JP4966541B2 - File management system - Google Patents

Description

  The present invention relates to a file management system in which data files are distributed and stored in a plurality of storage areas, and more particularly to a technique for enhancing the security of data files.

Conventionally, a file management system is known in which a data file is divided into a plurality of data file fragments and the data file fragments are distributed and stored in a plurality of storage devices connected to a telecommunication line (see, for example, Patent Document 1). ).
JP 2004-102450 A

  However, the conventional file management system has a configuration in which data files are distributed and stored in storage devices connected to a telecommunication line, and data files can be easily collected by collecting data file fragments from each storage device. Data file security is reduced.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a file management system capable of enhancing the security of data files.

In order to solve the above problems, a file management system according to the present invention is connected to a plurality of electronic devices having a storage area for data in digital form, connected to each other via a telecommunication line, and connected to the telecommunication line, Data files are distributed and stored in storage areas of at least two electronic devices, and data files are recovered by collecting data file fragments stored in the storage areas of each electronic device in response to data file recovery requests. The control device searches for an electronic device that can be detached from the telecommunication line from a plurality of electronic devices, stores a part of the data file fragment in the searched electronic device, and stores the remaining files. fragment to create a file fragment set by dividing the number of predetermined adjacent electronic apparatus, adjacent the file fragment set electronic machine To transfer to.

  According to the file management system of the present invention, since the data file cannot be restored when the terminal device storing the data file fragment is disconnected from the telecommunication line, the security of the data file is improved. Can do.

  The file management system according to the present invention, for example, converts functions of electronic devices connected to a specific network environment such as an equipment network or a home network into objects, and converts the electronic devices into an object base via an electric communication line such as the Internet. The present invention can be applied to a device control system to which EMIT (Embedded Micro Internetworking Technology) technology for controlling and monitoring is applied. Hereinafter, the configuration and operation of a file management system according to an embodiment of the present invention will be described in detail with reference to the drawings.

[File management system configuration]
As shown in FIG. 1, a file management system 1 according to an embodiment of the present invention includes a client terminal device 2 and a control device 3, and the client terminal device 2 and the control device 3 are mutually connected via an electric communication line 4. It is configured to allow information communication. The control device 3 is connected to a field bus 5 to which a plurality of electronic devices 6 such as a desk lamp and an air conditioner are connected, and is configured to be able to control each electronic device 6 via the field bus 5. Yes.

  As shown in FIG. 2, the control device 3 includes a web server 11 that provides a web interface to the client terminal device 2, a device access server 12 that provides an access environment from the client terminal device 2 to the electronic device 6, Service information 13 in which information that can be provided by each electronic device 6 and data information necessary for providing the service is described; a device access controller 14 that controls access from the client terminal device 2 to the electronic device 6; and a communication port A communication module 16 that communicates with the electronic device 6 via 15 is provided.

  As shown in FIG. 2, the electronic device 6 includes an embedded computer 21, and the embedded computer 21 executes various processes in accordance with data input from the input device 23 via the communication port 22a. In addition, an embedded application program 25 that outputs a processing result to the output device 24 via the communication port 22b, a capability table 26 that describes information on characteristics and capabilities of the electronic device 6, and a service that the electronic device 6 can provide A service table 27 on which information is described, an embedded interface module 28 that provides an interface to the embedded computer 21, and a communication module 30 that communicates with the control device 3 via a communication port 29.

In the capability table 26, as shown in Table 1 below, the interface definition (1A), byte array format (1B), device identification (devices detachable from the fieldbus 5) supported by the embedded computer 21 are included. (1C), device address (1D), software version number (1E), communication protocol version number (1F), maximum communication packet size (1G), non-volatile storage The presence / absence of a device (1H), the size and start address (1I) of a nonvolatile storage device, the presence / absence of a static file system (1J), and the presence / absence of a dynamic file system (1K) are described.

In the service table 27, as shown in Table 2 below, the name or identification information of the service provided by the electronic device 6, the type of service (for example, whether it is a function, a variable, an event, or a file) No), input parameter type, return type, and service address.

  The file management system 1 having such a configuration increases the security of the data file by executing the file management process according to the first and second embodiments described below. Hereinafter, the operation of the file management system 1 when executing the file management processing according to the first and second embodiments will be described in detail with reference to the flowcharts shown in FIGS.

[File management processing]

  First, the operation of the file management system 1 when executing the file management process according to the first embodiment of the present invention will be described with reference to FIG.

  The flowchart shown in FIG. 3 starts when a data file distributed storage request is input from the client terminal device 2 to the control device 3 and the control device 3 temporarily stores the data file. The process proceeds to step S1.

  In the process of step S1, the control device 3 generates a redundancy file by multiplying the data file by a redundancy coefficient stored in advance. In the present specification, “redundancy coefficient” means a real number of 1 or more, and a redundant file including the data file r times is generated by multiplying the data file by the redundancy coefficient r. Thereby, the process of step S1 is completed, and the file management process proceeds to the process of step S2.

  In the process of step S2, the control device 3 divides the redundant file generated by the process of step S1 into a plurality of file fragments. The control device 3 randomly sorts the redundant file in units of 1 byte, then divides the redundant file every 32 bytes from the beginning, creates a file fragment, etc. You may make it divide | segment into a file fragment. However, in this case, a table for returning the redundant file to the original state is created. Thereby, the process of step S2 is completed, and the file management process proceeds to the process of step S3.

  In the process of step S <b> 3, the control device 3 refers to the capability table 26 of each electronic device 6 and selects an electronic device 6 that can be detached from the fieldbus 5 from among the plurality of electronic devices 6 connected to the fieldbus 5. Search for. In this specification, “disengagement” means that the connection between the field bus 5 and the electronic device 6 is physically cut off, and that the electronic device 6 is turned off and the field bus 5 and the electronic device 6 are turned off. Any case where the connection between the devices 6 is electrically disconnected is included. Whether or not the electronic device 6 can be detached is a separation coefficient (a real number in the range of 0 to 1) stored in the electronic device 6, and “1” is the electronic device 6 in one day. Is always left, and “0” indicates that there is no time to leave). Thereby, the process of step S3 is completed, and the file management process proceeds to the process of step S4.

  In the process of step S4, the control device 3 distributes and stores the file fragments divided by the process of step S2 in a plurality of electronic apparatuses 6 including at least the electronic apparatus 6 searched by the process of step S3. Thereby, the process of step S4 is completed and a series of file management processes are completed.

  When there is a data file restoration request from the client terminal device 2, the control device 3 collects the file fragments from each electronic device 6, and restores the original file by combining the collected file fragments. However, when the electronic device 6 in which the file fragment is stored is disconnected from the fieldbus 5, the file fragment is insufficient and the original file cannot be restored, so that the security of the data file is improved. Can do.

  Next, the operation of the file management system 1 when executing the file management process according to the second embodiment of the present invention will be described with reference to the flowchart shown in FIG.

  The flowchart shown in FIG. 4 is started when a data file distributed storage request is input from the client terminal device 2 to the control device 3, and the control device 3 temporarily stores the data file. The process proceeds to step S11. In addition, since the process of step S11-13 is the same as the process of said step S1-3, the description is abbreviate | omitted below and only the process after step S14 is demonstrated.

  In the process of step S14, the control device 3 distributes and stores some of the file fragments divided by the process of step S2 in the electronic device 6 searched by the process of step S13. Further, the control device 3 creates the file fragment sets for the number of the adjacent electronic devices 6 by dividing the remaining file fragments into the number of the adjacent electronic devices 6, and sets the created file fragment sets to the adjacent electronic devices. Forward to 6. It is assumed that the adjacent electronic devices 6 are determined in advance for each of the control device 3 and each electronic device 6. Thereby, the process of step S14 is completed, and the file management process proceeds to the process of step S15.

  In the process of step S15, the electronic device 6 stores a storable file fragment among the file fragments constituting the transferred file fragment set. Thereby, the process of step S15 is completed, and the file management process proceeds to the process of step S16.

  In the process of step S16, it is determined whether or not the electronic device 6 has stored all the file fragments constituting the transferred file fragment set. If all the file fragments are stored as a result of the determination, the series of file management processing ends. On the other hand, when not all the file fragments are stored, the electronic device 6 advances the file management process to the process of step S17.

  In the process of step S17, the electronic device 6 determines whether or not the transfer count of the file fragment set is equal to or greater than the maximum transfer count. If it is determined that the number of times of transfer is equal to or greater than the maximum transfer count, the electronic device 6 advances the file management process to the process of step S19. On the other hand, if it is not equal to or greater than the maximum transfer count, the electronic device 6 advances the file management process to the process of step S18. The maximum number of transfers is an integer value given in advance to limit the number of loops that return from the process of step S18 to the process of step S15.

  In step S18, the electronic device 6 creates a set of file fragments corresponding to the number of electronic devices 6 adjacent to the electronic device 6 by dividing the remaining file fragments that could not be stored into the number of electronic devices 6 adjacent to the electronic device 6 itself. Then, the created file fragment set is transferred to the electronic device 6 adjacent thereto. Thereby, the process of step S18 is completed, and the file management process returns to the process of step S15.

  In the process of step S <b> 19, the electronic device 6 transfers the remaining file fragments that could not be stored to the control device 3. Thereby, the process of step S19 is completed, and the file management process proceeds to the process of step 20.

  In the process of step S20, the control device 3 stores the remaining file fragments transferred from the electronic device 6. Thereby, the process of step S20 is completed and a series of file management processes are completed.

  As is apparent from the above description, the file management system 1 according to the embodiment of the present invention includes a plurality of electronic devices 6 having digital data storage areas connected to each other via a field bus 5, and a field bus. 5, data files are distributed and stored in storage areas of at least two or more electronic devices 6, and data file fragments stored in the storage areas of each electronic device 6 are collected in response to a data file restoration request And a control device 3 for restoring the data file. The control device 3 searches the plurality of electronic devices 6 for the electronic device 6 that can be detached from the field bus 5, and among the searched electronic devices 6 The data file fragment is stored in at least one of the above. As a result, since the data file cannot be restored when the electronic device 6 storing the file fragment is detached from the field bus 5, the security of the data file can be improved.

  As mentioned above, although the embodiment to which the invention made by the present inventors was applied has been described, the present invention is not limited by the description and the drawings that form part of the disclosure of the present invention according to this embodiment. That is, it should be added that other embodiments, examples, operation techniques, and the like made by those skilled in the art based on the above embodiments are all included in the scope of the present invention.

It is a schematic diagram which shows the structure of the file management system used as embodiment of this invention. It is a block diagram which shows the internal structure of the control apparatus and electronic device which are shown in FIG. It is a flowchart figure which shows the flow of the file management process used as the 1st Embodiment of this invention. It is a flowchart figure which shows the flow of the file management process used as the 2nd Embodiment of this invention.

Explanation of symbols

1: File management system 2: Client terminal device 3: Control device 4: Telecommunications line 5: Fieldbus 6: Electronic device

Claims (2)

A plurality of electronic devices having storage areas for data in digital form, connected to each other via telecommunication lines;
Data file fragments that are connected to the telecommunication line and that store data files in storage areas of at least two or more electronic devices and that are stored in the storage areas of each electronic device in response to a data file restoration request And a control device for restoring the data file by collecting
The control device searches for an electronic device that can be detached from the telecommunication line from the plurality of electronic devices, stores a part of the data file fragment in the searched electronic device,
Create the remaining fraction file fragment collection of the adjacent electronic devices by dividing the file fragment to the number of predetermined adjacent electronic devices, the transfer of the file fragments set in the adjacent electronic equipment Feature file management system. The file management system according to claim 1,
The control device scrambles the data file, divides the data file into a plurality of data file fragments, and distributes and stores the plurality of data file fragments in the storage area of the adjacent electronic device. Management system.

Images