JP6218225B2 - Data communication system, communication terminal device, and communication program - Google Patents

Description

  The present invention relates to a data communication system, a communication terminal device, and a communication program that perform data communication via a network.

  In recent years, network communication using a public line such as the Internet has been widely performed. However, there is a problem that communication via a public line is weak in security. Therefore, a dedicated line is used to improve security (see, for example, Patent Document 1).

JP 2001-175551 (paragraphs 0012 and 0013)

  However, the fee for using a dedicated line is very expensive. For example, when two bases are connected by a dedicated line between Tokyo and Osaka, a usage fee of about 1 million yen per month is generally required. When the number of bases is further increased, an additional usage fee of about 500,000 yen is required for each additional base.

  An object of the present invention is to provide a data communication system, a communication terminal device, and a communication program that can easily reduce communication costs while ensuring communication security.

  A data communication system according to the present invention includes a server device that stores and reads data from and to a server-side storage unit that stores data, and a communication terminal device that is connected to the server device via a network so that data can be transmitted and received. The communication terminal device includes: a display unit for displaying an image; an operation unit for receiving a user operation; a data storage unit for storing data; and an encryption key storage unit for storing an encryption key used for encryption A server window display processing unit for displaying a server window, which is a window for displaying an icon corresponding to the data stored in the server-side storage unit, by the display unit, and encrypting the data using the encryption key. And an icon displayed outside the server window by the operation unit. Based on the reception of the first operation, which is an operation dragged and dropped on the dough, the data corresponding to the dragged and dropped icon is encrypted by the encryption processing unit, and the encrypted data is A transmission processing unit that executes transmission processing to be transmitted to the server device and stored in the server-side storage unit.

  The communication terminal device according to the present invention is a communication terminal device connected to a server side storage unit for storing data so as to be able to transmit and receive data via a network with a server device that stores and reads the data. A display unit for displaying an image, an operation unit for receiving a user operation, a data storage unit for storing data, an encryption key storage unit for storing an encryption key used for encryption, and storage in the server-side storage unit A server window, which is a window for displaying an icon corresponding to the received data, is displayed by the display unit, a server window display processing unit, an encryption processing unit for encrypting data using the encryption key, and An operation in which an icon displayed outside the server window is dragged and dropped on the server window by the operation unit. And the data corresponding to the drag-and-dropped icon is encrypted by the encryption processing unit, and the encrypted data is transmitted to the server device. A transmission processing unit that executes transmission processing to be stored in the server-side storage unit.

  In addition, the communication program according to the present invention is connected to a server side storage unit for storing data and a server device that stores and reads the data via a network so that data can be transmitted and received, and a display that displays an image Stored in the server-side storage unit, a data storage unit that stores data, an encryption key storage unit that stores an encryption key used for encryption, and a server-side storage unit A server window that is a window for displaying an icon corresponding to data, a server window display processing unit that is displayed by the display unit, an encryption processing unit that encrypts data using the encryption key, and the operation unit The icon displayed outside the server window is dragged and dropped into the server window The data corresponding to the dragged-and-dropped icon is encrypted by the encryption processing unit, and the encrypted data is transmitted to the server device. And function as a transmission processing unit that executes transmission processing stored in the server-side storage unit.

  According to these configurations, the user can encrypt and transmit data from the communication terminal device to the server device via the network based on a simple operation of dragging and dropping an icon from the outside of the server window to the server window. it can. In this case, the user does not need to be aware of encryption, and even if an inexpensive public line is used as a network, the server device and the communication terminal device are substantially connected by a dedicated line while ensuring security. The same operability as when connected is obtained. In this case, the user does not need to be aware of encryption, and can obtain the same operability as when the server device and the communication terminal device are connected by a dedicated line while ensuring security. As a result, it is easy to reduce the communication cost using the public line while ensuring the communication security.

  The transmission processing unit causes the display unit to display an encryption selection menu for selecting whether or not to perform encryption when the first operation is received by the operation unit in the transmission process. When the operation unit accepts a selection to perform the encryption based on the encryption selection menu, the data corresponding to the icon dragged and dropped in the first operation is encrypted by the encryption processing unit Preferably, the encrypted data is transmitted to the server device and stored in the server-side storage unit.

  According to this configuration, since the user confirms the encryption selection menu after performing the first operation and selects to perform encryption, the data is encrypted and transmitted to the server device. The risk of erroneous data encryption due to user error is reduced.

  In the transmission process, when the operation unit accepts a selection indicating that the encryption is not performed based on the encryption selection menu, the transmission processing unit is dragged and dropped in the first operation. It is preferable that the data corresponding to is transmitted to the server device without being encrypted and stored in the server-side storage unit.

  According to this configuration, data that does not need to be kept secret can be stored in the server-side storage unit without being encrypted by selecting that the user does not perform encryption. Convenience is improved.

  In addition, it is preferable that the encryption key storage unit stores a decryption key used for decryption, and the communication terminal device further includes a decryption processing unit that decrypts data using the decryption key.

  According to this configuration, the encrypted data can be decrypted in the communication terminal device.

  In addition, the communication terminal device may be configured to drag and drop the second operation, which is an operation of dragging and dropping the icon displayed on the server window by the operation unit to the outside of the server window. Receiving process for causing the server device to read and transmit the data corresponding to the icon from the server-side storage unit, decoding the transmitted data by the decoding processing unit, and storing the data in the data storage unit It is preferable to further include a reception processing unit that executes.

  According to this configuration, the user can transmit encrypted data from the server device to the communication terminal device via the network with a simple operation by simply dragging and dropping the icon from the server window to the outside of the server window. It can be decrypted and stored in the data storage unit.

  In addition, when the second operation is received by the operation unit, the reception processing unit causes the display unit to display a decoding selection menu for selecting whether or not to perform decoding, and the decoding selection When the selection to perform the decryption based on the menu is accepted by the operation unit, the server device reads data corresponding to the icon dragged and dropped in the second operation from the server-side storage unit. Preferably, the transmitted data is decrypted by the decryption processing unit and stored in the data storage unit.

  According to this configuration, when the user confirms the decryption selection menu after performing the second operation and selects to perform decryption, the data is transmitted from the server device and decrypted to store the data. Therefore, the possibility that the data is erroneously decoded due to an erroneous operation by the user is reduced.

  In addition, when the operation unit accepts a selection indicating that the decoding is not performed based on the decoding selection menu in the reception process, the reception processing unit is dragged and dropped in the second operation. It is preferable that data corresponding to is read out from the server-side storage unit by the server device and transmitted, and the transmitted data is stored in the data storage unit without being decrypted.

  According to this configuration, the user can store the data that he / she wants to encrypt on the local communication terminal device in the data storage unit without being decrypted, and thus can be stored in the data storage unit. improves.

  Further, the data includes attribute information indicating processing to be performed on the data, and the communication terminal device sets data corresponding to the icon to the icon displayed on the server window. When a third operation, which is an operation for instructing execution of the processing used, is received by the operation unit, the server device reads data corresponding to the icon from the server-side storage unit and transmits the data. An execution processing unit that causes the transmitted data to be decrypted by the decryption processing unit, and executes processing corresponding to the attribute information included in the decrypted data with respect to the decrypted data. It is preferable to further provide.

  According to this configuration, the user can perform an execution process using the data by performing the third operation on the data file icon stored in an encrypted state in the server-side storage unit. So convenience is improved. Also, since the data is transmitted from the server device to the communication terminal device in an encrypted state and decrypted by the communication terminal device, execution processing using the data stored in the server device while maintaining security It can be performed.

  The communication terminal device includes a plurality of communication terminal devices, the plurality of communication terminal devices are grouped into a plurality of groups, and each communication terminal device further includes an access processing unit that requests authentication of the own terminal, The key storage unit stores the encryption key in association with one or a plurality of groups to which the terminal belongs, and stores the decryption key in association with the group or groups to which the terminal belongs. The encryption keys corresponding to the same group stored in each encryption key storage unit of the terminal device are the same encryption keys, the decryption keys corresponding to the same group are the same decryption keys, and the server The apparatus includes a plurality of server-side storage units corresponding to the plurality of groups, and stores information indicating groups to which the communication terminal apparatuses belong. An authentication processing unit that authenticates the communication terminal device corresponding to the access processing unit that requested the authentication, and the authentication processing unit, when the authentication is requested by the access processing unit. When the authentication is successful, group data information indicating data stored in the server-side storage unit respectively corresponding to one or a plurality of the groups to which the communication terminal device belongs is transmitted to the communication terminal device that has succeeded in the authentication. A group information transmission unit, wherein the server window display processing unit causes the display unit to display one or a plurality of server windows respectively corresponding to the one or a plurality of groups to which the terminal belongs, and the transmission processing unit The first operation is performed by the operation unit corresponding to any one of the one or the plurality of server windows. When it is pasted, an encryption key corresponding to the group corresponding to the drag-and-drop destination server window in the first operation is acquired from the encryption key storage unit, and the drag-and-drop operation is performed based on the acquired encryption key. The server-side storage corresponding to the group corresponding to the drag-and-drop destination server window by encrypting the data corresponding to the selected icon by the encryption processing unit and transmitting the encrypted data to the server device It is preferable to store it in the part.

  According to this configuration, the plurality of communication terminal devices are grouped, and an encryption key is provided for each group. Therefore, data encrypted with an encryption key of a certain group cannot be decrypted by a communication terminal device that does not belong to that group. Accordingly, communication terminal apparatuses in different groups are substantially the same as those in which no line is connected. Therefore, even when a plurality of communication terminal devices are connected to the public line, only the communication terminal devices grouped in the same group among the plurality of communication terminal devices are connected via the dedicated line via the server device. It is possible to construct a network that is substantially the same as that described above.

  In addition, when a plurality of the server windows are displayed by the display unit, an icon displayed on any one of the plurality of server windows by the operation unit is a server different from any one of the server windows. When a fourth operation, which is an operation dragged and dropped on a window, is received, the reception processing unit causes the server device to read data corresponding to the dragged and dropped icon from the server-side storage unit. The decryption key corresponding to the group corresponding to the drag-and-drop source server window is acquired from the decryption key storage unit, and the transmitted data is processed based on the acquired decryption key. And the transmission processing unit The encryption key corresponding to the group corresponding to c is acquired from the encryption key storage unit, and the decrypted data is encrypted by the encryption processing unit based on the acquired encryption key, and the encrypted key is encrypted. Preferably, the data is transmitted to the server device and stored in the server-side storage unit corresponding to the group corresponding to the other server window.

  According to this configuration, the user can easily transfer data between two communication terminal devices in different groups by simply dragging and dropping an icon from one of the server windows to the other server window. Can be made transferable. In this case, by using the communication terminal devices belonging to the two groups, the user does not need to be aware of encryption, and can transfer data between the two groups while ensuring security.

  The server device includes a first server device and a second server device, and the server window display processing unit displays the server window corresponding to the first server device and the second server device, respectively, in the display unit. Is preferably displayed.

  According to this configuration, the user can easily move the icon from the first server device to the second server device by simply dragging and dropping the icon between the two server windows respectively corresponding to the first and second server devices. Data can be transferred while ensuring security.

  Each of the communication terminal devices displays a message window in which a user can write a message on the display unit corresponding to the server window displayed by the server window display processing unit, and writes the message window in the message window. The encrypted message is encrypted by the encryption processing unit using the encryption key corresponding to the target group which is a group corresponding to the server window corresponding to the message window, and the encrypted message is encrypted. As a message processing unit to be transmitted to the server device, and the server device further includes a message transfer unit for transmitting the encrypted message to another communication terminal belonging to the target group. From the server device When the encrypted message is received, the decryption processing unit decrypts the decrypted message using the decryption key corresponding to the target group, and displays the decrypted message in the message window corresponding to the target group. It is preferable.

  According to this configuration, the user can send a message with a simple operation to another user belonging to the same group as the message window in which the message is written.

  The server device includes a first server device and a second server device, and the server window display processing unit displays the server window corresponding to the first server device and the second server device, respectively, in the display unit. When the operation of dragging and dropping the icon displayed in the server window corresponding to the first server device to the server window corresponding to the second server device is received by the operation unit, The reception processing unit causes the data corresponding to the dragged and dropped icon to be transmitted from the first server device, the transmitted data is decrypted by the decryption processing unit based on the decryption key, and the transmission processing The decryption data is decrypted by the encryption processing unit based on the encryption key. Was encrypted can, it may also be stored in the server-side storage unit of the encrypted data transmitted to the second server device the second server device.

  According to this configuration, the user can easily move the icon from the first server device to the second server device by simply dragging and dropping the icon between the two server windows respectively corresponding to the first and second server devices. Data can be transferred while ensuring security.

  The server-side storage unit includes a plurality of storage server devices for storing data. When the server device stores the data in the server-side storage unit, the server-side storage unit stores the data. When the data is distributed and stored in the storage server device and the data is read from the server-side storage unit, it is preferable that the data is generated by collecting the distributed data from the plurality of storage server devices.

  According to this configuration, the encrypted data is divided and distributed and stored in the plurality of storage server devices, so that the security strength is improved.

  The plurality of storage server devices are preferably connected to the server device via a communication path different from the network so as to be able to store and read the data.

  According to this configuration, the plurality of storage server devices are connected to the server device via a communication path different from the network connected to the communication terminal device, and data can be stored and read via the communication path. Has been made possible. As a result, since the storage server device cannot be accessed from the outside via the network, the security strength of the divided data stored in the plurality of storage server devices is improved.

  In addition, the communication terminal device displays a local window, which is a window for displaying an icon corresponding to data stored in the data storage unit, as an outside of the server window by the display unit. It is preferable to further comprise.

  According to this configuration, the user can clearly recognize that data corresponding to the icon displayed in the local window is stored in the data storage unit of the communication terminal device.

  Moreover, it is preferable that the said display part and the said operation part are comprised by the touchscreen display.

  According to this configuration, the present invention can be applied to a communication terminal device that includes a touch panel display.

  And a window switching unit that causes the server window display processing unit to display the server window when the icon displayed on the local window reaches the edge of the local window in the process of being moved by dragging. Is preferred.

  According to this configuration, since the local window and the server window can be switched and displayed on the touch panel display, it is easy to use a touch panel display with a small display area.

  The data communication system, communication terminal device, and communication program having such a configuration can easily reduce communication costs while ensuring communication security.

It is a block diagram which shows an example of a structure of the data communication system provided with the communication terminal device which concerns on one Embodiment of this invention. It is a block diagram which shows an example of a structure of the communication terminal device which concerns on 1st Embodiment of this invention. It is explanatory drawing for demonstrating the authentication key memorize | stored in the encryption key memory | storage part and authentication key memory | storage part of a communication terminal device, and an encryption key. It is a block diagram which shows an example of a structure of the server apparatus which concerns on 1st Embodiment of this invention. It is explanatory drawing for demonstrating the information memorize | stored previously in a terminal information storage part. It is a flowchart which shows an example of operation | movement of the data communication system and communication program which concern on one Embodiment of this invention. It is a flowchart which shows an example of operation | movement of the data communication system and communication program which concern on one Embodiment of this invention. It is a flowchart which shows an example of operation | movement of the data communication system and communication program which concern on one Embodiment of this invention. It is a flowchart which shows an example of operation | movement of the data communication system and communication program which concern on one Embodiment of this invention. It is a screen figure which shows an example of the display screen displayed on a display part. It is explanatory drawing for demonstrating the effect of grouping. It is explanatory drawing for demonstrating operation | movement in case a data communication system contains the some server apparatus 2. FIG. It is a block diagram which shows an example of a structure of the communication terminal device which concerns on 2nd Embodiment of this invention. It is explanatory drawing which shows an example of the display screen displayed on a touchscreen display. It is explanatory drawing for demonstrating operation | movement in the case of displaying an encryption selection menu and a decryption selection menu. It is a block diagram which shows an example of a structure of the communication terminal device which concerns on 3rd Embodiment of this invention. It is a block diagram which shows an example of a structure of the server apparatus which concerns on 3rd Embodiment of this invention. It is a flowchart which mainly shows an example of operation | movement of an execution process part about the data communication system and communication program which concern on 3rd Embodiment of this invention. It is a flowchart which mainly shows an example of operation | movement of an execution process part about the data communication system and communication program which concern on 3rd Embodiment of this invention. It is a screen figure for demonstrating operation | movement of a message processing part. It is a block diagram which shows an example of a structure of the server apparatus which concerns on 4th Embodiment of this invention.

Embodiments according to the present invention will be described below with reference to the drawings. In addition, the structure which attached | subjected the same code | symbol in each figure shows that it is the same structure, The description is abbreviate | omitted.
(First embodiment)

  FIG. 1 is a block diagram illustrating an example of a configuration of a data communication system including a communication terminal device according to an embodiment of the present invention. A data communication system 100 shown in FIG. 1 is configured by connecting a server device 2 and communication terminal devices 1a, 1b, and 1c via a network 3 so that data can be transmitted and received. The network 3 is a public line such as the Internet, for example. The communication terminal devices 1a, 1b, and 1c have the same configuration. Hereinafter, the communication terminal devices 1a, 1b, and 1c are collectively referred to as the communication terminal device 1.

  Note that the number of communication terminal devices is not limited to three, and may be one, two, or four or more. The server device 2 does not need to be physically one server device. For example, the server device 2 may be a so-called cloud server that functions as a single server device by dynamically allocating processing. Good.

  FIG. 2 is a block diagram showing an example of the configuration of the communication terminal device 1 according to the first embodiment of the present invention. The communication terminal device 1 shown in FIG. 2 is a so-called computer, and includes a control unit 10, a display 11 (display unit), a keyboard 12, a mouse 13 (operation unit), a communication I / F circuit 14, and an HDD (Hard Disk Drive). A device 15 is provided. The communication I / F circuit 14 is a communication interface circuit for communicating with the server device 2 and other communication terminal devices 1 other than the own terminal via the network 3. The HDD device 15 includes storage areas of a data storage unit 151, an encryption key storage unit 152, and an authentication key storage unit 153. Instead of the HDD device 15, a non-volatile storage element such as a flash memory or other various storage devices can be used.

  The control unit 10 includes, for example, a CPU (Central Processing Unit) that executes predetermined arithmetic processing, a RAM (Random Access Memory) that temporarily stores data, a peripheral circuit, and the like. Then, the control unit 10 executes a communication program stored in the HDD device 15, for example, thereby generating a key generation unit 101, an access processing unit 102, a local window display processing unit 103, a server window display processing unit 104, an encryption process Unit 106, decoding processing unit 107, transmission processing unit 108, and reception processing unit 109.

  The communication terminal devices 1a, 1b, and 1c are grouped into a plurality of groups, for example, three groups A, B, and C. Hereinafter, an example in which the communication terminal devices 1a and 1b belong to the group A, the communication terminal devices 1b and 1c belong to the group B, and the communication terminal devices 1a, 1b, and 1c belong to the group C will be described.

  The data storage unit 151 stores data files (data) to be processed by the user. The encryption key storage unit 152 stores an encryption key used for encryption and decryption. The authentication key storage unit 153 stores an authentication key used for authenticating the terminal itself. In the present embodiment, the encryption key is used for both encryption and decryption, and the encryption key also functions as a decryption key. That is, an example is shown in which the same encryption key is used for encryption and decryption. Therefore, the encryption key according to the present embodiment is both an encryption key and a decryption key, and the encryption key is an example of an encryption key and a decryption key. Accordingly, the encryption key storage unit 152 stores the encryption key and the decryption key by storing the encryption key that is both the encryption key and the decryption key. The encryption key used for encryption and the decryption key used for decryption are stored in the encryption key storage unit 152 by using an encryption method in which the encryption key used for encryption and the decryption key used for decryption are different. It is good also as a structure memorize | stored.

  The key generation unit 101 generates an encryption key used for encryption and decryption and stores the encryption key in the encryption key storage unit 152. The key generation unit 101 also identifies the communication terminal devices 1a, 1b, and 1c, and stores an authentication key for authenticating the server device 2 in the authentication key storage unit 153.

  FIG. 3 is an explanatory diagram for explaining the encryption keys and the authentication keys stored in the encryption key storage unit 152 and the authentication key storage unit 153 of the communication terminal devices 1a, 1b, and 1c. The key generation unit 101 automatically generates an authentication key and an encryption key using unique information unique to the communication terminal devices 1a, 1b, and 1c. As the unique information for the communication terminal devices 1a, 1b, and 1c, various data such as a CPU processor serial number and a circuit board manufacturing number can be used.

  The key generation unit 101 automatically generates an authentication key and an encryption key by performing various arithmetic processes such as four arithmetic operations, logical operations, and combinations thereof on the unique information of the terminal itself. Thereby, each authentication key of communication terminal device 1a, 1b, 1c becomes mutually different data. The key generation unit 101 of the communication terminal devices 1a, 1b, and 1c stores the authentication keys thus obtained in the authentication key storage unit 153 of its own terminal, and encrypts the authentication keys using, for example, a public encryption method. To the server device 2.

  The encryption key and authentication key generated in this way are stored in advance in each encryption key storage unit 152 and authentication key storage unit 153 of the communication terminal devices 1a, 1b, and 1c.

  The key generation unit 101 is not limited to the example in which the authentication key is not necessarily encrypted and transmitted to the server device 2. For example, the user records the authentication key generated by the key generation unit 101 of the communication terminal device 1a, 1b, 1c on a recording medium such as a USB (Universal Serial Bus) memory or a writable recording disk, and the recording medium The authentication key of the communication terminal devices 1a, 1b, and 1c may be stored in the terminal information storage unit 211 of the server device 2 by using the server device 2 to read the authentication key.

  On the other hand, the key generation unit 101 generates an encryption key corresponding to each group to which the terminal belongs. Then, the key generation unit 101 associates the information indicating the group to which the terminal belongs with the encryption key of each group and stores the information in the encryption key storage unit 152. That is, the encryption key storage unit 152 stores information indicating the group to which the terminal belongs together with the encryption key.

  For example, the key generation unit 101 of the communication terminal device 1a belonging to the groups A and C generates encryption keys for the groups A and C. The key generation unit 101 of the communication terminal device 1b belonging to the groups A, B, and C generates encryption keys for the groups A, B, and C. The key generation unit 101 of the communication terminal device 1c belonging to the groups B and C generates encryption keys for the groups B and C.

  The encryption key of the same group must be the same encryption key in the communication terminal devices 1a, 1b, and 1c. Therefore, the key generation unit 101 encrypts the generated encryption key using, for example, a public encryption method, and transmits the encryption key from the communication I / F circuit 14 to another communication terminal device 1 via the network 3. The key generation unit 101 of the communication terminal device 1 that has received the encryption key from the other communication terminal device 1 does not generate the encryption key of the received group or discards the encryption key generated by the own terminal, The encryption key received from the communication terminal device 1 is stored in the encryption key storage unit 152 as the encryption key of the corresponding group.

  The key generation unit 101 is not limited to the example in which the encryption key is necessarily encrypted and transmitted to the other communication terminal device 1. For example, the encryption key generated by any one of the communication terminal devices 1a, 1b, and 1c is recorded on a recording medium such as a USB memory or a writable recording disk, and another recording medium is used by using the recording medium. By causing the communication terminal device 1 to read the encryption key, the encryption keys of the same group may be the same encryption key in the communication terminal devices 1a, 1b, and 1c.

  Thus, since the key generation unit 101 automatically generates an encryption key and an authentication key based on the unique information of the terminal itself, the encryption key and the authentication key are converted into data having a large number of digits, for example, exceeding 100 digits. Is easy. By using an encryption key or authentication key with a large number of digits in this way, the encryption strength and authentication strength can be increased.

  Note that the present invention is not necessarily limited to the example including the key generation unit 101. For example, the user may input an encryption key and an authentication key using the keyboard 12 and store them in the encryption key storage unit 152 and the authentication key storage unit 153.

  The encryption processing unit 106 encrypts data using the encryption key stored in the encryption key storage unit 152. As an encryption method, various methods can be employed, for example, AES (Advanced Encryption Standard) 256 can be employed.

  The decryption processing unit 107 decrypts the encrypted data using the encryption key stored in the encryption key storage unit 152 by the same method as the encryption processing unit 106. In the case of an encryption method using a decryption key different from the encryption key, the decryption processing unit 107 decrypts the encrypted data using the decryption key stored in the encryption key storage unit 152. .

  Access processing unit 102, local window display processing unit 103 (first display processing unit), server window display processing unit 104 (second display processing unit), window switching unit 105, encryption processing unit 106, decryption processing unit 107, The transmission processing unit 108 and the reception processing unit 109 will be described later.

  FIG. 4 is a block diagram showing an example of the configuration of the server device 2 shown in FIG. The server device 2 illustrated in FIG. 4 includes a server control unit 20, an HDD device 210, and a communication I / F circuit 22. The communication I / F circuit 22 is a communication interface circuit for communicating with the communication terminal devices 1a, 1b, and 1c via the network 3. The HDD device 210 is provided with storage areas of a terminal information storage unit 211 and server side storage units 21A, 21B, and 21C.

  The server control unit 20 includes, for example, a CPU that executes predetermined arithmetic processing, a RAM that temporarily stores data, a peripheral circuit thereof, and the like. The server control unit 20 functions as an authentication processing unit 201, a group information transmission unit 202, a communication processing unit 203, and a registration processing unit 204, for example, by executing a control program stored in the HDD device 210.

  FIG. 5 is an explanatory diagram for explaining information stored in the terminal information storage unit 211 in advance. FIG. 5A shows authentication keys of the communication terminal apparatuses 1a, 1b, and 1c, and FIG. 5B shows group information indicating groups to which the communication terminal apparatuses 1a, 1b, and 1c belong.

  For example, the registration processing unit 204 stores the authentication key of the communication terminal devices 1a, 1b, and 1c transmitted from the communication terminal devices 1a, 1b, and 1c as described above in the terminal information storage unit 211 (FIG. 5A). ). As for the group information, for example, the control unit 10 of the communication terminal device 1a, 1b, 1c reads information indicating the group to which the own terminal belongs from the encryption key storage unit 152, and transmits the information from the communication terminal device 1 to the server device 2. It may be. Alternatively, for example, the user may input the group information by operating the keyboard 12 of the communication terminal device 1 and transmit the group information from the communication terminal device 1 to the server device 2. Then, the group information transmitted from the communication terminal device 1 may be stored in the terminal information storage unit 211 by the registration processing unit 204 (FIG. 5B).

  In the example shown in FIG. 5B, the group information includes information indicating the communication terminal devices 1 that are members of the groups A, B, and C, and groups A and B so that the user can easily identify each group. Information indicating the group names assigned to B and C is included.

  When the groups A, B, and C are registered in this way, the registration processing unit 204 sets the server-side storage units 21A, 21B, and 21C as storage areas (cloud spaces) corresponding to the groups A, B, and C, respectively. Set in HDD device 210. Hereinafter, the server-side storage units 21A, 21B, and 21C are collectively referred to as a server-side storage unit 21.

  Note that the communication terminal devices 1a, 1b, and 1c are not necessarily grouped, and the server-side storage unit 21 may be one.

  The access processing unit 102 of the communication terminal device 1 transmits a request signal for requesting authentication based on the authentication key stored in the authentication key storage unit 153 of the own terminal to the server device 2 via the network 3.

  In the server apparatus 2, when authentication is requested by the access processing unit 102, the authentication processing unit 201 corresponds to the access processing unit 102 that requested the authentication based on the authentication key stored in the terminal information storage unit 211. The communication terminal device 1 to be authenticated is authenticated.

  When authentication by the authentication processing unit 201 succeeds, the group information transmission unit 202 stores the communication terminal device 1 that has succeeded in the authentication in the server-side storage unit 21 corresponding to the group to which the communication terminal device 1 belongs. The group data information indicating the data is transmitted to the communication terminal device 1 that requested the authentication.

  In the communication terminal device 1, the local window display processing unit 103 causes the display 11 to display a local window (first window) for displaying an icon corresponding to the data file stored in the data storage unit 151. For example, the server window display processing unit 104 refers to the encryption key storage unit 152 and causes the display 11 to display server windows corresponding to the groups to which the terminal belongs. The server window display processing unit 104 displays an icon corresponding to the data file stored in the server-side storage unit 21 on the server window (second window).

  When the first operation that is an operation in which the icon displayed in the local window is dragged and dropped to any of the server windows is received by the mouse 13, the transmission processing unit 108 receives the dragged and dropped server window. The encryption key corresponding to the destination group, which is the group corresponding to, is acquired from the encryption key storage unit 152. Then, based on the acquired encryption key, the transmission processing unit 108 causes the encryption processing unit 106 to encrypt the data file corresponding to the dragged and dropped icon, and transmits the encrypted data to the server device 2. The data is transmitted and stored in the server-side storage unit 21 corresponding to the destination group.

  The reception processing unit 109 responds to the dragged and dropped icon when the mouse 13 receives a second operation, which is an operation of dragging and dropping the icon displayed in one of the server windows to the local window. The data file to be transmitted is transmitted from the server device 2, and the encryption key corresponding to the transmission source group that is the group corresponding to the drag-and-drop source server window is acquired from the encryption key storage unit 152. Then, the reception processing unit 109 decrypts the transmitted data file by the decryption processing unit 107 based on the acquired encryption key, and stores the decrypted data file in the data storage unit 151.

  The local window is an example of an area outside the server window. The operation in which the icon displayed in the local window is dragged and dropped into one of the server windows is an example of the first operation in which the icon displayed outside the server window is dragged and dropped into any of the server windows. It is. The operation in which the icon displayed in the server window is dragged and dropped to the local window is an example of a second operation in which the icon displayed in the server window is dragged and dropped outside the server window.

  The transmission processing unit 108 and the reception processing unit 109 may use, for example, a desktop screen or a window other than the server window instead of the local window. Further, the local window display processing unit 103 may not be provided and a local window may not be displayed.

  6 to 9 are flowcharts showing examples of operations of the data communication system and the communication program according to the embodiment of the present invention. In the following flowchart, the same operation is denoted by the same step number, and the description thereof is omitted. FIG. 10 is a screen diagram illustrating an example of a display screen displayed on the display 11.

  First, in the communication terminal device 1, the local window display processing unit 103 causes the display 11 to display a local window W1 for displaying an icon corresponding to the data file stored in the data storage unit 151 (step S1).

  Note that the local window display processing unit 103 has a plurality of areas, for example, “My Document”, “My Picture”, “My Video”, and “My Music” provided in the data storage unit 151. You may display the local space window WL which displays the name of each area | region with a check box. Then, the local window display processing unit 103 may display only the area where the check box is checked in the local window W1.

  Next, the access processing unit 102 transmits a request signal for requesting authentication based on the authentication key stored in the authentication key storage unit 153 of the own terminal to the server device 2 via the network 3 to access the server device 2. (Step S2).

  When authentication is requested by the access processing unit 102, in the server device 2, the authentication processing unit 201 requests the authentication based on the authentication key stored in the terminal information storage unit 211, and the access source communication terminal device 1 is authenticated (step S3).

  The access source communication terminal device 1 can be identified by, for example, header information or identification information transmitted from the communication terminal device 1 during communication.

  As the authentication method, various known methods can be used, and the authentication method is not limited to a specific authentication method. For example, the access processing unit 102 transmits the authentication key stored in the authentication key storage unit 153 of its own terminal to the server device 2, and the authentication processing unit 201 transmits the authentication key and terminal information storage unit transmitted from the communication terminal device 1. If the authentication key stored in 211 matches, the authentication may be determined to be successful. Further, the access processing unit 102 encrypts predetermined data using the authentication key stored in the authentication key storage unit 153 of its own terminal, and transmits the encrypted data to the server device 2. The authentication processing unit 201 may determine that the authentication is successful when the data transmitted from the communication terminal device 1 can be decrypted using the authentication key stored in the terminal information storage unit 211.

  If the authentication has failed (NO in step S4), the authentication processing unit 201 transmits information indicating the authentication failure to the access source communication terminal device 1 (step S5). On the other hand, when the authentication is successful (YES in step S4), the authentication processing unit 201 refers to the group information stored in the terminal information storage unit 211, and corresponds to each group to which the access source communication terminal device 1 belongs. The group data information indicating the data file stored in the server-side storage unit 21 and the information indicating the authentication success are transmitted to the access source communication terminal device 1 (step S6).

  In the communication terminal device 1, the access processing unit 102 determines that the authentication has not succeeded when the authentication failure is notified from the server device 2 (NO in step S <b> 7), and ends the process. On the other hand, when the authentication success is notified from the server device 2, the access processing unit 102 determines that the authentication is successful (YES in step S7), and shifts the processing to step S8.

  In step S8, the server window display processing unit 104 refers to the encryption key storage unit 152, causes the display 11 to display server windows corresponding to the groups to which the terminal belongs, and displays the data indicated by the group data information in the server window. An icon indicating a file is displayed (step S8).

  For example, when the own terminal is the communication terminal device 1c, it belongs to the groups A, B, and C, so that the server window display processing unit 104 has a server window W2A corresponding to the group A as shown in FIG. The server window W2B corresponding to the group B and the server window W2C corresponding to the group C are displayed, and the icons indicating the data files indicated by the group data information are displayed on the server windows W2A, W2B, W2C.

  On the other hand, for example, when the own terminal is the communication terminal device 1a, the server window display processing unit 104 of the communication terminal device 1a does not display the server window W2C because it does not belong to the group C.

  The server window display processing unit 104 is not necessarily limited to an example that displays a server window corresponding to all groups to which the terminal belongs. For example, as shown in FIG. 10, a cloud space window WC that displays a list of groups to which the terminal belongs together with check boxes may be displayed. Then, the server window display processing unit 104 may display only the server window corresponding to the group whose check box is checked. In the example shown in FIG. 10, the own terminal belongs to four groups of the group name “taro@xxx.com”, “AA project”, “BB team”, and “for CC company”, and the check box is checked. In this example, only the server windows W2A, W2B, and W2C corresponding to the groups “AA project”, “BB team”, and “for CC company” are displayed.

  Further, the access processing unit 102 transmits the number of members of each group including the group information, and the server window display processing unit 104 displays the members belonging to each group in the cloud space window WC as shown in FIG. The number (number of people) may be displayed. Further, the server window display processing unit 104 calculates the number of data files that have not been dragged and dropped to the local window W1 among the data files corresponding to each group displayed in the cloud space window WC based on the group data information. Counting may be performed, and the counted number of data files may be associated with each group name and displayed as an unread number on the cloud space window WC.

  Next, the transmission processing unit 108 and the reception processing unit 109 monitor the operation of the mouse 13 by the user (steps S9, S10, S11). When the first operation that is an operation of dragging and dropping the icon from the local window W1 to any of the server windows W2A, W2B, and W2C is received by the mouse 13 (YES in step S9), the transmission processing unit 108 The destination group information indicating the destination group that is the group corresponding to the drag-and-drop destination server window is acquired (step S21), and then the transmission processing unit 108 stores the encryption key corresponding to the destination group in the encryption key storage unit. It acquires from 152 (step S22).

  For example, when an icon is dragged and dropped from the local window W1 to the server window W2C, the transmission processing unit 108 acquires destination group information indicating the group C corresponding to the server window W2C that is the drag and drop destination (step S21). ), An encryption key (CCCCCCCCCC) corresponding to group C is acquired from the encryption key storage unit 152 (step S22).

  Next, the transmission processing unit 108 causes the encryption processing unit 106 to encrypt the data file corresponding to the dragged and dropped icon based on the acquired encryption key (step S23), and the encrypted data is encrypted. It is transmitted to the server apparatus 2 together with the destination group information (step S24).

  Next, in the server device 2, the communication processing unit 203 stores the data transmitted from the communication terminal device 1 in the server-side storage unit 21 corresponding to the destination group indicated by the destination group information (step S25), and the processing Exit.

  As described above, through the processing of steps S8 to S25, the user can easily transfer the data file from the communication terminal device 1 to the server device 2 by simply dragging and dropping the icon from the local window W1 to the server windows W2A, W2B, and W2C. It can be sent encrypted. In this case, the user does not need to be aware of encryption, and the operability is substantially the same as when the server device 2 and the communication terminal device 1 are connected by a dedicated line while ensuring security.

  On the other hand, in step S9, the operation of dragging and dropping the icon from the local window W1 to any of the server windows W2A, W2B, W2C (first operation) is not accepted (NO in step S9), and the icon is displayed by the mouse 13. Is received from the server window W2A, W2B, or W2C to the local window W1 (YES in step S10), the reception processing unit 109 receives the drag-and-drop source server. Source group information indicating a source group that is a group corresponding to the window is acquired (step S31), and then the reception processing unit 109 acquires an encryption key corresponding to the source group from the encryption key storage unit 152. (Step S32).

  For example, when an icon is dragged and dropped from the server window W2C to the local window W1, the reception processing unit 109 acquires transmission source group information indicating the group C corresponding to the server window W2C that is the drag and drop source (Step S1). S31), an encryption key (CCCCCCCCCC) corresponding to group C is acquired from the encryption key storage unit 152 (step S32).

  Next, the reception processing unit 109 requests the server device 2 to transmit a data file corresponding to the dragged and dropped icon (step S33).

  In the server device 2, the communication processing unit 203 transmits the data file requested from the reception processing unit 109 to the requesting communication terminal device 1 (step S34).

  In the communication terminal device 1, the reception processing unit 109 decrypts the data file transmitted from the server device 2 with the encryption key of the transmission source group (step S35), and stores the decrypted data file in the data storage unit 151. (Step S36), and the process ends.

  Note that the reception processing unit 109 does not execute steps S32 and S35, and stores the data file transmitted from the server device 2 in the data storage unit 151 without being decrypted in step S36 without being decrypted. There may be.

  As described above, through the processing of steps S8 to S10 and S31 to S36, the user communicates the data file from the server apparatus 2 with a simple operation by simply dragging and dropping the icon from the server window W2A, W2B, W2C to the local window W1. It can be transmitted to the terminal device 1 in an encrypted state. In this case, the user does not need to be aware of encryption, and the operability is substantially the same as when the server device 2 and the communication terminal device 1 are connected by a dedicated line while ensuring security.

  On the other hand, in step S9, the operation of dragging and dropping the icon from the local window W1 to any of the server windows W2A, W2B, W2C (first operation) is not accepted by the mouse 13 (NO in step S9). In S10, an operation (second operation) for dragging and dropping an icon from any of the server windows W2A, W2B, W2C to the local window W1 is not accepted (NO in step S10), and the server windows W2A, W2B, W2C are received. When a fourth operation, which is an operation of dragging and dropping an icon from any of the windows to a server window other than any of the windows, is accepted (YES in step S11), the steps shown in FIG. 31, S21, S32, S22, S33, S34, S35 are executed in this order.

  As a result, the data file encrypted and stored in the server-side storage unit corresponding to the transmission source group in the server device 2 is decrypted in the communication terminal device 1.

  Next, the transmission processing unit 108 causes the encryption processing unit 106 to encrypt the decrypted data file with the encryption key of the destination group (step S41).

  Next, the transmission processing unit 108 transmits the encrypted data to the server device 2 (step S24).

  Next, in the server device 2, the communication processing unit 203 stores the data transmitted from the communication terminal device 1 in the server-side storage unit 21 corresponding to the destination group (step S25), and ends the process.

  As described above, by the processes of steps S8 to S11, S31, S21, S32, S22, S33, S34, S35, S41, S24, and S25, the user can change from any one of the server windows W2A, W2B, and W2C to the other. Data files can be transferred between the server-side storage units 21 belonging to different groups by a simple operation of simply dragging and dropping an icon to the server window. In this case, by using the communication terminal devices belonging to the two groups, the user does not need to be aware of encryption, and can transfer data between the two groups while ensuring security.

  Further, according to the data communication system 100 shown in FIG. 1, the data is encrypted and transmitted to the network 3. The data is encrypted and stored in the server-side storage units 21A, 21B, and 21C of the server device 2. Accordingly, since there is no decrypted data on the network 3 and the server device 2, so-called cloud space, the security is improved.

  Further, the encryption key is stored only in the communication terminal device 1 and is not stored in the server device 2. Therefore, even if the data stored in the server-side storage units 21A, 21B, and 21C of the server device 2 is illegally read by a third party, the data is encrypted and the data is decrypted. It is not possible to obtain the encryption key for the server device 2 from the server device 2. This improves security.

  Communication terminal devices 1a, 1b, and 1c are grouped, and an encryption key is provided for each group. Therefore, the communication terminal apparatus 1 that does not belong to the group A cannot decrypt the data encrypted with the group A encryption key. Accordingly, the communication terminal devices 1 in different groups are the same as if the line is not connected. According to the grouping example shown in FIG. 5B, the group A virtually connects the server device 2 and the communication terminal devices 1a and 1b on the network 3, as shown in FIG. It has the same significance as that connected with. As shown in FIG. 11B, the group B has the same significance as when the server apparatus 2 and the communication terminal apparatuses 1b and 1c are virtually connected on the network 3 through dedicated lines. As shown in FIG. 11C, the group C has the same significance as when the server apparatus 2 and the communication terminal apparatuses 1a, 1b, and 1c are virtually connected on the network 3 through dedicated lines. Yes.

  When the first operation is accepted in step S9 (YES in step S9), the transmission processing unit 108 may cause the display 11 to display an encryption selection menu for selecting whether or not to perform encryption. Good. Further, when the second operation is accepted in step S10 (YES in step S10), the reception processing unit 109 may cause the display 11 to display a decoding selection menu for selecting whether or not to perform decoding. Good.

  FIG. 15 is an explanatory diagram for explaining the operation when displaying the encryption selection menu and the decryption selection menu. When the first operation OP1 in which the icon is dragged and dropped from the local window W1 to the server window W2A is accepted in step S9 (YES in step S9), the transmission processing unit 108 displays the encryption selection menu M1. The encryption selection menu M1 can select “upload as it is” without encryption and “encrypt and upload” with encryption.

  When the user operates the mouse 13 and selects “encrypt and upload”, steps S21 to S25 shown in FIG. 7 are executed, and the encrypted data is stored in the server-side storage unit. On the other hand, when the user operates the mouse 13 to select “Upload as is”, Steps S22 and S23 are not executed, Step S21 is executed, and Steps S24 and S25 are executed for the unencrypted data file. The

  As a result, data that does not need to be kept secret can be stored in the server-side storage unit 21 without being encrypted by a simple operation, so that convenience for the user is improved. The transmission processing unit 108 may display, for example, “cancel” instead of “upload as it is” as an option for not performing encryption in the encryption selection menu M1. Then, when “cancel” is selected, the transmission processing unit 108 may shift to step S10 without shifting to step S21.

  Further, when the second operation OP2 in which the icon is dragged and dropped from the server window W2B to the local window W1 is accepted in step S10 (YES in step S10), the reception processing unit 109 displays the decryption selection menu M2. To do. The decryption selection menu M2 allows selection of “download as is” without decryption and “download and decrypt” with decryption.

  When the user operates the mouse 13 to select “download and decrypt”, steps S31 to S36 shown in FIG. 8 are executed, and the decrypted data is stored in the data storage unit 151. On the other hand, when the user operates the mouse 13 and selects “download as it is”, steps S31, S33, and S34 are executed without executing steps S32 and S35, and the data file that has been encrypted in step S36. Is stored in the data storage unit 151.

  As a result, data that is desired to be encrypted even on the local communication terminal device can be stored in the data storage unit 151 without being decrypted by a simple operation, thereby improving user convenience. To do. Note that the reception processing unit 109 may display, for example, “cancel” instead of “download as it is” as an option not to perform decryption in the decryption selection menu M2. Then, when “cancel” is selected, the reception processing unit 109 may shift to step S11 without shifting to step S31.

  The data communication system 100 may include a plurality of server devices 2. FIG. 12 is an explanatory diagram for explaining an operation when the data communication system 100 includes the server device 2a (first server device) and the server device 2b (second server device) as the server device 2. .

  The server device 2a includes a server-side storage unit 21A, and the server device 2b includes a server-side storage unit 21B. The server devices 2 a and 2 b are configured in the same manner as the server device 2 shown in FIG. 4 except for the server-side storage unit 21.

  In this case, the server-side storage unit 21A corresponds to the group A, and the server-side storage unit 21B corresponds to the group B. Therefore, according to the group information shown in FIG. The server device 2a including the side storage unit 21A and the server device 2b including the server side storage unit 21B can be accessed.

  As a result, the server window display processing unit 104 of the communication terminal device 1b displays on the display 11 a server window W2A (AA project) corresponding to the server device 2a and a server window W2B (BB team) corresponding to the server device 2b. Display.

  In this state, when the user operates the mouse 13 to perform a fourth operation of dragging and dropping an icon displayed on the server window W2A to the server window W2B, steps S1 to S11 in FIG. 6 and step S31 in FIG. 9 are performed. , S21, S32, S22, S33, S34, S35, S41, S24, S25 are executed in this order.

  As a result, the user can secure security from the server apparatus 2a to the server apparatus 2b by simply dragging and dropping an icon between the two server windows W2A and W2B respectively corresponding to the server apparatuses 2a and 2b. Data can be transferred.

  Note that the server-side storage unit 21A of the server device 2a and the server-side storage unit 21B of the server device 2b may be associated with the same group. Further, the communication terminal devices 1a, 1b, and 1c may not be grouped, and the server-side storage units 21A and 21B may be made accessible regardless of the grouping.

  Server devices 2a and 2b may be server devices operated by different communication providers. Usually, each communication provider has its own communication protocol and rules for access. Therefore, it is not possible to directly transfer data between a server device operated by the provider X and a server device operated by the provider Y. Have difficulty.

However, according to the data communication system 100, by using the communication terminal device 1, the user can simply drag and drop icons between the server windows W2A and W2B as shown in FIG. Data can be transferred from the server apparatus 2a operated by a different provider to the server apparatus 2b while ensuring security.
(Second Embodiment)

  Next, a data communication system 100 'according to the second embodiment of the present invention will be described. The data communication system 100 ′ according to the second embodiment is different from the data communication system 100 according to the first embodiment in the configurations of the communication terminal devices 1 a ′, 1 b ′, and 1 c ′. Hereinafter, the communication terminal devices 1a ', 1b', and 1c 'are collectively referred to as a communication terminal device 1'.

  FIG. 13 is a block diagram showing an example of the configuration of the communication terminal device 1 ′ according to the second embodiment of the present invention. The communication terminal device 1 ′ shown in FIG. 13 is different from the communication terminal device 1 shown in FIG. 2 in that a touch panel display 16 (display unit, operation unit) is provided instead of the display 11, the keyboard 12, and the mouse 13. The difference is that the unit 151, the encryption key storage unit 152, and the authentication key storage unit 153 are configured by the flash memory 15 ′, and the control unit 10 ′ further functions as the window switching unit 105.

  Since the other configuration is the same as that of the communication terminal device 1 shown in FIG. 2, the description thereof is omitted, and the characteristic points of the present embodiment will be described below. The communication terminal device 1 ′ is, for example, a portable communication terminal device called a so-called smartphone.

  The touch panel display 16 is different from the mouse 13 in that the drag and drop operation described above becomes a touch operation. That is, drag and drop in the communication terminal device 1 is performed by pressing the mouse button while the icon and the mouse pointer overlap, moving the mouse as it is, moving the icon, and releasing the mouse button at the target position to drop the icon. It is an operation to do. On the other hand, the drag-and-drop in the communication terminal device 1 ′ is an operation in which the icon is touched with a finger, the icon is moved by moving the finger while touching, and the icon is dropped by moving the finger from the screen at the target position. It is.

  FIG. 14 is an explanatory diagram illustrating an example of a display screen displayed on the touch panel display 16. Since the touch panel display 16 of the portable communication terminal device normally has a small display area, it is difficult to display a plurality of windows simultaneously.

  Therefore, as shown in FIG. 14A, the window switching unit 105, for example, “local space” that means the data storage unit 151 and “AA project” that is the name of the groups A, B, and C to which the terminal belongs. , “BB team” and “for CC company” are displayed on the touch panel display 16 so as to be selectable.

  In this state, when the user touches, for example, “local space”, the window switching unit 105 causes the local window display processing unit 103 to display the local window W1 (FIG. 14B). In the local window W1, an icon indicating a data file stored in the data storage unit 151 is displayed. Similarly, when the user touches “AA project”, “BB team”, “for CC company”, the server window display processing unit 104 displays a server window corresponding to the touch-selected group.

  Then, the window switching unit 105 drags an icon displayed on the local window W1, for example, and when the icon reaches the edge of the local window W1 in the process of being moved by the dragging, the server window display processing unit 104 To display the server window W2A (FIG. 14C). The user can drop the icon displayed in the local window W1 on the server window W2A by separating the fingertip from the touch panel display 16 after the server window W2A is displayed.

  When the drag operation is continued without separating the fingertip while the icon dragged by the user is positioned at the edge of the window, the window switching unit 105 displays the displayable windows, for example, the server windows W2A, W2B, W2C, and The local window W1 may be sequentially switched and displayed at predetermined time intervals by the server window display processing unit 104 and the local window display processing unit 103.

By adopting such a configuration, the communication terminal device 1 ′ can perform a drag-and-drop operation (first operation) from the local window W1 to the server windows W2A, W2B, and W2C, similarly to the communication terminal device 1 shown in FIG. A drag and drop operation (second operation) from the server windows W2A, W2B, and W2C to the local window W1 and a drag and drop operation (fourth operation) between the server windows W2A, W2B, and W2C are possible.
(Third embodiment)

  Next, a data communication system 100 '' according to a third embodiment of the present invention will be described. The data communication system 100 ″ according to the third embodiment is different from the data communication system 100 according to the first embodiment in the configuration of the communication terminal devices 1a ″, 1b ″, 1c ″, and the server device 2 ″. Is different. Hereinafter, the communication terminal devices 1 a ″, 1 b ″, and 1 c ″ are collectively referred to as the communication terminal device 1 ″.

  FIG. 16 is a block diagram showing an example of the configuration of the communication terminal device 1 ″ according to the third embodiment of the present invention. The communication terminal device 1 ″ illustrated in FIG. 16 is different from the communication terminal device 1 illustrated in FIG. 2 in that the control unit 10 ″ further includes an execution processing unit 110 and a message processing unit 111. In other respects, the communication terminal device 1 ″ is configured in the same manner as the communication terminal device 1.

  FIG. 17 is a block diagram illustrating an example of the configuration of the server device 2 ″ according to the third embodiment of the present invention. 17 differs from the server apparatus 2 shown in FIG. 4 in that the server control unit 20 ″ further includes a message transfer unit 205. Since the other configuration is the same as that of the communication terminal device 1, the description thereof is omitted, and the characteristic points of the present embodiment will be described below.

  First, the data file stored in the data storage unit 151 includes attribute information indicating processing to be executed on the data file. For example, the extension of “.doc”, “.jpg”, “.exe”, etc. is added to the part below the dot, such as XXX.doc, XXX.jpg, XXX.exe, etc. Has been. The extension is an example of attribute information.

  For example, if the extension is “.doc”, this indicates that the data file should be opened by a word processor, and if the extension is “.jpg”, the data file should be opened by an image viewer. If the extension is “.exe”, the data file is an executable file, and the data file itself should be executed. As described above, the processes to be executed corresponding to various extensions are stored in advance in, for example, the HDD device 15.

  The execution processing unit 110 can identify and execute processes corresponding to various attribute information (extensions) by referring to the HDD device 15, for example.

  Further, when the mouse 13 accepts a third operation that is a double-click operation for an icon corresponding to an encrypted data file displayed in the server windows W2A, W2B, and W2C, the execution processing unit 110 receives the icon. Is read from the server-side storage units 21A, 21B, and 21C by the server device 2 '' and transmitted, and the transmitted data file is decrypted by the decryption processing unit 107, and the decrypted data file is decoded. The process corresponding to the attribute information (extension) included in the data is executed on the decrypted data file.

  Double click is an example of the third operation, and the third operation is not limited to double click. For example, when the touch panel display 16 is used as the operation unit, the tap operation can be used as an example of the third operation.

  18 and 19 are flowcharts mainly showing an example of the operation of the execution processing unit 110 in the data communication system and the communication program according to the third embodiment of the present invention. The processes in steps S1 to S11 shown in FIG. 18 are the same as those in the flowchart shown in FIG. In step S11, the fourth operation is not accepted (NO in step S11), and when the third operation is accepted (YES in step S12), steps S31 and S32 in FIG. 19 are executed.

  Next, the execution processing unit 110 requests the server apparatus 2 ″ to transmit a data file corresponding to the double-clicked icon (Step S51).

  Next, after steps S34 and S35 are executed, the execution processing unit 110 acquires attribute information from the data file decrypted in step S35 (step S52). Next, the execution processing unit 110 executes a process according to the attribute information acquired in step S52 on the data file decrypted in step S35. For example, if the attribute information is “.jpg”, the execution processing unit 110 opens the data file with an image viewer, and if the attribute information is “.exe”, the execution processing unit 110 executes the data file.

  According to the execution processing unit 110, the user can execute an execution process using the data file with a simple operation by double-clicking the icon of the data file stored in the server-side storage unit in an encrypted state. Can do. Further, since the data file is transmitted from the server device 2 ″ to the communication terminal device 1 ″ in an encrypted state and decrypted by the communication terminal device 1 ″, the server device is maintained while maintaining security. Execution processing using the data file stored in 2 ″ can be performed.

  FIG. 20 is a screen diagram for explaining the operation of the message processing unit 111. The message processing unit 111 of the communication terminal device 1 ″ displays a message window WM on which the user can write a message on the display 11 corresponding to the server window W2A displayed by the server window display processing unit 104. In the message window WM, for example, using the keyboard 12, the user can write a message such as "Data sent".

  Further, the message processing unit 111 causes the encryption processing unit 106 to convert the message written in the message window WM using the encryption key “AAAAAAAAAAA” corresponding to the group A corresponding to the server window W2A corresponding to the message window WM. Encryption is performed, and the encrypted message is transmitted as an encrypted message from the communication terminal device 1 ″ to the server device 2 ″.

  The message transfer unit 205 in the server device 2 ″ transmits the encrypted message transmitted from the communication terminal device 1 ″ to the other communication terminal device 1 ″ belonging to the target group Group A.

  When the message processing unit 111 of the other communication terminal device 1 ″ belonging to the group A receives the encrypted message from the server device 2 ″, the message processing unit 111 uses the decryption key corresponding to the target group Group A. Is decrypted by the decryption processing unit 107, and the decrypted message is displayed on the message window WM corresponding to the group A.

  As a result, the user can send a message to other users belonging to the same group as the message window WM in which the message is written by a simple operation.

Instead of the communication terminal device 1 ″, the communication terminal device may be configured by adding the execution processing unit 110 and the message processing unit 111 to the control unit 10 ′ of the communication terminal device 1 ′.
(Fourth embodiment)

  Next, a server apparatus 2 "" according to a fourth embodiment of the present invention will be described. FIG. 21 is a block diagram illustrating an example of the configuration of the server device 2 ″ ″. The server device 2 ′ ″ shown in FIG. 21 is different from the server device 2 ″ shown in FIG. 17 in that the HDD device 210 ′ does not include the server-side storage units 21A, 21B, and 21C. Further, the data storage and reading operations for the server-side storage unit by the communication processing unit 203 ′ are different.

  The server device 2 ″ ″ constitutes a data communication system in combination with the communication terminal device 1 ″ instead of the server device 2 ″ in the data communication system 100 ″. Alternatively, the data communication system may be configured by combining the server device obtained by removing the message transfer unit 205 from the server device 2 ″ ″ with the communication terminal device 1 or the communication terminal device 1 ′.

  The communication I / F circuit 23 is connected to three server devices 41, 42, and 43 (storage server devices) via a LAN (Local Area Network) 5 (communication path). As a result, the server device 2 ″ ″ can exchange data with the server devices 41, 42, 43 via the LAN 5. Note that although the LAN 5 is shown as an example of the communication path, the communication path is not limited to the LAN, and various systems such as USB (Universal Serial Bus) and serial ATA can be used.

  In other respects, the server device 2 "" is configured in the same manner as the server device 2 "", and thus the description thereof is omitted.

  Each of the server devices 41, 42, and 43 includes a storage device such as an HDD device. The storage areas corresponding to the groups A, B, and C are distributed and arranged in the server devices 41, 42, and 43, respectively. Specifically, the storage areas corresponding to the server-side storage unit 21A (group A) are distributed and arranged in the server devices 41, 42, and 43. Similarly, the storage area corresponding to the server-side storage unit 21B (group B) is distributed and arranged in the server devices 41, 42, and 43, and the storage area corresponding to the server-side storage unit 21C (group C) is the server The devices 41, 42, and 43 are distributed.

  That is, the server apparatuses 41, 42, and 43 constitute server side storage units 21A, 21B, and 21C. And storing the data in the server-side storage unit 21A means that the data is distributed and stored in the storage area corresponding to the group A of the server devices 41, 42, and 43, and the data is stored in the server-side storage unit 21B. Is stored in the storage area corresponding to the group B of the server devices 41, 42, and 43, and storing the data in the server-side storage unit 21C is the server device 41. , 42 and 43, the data is distributed and stored in the storage area corresponding to the group C.

  When storing the data file in the server-side storage unit 21, the communication processing unit 203 ′ distributes and stores the data in the server devices 41, 42, and 43 by a method known as a so-called secret sharing method. Further, when the communication processing unit 203 ′ reads data from the server-side storage unit 21, the communication processing unit 203 ′ restores the original data file from the data distributed and stored in the server devices 41, 42, and 43.

  As the secret sharing method, various methods can be used. For example, the Shamir secret sharing method can be used.

  Specifically, the communication processing unit 203 ′, in step S25 of FIG. 7 and FIG. 9, receives a plurality of data transmitted from the communication terminal device 1 ″ (1, 1 ′), that is, encrypted data. For example, the data is divided into three to generate a plurality of divided data. Then, the communication processing unit 203 ′ stores a plurality of divided data in the server devices 41, 42 and 43 in a distributed manner.

  Further, the communication processing unit 203 ′ reads a plurality of divided data corresponding to the data requested from the reception processing unit 109 from the server devices 41, 42, and 43 in step S34 of FIG. 8 and FIG. Restore the original encrypted data file from the data. Then, the communication processing unit 203 'transmits the restored data file to the requesting communication terminal device 1 "(1, 1').

  According to Shamiya's secret sharing method, it is possible to restore the original data based on a part of the divided data, for example, two of the divided data. Thereby, when the data is read out, the communication processing unit 203 ′ may normally restore the original data file from the two data read from the two server devices, for example, the server devices 41 and 42. If the communication processing unit 203 ′ cannot read data normally from one of the two server devices, the communication processing unit 203 ′ further reads data from the remaining server device 43 to obtain the original encrypted data. The file may be restored.

  According to the server device 2 ″ ″, the encrypted data is further divided and distributed and stored in a plurality of server devices, so that the strength of security is improved. Further, when the original data is restored from the divided data having a smaller number of divisions by Shamiya's secret sharing method, a part of the divided divided data is lost due to a failure, for example. However, since the original encrypted data can be restored from the remaining divided data, the reliability of data storage can be improved.

  The server devices 41, 42, and 43 are communication paths different from the network 3 that is a public line, and are connected to the server device ″ ″ via the LAN 5 that is separated from the network 3. Therefore, since it is not possible to access the server apparatuses 41, 42, and 43 from the outside via the network 3, the strength of security of the divided data stored in the server apparatuses 41, 42, and 43 is improved.

1, 1 ′, 1 ″, 1a, 1b, 1c Communication terminal device 2, 2 ″, 2 ′ ″ Server device 2a Server device (first server device)
2b server device (second server device)
3 Network 5 LAN (communication path)
10, 10 ', 10''Control unit 11 Display (display unit)
12 Keyboard 13 Mouse (operation unit)
14, 22 Communication I / F circuit 15 HDD device 15 ′ Flash memory 16 Touch panel display 20, 20 ″, 20 ′ ″ Server control unit 21, 21A, 21B, 21C Server side storage unit 41, 42, 43 Server device ( Storage server device)
100, 100 ′, 100 ″ Data communication system 101 Key generation unit 102 Access processing unit 103 Local window display processing unit 104 Server window display processing unit 105 Window switching unit 106 Encryption processing unit 107 Decryption processing unit 108 Transmission processing unit 109 Reception processing unit 111 Message processing unit 151 Data storage unit 152 Encryption key storage unit 153 Authentication key storage unit 201 Authentication processing unit 202 Group information transmission unit 203 Communication processing unit 204 Registration processing unit 205 Message transfer unit 210, 210 ′ HDD device 211 Terminal Information storage unit M1 Encryption selection menu M2 Decryption selection menu W1 Local window W2A, W2B, W2C Server window WM Message window

Claims (13)

A server device for storing and reading the data with respect to a server-side storage unit for storing data;
Including a communication terminal device connected to be able to transmit and receive data via the network with the server device,
The communication terminal device
A display for displaying an image;
An operation unit for receiving user operations;
A data storage unit for storing data;
An encryption key storage unit for storing an encryption key used for encryption and a decryption key used for decryption ;
A server window display processing unit for displaying a server window, which is a window for displaying an icon corresponding to data stored in the server-side storage unit, by the display unit;
An encryption processing unit for encrypting data using the encryption key;
A decryption processing unit for decrypting data using the decryption key;
Data corresponding to the dragged and dropped icon is received based on the fact that the first operation, which is an operation of dragging and dropping the icon displayed outside the server window by the operation unit to the server window, is accepted. A transmission processing unit that performs encryption processing by the encryption processing unit, transmits the encrypted data to the server device, and stores the data in the server-side storage unit ;
Data corresponding to the dragged and dropped icon is received based on the fact that a second operation, which is an operation in which the icon displayed on the server window by the operation unit is dragged and dropped outside the server window, is accepted. A reception processing unit that executes a reception process of causing the server device to read and transmit the data from the server-side storage unit, and decoding the transmitted data by the decoding processing unit and storing the data in the data storage unit; Prepared,
The data includes attribute information indicating processing to be performed on the data,
The communication terminal device receives a third operation, which is an operation for instructing an icon displayed on the server window to execute a process using data corresponding to the icon, by the operation unit. The data corresponding to the icon is read from the server-side storage unit by the server device and transmitted, the transmitted data is decrypted by the decryption processing unit, and is included in the decrypted data An execution processing unit that executes processing according to the attribute information on the decrypted data;
The data communication system, wherein the third operation is a double click or tap operation. A server device for storing and reading the data with respect to a server-side storage unit for storing data;
A communication terminal device which is capable of transmitting and receiving data connected through the server device and the network A including data communications system,
The communication terminal device
A display for displaying an image;
An operation unit for receiving user operations;
A data storage unit for storing data;
An encryption key storage unit for storing an encryption key used for encryption and a decryption key used for decryption ;
A server window display processing unit for displaying a server window, which is a window for displaying an icon corresponding to data stored in the server-side storage unit, by the display unit;
An encryption processing unit for encrypting data using the encryption key;
A decryption processing unit for decrypting data using the decryption key;
Data corresponding to the dragged and dropped icon is received based on the fact that the first operation, which is an operation of dragging and dropping the icon displayed outside the server window by the operation unit to the server window, is accepted. A transmission processing unit that performs encryption processing by the encryption processing unit, transmits the encrypted data to the server device, and stores the data in the server-side storage unit;
The data communication system includes a plurality of the communication terminal devices,
The plurality of communication terminal devices are grouped into a plurality of groups,
The encryption key storage unit stores the encryption key in association with one or more groups to which the terminal belongs, and stores the decryption key in association with one or more groups to which the terminal belongs;
The encryption keys corresponding to the same group stored in the encryption key storage units of the communication terminal devices are the same encryption keys, and the decryption keys corresponding to the same group are the same decryption keys. ,
The server device includes a plurality of the server-side storage units corresponding to the plurality of groups,
The server window display processing unit causes the display unit to display one or a plurality of the server windows respectively corresponding to the one or a plurality of groups to which the terminal belongs.
Each of the communication terminal devices is
When a plurality of the server windows are displayed by the display unit, an icon displayed on one of the plurality of server windows by the operation unit is displayed on a server window different from any one of the server windows. When a fourth operation that is a drag-and-drop operation is accepted, the server device causes the server device to read and transmit data corresponding to the drag-and-drop icon from the server-side storage unit, and the drag-and-drop operation A reception processing unit that acquires a decryption key corresponding to a group corresponding to the original server window from the encryption key storage unit, and based on the acquired decryption key, decrypts the transmitted data by the decryption processing unit When,
An encryption key corresponding to the group corresponding to the other server window is acquired from the encryption key storage unit, and the decrypted data is encrypted by the encryption processing unit based on the acquired encryption key, A data communication system further comprising: a transmission processing unit that transmits encrypted data to the server device and stores the encrypted data in a server-side storage unit corresponding to a group corresponding to the other server window. The server device includes a first server device and a second server device,
The data communication system according to claim 2 , wherein the server window display processing unit causes the display unit to display the server window corresponding to the first server device and the second server device. There a server device to the server-side storage unit for storing data performs storage and readout of the data, and a communication terminal device which is capable of transmitting and receiving data connected through the server device and the network by including the data communication system And
The communication terminal device
A display for displaying an image;
An operation unit for receiving user operations;
A data storage unit for storing data;
An encryption key storage unit for storing an encryption key used for encryption and a decryption key used for decryption ;
A server window display processing unit for displaying a server window, which is a window for displaying an icon corresponding to data stored in the server-side storage unit, by the display unit;
An encryption processing unit for encrypting data using the encryption key;
A decryption processing unit for decrypting data using the decryption key;
Data corresponding to the dragged and dropped icon is received based on the fact that the first operation, which is an operation of dragging and dropping the icon displayed outside the server window by the operation unit to the server window, is accepted. A transmission processing unit that performs encryption processing by the encryption processing unit, transmits the encrypted data to the server device, and stores the data in the server-side storage unit;
The data communication system includes a plurality of the communication terminal devices,
The plurality of communication terminal devices are grouped into a plurality of groups,
The encryption key storage unit stores the encryption key in association with one or more groups to which the terminal belongs, and stores the decryption key in association with one or more groups to which the terminal belongs;
The encryption keys corresponding to the same group stored in the encryption key storage units of the communication terminal devices are the same encryption keys, and the decryption keys corresponding to the same group are the same decryption keys. ,
The server device includes a plurality of the server-side storage units corresponding to the plurality of groups,
The server window display processing unit causes the display unit to display one or a plurality of the server windows respectively corresponding to the one or a plurality of groups to which the terminal belongs.
Each of the communication terminal devices displays a message window in which a user can write a message on the display unit corresponding to the server window displayed by the server window display processing unit, and the message window is written to the message window. The message is encrypted by the encryption processing unit using the encryption key corresponding to the target group which is the group corresponding to the server window corresponding to the message window, and the encrypted message is used as the encrypted message. A message processing unit to be transmitted to the server device;
The server device further includes a message transfer unit that transmits the encrypted message to another communication terminal belonging to the target group,
The message processing unit, when receiving the encrypted message from the server device, causes the decryption processing unit to decrypt the decrypted message using the decryption key corresponding to the target group, and the decrypted message to the target A data communication system to be displayed in the message window corresponding to a group. A server device for storing and reading the data with respect to a server-side storage unit for storing data;
Including a communication terminal device connected to be able to transmit and receive data via the network with the server device,
The communication terminal device
A display for displaying an image;
An operation unit for receiving user operations;
A data storage unit for storing data;
An encryption key storage unit for storing an encryption key used for encryption and a decryption key used for decryption ;
A server window display processing unit for displaying a server window, which is a window for displaying an icon corresponding to data stored in the server-side storage unit, by the display unit;
An encryption processing unit for encrypting data using the encryption key;
A decryption processing unit for decrypting data using the decryption key,
The server device includes a first server device and a second server device,
The server window display processing unit causes the display unit to display the server window corresponding to the first server device and the second server device,
The communication terminal device
When an operation for dragging and dropping an icon displayed in the server window corresponding to the first server device to the server window corresponding to the second server device is accepted by the operation unit, the icon is dragged and dropped. A reception processing unit that causes the data corresponding to the icon to be transmitted from the first server device, and that the transmitted data is decrypted by the decryption processing unit based on the decryption key;
The decrypted data is encrypted based on the encryption key by the encryption processing unit, and the encrypted data is transmitted to the second server device and stored in the server-side storage unit of the second server device A data communication system further comprising a transmission processing unit . A communication terminal device connected to a server device for storing and reading data with respect to a server device for storing and reading data via a network.
A display for displaying an image;
An operation unit for receiving user operations;
A data storage unit for storing data;
An encryption key storage unit for storing an encryption key used for encryption and a decryption key used for decryption ;
A server window display processing unit for displaying a server window, which is a window for displaying an icon corresponding to data stored in the server-side storage unit, by the display unit;
An encryption processing unit for encrypting data using the encryption key;
A decryption processing unit for decrypting data using the decryption key;
Data corresponding to the dragged and dropped icon is received based on the fact that the first operation, which is an operation of dragging and dropping the icon displayed outside the server window by the operation unit to the server window, is accepted. A transmission processing unit that performs encryption processing by the encryption processing unit, transmits the encrypted data to the server device, and stores the data in the server-side storage unit ;
Data corresponding to the dragged and dropped icon is received based on the fact that a second operation, which is an operation in which the icon displayed on the server window by the operation unit is dragged and dropped outside the server window, is accepted. A reception processing unit that executes a reception process of causing the server device to read and transmit the data from the server-side storage unit, and decoding the transmitted data by the decoding processing unit and storing the data in the data storage unit; Prepared,
The data includes attribute information indicating processing to be performed on the data,
The communication terminal device
When a third operation, which is an operation for instructing an icon displayed on the server window to execute processing using data corresponding to the icon, is received by the operation unit, the icon corresponds to the icon. Data is read from the server-side storage unit by the server device and transmitted, the transmitted data is decrypted by the decryption processing unit, and according to the attribute information included in the decrypted data An execution processing unit for executing processing on the decrypted data;
The communication terminal apparatus , wherein the third operation is a double click or a tap operation . A communication terminal device connected to a server device for storing and reading data with respect to a server device for storing and reading data via a network.
A display for displaying an image;
An operation unit for receiving user operations;
A data storage unit for storing data;
An encryption key storage unit for storing an encryption key used for encryption and a decryption key used for decryption ;
A server window display processing unit for displaying a server window, which is a window for displaying an icon corresponding to data stored in the server-side storage unit, by the display unit;
An encryption processing unit for encrypting data using the encryption key;
A decryption processing unit for decrypting data using the decryption key;
Data corresponding to the dragged and dropped icon is received based on the fact that the first operation, which is an operation of dragging and dropping the icon displayed outside the server window by the operation unit to the server window, is accepted. A transmission processing unit that performs encryption processing by the encryption processing unit, transmits the encrypted data to the server device, and stores the data in the server-side storage unit;
The communication terminal devices are grouped into one or more groups among a plurality of groups,
The encryption key storage unit stores the encryption key in association with one or more groups to which the terminal belongs, and stores the decryption key in association with one or more groups to which the terminal belongs;
The encryption keys corresponding to the same group stored in the encryption key storage unit of the communication terminal device are mutually equivalent encryption keys, and the decryption keys corresponding to the same group are mutually equal decryption keys,
The server window display processing unit causes the display unit to display one or a plurality of the server windows respectively corresponding to the one or a plurality of groups to which the terminal belongs.
The communication terminal device
When a plurality of the server windows are displayed by the display unit, an icon displayed on one of the plurality of server windows by the operation unit is displayed on a server window different from any one of the server windows. When a fourth operation that is a drag-and-drop operation is accepted, the server device causes the server device to read and transmit data corresponding to the drag-and-drop icon from the server-side storage unit, and the drag-and-drop operation A reception processing unit that acquires a decryption key corresponding to a group corresponding to the original server window from the encryption key storage unit, and based on the acquired decryption key, decrypts the transmitted data by the decryption processing unit When,
An encryption key corresponding to the group corresponding to the other server window is acquired from the encryption key storage unit, and the decrypted data is encrypted by the encryption processing unit based on the acquired encryption key, A communication terminal device further comprising: a transmission processing unit that transmits encrypted data to the server device and stores the encrypted data in a server-side storage unit corresponding to a group corresponding to the other server window . A communication terminal device connected to a server device for storing and reading data with respect to a server device for storing and reading data via a network.
A display for displaying an image;
An operation unit for receiving user operations;
A data storage unit for storing data;
An encryption key storage unit for storing an encryption key used for encryption and a decryption key used for decryption ;
A server window display processing unit for displaying a server window, which is a window for displaying an icon corresponding to data stored in the server-side storage unit, by the display unit;
An encryption processing unit for encrypting data using the encryption key;
A decryption processing unit for decrypting data using the decryption key;
Data corresponding to the dragged and dropped icon is received based on the fact that the first operation, which is an operation of dragging and dropping the icon displayed outside the server window by the operation unit to the server window, is accepted. A transmission processing unit that performs encryption processing by the encryption processing unit, transmits the encrypted data to the server device, and stores the data in the server-side storage unit;
The communication terminal devices are grouped into one or more groups among a plurality of groups,
The encryption key storage unit stores the encryption key in association with one or more groups to which the terminal belongs, and stores the decryption key in association with one or more groups to which the terminal belongs;
The encryption keys corresponding to the same group stored in the encryption key storage unit are mutually equivalent encryption keys, and the decryption keys corresponding to the same group are mutually equivalent decryption keys,
The server window display processing unit causes the display unit to display one or a plurality of the server windows respectively corresponding to the one or a plurality of groups to which the terminal belongs.
The communication terminal device displays a message window in which a user can write a message corresponding to each of the server windows displayed by the server window display processing unit, and displays the message written in the message window. Is encrypted by the encryption processing unit using the encryption key corresponding to the target group which is a group corresponding to the server window corresponding to the message window, and the encrypted message is encrypted as the encrypted message. A message processing unit to be transmitted to the device;
The message processing unit, when receiving the encrypted message from the server device, causes the decryption processing unit to decrypt the decrypted message using the decryption key corresponding to the target group, and the decrypted message to the target A communication terminal device displayed on the message window corresponding to a group . A communication terminal device connected to a server device for storing and reading data with respect to a server device for storing and reading data via a network.
A display for displaying an image;
An operation unit for receiving user operations;
A data storage unit for storing data;
An encryption key storage unit for storing an encryption key used for encryption and a decryption key used for decryption ;
A server window display processing unit for displaying a server window, which is a window for displaying an icon corresponding to data stored in the server-side storage unit, by the display unit;
An encryption processing unit for encrypting data using the encryption key;
A decryption processing unit for decrypting data using the decryption key,
The server device includes a first server device and a second server device,
The server window display processing unit causes the display unit to display the server window corresponding to the first server device and the second server device,
The communication terminal device
When an operation for dragging and dropping an icon displayed in the server window corresponding to the first server device to the server window corresponding to the second server device is accepted by the operation unit, the icon is dragged and dropped. A reception processing unit that causes the data corresponding to the icon to be transmitted from the first server device, and that the transmitted data is decrypted by the decryption processing unit based on the decryption key;
The decrypted data is encrypted based on the encryption key by the encryption processing unit, and the encrypted data is transmitted to the second server device and stored in the server-side storage unit of the second server device A communication terminal device further comprising a transmission processing unit . A server device for storing and reading data with respect to a server-side storage unit for storing data is connected to the server device via a network so that data can be transmitted and received, a display unit for displaying images, and an operation unit for receiving user operations A communication terminal device that is a computer equipped with
A data storage unit for storing data;
An encryption key storage unit for storing an encryption key used for encryption and a decryption key used for decryption ;
A server window display processing unit for displaying a server window, which is a window for displaying an icon corresponding to data stored in the server-side storage unit, by the display unit;
An encryption processing unit for encrypting data using the encryption key;
A decryption processing unit for decrypting data using the decryption key;
Data corresponding to the dragged and dropped icon is received based on the fact that the first operation, which is an operation of dragging and dropping the icon displayed outside the server window by the operation unit to the server window, is accepted. A transmission processing unit that performs encryption processing by the encryption processing unit, transmits the encrypted data to the server device, and stores the data in the server-side storage unit ;
Data corresponding to the dragged and dropped icon is received based on the fact that a second operation, which is an operation in which the icon displayed on the server window by the operation unit is dragged and dropped outside the server window, is accepted. Functions as a reception processing unit that executes a reception process of causing the server device to read and transmit the data from the server-side storage unit, and decoding the transmitted data by the decoding processing unit and storing the data in the data storage unit Let
The data includes attribute information indicating processing to be performed on the data,
Furthermore, when a third operation, which is an operation for instructing execution of processing using data corresponding to the icon displayed on the server window, is received by the operation unit, the icon is displayed. Corresponding data is read from the server-side storage unit by the server device and transmitted, the transmitted data is decrypted by the decryption processing unit, and the attribute information included in the decrypted data is included in the attribute information. The communication terminal device is caused to function as an execution processing unit that executes the corresponding processing on the decrypted data,
The communication program in which the third operation is a double click or a tap operation . A server device for storing and reading data with respect to a server-side storage unit for storing data is connected to the server device via a network so that data can be transmitted and received, a display unit for displaying images, and an operation unit for receiving user operations A communication terminal device that is a computer equipped with
A data storage unit for storing data;
An encryption key storage unit for storing an encryption key used for encryption and a decryption key used for decryption ;
A server window display processing unit for displaying a server window, which is a window for displaying an icon corresponding to data stored in the server-side storage unit, by the display unit;
An encryption processing unit for encrypting data using the encryption key;
A decryption processing unit for decrypting data using the decryption key;
Data corresponding to the dragged and dropped icon is received based on the fact that the first operation, which is an operation of dragging and dropping the icon displayed outside the server window by the operation unit to the server window, is accepted. Encrypted by the encryption processing unit, functioning as a transmission processing unit that executes transmission processing to transmit the encrypted data to the server device and store in the server-side storage unit,
The communication terminal devices are grouped into one or more groups among a plurality of groups,
The encryption key storage unit stores the encryption key in association with one or more groups to which the terminal belongs, and stores the decryption key in association with one or more groups to which the terminal belongs;
The encryption keys corresponding to the same group stored in the encryption key storage unit of the communication terminal device are mutually equivalent encryption keys, and the decryption keys corresponding to the same group are mutually equal decryption keys,
The server window display processing unit causes the display unit to display one or a plurality of the server windows respectively corresponding to the one or a plurality of groups to which the terminal belongs.
Further, when a plurality of server windows are displayed by the display unit, an icon displayed on any one of the plurality of server windows by the operation unit is a server different from any one of the server windows. When a fourth operation, which is an operation that is dragged and dropped onto a window, is received, the data corresponding to the dragged and dropped icon is read from the server-side storage unit by the server device and transmitted. Receiving the decryption key corresponding to the group corresponding to the server window of the drop and drop from the encryption key storage unit, and decrypting the transmitted data by the decryption processing unit based on the acquired decryption key A processing unit;
An encryption key corresponding to the group corresponding to the other server window is acquired from the encryption key storage unit, and the decrypted data is encrypted by the encryption processing unit based on the acquired encryption key, communication program to function the communication terminal device as a transmission processing unit to be stored in the server-side storage unit to the corresponding encrypted data to the group corresponding to the different server window and transmitted to the server device. A server device for storing and reading data with respect to a server-side storage unit for storing data is connected to the server device via a network so that data can be transmitted and received, a display unit for displaying images, and an operation unit for receiving user operations A communication terminal device that is a computer equipped with
A data storage unit for storing data;
An encryption key storage unit for storing an encryption key used for encryption and a decryption key used for decryption ;
A server window display processing unit for displaying a server window, which is a window for displaying an icon corresponding to data stored in the server-side storage unit, by the display unit;
An encryption processing unit for encrypting data using the encryption key;
A decryption processing unit for decrypting data using the decryption key;
Data corresponding to the dragged and dropped icon is received based on the fact that the first operation, which is an operation of dragging and dropping the icon displayed outside the server window by the operation unit to the server window, is accepted. Encrypted by the encryption processing unit, functioning as a transmission processing unit that executes transmission processing to transmit the encrypted data to the server device and store in the server-side storage unit ,
The communication terminal devices are grouped into one or more groups among a plurality of groups,
The encryption key storage unit stores the encryption key in association with one or more groups to which the terminal belongs, and stores the decryption key in association with one or more groups to which the terminal belongs;
The encryption keys corresponding to the same group stored in the encryption key storage unit are mutually equivalent encryption keys, and the decryption keys corresponding to the same group are mutually equivalent decryption keys,
The server window display processing unit causes the display unit to display one or a plurality of the server windows respectively corresponding to the one or a plurality of groups to which the terminal belongs.
Further, a message window in which a user can write a message is displayed by the display unit corresponding to each of the server windows displayed by the server window display processing unit, and the message written in the message window is displayed in the message window. Using the encryption key corresponding to the target group that is a group corresponding to the server window corresponding to the window, the encryption processing unit encrypts the encrypted message and transmits the encrypted message to the server device as an encrypted message. The communication terminal device functions as a message processing unit,
The message processing unit, when receiving the encrypted message from the server device, causes the decryption processing unit to decrypt the decrypted message using the decryption key corresponding to the target group, and the decrypted message to the target A communication program to be displayed in the message window corresponding to a group . A server device for storing and reading data with respect to a server-side storage unit for storing data is connected to the server device via a network so that data can be transmitted and received, a display unit for displaying images, and an operation unit for receiving user operations A communication terminal device that is a computer equipped with
A data storage unit for storing data;
An encryption key storage unit for storing an encryption key used for encryption and a decryption key used for decryption ;
A server window display processing unit for displaying a server window, which is a window for displaying an icon corresponding to data stored in the server-side storage unit, by the display unit;
An encryption processing unit for encrypting data using the encryption key;
Function as a decryption processing unit for decrypting data using the decryption key;
The server device includes a first server device and a second server device,
The server window display processing unit causes the display unit to display the server window corresponding to the first server device and the second server device,
Furthermore, when the operation unit accepts an operation for dragging and dropping an icon displayed in the server window corresponding to the first server device to the server window corresponding to the second server device, the drag and drop operation is performed. A reception processing unit that causes the data corresponding to the dropped icon to be transmitted from the first server device, and that the transmitted data is decrypted by the decryption processing unit based on the decryption key;
The decrypted data is encrypted based on the encryption key by the encryption processing unit, and the encrypted data is transmitted to the second server device and stored in the server-side storage unit of the second server device A communication program for causing the communication terminal device to function as a transmission processing unit .

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