JP7266727B2 - Communication device and its control method - Google Patents

Description

The present invention relates to a parameter setting technique in a communication device.

2. Description of the Related Art In recent years, electronic devices such as digital cameras, printers, mobile phones, and smart phones are increasingly equipped with wireless communication functions and used as communication devices by connecting to a wireless network. To connect an electronic device to a wireless network, it is necessary to set various communication parameters such as encryption method, encryption key, authentication method, and authentication key. Therefore, setting communication parameters is complicated and difficult for users of digital cameras and printers. Therefore, a mechanism for simplifying the setting of communication parameters is used. In addition, in order to prevent information leakage of communication parameters, etc., a mechanism is also used in which communication parameters are concealed by public key cryptography and notified to user terminals.

Patent Literature 1 discloses a technique for facilitating setting of communication parameters in a communication terminal by using a QR code (registered trademark) image containing communication parameter information. In the Wi-Fi (registered trademark) Alliance, public key information is provided to a communication terminal via a QR code image, etc., and communication parameters are provided to a communication terminal connected via a communication path using the public key. A DPP scheme is being considered. DPP is an abbreviation for Device Provisioning Protocol.

JP 2006-261938 A

However, when there are a plurality of communication parameter setting methods using QR code images, the QR code images corresponding to the number of methods are displayed. For example, two QR code images are displayed in a communication device compatible with two setting methods. Therefore, the user is confused as to which QR code image should be captured.

SUMMARY OF THE INVENTION The present invention has been made in view of such problems, and it is an object of the present invention to provide a technique capable of reducing the complexity of setting communication parameters.

In order to solve the above problems, the communication device according to the present invention has the following configuration. That is, the communication device is used in a first communication parameter setting method for setting communication parameters for connecting to a network , and displays a first image encoded with information including the communication parameters based on a user operation. Used in a first display control means and a second communication parameter setting method conforming to the DPP (Device Provisioning Protocol) standard for setting communication parameters for connecting to the network , without including the communication parameters second display control means for displaying a second image encoded with information including a public key of a communication device based on a user operation ; and reading the second image when displaying the second image. execution means for receiving information about the obtained public key from the external device that obtained the public key from the external device and executing authentication processing; and communication parameters for connecting the external device to the network if the authentication processing is successful. and providing means for providing the

ADVANTAGE OF THE INVENTION According to this invention, the technique which can reduce the complexity of a communication parameter setting can be provided.

1 is a diagram showing the overall configuration of a communication system according to a first embodiment; FIG. 3 is a block diagram showing the functional configuration of the printer; FIG. 4 is a flowchart of QR code image display processing in the first embodiment; It is a figure which shows an example of the selection screen of a setting method. FIG. 12 is a sequence diagram showing setting processing in the legacy method; FIG. 10 is a sequence diagram showing setting processing in the DPP method; 10 is a flowchart of another QR code image display process; FIG. 11 is a diagram showing an example of an OS version selection screen; 9 is a flowchart of QR code image display processing in the second embodiment;

An example of an embodiment of the present invention will be described in detail below with reference to the drawings. It should be noted that the following embodiments are merely examples and are not intended to limit the scope of the present invention.

(First embodiment)
As a first embodiment of a communication apparatus according to the present invention, a printer that forms a network based on a wireless LAN conforming to the IEEE802.11 series and accepts wireless connections from mobile devices will be described below as an example.

<System configuration and device configuration>
FIG. 1 is a diagram showing the overall configuration of a communication system according to the first embodiment. The communication system includes a printer 101 forming a wireless network 103 and a mobile device 102 connecting to the wireless network 103 .

The printer 101 has a wireless LAN function and operates, for example, as a configurator or access point defined by DPP. Printer 101 can form wireless network 103 as an access point. Also, the configurator can provide communication parameters for connecting to the wireless network 103 that it forms. Here, the communication parameters include setting items necessary for wireless communication such as SSID (Service Set Identifier) as a network identifier, encryption method, encryption key, and authentication method. The printer 101 can generate a code image in which communication parameters are encoded and a code image in which a public key used in DPP is encoded. In the following description, it is assumed that a QR code image is used as the code image.

The mobile device 102 has a wireless LAN function and operates as an enrollee defined by DPP, for example. In addition, the mobile device 102 has a camera and can photograph the surroundings of the mobile device 102 . Here, it is assumed that a setting application for setting parameters of the wireless LAN of the mobile device 102 is installed in the mobile device 102, and the setting application controls the camera to capture the surroundings. The mobile device 102 captures the QR code image displayed by the printer 101 with a camera, thereby obtaining encoded information, that is, communication parameters for connecting to the wireless network 103 and a public key used in DPP. can be done.

In the following description, a printer is used as a device forming a wireless network, and a mobile device is used as a device connected to the wireless network, but the devices are not limited to these. That is, it may be any communication device that has wireless network capabilities and need not be portable. Mobile devices include, but are not limited to, communication devices such as mobile phones, digital cameras, video cameras, PCs, PDAs, smart phones, and smart watches.

FIG. 2 is a block diagram showing the functional configuration of the printer 101. As shown in FIG. Here, it is assumed that each functional unit is realized by executing a program stored in a memory by a computer (processor). However, part or all of each function may be realized by dedicated hardware.

A wireless communication control unit 201 controls communication using an antenna, a circuit, and the like for transmitting and receiving wireless signals to and from another wireless device via a wireless LAN. The transmitting/receiving unit 202 performs data transmission/reception control according to the protocol of each communication layer.

An operation unit 203 receives an operation for the printer 101 from the user. An operation unit 203 includes a button and the like for starting connection processing to a wireless network. Note that the operation unit 203 may be configured with hardware (physical buttons, switches, etc.), or may be configured with a UI provided by software using the display unit 204 . The display unit 204 outputs visually and audibly recognizable information such as an LCD, an LED, or a speaker, and notifies the user of various kinds of information.

A control unit 205 is configured by one or more processors such as CPUs, and controls the printer 101 as a whole. The storage unit 206 includes one or more ROMs storing programs and data for controlling the printer 101 and one or more RAMs for temporary storage. Various operations in flowcharts to be described later are realized by executing a control program stored in the storage unit 206 to control each functional unit.

A code generator 207 generates a QR code image. Although the QR code image is used here as the code information image, a bar code image, other two-dimensional code image, or the like may be used.

A method determination unit 208 determines a setting method selected by the user via the operation unit 203 . Here, the setting method means a method for providing wireless LAN parameters to an external device (for example, mobile device 102). Here, it is assumed that the “legacy method” and the “DPP method” can be used as setting methods.

Here, the legacy method is a method of providing a QR code image obtained by encoding information including communication parameters to an external device and connecting it. The DPP method is a method of providing a QR code image obtained by encoding information including a public key related to the printer 101 (unique to the printer 101) to an external device for connection. Specifically, the external device uses the acquired public key to transmit an authentication request to the printer 101 and receives communication parameters from the printer 101 via an encrypted communication path. That is, the public key included in the QR code image is used as authentication information for authentication.

Note that other setting methods may be used. For example, a method of providing a QR code image obtained by encoding information required for connection by Wi-Fi Direct (registered trademark) to an external device for connection may be used.

A communication parameter processing unit 209 performs processing for providing communication parameters for connecting to the wireless network 103 . The IP address processing unit 210 performs processing for setting the IP address of the printer 101 itself and processing for distributing the IP address to the mobile device 102 connected to the wireless network 103 .

It should be noted that the division of roles among the functional units described above is merely an example. The two or more functional units described above may be configured as one functional unit, and the one functional unit described above may be configured as two or more functional units.

<Device operation>
FIG. 3 is a flowchart of QR code image display processing in the first embodiment. Specifically, the printer 101 that provides the communication parameters displays the QR code image based on the setting method selected by the user. The processing in FIG. 3 is started when the printer 101 receives an instruction to start connection processing to the wireless network from the user via the operation unit 203 . In the first embodiment, a case will be described in which the printer 101 has not established the wireless network 103 when the mobile device 102 starts setting communication parameters.

In S301, the printer 101 confirms that the user has pressed a button for starting connection processing to the wireless network. After confirming the start instruction from the user, the process proceeds to S302.

In S302, the printer 101 controls the IP address processing unit 210 to set the IP address to the printer 101 itself. Here, the IP address may be preset by the user or determined autonomously by the printer 101 .

In S303, the printer 101 controls the wireless communication control unit 201 to form the wireless network 103 and start operating as an access point. Note that the operation as an access point in S303 includes starting the operation as a P2P Group Owner when executing Wi-Fi Direct. Parameters such as SSID (Service Set Identifier), encryption method, encryption key, and authentication method of the wireless network 103 may be set in advance by the user, or may be determined autonomously by the printer 101. may be used.

In S304, the printer 101 controls the code generation unit 207 to generate a legacy QR code image. In S305, the printer 101 controls the code generation unit 207 to generate a QR code image for the DPP method. Note that the order of execution of S304 and S305 may be reversed. Alternatively, the QR code image may be generated after the determination process in S307, which will be described later.

In step S<b>306 , the printer 101 controls the display unit 204 to display a selection screen for accepting from the user which method, the legacy method or the DPP method, is to be used for connection. FIG. 4A is a diagram showing an example of a setting method selection screen displayed on the display unit 204. As shown in FIG.

In S307, the printer 101 determines which of the legacy method and the DPP method was selected on the selection screen. If it is determined that the DPP method has been selected (YES in S307), the process proceeds to S308, and if it is determined that the legacy method has been selected (NO in S307), the process proceeds to S309.

In S<b>308 , the printer 101 controls the display unit 204 to display the DPP QR code image generated in S<b>305 on the display unit 204 . On the other hand, in S<b>309 , the printer 101 controls the display unit 204 to display the legacy QR code image generated in S<b>304 on the display unit 204 .

Through the above processing, only one QR code image is displayed on the display unit 204 of the printer 101 . Therefore, the user of the mobile device 102 can set communication parameters in the mobile device 102 by photographing one displayed QR code image with the mobile device 102 .

Note that when generating a QR code image after the determination processing in S307, only the QR code image for the determined method may be generated. As a result, it is possible to reduce the number of QR code images to be generated, and thus it is possible to reduce the load of the generation processing related to the QR code images.

FIG. 5 is a sequence diagram showing setting processing in the legacy method. That is, it shows processing in which the user selects the legacy method, the printer 101 displays a QR code image for the legacy method, and the portable device 102 acquires communication parameters based on the legacy method and connects to the wireless network 103 .

When the printer 101 confirms that the user has pressed a button for starting connection processing to the wireless network (S501), it sets an IP address for itself (S502) and forms the wireless network 103 (S502). S503).

After forming the wireless network 103, the printer 101 generates a QR code image for the legacy system and a QR code image for the DPP system (S504, S505). After that, the printer 101 displays a selection screen (FIG. 4A) for allowing the user to select which method, the legacy method or the DPP method, is to be used for connection (S506).

After displaying the selection screen, the printer 101 waits for the method selection from the user, determines that the legacy method has been selected by the user (S507), and displays the QR code image for the legacy method (S508).

On the other hand, when the portable device 102 receives an instruction to connect to the wireless network 103 from the user, it activates an imaging unit such as a camera for imaging the QR code image (S509). For example, when the user instructs to start the setting application, the setting application starts the camera, controls the camera according to the user's operation, and starts imaging.

The user directs the shooting direction of the camera of the mobile device 102 to the QR code image displayed by the printer 101 in S508. When the QR code image is captured, the mobile device 102 decodes the QR code image (S510). Information indicated by the QR code image decoded in S510 includes communication parameters for connecting to the wireless network 103 .

The mobile device 102 connects to the wireless network 103 by setting the communication parameters decoded and acquired in S510 in the mobile device 102 itself (S511).

FIG. 6 is a sequence diagram showing setting processing in the DPP method. That is, it shows processing in which the user selects the DPP method, the printer 101 displays a QR code image for the DPP method, and the mobile device 102 acquires communication parameters based on the DPP method and connects to the wireless network 103 .

When the printer 101 confirms that the button for starting connection processing to the wireless network has been pressed by the user (S601), it sets an IP address for itself (S602) and forms the wireless network 103 (S602). S603).

After forming the wireless network 103, the printer 101 generates a QR code image for the legacy system and a QR code image for the DPP system (S604, S605). After that, the printer 101 displays a selection screen (FIG. 4A) for allowing the user to select which method, the legacy method or the DPP method, is to be used for connection (S606).

After displaying the selection screen, the printer 101 waits for the method selection from the user, determines that the DPP method has been selected by the user (S607), and displays the QR code image for the DPP method (S608).

On the other hand, when the mobile device 102 receives an instruction to connect to the wireless network 103 from the user, it activates an imaging unit such as a camera for capturing a QR code image (S609). For example, when the user instructs to activate the setting application, the setting application activates the camera, controls the camera according to the user's operation, and starts imaging.

The user directs the imaging direction of the camera of the mobile device 102 to the QR code image displayed by the printer 101 in S608. When the QR code image is captured, the mobile device 102 decodes the QR code image (S610). The information indicated by the QR code image decoded in S510 does not include communication parameters for connecting to the wireless network 103, but includes the public key of the printer 101 used in the DPP method. The public key can be used for authentication of the printer 101 and encryption of the communication channel when providing communication parameters.

After acquiring the public key of the printer 101, the mobile device 102 transmits to the printer 101 an authentication request including the hash value of the public key of the printer 101 and the public key of the mobile device 102 itself (S611).

The printer 101 that has received the authentication request determines whether or not the device that has sent the authentication request is the device that captured the QR code image. Here, the hash value of the public key included in the QR code image generated in S605 is calculated. Then, the calculated hash value and the hash value included in the authentication request received in S611 are compared. If the two match, the mobile device 102 that has transmitted the authentication request is authenticated as the device that captured the QR code image. After that, the printer 101 transmits an authentication response indicating that the mobile device 102 has been authenticated as the device that captured the QR code image (S612).

The mobile device 102 that has received the authentication response in S612 confirms that it has been authenticated by the printer 101, and transmits authentication confirmation to the printer 101 (S613).

Upon receiving the authentication confirmation, the printer 101 generates a shared key using both the public key of the mobile device 102 received in step S611 and the private key of the printer 101 itself. On the other hand, the mobile device 102 that has transmitted the authentication confirmation generates a shared key using both the public key of the printer 101 acquired in S610 and the private key of the mobile device 102 itself. Here, the shared key is assumed to be generated based on, for example, ECDH (Elliptic Curve Diffie-Hellman), but may be generated based on other public key cryptosystems.

The printer 101 transmits the communication parameters encrypted using the generated shared key to the mobile device 102 (S614). That is, the communication parameters are transmitted through the communication path encrypted using the generated shared key. Meanwhile, the mobile device 102 decrypts the encrypted communication parameters using the generated shared key. That is, the communication parameters are received via the communication path encrypted using the generated shared key.

The mobile device 102 connects to the wireless network 103 by setting the communication parameters decoded and acquired in S614 in the mobile device 102 itself (S615).

As described above, according to the first embodiment, the printer 101 selectively displays the QR code corresponding to the setting method specified by the user. Accordingly, the user of the mobile device 102 can set the communication parameters in the mobile device 102 by capturing one displayed QR code image with the mobile device 102 without confusion.

<Another example of the selection screen>
In S306 described above, a selection screen (FIG. 4A) is displayed for the user to directly specify (select) either the "legacy method" or the "DPP method". However, as the reception content of the setting method, it may be configured to receive information that is easier for the user to understand. For example, the QR code image to be displayed may be narrowed down to one according to the functions of the mobile device 102 . In the following description, as an example of functions provided in the mobile device 102, a case will be described in which a QR code image to be displayed is selected according to the version of the OS (Operating System) of the mobile device 102. FIG.

Android (registered trademark), for example, can be considered as the OS of the mobile device 102 . If the version of the OS is old, the mobile device 102 may not be compatible with the setting method of the DPP method, which is newer than the legacy method. In this case, even if the mobile device 102 captures a DPP QR code image, it cannot be connected to the wireless network 103 . Therefore, a form in which the QR code image to be displayed is narrowed down to one based on the version of the OS installed in the mobile device 102 will be described.

FIG. 7 is a flowchart of another QR code image display process. Specifically, it is a flowchart showing processing for narrowing down the QR code image to be displayed to one based on the version of the OS installed in the mobile device 102 . Since the processing of S701 to S705 is the same as that of FIG. 3 (S301 to S305), description thereof is omitted.

In step S<b>706 , the printer 101 controls the display unit 204 to display a selection screen for allowing the user to select the OS version installed in the mobile device 102 . FIG. 8 is a diagram showing an example of an OS version selection screen displayed on the display unit 204. As shown in FIG. "X.X" of "Android X.X" is a version number, and numbers such as "4.3" and "6.2" are preset. In FIG. 8, the screen is configured to receive whether or not the version is later than the version set in advance, but other screen configurations may be used. For example, the printer 101 may be configured to receive the OS version via a numeric keypad or the like, and determine whether the received OS version is later than a preset version.

In step S<b>707 , the printer 101 determines which of “Android X.X or later” or “Android X.X or later” was selected on the selection screen. If it is determined that "Android X.X or later" is selected (YES in 707), the process proceeds to S708, and if it is determined that "Less than Android X.X" is selected (NO in 707), the process proceeds to S709.

In step S<b>708 , the printer 101 controls the display unit 204 to display the DPP QR code image generated in step S<b>705 on the display unit 204 . On the other hand, in step S<b>709 , the printer 101 controls the display unit 204 to display the legacy QR code image generated in step S<b>704 on the display unit 204 .

As in the case of the processing in FIG. 3, the QR code image may be generated after the determination processing in S707 without generating the QR code image in S704 and S705. In addition, although Android is used as the OS installed in the portable device 102, it is not limited to this. For example, iOS of Apple (registered trademark) may be used.

Also, the version of the setting application may be used instead of the version of the OS, or the version of the OS and the version of the setting application may be combined. Any function information that can specify the setting method can be displayed as a selection screen (FIG. 8).

(Second embodiment)
In the second embodiment, the case where the printer 101 has already formed the wireless network 103 when the mobile device 102 starts setting communication parameters will be described. For example, the portable device 102 connected to the printer 101 according to FIG. 5 or 6 is once disconnected and then reconnected, or another portable device is newly connected.

Since the system configuration and device configuration are the same as those of the first embodiment (FIGS. 1 and 2), the description is omitted. However, in addition to determining the setting method described in the first embodiment, the method determination unit 208 further has a function of determining which setting method the QR code image displayed when the wireless network 103 was formed was for.

<Device operation>
FIG. 9 is a flowchart of QR code image display processing in the second embodiment. The processing of S901, S903 to S910 is the same as that of FIG. 3 (S301, S302 to S309), so the description is omitted.

In S902, the printer 101 determines whether the wireless network 103 has already been formed. If it is determined that the wireless network 103 has not been formed (NO in S902), the process proceeds to S903, and if it is determined that the wireless network 103 has been formed (YES in S902), the process proceeds to S911.

In step S<b>911 , the printer 101 determines whether the QR code image for the legacy method or the DPP method was displayed when the wireless network 103 was formed. If it is determined that the QR code image for the DPP system has been displayed (YES in S911), the process proceeds to S912, and if it is determined that the QR code image for the legacy system has been displayed (NO in S911), the process proceeds to S913.

In S<b>912 , the printer 101 controls the display unit 204 to display the QR code image for the DPP method on the display unit 204 . On the other hand, in S<b>913 , the printer 101 controls the display unit 204 to display the QR code image for the legacy method on the display unit 204 .

The QR code image displayed in S912 and S913 can be the same as the QR code image generated in S905 and S906 when the wireless network 103 was formed. However, it may be configured such that it is newly generated after the determination in S911. For example, by generating the QR code image after the determination in S911, it is not necessary to keep holding the QR code image after the wireless network is formed, and the storage capacity can be reduced.

As described above, according to the second embodiment, when the wireless network 103 has already been formed, the printer 101 displays the QR code image for the setting method used when the wireless network 103 was formed. Accordingly, the user of the mobile device 102 can set the communication parameters in the mobile device 102 by capturing one displayed QR code image with the mobile device 102 without confusion.

Here, it is assumed that the printer 101 continues to maintain the network 103 formed according to FIG. 5 or 6 until the power of the printer 101 is turned off. However, the formation of the network 103 may be terminated when communication with the mobile device 102 is not performed for a certain period of time. It should be noted that if the setting start instruction is issued after the formation of the network 103 is completed, and it is determined that the wireless network 103 has not been formed (NO in S902), the process proceeds to S903.

(Modification)
In each of the above-described embodiments, a bar code or a two-dimensional code may be used instead of the QR code image. Also, instead of displaying a coded image suitable for reading by a computer, it may be displayed in a display format (such as ASCII characters) that is easy for the user to understand. Means for reading such information is not limited to a camera for photographing a QR code, but may be a reader device having a function of reading various codes.

Also, as a wireless communication standard, a case has been described in which wireless LAN communication conforming to the IEEE802.11 series is used, but the present invention is not limited to this. For example, it may be implemented using wireless communication media such as wireless USB, MBOA, Bluetooth (registered trademark), UWB, ZigBee, and NFC. Here, MBOA is an abbreviation for Multi Band OFDM Alliance. UWB includes wireless USB, wireless 1394, WINET, and the like.

Also, the case of providing communication parameters for connecting to a wireless LAN access point has been described, but the present invention is not limited to this. For example, it may provide communication parameters for connecting to a Wi-Fi Direct P2P Group Owner.

Further, in each of the above-described embodiments, a form in which only one wireless network of the printer 101 is formed has been described, but a plurality of wireless networks may be formed. For example, two wireless networks can be formed: a wireless network that can be connected by obtaining DPP QR code image information and a wireless network that can be connected by obtaining legacy QR code image information. good.

Also, in the selection screen displayed in S306/S706/S907, an option to display both of the two types of QR code images may be provided. FIG. 4(b) is an example of a selection screen displayed on the display unit 204, in which a "skip" button is newly added to the screen shown in FIG. 4(a). Two QR code images are displayed on the display unit 204 when the user selects the “skip” button. Alternatively, the two QR code images may be automatically displayed on the display unit 204 when the selection screen in FIG.

(Other examples)
The present invention supplies a program that implements one or more functions of the above-described embodiments to a system or device via a network or a storage medium, and one or more processors in the computer of the system or device reads and executes the program. It can also be realized by processing to It can also be implemented by a circuit (for example, ASIC) that implements one or more functions.

101 printer; 102 mobile device; 103 wireless network; 201 wireless communication controller; Processing unit; 210 IP address processing unit

Claims (16)

A communication device,
First display control means used in a first communication parameter setting method for setting communication parameters for connecting to a network , and displaying a first image encoded with information including communication parameters based on a user's operation. and,
Information that is used in a second communication parameter setting method conforming to the DPP (Device Provisioning Protocol) standard for setting communication parameters for connecting to the network , and that does not include communication parameters but includes the public key of the communication device. a second display control means for displaying a second image encoded by the user based on a user operation ;
execution means for receiving information about the obtained public key from an external device that has obtained a public key by reading the second image when displaying the second image, and executing authentication processing;
providing means for providing communication parameters for connecting to the network to the external device when the authentication process is successful;
A communication device comprising: receiving means for receiving an authentication request transmitted using the public key from an external device that has read the second image when the second display control means displays the second image;
sending means for sending an authentication response to the external device in response to the authentication request;
further having
The providing means provides the communication parameters after the transmitting means has transmitted the authentication response .
The communication device according to claim 1, characterized by: 3. The communication device according to claim 2, wherein the authentication request includes a hash value of the public key. further comprising determining means for determining whether or not the hash value of the public key derived by the communication device itself matches the hash value of the public key included in the authentication request;
4. The communication apparatus according to claim 3, wherein said transmitting means transmits said authentication response based on a result of determination by said determining means. 5. The communication device according to claim 2, wherein said receiving means receives authentication confirmation from said external device after said transmitting means has sent said authentication response. further comprising generating means for generating a shared key based on the public key of the external device and the private key of the communication device;
6. The communication apparatus according to any one of claims 2 to 5, wherein said providing means provides said communication parameters based on said shared key. 7. The communication device according to claim 6, wherein the shared key is generated based on ECDH (Elliptic Curve Diffie-Hellman). The communication device according to any one of claims 1 to 7, wherein the first image and the second image are QR code images. 9. The apparatus according to any one of claims 1 to 8, further comprising display control means for displaying a screen for accepting a user operation for selecting which image to display, the first image or the second image. 1. The communication device according to claim 1. 10. The communication device according to any one of claims 1 to 9, wherein said network is a network formed by said communication device. 11. The communication apparatus according to any one of claims 1 to 10 , wherein the first communication parameter setting method is a setting method different from the DPP standard . The communication device according to any one of claims 1 to 11 , wherein the first communication parameter setting method is a setting method using Wi-Fi Direct (registered trademark) . 13. The apparatus according to any one of claims 1 to 12, further comprising determining means for determining whether or not to accept a user operation for selecting a communication parameter setting method according to whether or not said communication device forms a network. 1. The communication device according to claim 1. 14. The apparatus according to any one of claims 1 to 13, wherein when displaying the first image, an external device that has acquired communication parameters from the first image executes communication connection using the acquired communication parameters. The communication device according to item 1. A program for causing a computer to function as the communication device according to any one of claims 1 to 14 . A control method for a communication device,
A first display control step of displaying a first image, which is used in a first communication parameter setting method for setting communication parameters for connecting to a network and is encoded with information including the communication parameters , based on a user's operation. and,
Information that is used in a second communication parameter setting method conforming to the DPP (Device Provisioning Protocol) standard for setting communication parameters for connecting to the network , and that does not include communication parameters but includes the public key of the communication device. A second display control step of displaying a second image encoded by the user based on a user operation ;
an executing step of, when displaying the second image, receiving information about the obtained public key from an external device that has obtained the public key by reading the second image, and executing an authentication process;
a providing step of providing communication parameters for connecting to the network to the external device when the authentication process is successful;
A control method comprising:

Images