is detected ( 3) Power control means for enabling the power-off function of the mobile terminal device when the wireless communication field is detected. (4) Timer control means for starting a monitoring timer when detecting the outside of the wireless communication field. (5) Timer control means for clearing the monitoring timer when the radio communication field is detected (6) Security data deleting means for deleting the security data stored in the memory when the monitoring timer times out

(Embodiment of the present invention)
Next, in the portable terminal device according to the present invention, a schematic mechanism for preventing leakage of stored security data will be described first with reference to the conceptual diagram of FIG. FIG. 1 is a schematic diagram for explaining a general mechanism for preventing leakage of security data stored in a mobile terminal device according to the present invention.

  In the schematic diagram shown in FIG. 1, the mobile terminal device 10 performs various types of wireless communication via the wireless access point 20 only when the mobile terminal device 10 is in the area of the radio communication field 100 of the wireless access point 20. The wireless communication cannot be performed in the state of moving out of the electric field.

  A user who owns the mobile terminal device 10 processes and stores various business-use data using the mobile terminal device 10 in, for example, a business office that is in the field of electric field 100 of the wireless communication of the wireless access point 20. And doing business. As a result, various security data for business use are stored in the mobile terminal device 10. When the mobile terminal device 10 exists in the area of the wireless communication electric field 100 of the wireless access point 20, it is in the office and the business data is illegally taken out of the office Therefore, even if various types of security data are still stored in the mobile terminal device 10, there is no concern that the security data will leak out.

  However, when the mobile terminal device 10 is taken out of the office and moves out of the radio communication field of the wireless access point 20, the security data stored in the mobile terminal device 10 is, for example, Even if the data is stored in an encrypted state, the encryption key may be decrypted and flow out to the outside if a predetermined period of time elapses.

  Accordingly, when the mobile terminal device 10 moves out of the radio communication field of the wireless access point 20 and a predetermined time has elapsed, as shown in FIG. By deleting the security data stored in the apparatus 10, the security data is surely prevented from leaking outside.

(Configuration example of embodiment)
Next, an example of the internal configuration of the mobile terminal device according to the present invention will be described with reference to FIG. FIG. 2 is a block configuration diagram showing an example of the internal configuration of the mobile terminal device according to the present invention.

  A mobile terminal device 10 shown in FIG. 2 includes at least a control unit 1, a radio unit 2, a power supply unit 3, a security data storage unit 4, a display unit 5, and an input unit 6.

  The control unit 1 is a part that controls the overall operation of the mobile terminal device 10, and includes at least an electric field detection unit 11, a power supply control unit 12, a timer control unit 13, and a security data deletion unit 14.

  The wireless unit 2 is a part that performs wireless communication with a wireless access point for wireless communication within a premises or at home, and, for example, based on an instruction from the control unit 1, for example, IEEE 802.11 for WLAN (Wireless Local Area Network). It has a function of performing wireless communication complying with various standards, and also has a function of detecting the electric field strength of wireless communication with a wireless access point and transmitting it to the electric field detection unit 11 of the control unit 1.

  The electric field detection unit 11 of the control unit 1 is based on the electric field strength sent from the radio unit 2, and the mobile terminal device 10 exists in an electric field range in which radio communication with a radio access point is possible, or This is a part for determining whether or not the wireless access point is outside the electric field range where wireless communication with the wireless access point is impossible.

  When the electric field detection unit 11 detects that the mobile terminal device 10 is moving from the electric field area to the outside of the electric field area, the electric field detection unit 11 turns off the power supply of the power supply unit 3 to the power supply control unit 12 of the control unit 1. A request to invalidate the (blocking) operation is made, and a timer control unit 13 is requested to start a monitoring timer. On the other hand, when it is detected that the mobile terminal device 10 has moved from the outside of the electric field to the electric field, the power supply control unit 12 of the control unit 1 is turned off (cut off). While making a request to return to the valid state, the timer control unit 13 is requested to clear the monitoring timer.

  The timer control unit 13 of the control unit 1 controls the activation, clearing, and timeout of a monitoring timer that measures the elapsed time after the mobile terminal device 10 moves out of the electric field where wireless communication with a wireless access point is impossible. It is a part to perform.

  When the monitoring timer is requested from the electric field detection unit 11, the monitoring timer is activated. When the monitoring timer is requested to be cleared from the electric field detection unit 11, the time content of the monitoring timer is cleared. Further, the timer control unit 13 determines that when the monitoring timer has timed out after a predetermined time has elapsed, the elapsed time after moving out of the electric field extends over a long time exceeding the allowable time range. Therefore, the security data deletion unit 14 is requested to delete the security data stored in the security data storage unit 4.

  The power supply unit 3 includes a battery for supplying power to each part in the mobile terminal device 10, and the power supply line to each part is turned off based on control from the power control unit 12 of the control unit 1 ( A changeover switch is provided for switching between cutoff and ON (conduction).

  Here, the power supply control unit 12 of the control unit 1 is a part that controls the changeover switch of the power supply unit 3 in response to a request from the electric field detection unit 11. That is, when the electric field detection unit 11 detects that the mobile terminal device 10 has moved from the electric field range to the outside of the electric field range, the operation for turning off (cutting off) the changeover switch for supplying power to each part is invalidated. On the contrary, when the electric field detector 11 detects that the mobile terminal device 10 has moved from the outside of the electric field to the electric field, the changeover switch for supplying power to each part is turned off (shut off). Enable operation.

  The security data storage unit 4 is a memory region that stores security data, which is secure information, among memory regions formed of a nonvolatile memory that stores data in the mobile terminal device 10. The control unit 1 The security data stored in the security data storage unit 4 can be deleted by the control from the security data deletion unit 14.

  Here, the security data deletion unit 14 of the control unit 1 is a part that deletes the security data stored in the security data storage unit 4 in response to a request from the timer control unit 13. That is, when the security data deletion unit 14 detects by the monitoring timer that a predetermined time has elapsed since the mobile terminal device 10 moved out of the wireless communication range of the wireless access point in the timer control unit 13. In order to prevent the security data stored in the security data storage unit 4 from leaking outside, the security data stored in the security data storage unit 4 is deleted.

  As described above, as long as the mobile terminal device 10 is outside the electric field, the power supply from the power supply unit 3 continues to be supplied to each part, and at least the electric field detection unit 11 in the control unit 1. The power control unit 12, the timer control unit 13, and the security data deletion unit 14 are also in a state where they can operate normally, and the security data stored in the security data storage unit 4 by the security data deletion unit 14 Can be reliably deleted.

  Furthermore, even if the mobile terminal device 10 exists outside the electric field, since the power supply from the power supply unit 3 to each part is continued, the battery consumption of the power supply unit 3 is accelerated. Also, it is possible to shorten the retention time of security data physically stored in the security data storage unit 4 composed of a nonvolatile memory in the mobile terminal device 10.

  The display unit 5 is a part that displays various data on a liquid crystal panel or the like based on the control from the control unit 1 and presents it to the user. The input unit 6 receives buttons, a keyboard, and the like from the user. This is a part that transmits information input via the control unit 1 to the control unit 1 based on control from the control unit 1.

(Description of operation of embodiment)
Next, an example of the operation of the mobile terminal device shown in FIG. 2 will be described using the flowchart of FIG. FIG. 3 is a flowchart for explaining an example of the operation of the mobile terminal device 10 shown in FIG. 2, and shows an example of the operation of the control unit 1 of the mobile terminal device 10.

  In the flowchart of FIG. 3, first, the electric field detection unit 11 of the control unit 1 compares the electric field strength of wireless communication with the wireless access point detected by the wireless unit 2 with a predetermined strength threshold value, thereby comparing the mobile terminal device 10. Is periodically determined whether it exists within the field of radio communication with the wireless access point or outside the field (step S1). When it is determined that the electric field exists within the electric field range (N in step S1), the operation for periodically determining the electric field strength is repeated without performing any particular processing.

  On the other hand, when the mobile terminal device 10 determines that the mobile terminal device 10 is outside the field of wireless communication with the wireless access point (Y in step S1), the power supply control unit 12 is activated and the power supply unit 3 is switched. Control is performed to invalidate the switching operation for turning off (shut off) the switch, and the power supply from the power supply unit 3 to each part is maintained as it is (step S2).

  After that, the timer control unit 13 is activated, first, the monitoring timer is cleared and set to the initial state (step S3), and then the count-up (timekeeping) operation of the monitoring timer is started (step S4). Next, using the electric field detection unit 11, it is confirmed whether or not the mobile terminal device 10 still exists outside the electric field range of wireless communication with the wireless access point (step S <b> 5).

  When the mobile terminal device 10 has returned from the outside of the electric field of the wireless communication with the wireless access point to the electric field (N in Step S5), the power supply control unit 12 is activated and the changeover switch of the power supply unit 3 is turned off ( After returning to the state in which the operation of switching to the (shut off) state is enabled, the timer control unit 13 is activated to clear the monitoring timer (step S9), and then the process proceeds to step S1.

  On the other hand, when the state where the portable terminal device 10 still exists outside the electric field range of the wireless communication with the wireless access point continues (Y in step S5), the timer control unit 13 shifts to the outside of the electric field range. The monitoring timer that has started the count-up operation from the point of time when the mobile terminal device 10 is detected has a counter value indicating the passage of a predetermined time as a permissible time range in which the mobile terminal device 10 is allowed to exist outside the electric field. It is checked whether or not it has been reached (step S6).

  If the monitoring timer has not reached the counter value indicating the predetermined time (N in Step S6), the process returns to Step S5, and the mobile terminal device 10 is still outside the field of radio communication with the wireless access point. The operation of confirming whether or not to continue is repeated.

  Further, when the monitoring timer reaches the counter value indicating the certain time (Y in Step S6), the mobile terminal device 10 exceeds the allowable time range in which the mobile terminal device 10 is allowed to exist outside the electric field. Considering that an abnormal state in which the terminal device 10 continues to exist outside the radio communication field (for example, a situation in which the mobile terminal device 10 is illegally taken out, lost, stolen, etc.) has occurred, security The data deletion unit 14 is activated to delete the security data stored in the security data storage unit 4 of the mobile terminal device 10 as the secure information to be protected (step S7).

  Thereafter, assuming that the security measures for the mobile terminal device 10 have been completed, the power supply control unit 12 is activated to return to the state in which the operation of switching the changeover switch of the power supply unit 3 to the OFF (cut-off) state is enabled (step). S8).

  By performing the operation as described above, if the time that is outside the radio communication field of the mobile terminal device 10 becomes abnormally long, the mobile terminal device is abnormally taken out, lost, stolen, etc. Therefore, it is possible to delete the security data stored in the mobile terminal device in order to prevent the leakage of the security data to a third party.

  The configuration of the mobile terminal device is configured so that power can be supplied to other parts except the display unit, and only the power supply to the display unit can be stopped. When the power OFF function is disabled, the power is turned off. When the above operation is performed, only the power supply to the display unit may be stopped so that the mobile terminal device appears to be turned off.

  In addition, it is conceivable that the person who steals the mobile terminal device will try to force the battery to be turned off by removing the battery. To prevent this, the structure of the mobile terminal device is The cover to be removed may be fixed with a special screw so that the battery cannot be removed unless a tool corresponding to the special screw is used. In addition, when the battery of the mobile terminal device is pulled out and the power supply is stopped, a backup battery that can supply power to the mobile terminal device for a time exceeding a certain time counted by the monitoring timer is provided. A configuration may be provided in which power is supplied from a backup battery. In this case, it is desirable that the backup battery has a structure that is not visible from the outside even when the battery of the mobile terminal device is to be removed.

  Further, the communication mode in which the wireless unit 2 performs wireless communication with a wireless access point is not limited to wireless communication conforming to IEEE 802.11 standard for WLAN (Wireless Local Area Network). For example, Bluetooth (registered trademark) ) Wireless communication using a standard, WiMAX (Worldwide Interoperability for Microwave Access) standard, or the like, and the location where the mobile terminal device 10 is located for the specified wireless access point among the wireless access points in each communication form. The electric field detector 11 may monitor whether or not the specified wireless access point exists outside the communication range.

  Alternatively, communication that performs wireless communication with a base station corresponding to the FOMA (Freedom of Mobile multimedia Access) standard, which is a third-generation mobile communication service, or the LTE (Long Term Evolution) standard, etc., of a 3.9th-generation mobile communication service Even if it is a form, about the radio base station specified among each radio base station, the place where the portable terminal device 10 exists is outside the communication area (cell) of the specified radio base station in the electric field detection unit 11. When the presence is detected, it is possible to prevent the security data from being leaked using the completely same mechanism.

  Further, in the above-described embodiment, when the mobile terminal device 10 detects that the wireless access point has moved out of the radio communication field, the power source control unit 12 of the control unit 1 sets the changeover switch of the power source unit 3. As long as the operation of setting the ON (conducting) state to the OFF (blocking) state is invalidated and the mobile terminal device 10 is outside the electric field, at least the control unit 1 operates normally, and the security data storage unit 4 Although the security data stored in can be deleted by the security data deleting unit 14, the present invention is not limited to such a case.

  For example, the nonvolatile memory including the security data storage unit 4 stores at least a program that executes functions corresponding to the electric field detection unit 11 and the security data deletion unit 14. Furthermore, when the power supply of the mobile terminal device 10 changes from the OFF (shutoff) state to the ON (conduction) state and the power supply to the nonvolatile memory is started, the startup sequence is always started. First, in the electric field detection program corresponding to the electric field detection unit 11, it is determined whether the mobile terminal device 10 is present in the field of radio communication of the wireless access point or outside of the field. When it is detected that the mobile terminal device 10 is outside the electric field, the security data deletion program corresponding to the security data deletion unit 14 is activated and the security data stored in the security data storage unit 4 Implement the process to delete. You may make it employ | adopt the above structures.

  Even in such a case, the nonvolatile memory storing the program for executing the function corresponding to the security data storage unit 4, the electric field detection unit 11, and the security data deletion unit 14 is removed from the mobile terminal device 10. It is also assumed that it is mounted on other equipment. Therefore, as described above, even when the device is mounted on another device, the state where the device is mounted on another device and power is not supplied to the nonvolatile memory is switched to a state where power is supplied. In this case, it is always desirable to configure the activation sequence to be activated as described above.

(Explanation of effect of embodiment)
As described in detail above, the following effects are obtained in the present embodiment.

  The first effect is to prevent leakage of security data stored in the mobile terminal device 10 to a third party when an abnormal situation such as unauthorized removal, loss or theft of the mobile terminal device 10 is detected. There is in being able to. The reason is that the security data stored in the mobile terminal device 10 is controlled to be deleted when an abnormal situation such as unauthorized removal, loss or theft of the mobile terminal device 10 is detected. .

  The second effect is that the security function of the mobile terminal device 10 can always be operated even if the mobile terminal device 10 exists outside the radio communication field. The reason for this is that when the wireless communication device is outside the electric field of wireless communication, the security function of the mobile terminal device 10 can be operated by disabling the operation of turning off (cutting off) the power supply from the power supply. This is because the state can be maintained. Furthermore, even if the mobile terminal device 10 is outside the radio communication field, the state in which power is supplied from the battery (power source) is continued, so that security data is physically stored along with battery power consumption. It is also possible to reduce the retention time of the stored nonvolatile memory.

  The configuration of the preferred embodiment of the present invention has been described above. However, it should be noted that such embodiments are merely examples of the present invention and do not limit the present invention in any way. Those skilled in the art will readily understand that various modifications and changes can be made according to a specific application without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Control part 2 Wireless part 3 Power supply part 4 Security data storage part 5 Display part 6 Input part 10 Portable terminal device 11 Electric field detection part 12 Power supply control part 13 Timer control part 14 Security data deletion part 20 Wireless access point 100 Electric field range

Claims (7)

  When security data that requires confidentiality is stored in a non-volatile memory and is a mobile terminal device that performs wireless communication, the power supply from the power supply is cut off when it is detected that the wireless communication has moved out of the electric field. The operation to be performed is set to be invalid, the power supply is continuously maintained, and the monitoring timer that measures the elapsed time since moving outside the electrosphere is started, and then the duration that has existed outside the electrosphere The security data stored in the nonvolatile memory is deleted when the elapsed time measured by the monitoring timer exceeds a predetermined time as a permissible time range allowing the presence of the monitoring timer outside the electric field. A portable terminal device.   The outside of the electric field of the wireless communication is at least outside the communication range of the specified wireless access point among wireless access points in the communication mode of the WLAN (Wireless Local Area Network) standard, the Bluetooth standard, or the WiMAX (Worldwide Interoperability for Microwave Access) standard. The mobile terminal device according to claim 1.   The outside of the electric field of the wireless communication is at least outside the communication area of the specified wireless base station among wireless base stations in a communication form of FOMA (Freedom of Mobile multimedia Access) standard or LTE (Long Term Evolution) standard. The portable terminal device according to claim 1.   A security data leakage prevention method in a portable terminal device for performing wireless communication in which security data requiring confidentiality is stored in a nonvolatile memory, and detecting that the portable terminal device has moved out of the field of wireless communication In this case, the operation to cut off the power supply from the power supply is set to be invalid, the power supply is continuously maintained, and a monitoring timer that measures the elapsed time after moving out of the electric field is started, and accordingly After that, the elapsed time counted by the monitoring timer as the duration that the mobile terminal device was outside the electrosphere exceeded a predetermined time as an allowable time range that allowed it to exist outside the electrosphere In this case, the security data stored in the non-volatile memory is deleted. .   The outside of the electric field of the wireless communication is at least outside the communication range of the specified wireless access point among wireless access points in the communication mode of the WLAN (Wireless Local Area Network) standard, the Bluetooth standard, or the WiMAX (Worldwide Interoperability for Microwave Access) standard. The security data leakage prevention method according to claim 4, wherein:   The outside of the electric field of the wireless communication is at least outside the communication area of the specified wireless base station among wireless base stations in a communication form of FOMA (Freedom of Mobile multimedia Access) standard or LTE (Long Term Evolution) standard. The security data leakage prevention method according to claim 4.   7. A security data leak prevention program characterized in that the security data leak prevention method according to claim 4 is implemented as a program executable by a computer.

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