JP2011086047A - Portable terminal, method of improving security level thereof, security level improving program, and program recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a portable terminal for preventing a key lock state from being easily released and improving success rate of a remote wipe function. <P>SOLUTION: The portable terminal includes: a first key map 3 registering functions in normal mode of each operation key of an operation key part 1; and a second key map 4 registering functions in security mode. When a user issues an instruction to set key lock as an operation for transition from the normal mode to the security mode, the functions registered in the first key map 3 of each operation key are dynamically changed to the functions registered in the second key map 4. In the first key map 3, the same function as the function indicated on each operation key is assigned. In the second key map 4, a function different from the function indicated on the operation key is assigned. In the second key map 4, a power key to turn off the portable terminal is disabled. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a portable terminal, a portable terminal security level improving method, a security level improving program, and a program recording medium.

  For example, Japanese Patent Application Laid-Open Publication No. 2006-277522, “Information Processing Device and Information Processing Device Authentication Method” of Patent Document 1, describes a function of a current mobile phone in order to improve the security level in preparation for loss or theft of a mobile phone. As described in Japanese Patent Laid-Open No. 2002-374564, “Security System for Recorded Content of Mobile Phone”, which remotely erases stored information. It has a Wipe (Remote Wipe) function.

  However, a simple password that is easy to guess is often used as a password for releasing the key lock, and the security level of the mobile phone becomes weak or the mobile phone is obtained by a third party who acquires the lost mobile phone. If an operation is performed to turn off the power of the mobile phone, even if an authorized user of the mobile phone attempts to activate the remote wipe function, the remote wipe function cannot be operated and is stored in the mobile phone. If you want to or not be able to erase the memory content occurs.

JP 2006-277522 A (pages 7-9) JP 2002-374564 A (page 2-3)

  The present invention has been made in order to solve the above-described security problems in current portable terminals. When the portable terminal is switched from the normal mode to the security mode, the function of each operation key of the portable terminal ( By dynamically changing the key map that registers the key code) to set the key lock state and disabling the power key that turns off the power, even if the user of the mobile terminal is simple Even if a password has been set, the password cannot be entered correctly by a third party to unlock the key lock, and the third party cannot turn off the power. It is possible to improve the execution success rate of the remote wipe function by setting the status, and thus to improve the security level Mobile terminal, the mobile terminal security level improved method, to provide a level of security improvement program and a program recording medium, and an object of the present invention.

  In order to solve the above-described problems, the mobile terminal according to the present invention employs the following characteristic configuration.

  (1) A mobile terminal provided with operation keys operated by a user, a first key map in which functions of the operation keys in the normal mode are registered, and a second key in which functions of the operation keys in the security mode are registered. A key map, and when a user performs an operation to instruct a transition from the normal mode to the security mode, the function of each operation key is registered from the first key map to the second key map. Mobile device that dynamically changes to a new function.

  According to the portable terminal, portable terminal security level improving method, security level improving program and program recording medium of the present invention, the following effects can be obtained.

  In the portable terminal of the present invention, when the operation mode of the portable terminal is switched from the normal mode to the security mode, and a key lock is applied to each operation key, a function (key code) assigned to each operation key is normally set. The second key assigned a different function that does not correspond to the function indicated by the marking of each operation key from the state of the first key map in which the same function (key code) as the marking of each operation key is assigned as the use state of Since it changes dynamically to the map state, even if a third party who has obtained a password for releasing the key lock state by some means, inputs the password according to the stamp of each operation key, what is the stamp? Since a different function (key code) is assigned, the key lock state cannot be released. Thus, the security level of the mobile terminal can be improved.

  Further, in the state of the second key map in which the key map is dynamically changed when the key lock is applied, the power key for turning off the power of the mobile terminal is set to an invalid state. Even if a third party who acquired the device by some means tries to disable the remote wipe function by operating the power key and turning the power off, the power on state will continue and the remote wipe function will be disabled Therefore, the success rate at which the remote wipe function operates successfully can be improved, and the security level of the mobile terminal can be improved.

  Furthermore, from the state of the security mode where the second key map is applied as the key map to the state of the normal mode where the first key map to which the function (key code) corresponding to the function indicated by the marking of each operation key is assigned is applied. In order to recover, it is necessary to operate according to a procedure according to a special key sequence determined in advance for the mobile terminal. Therefore, unless the special key sequence is known, the first key map is applied. It is difficult to return to the normal mode, and it is difficult to perform a key operation for performing a desired function.

  That is, even if a third party acquires a password for releasing the key lock state by some means and tries to input the password, correct key operation cannot be performed. In addition, even when the password for releasing the key lock state is a simple password, the security to which the second key map to which a different function that does not correspond to the function indicated by the marking of each operation key is assigned is applied. Since the mode state continues, it is difficult to input the password correctly.

  In addition, when a procedure according to a predetermined special key sequence is performed in order to return to the normal mode where the first key map is applied as a key map for assigning a function (key code) to each operation key. Even if the password for releasing the key lock state, that is, the password for releasing the security mode is not input, the time for returning to the normal mode state to which the first key map is applied is determined in advance. It is only for a certain period of time, and when the certain period of time has passed, the state of the security mode to which the second key map in which the function of each operation key is different from the engraving (key lock state) is applied is automatically applied. Since it migrates, the security level can be improved more reliably.

It is a schematic diagram which shows the structural example of the operation part of the mobile telephone which is an example of the portable terminal by this invention.

  Preferred embodiments of a portable terminal, portable terminal security level improving method, security level improving program, and program recording medium according to the present invention will be described below with reference to the accompanying drawings. In the following description, the portable terminal and the portable terminal security level improving method according to the present invention will be described. However, the portable terminal security level improving method may be implemented as a security level improving program that can be executed by a computer. However, it goes without saying that the security level improvement program may be recorded on a computer-readable recording medium.

  Further, in the following description, a case where a mobile phone is used as an example of the mobile terminal according to the present invention will be described. However, the mobile terminal according to the present invention is not limited to such a mobile phone, but a PHS (Personal Handy-Phone System). ) A terminal, a PDA (Personal Digital Assistants) device, a portable PC (Personal Computer), or a portable music player.

(Features of the present invention)
Prior to the description of the embodiments of the present invention, the features of the present invention will be first outlined. The present invention relates to a normal mode in which a function (key code) of each operation key forming an operation unit of a mobile terminal such as a mobile phone is registered, and a key lock to each operation key. The main feature is that it is dynamically changed at the time of switching to the security mode in which the power key is disabled and the power key is disabled. That is, a key map that assigns the function (key code) of each operation key when the user of the portable terminal gives an instruction to switch from the normal mode to the security mode at the time of improving the security level of the portable terminal. From the first key map in which the function (key code) imprinted on each operation key is registered, the power key for turning off the power is disabled and the function different from the imprint of each operation key ( The main feature is switching to a state in which the second key map in which the key code is registered is applied. Thus, it is possible to improve the security level of the portable terminal, and achieve the effect of strengthening the password and improving the remote wipe success rate.

(Configuration example of embodiment)
Next, a configuration example of an embodiment of a mobile phone which is an example of a mobile terminal according to the present invention will be described with reference to FIG. FIG. 1 is a schematic diagram showing a configuration example of an operation unit of a mobile phone which is an example of a mobile terminal according to the present invention, and an arrangement example of operation keys constituting the operation unit of the mobile phone is a liquid crystal panel forming a display unit. It is shown together with.

  1A shows an arrangement example of the operation key unit 1 and the display unit 2 of the mobile phone. The operation keys constituting the operation key unit 1 are “0” to “9”. From numeric keys with "*" and special sign keys with "#" and "#", function keys with "Call" and "Clear", and power keys with "Power" An example is shown.

  The first key map 3 and the second key map shown in FIG. 1B and FIG. 1C, respectively, are assigned to the respective operation keys shown in the operation key section 1 of FIG. 1B, the first key map 3 shown in FIG. 1B shows the function (key code) of each operation key in the normal mode, and the second key map shown in FIG. The key map 4 shows the function (key code) of each operation key in the security mode.

  In the first key map 3 in the normal mode shown in FIG. 1B, the function (key code) assigned to each operation key is imprinted on each operation key shown in the operation key section 1 in FIG. The power key on the upper right is also assigned to the valid state.

  On the other hand, in the second key map 4 in the security mode shown in FIG. 1C, the function (key code) assigned to each operation key is imprinted on each operation key shown in the operation key section 1 in FIG. The power key at the upper right is blank and indicates that it is set to an invalid state. Here, the function (key code) of each operation key registered in the second key map 4 applied in the security mode is assigned to each operation key for each mobile phone at the time of shipment or sale of the mobile phone. A function (key code) different from the engraved function is randomly assigned, and further, a user who purchased the mobile phone may rewrite at random at an arbitrary time.

  When the user performs an operation of switching the mobile phone from the normal mode to the security mode, the function (key code) of each operation key of the operation key unit 1 of the mobile phone is the same as that of the first key map 3 shown in FIG. The assignment state is automatically switched to the assignment state of the second key map 4 shown in FIG. As a result, in the state set in the security mode, each operation key of the mobile phone is not a function (key code) indicated by the inscription of each operation key in FIG. Automatically change to a key code) to improve the security level for third parties.

  That is, when the second key map 4 in the security mode of FIG. 1C is applied, each operation key of the operation key unit 1 has a function (key code) different from the marking of FIG. Since it is assigned, the operation key is locked and the third party cannot perform the key operation corresponding to the desired function. When the second key map 4 in the security mode of FIG. 1C is applied, the power key for turning off the power of the mobile phone is set to an invalid state. Therefore, when the normal mode is switched to the security mode while the power is on, the power-on state continues as long as the security mode is set, so the remote wipe function that erases stored information remotely is effective. It can be set to a proper state.

(Description of operation of embodiment)
Next, an example of the operation of the mobile phone shown in FIG. 1 will be described in more detail.

  When the mobile phone is set to the normal mode in the normal use state, the function (key code) of each operation key is as shown in FIG. 1A so that the user can operate each operation key. It is assigned to the state of the first key map 3 in FIG. 1B which has the same function as the marking of each operation key.

  On the other hand, the function (key code) assigned to each operation key at the timing when the user performs the operation of switching to the security mode when the user does not use the mobile phone and the key lock is applied is shown in FIG. ) Of the first key map 3 is automatically switched to the state of the second key map 4 of FIG. Here, the key lock is a function for restricting the operation of the operation key unit 1 in order to improve the security level, and the function (key code) of each operation key is set to a state different from the engraving. The operator who operates is unable to determine the function (key code) of each operation key. Further, while the key is locked, only a part of operations such as a procedure operation according to a special key sequence determined in advance as a sequence for returning from the security mode to the normal mode is accepted.

  In general, it is desirable to set a character string that is difficult to guess for the password for releasing the key lock state. However, since it is difficult for the user of the mobile phone to remember the password, it is difficult to remember. There are many examples of easy and simple password setting.

  For this reason, in the present embodiment, the following sequence is applied. First, by operating according to a procedure according to a predetermined special key sequence as the mobile phone, the normal mode is switched to the security mode, and the operation key assignment state is changed to the first key map of FIG. 1B in the normal mode. From the assigned state of 3 to the assigned state of the second key map 4 of FIG. 1C in the security mode, each operation key is set to a locked key lock state. Next, when the operation key assignment state is to be returned to the assignment state of the first key map 3 in FIG. 1B in the normal mode after the transition to the security mode in the key lock state, FIG. by operating in the procedure in accordance with the predetermined special key sequence as a sequence for returning the allocation status of the first key map 3 B) (i.e. a sequence for returning from the security mode to the normal mode), previously It shall return to the 1st key map 3 of a normal state shown in FIG.1 (B) only for the fixed fixed time.

  Therefore, in order to completely cancel the security mode and return to the normal mode in which the key lock state is released, the operation key assignment state is changed to the assignment state of the first key map 3 in FIG. 1B in the normal mode. Enter a special key sequence to return to (that is, a special key sequence to return from the security mode to the normal mode), and the function (key code) indicated by the marking of each operation key is assigned as the operation key assignment status After returning to the first key map 3 in FIG. 1B, the correct password for releasing the key lock state, that is, the correct password for releasing the security mode, until the predetermined time elapses. You will need to enter your password.

  By applying such a sequence, a third party who does not know the special key sequence as described above acquires the password for releasing the security mode and releasing the key lock state by some means, and the acquired password Even if the operation key is entered according to the marking of the operation key, each operation key remains in the assigned state of the second key map 4 in FIG. 1C, so that the correct password cannot be input and the security mode is canceled. Thus, the probability that the key lock state is released can be kept low. In addition, even if the user of the mobile phone sets a simple password as a password for releasing the security mode and information on the password is likely to be leaked, a special key sequence as described above is used. A third party who does not know cannot release the security mode.

  If the mobile phone is lost or stolen, even if the user of the mobile phone is in a remote location where the mobile phone cannot be touched, the mobile phone is provided with security measures. The stored remote wipe function can erase data stored in the mobile phone. However, if the power of the mobile phone is set to an off state, the remote wipe function itself cannot be used.

  In FIG. 1, as described above, when the mode is shifted to the security mode and set to the key lock state, the power key for turning off the power of the mobile phone is in an invalid state in FIG. The operation key assignment state of the second key map 4 is set, and the sequence for setting the state of the first key map 3 of FIG. 1 (B) in which the power key becomes valid (that is, for releasing the security mode) In order to turn off the power without returning to the operation key assignment state of the first key map 3 shown in FIG. 1B unless the operation is performed according to a procedure according to a special key sequence predetermined as a sequence). The power key remains disabled.

  In other words, even if a third party who has illegally acquired a mobile phone operates the power key to turn off the mobile phone and disables the remote wipe function, the third party cannot Since the special key sequence for returning to the state of the first key map 3 of FIG. 1B becomes unknown, the power key remains in the state of the second key map 4 of FIG. 1C. Therefore, a third party cannot turn off the mobile phone. Even if the operation is performed according to a procedure according to such a special key sequence, a predetermined time has elapsed unless a password for releasing the key lock state, that is, a keyword for releasing the security mode is input. Until then, the operation key assignment state of the first key map 3 can be continued. Therefore, if a keyword for canceling the security mode is not input even if the procedure according to a special key sequence is performed to return to the state of the first key map 3 in FIG. Before the time elapses, it is necessary to operate the power key to turn off the power.

  Here, if the mobile phone battery exchange is not possible type, a third party that the mobile phone is acquired illegally is, even as the attempt to remove the battery in an attempt to disable the remote wipe function of the mobile phone, Since the battery cannot be physically removed from the mobile phone in which the battery cannot be replaced, the security measure using the remote wipe function as described above functions more effectively.

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

  In the mobile phone which is an example of the mobile terminal of the present invention, when the operation mode is switched from the normal mode to the security mode and each operation key of the operation key unit 1 is key-locked, the function is assigned to the key map, that is, each operation key. (Key code) is different from the function indicated by the marking of each operation key from the state of the first key map 3 in which the same function (key code) as the marking of each operation key is assigned as the normal use state. Since the function is dynamically changed to the state of the second key map 4 to which the function is assigned, even if a third party who obtains a password for releasing the key lock state by some means, the password is imprinted on each operation key. Even if entered according to, the key lock state can be released because a function (key code) different from the stamp is assigned. No. Thus, the security level of the mobile terminal can be improved.

  Further, in the state of the second key map 4 in which the key map is dynamically changed when the key lock is applied, the power key for turning off the mobile terminal is set to an invalid state. Even if a third party who acquired the mobile phone by some means tries to disable the remote wipe function by operating the power key and turning the power off, the power on state continues and the remote wipe function is activated. Since it cannot be disabled, the success rate at which the remote wipe function operates successfully can be improved, and the security level of the mobile phone can be improved.

  Further, in the normal mode to which the first key map 3 to which a function (key code) that matches the function indicated by the marking of each operation key is assigned from the state of the security mode to which the second key map 4 is applied as a key map. In order to return to the state, it is necessary to operate in accordance with a procedure according to a special key sequence predetermined for the mobile phone. Therefore, unless the special key sequence is known, the first key map 3 It is difficult to return to the applied normal mode, and it is difficult to perform a key operation for performing a desired function.

  That is, even if a third party acquires a password for releasing the key lock state by some means and tries to input the password, correct key operation cannot be performed. Further, even when the password for releasing the key lock state is a simple password, the second key map 4 to which a different function that does not correspond to the function indicated by the marking of each operation key is applied. Since the security mode state continues, it is difficult to input the password correctly.

  Also, a procedure according to a predetermined special key sequence was performed to return to the normal mode where the first key map 3 is applied as a key map for assigning a function (key code) to each operation key. Even if the password for releasing the key lock state, that is, the password for releasing the security mode is not input, the time for returning to the normal mode state to which the first key map 3 is applied is as follows. A security mode in which the second key map 4 is applied in a state (key lock state) in which the function of each operation key is different from the marking automatically after the predetermined time period has elapsed. Therefore, the security level can be improved more reliably.

The configuration of the preferred embodiment of the present invention has been described above. However, it should be noted that such examples are merely illustrative of the invention and do not limit the 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. For example, the embodiment of the present invention can be expressed as the following configuration in addition to the configuration (1) in the means for solving the problems.
(2) Each operation key registered in the first key map is assigned the same function as the function imprinted on each operation key, and each of the operation keys registered in the second key map The portable terminal according to (1), wherein a function different from a function imprinted on each operation key is assigned to the operation key.
(3) The mobile terminal according to (1) or (2), wherein in the second key map, a power key for turning off the power of the mobile terminal is set to invalid among the operation keys.
(4) The operation for returning from the security mode to the normal mode is an operation of a procedure according to a key sequence predetermined for each portable terminal as a sequence for returning to the normal mode. Or any one of (3) portable terminals.
(5) When operating in accordance with a predetermined key sequence as a sequence for returning from the security mode to the normal mode, the operation returns to the normal mode for a predetermined time, and each of the operations The portable terminal according to (4), wherein the key is assigned to the function registered in the first key map.
(6) If the password for canceling the security mode is not input before the predetermined time elapses after returning to the normal mode, the security The mobile terminal according to (5), wherein the mode is set and each operation key is assigned to a function registered in the second key map.
(7) The operation according to any one of (1) to (6), wherein the operation for instructing transition from the normal mode to the security mode is an operation for instructing key lock in a state where each operation key is locked. Mobile device.
(8) A mobile terminal security level improving method for improving a security level of a mobile terminal having an operation key operated by a user, wherein the first key map in which functions of the operation keys in the normal mode are registered, and the security mode And a second key map in which the function of each operation key is registered, and when the user performs an operation to instruct the transition from the normal mode to the security mode, A mobile terminal security level improving method for dynamically changing from a first key map to a function registered in the second key map.
(9) Each of the operation keys registered in the first key map is assigned the same function as the function imprinted on each of the operation keys, and each of the operation keys registered in the second key map The portable terminal security level improving method according to (8), wherein a function different from a function stamped on each operation key is assigned to the operation key.
(10) The mobile terminal security according to (8) or (9), wherein in the second key map, a power key for turning off the power of the mobile terminal is set to invalid among the operation keys. Level improvement method.
(11) The operation for returning from the security mode to the normal mode is a procedure operation according to a key sequence predetermined for each portable terminal as a sequence for returning to the normal mode. Or the mobile terminal security level improving method according to any one of (10).
(12) When an operation is performed in accordance with a predetermined key sequence as a sequence for returning from the security mode to the normal mode, the operation returns to the normal mode for a predetermined time, and each of the operations The portable terminal security level improving method according to (11), wherein the key is assigned to the function registered in the first key map.
(13) If the password for canceling the security mode is not input before the predetermined time elapses after the return to the normal mode, the security is performed after the predetermined time elapses. (12) The mobile terminal security level improving method according to (12), wherein each operation key is assigned to a function registered in the second key map.
(14) The operation according to any one of (8) to (13), wherein the operation instructing the transition from the normal mode to the security mode is an operation instructing a key lock in a state where each of the operation keys is locked. Mobile terminal security level improvement method.
(15) A security level improvement program in which the mobile terminal security level improvement method according to any one of (8) to (14) is implemented as a program executable by a computer.
(16) A program recording medium in which the security level improving program of (15) is recorded on a computer-readable recording medium.

1 Operation key part 2 Display part 3 1st key map 4 2nd key map

Claims (16)

  A mobile terminal having operation keys operated by a user, a first key map in which functions of the operation keys in the normal mode are registered, and a second key map in which functions of the operation keys in the security mode are registered. When the user performs an operation for instructing the transition from the normal mode to the security mode, the function of each operation key is changed from the first key map to the function registered in the second key map. A portable terminal characterized by changing dynamically.   Each operation key registered in the first key map is assigned the same function as the function imprinted on each operation key, and each operation key registered in the second key map is assigned to each operation key. The mobile terminal according to claim 1, wherein a function different from a function stamped on each operation key is assigned.   3. The mobile terminal according to claim 1, wherein, in the second key map, a power key for turning off the power of the mobile terminal among the operation keys is set to be invalid. .   The operation for returning from the security mode to the normal mode is an operation of a procedure according to a key sequence predetermined for each mobile terminal as a sequence for returning to the normal mode. The mobile terminal according to any one of 1 to 3.   When operating in accordance with a procedure according to the predetermined key sequence as a sequence for returning from the security mode to the normal mode, the mode returns to the normal mode for a predetermined time, and each of the operation keys is 5. The mobile terminal according to claim 4, wherein the mobile terminal is assigned to a function registered in the first key map.   If the password for canceling the security mode is not input before the predetermined time elapses after returning to the normal mode, the security mode is set after the predetermined time elapses. The mobile terminal according to claim 5, wherein each of the operation keys is assigned to a function registered in the second key map.   The operation for instructing the transition from the normal mode to the security mode is an operation for instructing key lock in a state where each of the operation keys is locked. Mobile devices.   A mobile terminal security level improving method for improving a security level of a mobile terminal provided with an operation key operated by a user, wherein a first key map in which a function of each operation key in a normal mode is registered, and each of the above in a security mode A second key map in which the function of the operation key is registered, and when the user performs an operation for instructing the transition from the normal mode to the security mode, the function of each operation key is changed to the first key. A mobile terminal security level improving method, wherein the function is dynamically changed from a map to a function registered in the second key map.   Each operation key registered in the first key map is assigned the same function as the function imprinted on each operation key, and each operation key registered in the second key map is assigned to each operation key. 9. The mobile terminal security level improving method according to claim 8, wherein a function different from a function stamped on each operation key is assigned.   10. The mobile terminal according to claim 8, wherein, in the second key map, a power key for turning off the power of the mobile terminal among the operation keys is set to be invalid. 11. Security level improvement method.   The operation for returning from the security mode to the normal mode is a procedure operation according to a key sequence predetermined for each portable terminal as a sequence for returning to the normal mode. The mobile terminal security level improving method according to any one of 8 to 10.   When operating in accordance with a procedure according to the predetermined key sequence as a sequence for returning from the security mode to the normal mode, the mode returns to the normal mode for a predetermined time, and each of the operation keys is The mobile terminal security level improving method according to claim 11, wherein the mobile terminal security level improving method is assigned to a function registered in the first key map.   If the password for canceling the security mode is not input before the predetermined time elapses after returning to the normal mode, the security mode is set after the predetermined time elapses. The mobile terminal security level improving method according to claim 12, wherein each of the operation keys is assigned to a function registered in the second key map.   14. The operation for instructing a transition from the normal mode to the security mode is an operation for instructing key lock in a state where each of the operation keys is locked. Mobile terminal security level improvement method.   15. A security level improvement program, wherein the portable terminal security level improvement method according to claim 8 is implemented as a program executable by a computer.   A program recording medium, wherein the security level improving program according to claim 15 is recorded on a computer-readable recording medium.

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