JP2005018143A - Mobile terminal setting change system using e-mail, setting change method, setting change data generation program, setting item change program, and recording medium recording these programs - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an environment for enabling a user of a portable terminal having a poor user interface to safely and easily change the setting of the terminal. <P>SOLUTION: A portable terminal 1 generates an encrypting key and a decoding key encrypting e-mail by a key generation program 102, decodes the e-mail encrypted with the encrypting key according to the decoding key by a decoding program 103 and analyzes the e-mail by a mail analysis program 104 to change the setting by an interface program for changing setting 101. On the other hand, an interface program 206 for changing setting 206 of a personal computer 2 displays setting items possible to be changed to receive a setting changing input from a user and requests the input of the encrypting key, a mail creation program 207 creates setting changing information input from the user in the e-mail, and an encryption program 208 encrypts the e-mail by using the input encrypting key to transmit it to the portable terminal 1. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a setting change system, a setting change method, a setting change data generation program, and a setting item for a portable terminal using an electronic mail that can be set and changed from any device outside the terminal. The present invention relates to a change program and a recording medium on which these programs are recorded.
[0002]
[Prior art]
In a conventional mobile terminal, the setting is changed using a user interface of the mobile terminal. In this case, the setting change operation is performed by looking at a paper manual or by looking at an operation instruction displayed on a display mounted on the portable terminal.
[0003]
In addition to this, a method of displaying an online manual on a terminal screen and changing the setting according to the displayed online manual has been proposed (see, for example, Patent Document 1).
[0004]
In addition, when a smart card management company that manages an IC card accepts an application for setting change from the mobile terminal in a mobile terminal equipped with an IC card, a setting change mail (e-mail) is created and the specified mail address is sent to There has also been proposed a method for changing the setting of a mobile terminal by transmitting (see, for example, Patent Document 2).
[0005]
[Patent Document 1]
JP 2002-218548 A
[Patent Document 2]
JP 2002-259869 A
[0006]
[Problems to be solved by the invention]
As described above, the conventional portable terminal completes all setting operations with a single terminal. However, in the method of displaying the explanation of the setting method on a small terminal screen, the amount of information that can be displayed is limited, so a manual is absolutely necessary. In this case, the manual can be an online manual as in the above-mentioned Patent Document 1, but manuals of portable terminals whose functions continue to increase are increasing in the amount of information. It was a troublesome thing.
[0007]
On the other hand, in the method of Patent Document 2 in which a setting change selected outside the terminal is sent to the terminal using e-mail, and the e-mail is analyzed by the terminal and the setting is changed, the IC card company and the communication carrier Since the tie-up is to use a dedicated communication line, protection of the setting contents is not considered at all. That is, the one described in Patent Document 2 is not intended for a setting change by a general user.
[0008]
The present invention was devised to solve such problems, and an object of the present invention is to provide an electronic mail that can provide an environment in which a user of a terminal can change settings safely and easily in a portable terminal having a poor user interface. An object of the present invention is to provide a mobile terminal setting change system, a setting change method, a setting change data generation program, a setting item change program, and a recording medium on which these programs are recorded.
[0009]
[Means for Solving the Problems]
A mobile terminal setting change system using electronic mail according to the present invention is a mobile terminal setting change system including a mobile terminal and an information terminal device such as a personal computer, wherein the mobile terminal encrypts an electronic mail. An e-mail encrypted with the encryption key based on the decryption key and a decryption key for decrypting the e-mail that is the setting change information of the mobile terminal encrypted with the encryption key The information terminal device displays a setting changeable item of the portable terminal and accepts a user's setting change input, and performs encryption change. The setting change information input by the user is generated in an e-mail, and the e-mail is encrypted using the input encryption key and sent to the portable terminal. Characterized in that it.
[0010]
More specifically, the mobile terminal generates an encryption key for encrypting the e-mail and a decryption key for decrypting the e-mail that is the setting change information of the mobile terminal encrypted with the encryption key. Key generation means, reception / decryption means for receiving and decrypting an electronic mail encrypted with the encryption key based on the decryption key from the information terminal device, and mail analysis means for analyzing the decrypted electronic mail And setting storage means for storing the contents of the setting change that is the analysis result, and the information terminal device interactively receives a setting change input by the user by displaying items that can be changed in the setting of the portable terminal. A setting change accepting means for accepting and requesting input of an encryption key, a mail generating means for generating setting change information inputted by the user in an e-mail, and input by the user Based on the encryption key, the generated the email and an encryption and transmission means for transmitting to the portable terminal encrypts.
[0011]
According to the present invention having such a feature, the setting of the portable terminal can be easily and safely changed from any device outside the terminal by encrypting the e-mail and sending the setting contents to the portable terminal. . Also, in order to improve the convenience for the user, if a program for automatically generating an e-mail for setting change data that realizes the setting desired by the user is prepared by an interactive operation, a personal operation that is easier than a portable terminal is possible. Settings can be safely changed by an information terminal device such as a computer.
[0012]
In this case, the key generation unit sets an expiration date of the generated decryption key, and the reception / decryption unit receives the encrypted e-mail from the information terminal device and decrypts the e-mail. It is possible to configure so that the expiration date is confirmed and decryption is performed only when the expiration date is within the expiration date. Further, the pre-reception / decryption means can be configured to delete the e-mail before decryption when the expiration date has expired.
[0013]
That is, when an electronic mail is encrypted, an encryption key is generated on the mobile terminal side, and this encryption key (password character string) is displayed on the screen and stored in the mobile terminal. Then, when the setting change item of the mobile terminal is encrypted on the information terminal device side, it is encrypted in a format that can be decrypted by the mobile terminal, using the encryption key displayed on the screen. On the other hand, on the mobile terminal side, an expiration date is provided for the decryption key corresponding to this encryption key, and the decryption key that has passed the expiration date is automatically deleted. Then, the mail encrypted only with the stored encryption key is decrypted using the corresponding decryption key.
[0014]
Thereby, even if the setting is changed using electronic mail, the risk that the encryption is analyzed and the setting is falsified can be reduced. Further, when the user does not change the setting from the outside of the terminal, the risk of a third party changing the setting from the outside of the terminal can be completely eliminated.
[0015]
In order to achieve the above object, a mobile terminal setting change method using e-mail according to the present invention is a mobile terminal setting change method using a mobile terminal and an information terminal device such as a personal computer. On the terminal side, a key generation step for generating an encryption key for encrypting an e-mail and a decryption key for decrypting an e-mail that is the setting change information of the mobile terminal encrypted with the encryption key; and the information terminal On the device side, the setting change accepting step for displaying the setting changeable item of the portable terminal and receiving the user's setting change input and requesting the input of the encryption key, and the information input on the information terminal device side by the user A mail generation stage for generating setting change information into an e-mail, and at the information terminal device side, based on an encryption key input by a user, the generated power An encryption / transmission step of encrypting and transmitting mail to the mobile terminal, and receiving on the mobile terminal side an e-mail encrypted with the encryption key from the information terminal device and receiving based on the decryption key A reception / decryption stage for decrypting the received e-mail, a mail analysis stage for analyzing the decrypted e-mail on the mobile terminal side, and a setting for saving the contents of the setting change as an analysis result on the mobile terminal side And a preservation stage. In this case, the key generation step includes a step of setting an expiration date of the generated decryption key, and the reception / decryption step decrypts when receiving the encrypted electronic mail from the information terminal device. A step of confirming the expiration date may be included, and decryption may be performed only when the expiration date is within the expiration date.
[0016]
Furthermore, in order to achieve the above object, the setting change data generation program of the present invention is a computer-readable setting change data for generating an e-mail for setting change data for changing a setting item of a portable terminal by an information terminal device. A generation program that interactively accepts a user setting change input by displaying items that can be changed in the setting of the mobile terminal, and requests input of an encryption key for encrypting an e-mail generated by the mobile terminal A setting change acceptance step, a mail generation step for generating setting change information input by the user in an email, an encryption step for encrypting the generated email based on the encryption key input by the user, A transmission step of transmitting the encrypted electronic mail to the portable terminal.
[0017]
The setting item changing program of the present invention is a computer-readable setting item changing program for executing setting item changing processing in a portable terminal that has received an e-mail for setting change data generated on the information terminal device side. A key generation step of generating a decryption key for decrypting the electronic mail, which is an encryption key for encrypting the electronic mail and setting change data of the mobile terminal encrypted by the encryption key; A reception step of receiving an electronic mail encrypted with the encryption key on the information terminal device side, a decryption step of decrypting the received electronic mail based on the decryption key, and a mail analysis for analyzing the decrypted electronic mail And a setting storage step for storing the contents of the setting change as an analysis result. In this case, the key generation step includes a step of setting an expiration date of the generated decryption key, and the decryption step is performed when the encrypted electronic mail is received from the information terminal device. The method may include a step of confirming the expiration date, and decryption may be performed only when it is within the expiration date.
[0018]
According to the program of the present invention having such characteristics, the setting change data generation program and the setting item change program of the present invention can be realized anywhere as long as there is a computer environment capable of executing the program. Furthermore, if this setting change data generation program can be executed by a general-purpose computer, it is necessary to prepare a dedicated computer environment in order to realize the portable terminal setting changing system using the e-mail of the present invention. The usefulness of the setting change data generation program of the present invention is enhanced.
[0019]
The setting change data generation program or the setting item change program can be provided by being recorded on a computer-readable recording medium. As described above, according to the recording medium on which the setting change data generation program or the setting item change program of the present invention is recorded, the setting change system of the present invention can be easily realized in various places and environments. The versatility of the setting change method can be improved.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
-Overview of the setting change system of this embodiment-
In the present embodiment, a setting change data generation program, which is an e-mail encryption program for converting a setting change e-mail into a ciphertext that can be decrypted by the target mobile terminal, by a mobile terminal manufacturer or a communication provider. provide. This setting change data generation program is preferably provided together with a program that acquires settings desired by the user by interactive operation and automatically generates an e-mail.
[0021]
The user uses this setting change data e-mail generation program to select a change item of an arbitrary setting item and generates a mail. This program displays a manual for setting items and enables interactive operation.
[0022]
The user operates the mobile terminal to generate an encryption key at the mobile terminal, and also generates a key necessary for decryption and stores it in the mobile terminal. The generated encryption key is displayed as a character string on the terminal screen. The user inputs the displayed encryption key into an encryption program installed in an information terminal device such as a personal computer, encrypts the electronic mail, and transmits it to the portable terminal. The decryption key has an expiration date, and the mobile terminal deletes the decryption key whose expiration date has passed.
[0023]
The mobile terminal that has received the encrypted email confirms whether or not the decryption key within the expiration date is stored in the mobile terminal. If the decryption key is stored, decryption is attempted. Here, when there is no decryption key, when the decryption key does not match and decryption fails, a message is displayed and the process is terminated. On the other hand, if the decryption is successful, the setting contents of the e-mail are analyzed. At this time, if the format or setting contents are inappropriate, a message is displayed and the process is terminated. If the setting content of the e-mail is normal, the setting of the mobile terminal is changed, a message is displayed, and the process is terminated.
[0024]
Embodiments of the present invention will be specifically described below with reference to the drawings.
[0025]
FIG. 1 shows the configuration of the setting change system of this embodiment.
[0026]
This setting change system includes a mobile terminal 1 and an information terminal device (hereinafter referred to as “personal computer”) 2, and constitutes a computer system including an arithmetic device, a storage device, a display device, and an input device, respectively. Each block in FIG. 1 is implemented as a program on these computer systems, and a setting change interface program 101, a key generation program 102, a decryption program 103, and a mail analysis program 104 are implemented on the portable terminal 1. A setting change interface program 206, a mail generation program 207, and an encryption program 208 are installed on the personal computer 2. In the figure, reference numeral 105 denotes a setting storage register, and 209 denotes a manual storage memory.
[0027]
The setting change interface 101 on the portable terminal 1 is activated by a user command, activates the key generation program 102 to generate an encryption key, and presents the generated encryption key to the user through a display device (not shown). When an encrypted e-mail for setting change arrives, the result of mail decryption / analysis is received and the result is presented to the user. If the analysis result is normal, the mail content setting information is written in the setting storage register 105 and reflected in the setting of the mobile terminal 1.
[0028]
The key generation program 102 receives a user command from the setting change interface program 101 and generates an encryption / decryption key. The generated encryption key is passed to the setting change interface program 101, and the decryption key is passed to the decryption program 103 with an expiration date set. The expiration date is set to a time sufficiently shorter than the time required for the analysis of the encryption by a general computer.
[0029]
The decryption program 103 receives the decryption key and the expiration date of the decryption key from the key generation program 102, and stores the decryption key together with the expiration date in a storage device (not shown). When an encrypted e-mail for setting change arrives, decryption is attempted with the stored decryption key. In this case, when the decryption is attempted, the expiration date is confirmed, and the decryption key whose expiration date has expired is deleted before the decryption is attempted. If the keys match and the decryption is successful, the decrypted mail is passed to the mail analysis program 104. On the other hand, if the decryption fails because the keys do not match, a message to that effect is passed to the setting change interface program 101.
[0030]
The mail analysis program 104 receives the decrypted mail and analyzes its contents. If the content matches the format of the terminal setting change mail, the setting change content is passed to the setting change interface program 101. On the other hand, if it does not match the format, a message to that effect is passed to the setting change interface program 101.
[0031]
The setting storage register 105 stores the settings of the mobile terminal 1 and can change the settings and states of the mobile terminal by changing the value.
[0032]
On the other hand, the setting change interface 206 on the personal computer 2 displays the setting items of the portable terminal 1 together with the manual stored in the manual storage memory 209 on a display device (not shown), and allows the user to change the setting interactively. provide. Then, the result changed by the user is passed to the mail generation program 207. The setting change interface 206 also provides an encryption key input interface and prompts the user to input an encryption key. Then, the input encryption key is transferred to the encryption program 208.
[0033]
The mail generation program 207 generates the data of the setting change item received from the setting change interface program 206 in a format that can be analyzed by the mail analysis program 104 of the mobile terminal 1 and passes it to the encryption program 208.
[0034]
The encryption program 208 receives the mail generated by the mail generation program 207 and the encryption key input from the setting change interface program 206, and encrypts the mail. Then, the encrypted setting change e-mail is transmitted to the e-mail address of the portable terminal 1.
[0035]
The encrypted electronic mail is transferred to the mobile terminal 1 via the Internet network N. However, in the case of a communication device such as a mobile phone, it may be via a wireless communication network of a communication carrier.
[0036]
Next, a processing procedure for changing the setting of the portable terminal 1 using the setting change system having the above configuration will be described with reference to the flowchart shown in FIG.
[0037]
When changing the setting of the mobile terminal 1, the user first generates an encryption key and a decryption key using the mobile terminal 1 (step S11). That is, when a key generation command is input to the mobile terminal 1, the setting change interface program 101 activates the key generation program 102 to generate an encryption key and a decryption key, and the generated encryption key is sent to the setting change interface program 101. In addition, the expiration date of the decryption key is set.
[0038]
Thereafter, the key generation program 102 confirms the expiration date of the decryption key (step S12) and monitors whether an electronic mail is received from the personal computer 2 (step S14). As a result, when the expiration date of the decryption key has passed, the operation proceeds from step S12 to step S13, and the decryption key is deleted at that time (step S13). In this case, the generated encryption key is also deleted.
[0039]
On the other hand, the user operates the personal computer 2 to select a setting change item (step S21).
[0040]
That is, the setting change interface 206 displays the items whose settings can be changed on the portable terminal 1 together with the manual stored in the manual storage memory 209 on a display device (not shown). The user selects a setting change item according to this display content.
[0041]
As a result, the selected setting change item data is passed to the mail generation program 207. The mail generation program 207 generates the setting change item data in a format that can be analyzed by the mail analysis program 104 of the mobile terminal 1 (step S22), and passes it to the encryption program 208.
[0042]
Also, the setting change interface 206 requests the user to input an encryption key, and passes the input encryption key to the encryption program 208 (step S23).
[0043]
The encryption program 208 receives the mail generated by the mail generation program 207 and the encryption key input from the setting change interface program 206, and encrypts the mail (step S24). Then, the encrypted setting change e-mail is transmitted to the e-mail address of the portable terminal 1 (step S25), and the process ends.
[0044]
On the other hand, when the mobile terminal 1 receives the encrypted electronic mail (when it is determined Yes in step S14), the decryption program 103 tries to decrypt with the stored decryption key (step S15). In this case, when the decryption is attempted, the expiration date is confirmed. If the decryption key has expired (that is, the keys do not match), the operation proceeds from step S15 to step S18, and the decryption is attempted. The e-mail is deleted before, and a message to that effect is passed to the setting change interface program 101 and displayed on the display device (step S18).
[0045]
On the other hand, if the keys match and the decryption is successful, the operation proceeds from step S15 to step S16, and the decrypted mail is passed to the mail analysis program 104. The mail analysis program 104 receives the decrypted mail and analyzes the content (step S16). If the content matches the format of the portable terminal 1, the operation proceeds from step S16 to step S17, and the setting change content is passed to the setting change interface program 101. The setting change interface program 101 changes the setting of the portable terminal 1 in accordance with the setting change content (step S17), displays a message, and ends the process. If the formats do not match, the operation proceeds from step S16 to step S19, and a message to that effect is passed to the setting change interface program 101 and displayed on the display device.
[0046]
-Program and recording medium-
The setting change system described above is realized by a setting change data generation program on the personal computer side and a setting item change program on the portable terminal side for performing processing for changing setting items of the portable terminal by a computer. As a result, the setting change system of the present invention can be realized anywhere as long as there is a computer environment capable of executing the setting change data generation program and the setting item change program.
[0047]
The subject of the invention may be the program itself, or the program stored in a computer-readable recording medium.
[0048]
In the present invention, as the recording medium, a memory necessary for processing by the microcomputer, such as a ROM itself, may be a program medium, or a program as an external storage device (not shown). It may be a program medium provided with a reading device and readable by inserting a recording medium therein. In any case, the stored program may be configured to be accessed and executed by the microcomputer, or in any case, the program is read out, and the read program is stored in the program storage area of the microcomputer. The program may be loaded and executed by the program. It is assumed that this loading program is stored in the main device in advance.
[0049]
Here, the program medium is a recording medium configured to be separable from the main body, such as a tape system such as a magnetic tape or a cassette tape, a magnetic disk such as an FD (flexible disk) or HD (hard disk), or a CD-ROM / Supports fixed programs including optical disks such as MO / MD / DVD, card systems such as IC cards (including memory cards) / optical cards, and semiconductor memories such as mask ROM, EPROM, EEPROM, flash ROM, etc. It may be a medium.
[0050]
Further, in the present invention, since the system configuration is connectable to a communication network including the Internet, the medium may be a medium that dynamically carries the program so as to download the program from the communication network. When the program is downloaded from the communication network in this way, the download program may be stored in the apparatus main body in advance or may be installed from another recording medium. The content stored in the recording medium is not limited to a program, and may be data.
[0051]
Furthermore, in the present invention, the program itself may be a process executed by a microcomputer, or may be acquired by accessing a communication network including the Internet, or may be acquired. You may send out from. Furthermore, a result obtained by processing in the setting change system based on the fetched program, that is, a generated result may be used. Alternatively, it may be generated as a result of being processed in the setting change system when it is sent out from here. In addition, these things are not limited to a program, Data may be sufficient.
[0052]
Accordingly, it becomes easy to implement the setting change system of the present invention in various places and environments without the need for a physical recording medium, and the versatility of the setting change system of the present invention can be further enhanced.
[0053]
【The invention's effect】
As described above, according to the present invention, the setting of the portable terminal can be changed by an arbitrary external device such as a personal computer having a richer user interface than the portable terminal, and the operation for changing the setting is easily performed. It becomes possible. In addition, by encrypting the transmission path of the setting change data, it is possible to reliably prevent the third party from viewing and tampering with the setting contents.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an embodiment of a setting change system of the present invention.
FIG. 2 is a flowchart showing a processing procedure for changing the setting of the mobile terminal using the setting change system of the present invention.
[Explanation of symbols]
1 Mobile device
2 Information terminal equipment (personal computer)
101 Setting change interface program
102 Key generation program
103 Decryption program
104 Mail analysis program
105 Setting save register
206 Setting change interface program
207 Mail generation program
208 Encryption program
209 Manual storage memory

Claims (11)

A mobile terminal setting change system comprising a mobile terminal and an information terminal device such as a personal computer,
The mobile terminal generates an encryption key for encrypting the e-mail and a decryption key for decrypting the e-mail that is the setting change information of the mobile terminal encrypted by the encryption key, and based on the decryption key While decrypting the e-mail encrypted with the encryption key and performing e-mail analysis to change the setting of the mobile terminal,
The information terminal device displays a setting changeable item of the mobile terminal and accepts a user setting change input, requests an input of an encryption key, generates setting change information input by the user in an e-mail, A mobile terminal setting change system using electronic mail, wherein the electronic mail is encrypted using an input encryption key and transmitted to the mobile terminal. A mobile terminal setting change system comprising a mobile terminal and an information terminal device such as a personal computer,
The portable terminal is
An encryption key for encrypting the e-mail, and a key generation means for generating a decryption key for decrypting the e-mail that is the setting change information of the mobile terminal encrypted by the encryption key;
Receiving / decrypting means for receiving and decrypting an e-mail encrypted with the encryption key from the information terminal device based on the decryption key;
A mail analysis means for analyzing the decrypted email;
A setting storage means for storing the contents of the setting change as an analysis result,
The information terminal device
A setting change accepting unit that interactively accepts a user's setting change input by displaying an item in which the setting of the mobile terminal can be changed, and requests an input of an encryption key;
Mail generation means for generating setting change information input by the user into an email;
A mobile terminal setting change using electronic mail, comprising: an encryption / transmission unit that encrypts the generated electronic mail based on an encryption key input by a user and transmits the encrypted electronic mail to the mobile terminal system. The mail generation unit generates information on the setting change item input by the user in an e-mail according to a format that can be analyzed by the mail analysis unit, and the mail analysis unit is decrypted by the decryption unit. 3. The mobile terminal setting changing system according to claim 2, wherein the e-mail is analyzed only when the format of the e-mail is a format that can be analyzed. The key generation unit sets an expiration date of the generated decryption key, and the reception / decryption unit receives the encrypted email from the information terminal device and decrypts the expiration date when decrypting it. The system for changing a setting of a mobile terminal using an e-mail according to claim 2, wherein the decryption is performed only when it is confirmed and within the expiration date. 5. The mobile phone using electronic mail according to claim 4, wherein the pre-reception / decryption means deletes the electronic mail before decryption when the expiration date has passed when decrypting. Terminal setting change system. A method for changing the setting of a mobile terminal using a mobile terminal and an information terminal device such as a personal computer,
On the mobile terminal side, a key generation stage for generating an encryption key for encrypting the email and a decryption key for decrypting the email that is the setting change information of the mobile terminal encrypted with the encryption key;
On the information terminal device side, a setting change accepting step for displaying a setting changeable item of the mobile terminal and receiving a user setting change input and requesting an input of an encryption key;
On the information terminal device side, a mail generation stage for generating setting change information input by the user into an email,
On the information terminal device side, an encryption / transmission step of encrypting the generated e-mail and transmitting it to the mobile terminal based on an encryption key input by a user;
On the portable terminal side, an e-mail encrypted with the encryption key is received from the information terminal device, and a reception / decryption step of decrypting the received e-mail based on the decryption key;
On the mobile terminal side, a mail analysis stage for analyzing the decrypted email,
A method for changing the setting of a portable terminal using e-mail, comprising: a setting saving step for saving the contents of the setting change as an analysis result on the portable terminal side. The key generation step includes a step of setting an expiration date of the generated decryption key, and the reception / decryption step receives the encrypted e-mail from the information terminal device and decrypts the e-mail. 7. The method for changing a setting of a mobile terminal using an e-mail according to claim 6, further comprising a step of confirming an expiration date, and performing decryption only when the expiration date is within the expiration date. A computer-readable setting change data generation program for generating an e-mail for setting change data for changing a setting item of a mobile terminal in an information terminal device,
A setting change accepting step for interactively accepting a user's setting change input by displaying items that can be changed in the setting of the portable terminal, and requesting an input of an encryption key for encrypting an e-mail generated by the portable terminal; ,
A mail generation step for generating the setting change information input by the user into an email;
An encryption step for encrypting the generated email based on the encryption key entered by the user;
A setting change data generation program comprising: a transmission step of transmitting an encrypted electronic mail to the portable terminal. A computer-readable setting item change program for executing setting item change processing in a mobile terminal that has received an e-mail for setting change data generated on the information terminal device side,
A key generation step for generating a decryption key for decrypting the electronic mail, which is an encryption key for encrypting the electronic mail and setting change data of the mobile terminal encrypted with the encryption key;
A receiving step of receiving an e-mail encrypted with the encryption key on the information terminal device side;
A decryption step of decrypting the received electronic mail based on the decryption key;
An email analysis step for analyzing the decrypted email;
A setting item changing program comprising: a setting saving step for saving the contents of the setting change as an analysis result. The key generation step includes a step of setting an expiration date of the generated decryption key, and the decryption step receives the encrypted electronic mail from the information terminal device and decrypts the expiration date. The setting item changing program according to claim 9, further comprising: a step of confirming and performing decryption only when it is within an expiration date. A computer-readable recording medium recording the setting change data generation program according to claim 8, the setting item change program according to claim 9, or the setting item change program according to claim 10.

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