JP7469663B2 - Setting information change system, terminal - Google Patents

Description

The present invention relates to a setting information changing system in which setting information set in a terminal is changed by a server, and to a terminal provided in the system.

In some cases, various configuration information must be set in the terminal to operate it. For example, wireless LAN settings and passwords are examples of configuration information, and the configuration information may be numbers, letters, symbols, or a combination of these.

In order to reduce the labor required for setting configuration information on a terminal, a technique is known in which the configuration information of one terminal is copied to another terminal via a server. Patent Document 1 discloses that the configuration information is encrypted when it is sent from the terminal to the server.

JP 2018-202708 A

The configuration information is encrypted as a file (hereafter referred to as the configuration information file). The configuration information file includes a section that describes the file format, and one or more pieces of configuration information are written in a format that conforms to the file format.

It is also conceivable that a server may wish to change the setting information contained in the setting information file sent from the terminal before providing the setting information file to another terminal. Since the setting information file is encrypted, it is conceivable to send an encryption key from the terminal to the server in order to decrypt the setting information file at the server. However, sending an encryption key from the terminal to the server creates the risk of the encryption key being leaked to a third party. Therefore, outputting the encryption key from the terminal to an external device reduces security. If the setting information file were sent without encryption, there would be no need to send an encryption key. However, sending the setting information file without encryption would also reduce security.

The present disclosure has been made based on these circumstances, and its purpose is to provide a setting information change system and terminal that can change setting information at a server and store the changed setting information file in the server while minimizing a decrease in security.

The above object is achieved by a combination of features as recited in the independent claims, and the subclaims define further advantageous specific examples. The reference characters in parentheses in the claims indicate a correspondence with the specific aspects described in the embodiments described below as one aspect, and do not limit the disclosed technical scope.

One disclosure of a setting information change system for achieving the above object is:
A setting information change system including a terminal (10) that operates with setting information set therein, and a server (20) that changes the setting information and provides it to other terminals,
The terminal is
A terminal communication unit (12) that communicates with a server;
a setting information file processing unit (18) that includes a portion describing a file format, generates a setting information file in which one or more pieces of setting information are described in a format conforming to the file format, encrypts the generated setting information file, and transmits the encrypted file from a terminal communication unit to a server;
A setting data processing unit (19) that transmits setting data indicating setting information in plain text from the terminal communication unit to the server,
The server
A server communication unit (21) for communicating with the terminal;
a server control unit (26) that acquires setting data from the terminal via a server communication unit, changes setting information indicated by the acquired setting data, and transmits setting data indicating the changed setting information in plain text from the server communication unit to the terminal;
The setting information file processing unit provided in the terminal acquires the setting data sent from the server from the terminal communication unit, generates a setting information file containing setting information indicated by the acquired setting data, encrypts the generated setting information file, and transmits it from the terminal communication unit to the server.

The terminal transmits setting data indicating the setting information in plain text to the server. Because the server can obtain unencrypted setting data, it can change the setting information without an encryption key. Because the setting information can be changed on the server in this way, the terminal does not need to output an encryption key to the outside. Furthermore, although the setting data is transmitted in plain text from the terminal to the server, because the setting data indicates the setting information itself, the server only temporarily stores the setting data in RAM or the like when changing the setting information. The temporarily stored setting data is erased from the server, for example, when the application that changes the setting information is terminated. In other words, unlike a setting information file, the setting data is not stored on the server for a long period of time. This also helps prevent a decrease in security.

Furthermore, the terminal acquires the setting data sent by the server, generates and encrypts a setting information file including the setting information indicated by the setting data, and sends the file to the server. Therefore, even if the server does not have an encryption key, the server can hold an encrypted setting information file that describes the setting information changed by the server.

In the setting information change system, preferably,
The setting information file processing unit:
A current setting process (ST2) for generating a setting information file from the setting information set in the terminal, encrypting the generated setting information file, and transmitting the file from the terminal communication unit to the server;
a post-change setting process (ST4) of acquiring the setting data transmitted from the server, generating a setting information file including setting information indicated by the setting data, encrypting the generated setting information file, and transmitting the file from the terminal communication unit to the server;
The server includes a server storage unit (23) for storing a setting information file transmitted from a terminal when a setting information file processing unit of the terminal is currently executing setting processing.

According to this configuration, a setting information file that describes the setting information set in the terminal as is is stored in the server storage unit. Therefore, when the setting information set in the terminal only needs to be provided to another terminal without modification, this configuration makes it easy to provide the setting information set in the terminal to the other terminal.

Furthermore, in the setting information change system, preferably,
The server control unit acquires a setting information file for changing the setting information from the server storage unit, and transmits the acquired setting information file from the server communication unit to the terminal;
The setting data processing unit decrypts the setting information file received by the terminal communication unit from the server, and transmits setting data indicating the setting information extracted from the decrypted setting information file in plain text from the terminal communication unit to the server.

Since the setting information file is stored in the server storage unit, even if it becomes necessary to change the setting information described in the setting information file, the setting information file that requires the setting information to be changed can be retrieved from the server storage unit at the required time and sent to the terminal.

When the terminal receives a setting information file from the server, the setting data processing unit decrypts the setting information file and transmits setting data indicating the setting information extracted from the decrypted setting information file in plain text to the server.

As a result, even if it becomes necessary to change the setting information described in the setting information file stored in the server storage unit, the server control unit can change the setting information and provide the setting information file after the setting information has been changed to the specified terminal.

Furthermore, in the setting information change system, preferably,
The setting data processing unit acquires authentication information from the operator of the terminal, and decrypts the setting information file on condition that authentication based on the authentication information has been successful.

After the setting information file is decrypted on the terminal, it exists in plain text on the terminal. If the setting information file contains confidential setting information such as a password, there is a risk that the information may be visible to the person operating the terminal. Therefore, if the terminal is stolen, there is a risk that the confidential setting information may become known to a third party. Therefore, the setting information file is decrypted on the condition that authentication using the authentication information has been successful. This makes it possible to prevent confidential setting information such as a password from becoming known to a third party on the terminal, even if the terminal is stolen.

In the setting information change system,
The setting data processing unit may acquire setting information set in the terminal, and transmit setting data indicating the acquired setting information in plain text from the terminal communication unit to the server.

If the server does not need to hold a configuration information file that describes the current configuration information, the server can still hold the configuration information file after the configuration information has been changed.

One disclosure relating to a terminal for achieving the above object is a terminal included in the setting information change system. That is, the terminal includes:
A terminal (10) that operates with setting information set therein,
A terminal communication unit (12) that communicates with a server;
a setting information file processing unit (18) that includes a portion describing a file format, generates a setting information file in which one or more pieces of setting information are described in a format conforming to the file format, encrypts the generated setting information file, and transmits the encrypted file from a terminal communication unit to a server;
A setting data processing unit (19) that transmits setting data indicating setting information in plain text from the terminal communication unit to the server,
When setting data indicating changed setting information is sent from the server and the setting data is received by the device communication unit, the setting information file processing unit acquires the setting data from the device communication unit, generates a setting information file including the setting information indicated by the acquired setting data, encrypts the generated setting information file, and transmits it from the device communication unit to the server.

1 is a diagram showing a configuration of a setting information change system 1 according to an embodiment. FIG. 2 is a block diagram showing the configuration of a terminal 10. FIG. 2 is a block diagram showing the configuration of a server 20. FIG. 4 is a diagram showing a process performed when a setting change application program 24 is executed. FIG. 5 is a diagram showing detailed processing of the current setting process (ST2) in FIG. 4; FIG. 5 is a diagram showing detailed processing of the setting data processing (ST3) in FIG. 4; FIG. 5 is a diagram showing detailed processing of the post-change setting process (ST4) of FIG. 4; FIG. 11 is a diagram showing a process executed in ST3 in the second embodiment. FIG. 13 is a diagram showing processes executed by a terminal control unit 16 and a server control unit 26 in the third embodiment. FIG. 10 is a diagram showing detailed processing of the setting data processing (ST23) of FIG. 9;

First Embodiment
Hereinafter, an embodiment will be described with reference to the drawings. FIG. 1 is a diagram showing a configuration of a setting information change system 1 according to the present embodiment. The setting information change system 1 includes a terminal 10 and a server 20. The terminal 10 is an optical information reading device that optically reads information codes such as barcodes and two-dimensional codes. The terminal 10 shown in FIG. 1 is a smartphone type terminal and includes a display unit 11. An operation screen, information obtained by decoding the information code, and the like are displayed on the display unit 11.

In order to operate the terminal 10, various setting information must be set. The setting information includes wireless LAN settings, launcher function settings, passwords, etc. Although only one terminal 10 is shown in FIG. 1, there is no limit to the number of terminals 10. The terminal 10 is for business use, and multiple terminals may be used.

If the setting information set on one terminal 10 can be copied to other terminals 10, the work of setting the setting information on the other terminals 10 can be reduced. In addition to simply copying the setting information, there may be cases where it is necessary to provide the setting information to the other terminals 10 after changing part of the setting information. For example, there is a high possibility that a password will want to be changed for each terminal 10.

The server 20 is a device for providing setting information set in one terminal 10 to other terminals 10. The terminals 10 and the server 20 can communicate with each other via wireless communication. Note that the terminals 10 and the server 20 may also be connectable via wired communication.

[Configuration of terminal 10]
Next, a description will be given of the configuration of the terminal 10. Fig. 2 is a block diagram showing the configuration of the terminal 10. The terminal 10 includes a display unit 11, a terminal communication unit 12, a camera 13, a terminal storage unit 14, an operation unit 15, and a terminal control unit 16.

As described above, the display unit 11 displays an operation screen, information obtained by decoding an information code, and the like. The terminal communication unit 12 wirelessly communicates with the server 20. The wireless communication method implemented by the terminal communication unit 12 is at least one of short-range wireless communication and wide-area wireless communication.

The camera 13 is for photographing the information code. The terminal 10 may be equipped with lighting to make it easier to photograph the information code. The terminal storage unit 14 is a non-volatile memory such as a flash memory. The terminal storage unit 14 stores various information such as the setting information described above and an encryption key required to decrypt an encrypted setting information file.

The operation unit 15 is a touch panel or the like superimposed on the display surface of the display unit 11, and is operated by the operator when inputting various information into the terminal 10. Note that part or all of the operation unit 15 may be mechanical keys.

The terminal control unit 16 can be realized by a computer equipped with a processor, non-volatile memory, RAM, I/O, and a bus line connecting these components. The terminal control unit 16 is communicatively connected to the display unit 11, the terminal communication unit 12, the camera 13, the terminal storage unit 14, and the operation unit 15, and controls them.

The non-volatile memory stores a program for operating a general-purpose computer as the terminal control unit 16. The processor executes the program stored in the non-volatile memory while utilizing the temporary storage function of the RAM, causing the terminal control unit 16 to operate as a reading processing unit 17, a setting information file processing unit 18, and a setting data processing unit 19. The execution of these operations means that a method corresponding to the program is being executed.

The reading processing unit 17 acquires image data representing the image captured by the camera 13, performs image analysis on the image data, and decodes the code stored in the information code included in the image. The processing performed by the setting information file processing unit 18 and the setting data processing unit 19 will be described later with reference to FIG. 4.

[Configuration of server 20]
Next, the configuration of the server 20 will be described. Fig. 3 is a block diagram showing the configuration of the server 20. The server 20 includes a server communication unit 21, a display unit 22, a server storage unit 23, an operation unit 25, and a server control unit 26. The server 20 can be realized by, for example, a general personal computer.

The server communication unit 21 wirelessly communicates with the terminal communication unit 12 included in the terminal 10. The display unit 22 displays an operation screen for changing setting information, etc. The server storage unit 23 includes a non-volatile storage medium. The non-volatile storage medium is a flash memory, a hard disk, etc., and multiple types of storage media may be included. A setting change application program 24 is stored in the storage medium. The setting change application program 24 is a program that executes a function to change setting information. The operation unit 25 is a mechanical keyboard, a software keyboard, etc., and is operated by the operator when inputting various information to the server 20.

The server control unit 26 is configured to include a processor, non-volatile memory, RAM, I/O, and a bus line connecting these components. The server control unit 26 is communicatively connected to the server communication unit 21, the display unit 22, the server storage unit 23, and the operation unit 25, and controls them.

The processor of the server control unit 26 executes the setting change application program 24 while utilizing the temporary storage function of the RAM. The processing performed when this setting change application program 24 is executed will be described with reference to FIG. 4.

[Processing when the setting change application program 24 is executed]
Next, the process when the setting change application program 24 is executed will be described with reference to Fig. 4. The process shown in Fig. 4 starts when a preset start condition is met. The start condition is, for example, that a start operation is performed on the terminal 10 or the server 20.

In FIG. 4, ST1 to ST4 are processes executed by the terminal control unit 16, and SS1 to SS10 are processes executed by the server control unit 26. In addition, ST2 and ST4 are executed by the setting information file processing unit 18, and ST3 is executed by the setting data processing unit 19.

In ST1, the terminal communication unit 12 is connected to the server communication unit 21. ST1 only needs to be executed prior to the processing from ST2 onwards, and does not need to be executed consecutively with the processing from ST2 onwards. When ST1 is executed, at the same time, the server control unit 26 connects the server communication unit 21 to the terminal communication unit 12 in SS1.

In ST2, the current setting process is executed. The current setting process is shown in detail in FIG. 5. In FIG. 5, in ST21, setting information is obtained from the terminal storage unit 14. Typically, multiple types of setting information are set in the terminal 10. The setting information obtained in ST21 is some or all of that information, and it is specified each time or in advance which type of setting information is to be obtained.

In the next step ST22, a setting information file is generated. The setting information file includes a section describing the file format, and is a file in which the setting information acquired in S21 is described in a format conforming to the file format. In ST23, the setting information file generated in ST22 is encrypted. In ST24, the setting information file encrypted in ST23 is sent to the server 20.

Referring back to FIG. 4 for the explanation, the encrypted setting information file is received by the server communication unit 21 as a result of ST2 being executed. The server control unit 26 acquires the setting information file from the server communication unit 21 at SS2. The server control unit 26 stores the acquired setting information file in the server storage unit 23.

In FIG. 4, SS2 and SS3 are consecutive. However, it may be sufficient to provide the setting information file acquired in SS2 to another terminal 10 without modification. In this case, it is not necessary to execute SS3 immediately after SS2.

If there is no need to change the setting information file, the setting information file stored in the server storage unit 23 can be provided to the terminal 10 that needs to be provided as needed. Then, when it becomes necessary to change the setting information described in the setting information file, SS3 and subsequent steps can be executed.

In SS3, the setting change application program 24 is started. Note that the setting change application program 24 may be started before the server 20 and the terminal 10 are connected.

In SS4, the change of the setting information begins. This process is performed when the person operating the server 20 performs an operation to change the setting information. When the change operation is performed, a screen for changing the necessary parts of the setting information is displayed on the display unit 22. However, the setting information file acquired in S22 is encrypted, and the server control unit 26 has not acquired the encryption key. Therefore, although the screen for changing the setting information can be displayed on the display unit 22, the setting information cannot be displayed on the display unit 22.

In this case, in SS5, a setting information file for changing the setting information is obtained from the server storage unit 23, and the setting information file is sent from the server communication unit 21 to the terminal 10. Note that multiple setting information files may be stored in the server storage unit 23. For example, when setting information files are obtained from multiple terminals 10, multiple setting information files may be stored in the server storage unit 23. When multiple setting information files are stored in the server storage unit 23, a setting information file in which the setting information that needs to be changed is described is selected based on the operator's operation and sent to the terminal 10. Note that when the setting change application program 24 is started, the following process is executed by connecting to a terminal 10 that can decrypt the setting information file, for example, the terminal 10 that provided the setting information file.

The setting information file sent from the server 20 is received by the device communication unit 12. The terminal control unit 16 then executes setting data processing (ST3). The details of the setting data processing (ST3) are shown in FIG. 6. In FIG. 6, in ST31, the setting information file is acquired from the device communication unit 12.

In ST32, the encryption key stored in the terminal storage unit 14 is used to decrypt the setting information file acquired in ST31. In ST33, setting information is extracted from the decrypted setting information file. In ST34, setting data indicating the setting information extracted in ST33 is transmitted in plain text from the terminal communication unit 12 to the server 20. For example, in packet communication, a packet having the setting data as a payload is generated and transmitted to the server 20.

Referring back to FIG. 4 for the explanation, the setting data transmitted from the terminal 10 when ST3 is executed is received by the server communication unit 21. The server control unit 26 acquires the setting data from the server communication unit 21 in SS6.

In the next step SS7, the setting information indicated by the setting data acquired in SS6 is displayed on the display unit 22. This allows the operator to easily change the setting information. In SS8, the setting information is updated by the operator's operation. In SS9, setting data indicating the updated setting information is sent in plain text from the server communication unit 21 to the terminal 10.

The setting data sent from the server 20 is received by the terminal communication unit 12. The terminal control unit 16 then executes post-change setting processing (ST4). Detailed processing of the post-change setting processing (ST4) is shown in FIG. 7. In FIG. 7, in ST41, setting data is acquired from the terminal communication unit 12. In ST42, a setting information file is generated that reflects the setting information indicated by the setting data acquired in ST41. In ST43, the setting information file generated in ST42 is encrypted. In ST44, the setting information file encrypted in ST43 is transmitted to the server 20.

Referring back to FIG. 4 for the explanation, by executing ST4, the changed setting information is written, and the encrypted setting information file is received by the server communication unit 21. The server control unit 26 acquires the setting information file from the server communication unit 21 at SS10, and stores the acquired setting information file in the server storage unit 23.

Summary of the embodiment
According to the setting information change system 1 of the present embodiment described above, the terminal 10 transmits setting data indicating the setting information in plain text to the server 20 (ST34). Since the server 20 can obtain the setting data that is not encrypted (SS6), it can change the setting information without the encryption key (SS7, SS8). Since the setting information can be changed in the server in this way, the terminal 10 does not need to output the encryption key to the outside. In addition, the setting data is transmitted from the terminal 10 to the server 20 in plain text, but since the setting data is data indicating the setting information itself, the server 20 only temporarily stores the setting data in the RAM or the like when changing the setting information. The temporarily stored setting data is erased from the server 20 when the setting change application program 24 is terminated, etc. In other words, unlike the setting information file, the setting data is not data that is stored in the server 20 for a long period of time. Therefore, the deterioration of security can also be suppressed.

Furthermore, the terminal 10 acquires the setting data sent by the server 20 (ST41), generates and encrypts a setting information file including the setting information indicated by the setting data, and sends it to the server (ST4), and the server 20 saves the setting information file (SS10). Therefore, even without an encryption key, the server 20 can hold an encrypted setting information file that describes the setting information changed by the server 20.

In addition, in this embodiment, the terminal 10 executes a current setting process (ST2), encrypts a setting information file generated from the setting information set in the terminal 10, and transmits the encrypted setting information file to the server 20. The server 20 stores the setting information file in the server storage unit 23 (S22). Thus, a setting information file in which the setting information set in the terminal 10 is described as is is stored in the server storage unit 23. Therefore, when it is sufficient to provide the setting information set in the terminal 10 to another terminal 10 without changing it, the setting information set in the terminal 10 can be easily provided to the other terminal 10.

Furthermore, even if it becomes necessary to change the setting information described in the setting information file, the setting information file that requires the setting information to be changed can be retrieved from the server storage unit at the required timing and sent to the terminal (SS5).

When the terminal 10 receives a setting information file from the server 20, it decrypts the setting information file and transmits setting data indicating the setting information extracted from the decrypted setting information file in plain text to the server (ST3).

As a result, even if it becomes necessary to change the setting information described in the setting information file stored in the server storage unit 23, the server control unit 26 can change the setting information and provide the setting information file after the setting information has been changed to a specified terminal 10.

Second Embodiment
Next, a second embodiment will be described. In the following description of the second embodiment, elements having the same reference numbers as those used up to that point are the same as the elements having the same reference numbers in the previous embodiments, unless otherwise specified. Furthermore, when only a part of the configuration is described, the previously described embodiment can be applied to the other parts of the configuration.

In the second embodiment, the process shown in FIG. 8 is executed in the setting data process executed in ST3. The process shown in FIG. 8 is the same as the process shown in FIG. 6 except that ST31-1, ST31-2, and ST31-3 are added between ST31 and ST32.

After receiving the setting information file to be decrypted from the server 20 in ST31, the operator operating the terminal 10 is requested to input authentication information in ST31-1. The authentication information may be a password, a fingerprint, or the like. In ST31-2, the authentication information input by the operator is acquired. In ST31-3, the authentication information acquired in ST31-2 is compared with the authentication information already stored in the terminal storage unit 14 or the like to determine whether authentication has been successful. If the determination result in ST31-3 is NO, the process ends without decrypting the setting information file acquired in ST31. On the other hand, if the determination result in ST31-3 is YES, the process proceeds to ST32, and the setting information file acquired in ST31 is decrypted.

After ST32 is executed, the setting information file exists in a decrypted state. If the setting information file contains setting information that should be kept secret, such as a password, after ST32 is executed, the person operating the terminal 10 may be able to view the setting information that should be kept secret, such as the password.

Therefore, in this second embodiment, the operator of the terminal 10 is authenticated before the setting information file is decrypted. This makes it possible to prevent confidential setting information, such as passwords, from being discovered by a third party on the terminal 10 even if the terminal 10 is stolen.

Third Embodiment
In the third embodiment, the terminal control unit 16 and the server control unit 26 execute the process shown in Fig. 9 instead of Fig. 4. In the third embodiment, the terminal control unit 16 does not execute the current setting process (ST2), but executes the setting data process (ST23) after ST1. The details of ST23 are shown in Fig. 10.

In FIG. 10, ST231 is the same process as that executed in ST21 in the first embodiment, and acquires setting information from the terminal storage unit 14. In ST232, setting data indicating the setting information acquired in ST231 is transmitted in plain text from the terminal communication unit 12 to the server 20.

In SS6, the server control unit 26 acquires the setting data sent by the terminal 10. In this way, the server control unit 26 acquires the setting data, so in the third embodiment, the server control unit 26 does not need to execute SS5, which is the process of sending to the terminal 10 a setting information file describing the setting information to be changed. In the third embodiment, the processes from SS6 onwards by the server control unit 26 and the process of ST4 by the terminal control unit 16 are the same as in the first embodiment.

If the server 20 does not need to hold a setting information file that describes the current setting information of the terminal 10, the server 20 can hold the setting information file after changing the setting information, even if the third embodiment is used.

Although the embodiments have been described above, the disclosed technology is not limited to the above-mentioned embodiments, and can be implemented with various modifications without departing from the spirit and scope of the invention.

1: Setting information change system 10: Terminal 11: Display unit 12: Terminal communication unit 13: Camera 14: Terminal memory unit 15: Operation unit 16: Terminal control unit 17: Reading processing unit 18: Setting information file processing unit 19: Setting data processing unit 20: Server 21: Server communication unit 22: Display unit 23: Server memory unit 24: Setting change application program 25: Operation unit 26: Server control unit ST2: Current setting process ST4: Changed setting process

Claims (6)

A setting information change system comprising a terminal (10) in which setting information is set and operated, and a server (20) that changes the setting information and provides it to other terminals,
The terminal includes:
A terminal communication unit (12) that communicates with the server;
a setting information file processing unit (18) that includes a portion describing a file format, generates a setting information file in which one or more pieces of setting information are described in a format conforming to the file format, encrypts the generated setting information file, and transmits the encrypted file from the terminal communication unit to the server;
a setting data processing unit (19) that transmits setting data indicating the setting information in plain text from the terminal communication unit to the server;
The server,
A server communication unit (21) that communicates with the terminal;
a server control unit (26) that acquires the setting data from the terminal via the server communication unit, changes setting information indicated by the acquired setting data, and transmits the setting data indicating the changed setting information in plain text from the server communication unit to the terminal;
A setting information change system, wherein the setting information file processing unit provided in the terminal acquires the setting data sent from the server from the terminal communication unit, generates the setting information file including the setting information indicated by the acquired setting data, encrypts the generated setting information file, and transmits it from the terminal communication unit to the server. 2. The setting information change system according to claim 1,
The setting information file processing unit:
a current setting process (ST2) for generating the setting information file from the setting information set in the terminal, encrypting the generated setting information file, and transmitting the file from the terminal communication unit to the server;
a post-change setting process (ST4) of acquiring the setting data transmitted from the server, generating the setting information file including the setting information indicated by the setting data, encrypting the generated setting information file, and transmitting the setting information file from the terminal communication unit to the server;
The server includes a server storage unit (23) for storing the setting information file transmitted from the terminal by the setting information file processing unit of the terminal executing the current setting process. 3. The setting information change system according to claim 2,
the server control unit acquires from the server storage unit the setting information file for changing the setting information, and transmits the acquired setting information file from the server communication unit to the terminal;
A setting information change system in which the setting data processing unit decrypts the setting information file received by the terminal communication unit from the server, and transmits the setting data indicating the setting information extracted from the decrypted setting information file in plain text from the terminal communication unit to the server. 4. The setting information changing system according to claim 3,
The setting data processing unit acquires authentication information from an operator of the terminal, and decrypts the setting information file on condition that authentication using the authentication information has been successful. 2. The setting information change system according to claim 1,
A setting information change system in which the setting data processing unit acquires the setting information set in the terminal, and transmits the setting data indicating the acquired setting information in plain text from the terminal communication unit to the server. A terminal (10) that operates with setting information set therein,
A terminal communication unit (12) that communicates with a server;
a setting information file processing unit (18) that includes a portion describing a file format, generates a setting information file in which one or more pieces of setting information are described in a format conforming to the file format, encrypts the generated setting information file, and transmits the encrypted file from the terminal communication unit to the server;
a setting data processing unit (19) that transmits setting data indicating the setting information in plain text from the terminal communication unit to the server;
When the server sends setting data indicating changed setting information and the device communication unit receives the setting data, the setting information file processing unit acquires the setting data from the device communication unit, generates the setting information file including the setting information indicated by the acquired setting data, encrypts the generated setting information file, and transmits it from the device communication unit to the server.

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