JP2008097302A - File management server, program thereof and file management method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make it possible to register a file in a file management server by transmitting data acquired at a remote place by electronic mail. <P>SOLUTION: A file management server for managing the file on a network is provided with a file management table for registering the attachment file of received electronic mail and the time stamp data. When the attachment file of the electronic mail from the user are an already registered file, the verification of the file is operated by using the registered time stamp data. The file whose original copy should be assured is attached to electronic mail so that it is possible to verify the file by a simple method. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a file management server connected to a network, a program thereof, and a file management method, and more particularly to file management for storing an attached file of an electronic mail and guaranteeing originality.

It is known that an apparatus for storing an e-mail document guarantees the originality of the e-mail document and its attached file (Patent Document 1). However, in this apparatus, it is necessary to distribute a program for creating a signature, verifying, creating a key, and the like to clients. In particular, it is not known that file data of a memory device such as a mobile terminal is sent as an attached file of an e-mail and registered by a simple method to guarantee originality.
JP 2005-101883 A

It is an object of the present invention to provide a file management server for managing a file by attaching a time stamp to an attached file of an electronic mail and guaranteeing the originality (claims 1 to 7).
An additional object of the present invention is to make it possible to remotely retrieve the time stamp data of an attached file using electronic mail (claim 3).

  The present invention provides a file management server for managing files on a network, transmission / reception means for transmitting / receiving e-mail, and time for acquiring time stamp data for the attached file of the received e-mail Stamp data acquisition means, registration means for registering the attached file in the file management table in association with the time stamp data acquired by the time stamp data acquisition means, and registration in the file management table by e-mail And a notification means for notifying (claim 1).

  Preferably, when detecting that the attached file of the received e-mail is registered in the file management table and detecting that the attached file is a registered file, Verification means for obtaining time stamp data to be obtained from the file management table and verifying whether or not the attached file is the same as the registered attached file is provided.

  Preferably, upon receipt of an e-mail requesting retrieval of time stamp data, time stamp data for obtaining the time stamp data of the requested file from the file management table and returning the obtained time stamp data by e-mail. Transmission means is provided (Claim 3).

  Further, the present invention provides a file management server program for managing files on a network with transmission / reception of electronic mail, comprising: an instruction for acquiring time stamp data for the attached file of the received electronic mail; A command for registering the attached file in a file management table in association with the time stamp data acquired by the time stamp data acquisition means, and a command for notifying registration in the file management table by e-mail; (Claim 4).

  Preferably, an instruction for detecting whether or not the attached file of the received e-mail is registered in the file management table corresponds to when detecting that the attached file is a registered file. An instruction for obtaining time stamp data from the file management table and verifying whether or not the attached file is the same as the registered attached file is provided.

  The present invention is also a method for managing a file on a network using a file management server, the step for performing transmission / reception of an e-mail, and time stamp data for the attached file of the received e-mail A step for registering the attached file in the file management table in association with the time stamp data acquired by the time stamp data acquiring means, and an e-mail for registration in the file management table And a step for notifying with (6).

  More preferably, a step for detecting whether or not the attached file of the received e-mail is registered in the file management table corresponds to a step of detecting that the attached file is a registered file. A step for obtaining time stamp data from the file management table and verifying whether or not the attached file is the same as the registered attached file.

  In the present invention, the attached file of the received e-mail is registered in the file management table in association with the time stamp data and managed centrally. In particular, when file data of a memory device such as a mobile terminal device is transmitted as an attached file of an e-mail, it is possible to easily guarantee the original data from a remote place, for example, for data obtained at a place where the user is away. Therefore, it is possible to facilitate the guarantee of the original of file data from, for example, a mobile terminal device that does not include an application for generating or verifying time stamp data (claims 1 to 7).

  Furthermore, in the present invention, by transmitting the acquired file data by e-mail, if the file data has already been registered, it is possible to verify whether editing / tampering has been performed. 7).

  In the present invention, since the time stamp data can be taken out using an electronic mail, the time stamp data can be obtained from a mobile terminal device or the like.

  In the following, an optimum embodiment for carrying out the invention will be shown.

  1 to 5 show an embodiment. FIG. 1 shows the relationship between the configuration of the file management server 2 and the time stamp server 4 or the like. In the embodiment, a file management server as a single device will be described. However, the file management server may be incorporated in an Internet facsimile machine or the like. The file management server 2 is connected to the mobile terminal device 7 of the client, the personal computer 8, the router 10 and the like via the LAN 6, and further connected to the Internet 12 via the router 10 and the mail server 11 to send and receive e-mails and the like. Do. Then, it is connected to other personal computers 14 and the time stamp server 4 through the Internet 12.

  In FIG. 1, a time stamp server 4 is a server as a third party that provides a time stamping service. The time stamp server 4 assigns an electronic signature to file data from the file management server 2, that is, a hash value of the file data, a server name, time information, etc., and acquires time stamp data. Time stamp data is acquired by returning to.

  In the file management server 2 according to the embodiment, an attached file of an e-mail is managed as a received file, and the file data is, for example, image data acquired by a portable memory device such as a digital camera in addition to a document created by a personal computer. . In the figure, 20 is a main control unit, 22 is a LAN interface, and 24 is an e-mail transmission / reception unit from the mobile terminal device 7 or the client personal computer 8. The RAM 26 stores a file folder for saving the file, its time stamp data, and other data. The ROM 28 stores a program necessary for the file management server 2, particularly acquires time stamp data of an attached file, registers a file to be stored and time stamp data in association with each other in a table, and attaches an e-mail attached file. A file management program 60 necessary for guaranteeing the original and detecting file editing / tampering is stored.

  30 is a message digest generation unit for generating a message digest of file data, and 32 is a time for acquiring the time stamp data from the time stamp server 4 or the like for the generated message digest and giving the time stamp. It is a stamp data acquisition unit. A file registration unit 34 registers the received file and the acquired time stamp data in the file management table 36 in association with each other. When registration in the file management table is completed, a registration completion notification is sent to the client by e-mail.

  In the embodiment, the time stamp data is acquired from the time stamp server 4, but the time stamp data may be generated for the data of the electronic file by itself without using the time stamp server 4. In this case, a standard time information acquisition unit is provided instead of the time stamp data acquisition unit 32, and only the time information is obtained from an external server or a server in the LAN 6, and a message digest is generated for the character data and the time information. Generated by the unit 30. Alternatively, the time information of the own device is used and a message digest is generated for these. In addition, a time stamp may be easily given using the own machine or a server in the LAN 6.

  Reference numeral 40 denotes a registered file verification unit. If a file received as an attached file has already been registered in the file management table 36, a hash value (message digest) of the file is obtained, and a hash included in the corresponding time stamp data The value is compared to detect the presence or absence of falsification and the like, and the verification result is returned in an e-mail format. When tampering is detected, the file restoration processing unit 42 obtains the file before tampering from the file management table 60 and returns it to the client as an attached file of the e-mail.

  A data request processing unit 44 designates a file name by e-mail and if there is a request to read the time stamp data, obtains the corresponding time stamp data from the file management table 36 and attaches it to the e-mail to the client. Send. An e-mail creation unit 46 is an e-mail for notifying completion of registration of an attached file, an e-mail for returning a correct file upon detection of editing / tampering, and an e-mail attached with time stamp data requested by a client Create emails.

  FIG. 2 shows an outline of the file management program 60. The file management program 60 is stored in the file management server 2, manages the received file and its time stamp data with the file management table, and uses the time stamp data registered in advance for the file requested for verification. Verify tampering. Also, the time stamp data requested by the client is transmitted. This program 60 has a command 62 for acquiring the time stamp data of the attached file of the received e-mail from an external server or the like, and a command for registering the attached file and its time stamp data in association with each other in the file management table. 64 and an instruction 66 for verifying editing / tampering with time stamp data if a file for which verification has been requested has already been registered. Further, the program 60 responds to an instruction 68 for restoring the file using the original file upon detection of editing / falsification to the file and a time stamp data retrieval request specifying the file name from the client. An instruction 70 for returning this, and an instruction 72 for creating an e-mail for transmitting registration completion notification and verification result notification, and an e-mail for transmitting time-stamp data requested to be taken out are provided.

  FIG. 3 shows file management processing in the embodiment. In the embodiment, data captured by the mobile terminal device 7 and a document created by the personal computer 8 are transmitted as an attachment file of an electronic mail. The mobile terminal device 7 performs file management on the image data and the like captured in these memory devices by a mobile terminal device, a mobile phone, a digital camera, etc., and guarantees the original. In the figure, the received file “File01” is, for example, a PDF (Portable Document Format) file “File01.pdf” or the like, the time stamp data “TSP.01tsp” is acquired, and the file “File01.pdf” and the time stamp data “ TSP.01tsp ”is registered in the file management table 38 in association with each other.

  FIG. 4 shows the exchange between the file management server 2 and the mobile terminal device 7. When the original data of the file such as image data captured in the mobile terminal device 7 is guaranteed, the captured data is transmitted to the file management server 2 as an attached file in an e-mail format. When the file management server 2 receives the electronic mail with the attached file, the file management server 2 extracts the attached file from the electronic mail, generates a message digest of the file data, and acquires the time stamp data by the time stamp server. The received file and time stamp data are registered in the file management table in association with each other. If the file management server 2 registers the received file, it returns an e-mail indicating registration completion. By receiving the registration completion notification mail, the user can confirm that the transmitted data has been registered.

  Next, if the data received as the attached file of the e-mail has already been registered in the file management table, the file is verified. That is, the user can perform registration and verification by transmitting the data stored in the mobile terminal device 7 as an attached file of an electronic mail. File verification uses time stamp data registered corresponding to the attached file. The verification result is notified to the client by e-mail, but if the editing / falsification of the file is detected, the attached file may be restored. For file restoration, an original file is obtained from the file management table and transmitted to the client to obtain a correct file before editing / falsification.

  Further, the user can take out the time stamp data of a desired file by sending an e-mail requesting the take-out from the mobile terminal device 7 or the like. In the embodiment, since each file name is registered in the file management table in association with the time stamp data, the user can acquire the corresponding time stamp data by designating the file name. In the time stamp data request mail, in addition to the file name, it may be specified by a keyword for specifying the file such as the date and time or the file creator.

  A process for registering and verifying a file will be described with reference to FIG. An e-mail from the authenticated client is received (S1), and if there is an attached file in the e-mail (S2), it is checked with the file name whether the attached file has been registered in the file management table (S3). If the attached file is not registered in the file management table, a hash value of the file data is generated to obtain time stamp data (S4). Then, the attached received file is registered in the file management table in association with the time stamp data (S5), and a notification that the file attached by the user has been registered is transmitted together with the registration date, file name, server name, and the like. An e-mail for this purpose is created (S7). In the setting for transmitting the time stamp data (S7), the time stamp data is transmitted as an attachment file of the e-mail of the registration completion notification (S8, S9).

  If the attached file is already registered in the file management table, the corresponding time stamp data is obtained to determine whether the attached file has been edited / tampered (S3, S10). Are checked (S11). If they match, that is, if there is no editing / tampering, a verification result notification mail for notifying that is created (S12, S16) and sent to the client (S9). In the case of setting to detect editing / tampering and restore the file data, the file data is obtained from the file management table (S14), and the original file data is attached to the e-mail and sent back to the client (S15, S16). , S9). On the other hand, if the setting is not to restore the file data, an edit / falsification detection notification is sent together with the target file name, the date of editing / falsification, etc. (S13, S16, S9). The user can obtain the verification result of the transmitted file, and can acquire the original file data when the file for which the verification is requested is edited / tampered.

  If no file is attached to the received e-mail and the request mail is a time stamp data (S2, S17), the file management table is searched with the file name extracted from the e-mail (S18, S19). Time stamp data is obtained (S20). Then, the obtained time stamp data is transmitted to the client as an attached file of an electronic mail (S20, S21, S9). If no file is attached to the received electronic mail and the request mail is not a time stamp data, other processing is performed (S22).

  As described above, in the embodiment, it is possible to perform original guarantee by registering a file by a simple method for image data of a mobile terminal device or the like acquired on the go, a document file created by a personal computer, or the like. Therefore, it is not necessary to provide an application for generating or verifying time stamp data in a mobile terminal device, etc., and every time a client acquires data, a file can be easily registered from a remote location or the original of a file can be guaranteed. be able to.

The client can register and manage the acquired data and the like together with the time stamp data in the file management server each time. If the file data is already registered in the file management server, it can be verified using the registered time stamp data.
Furthermore, the user can easily extract the time stamp data by specifying a file name or the like by e-mail.

The figure which shows the structure of the file management server of an Example, and the connection with a file management server, a time stamp server, etc. The block diagram which shows the structure of the file management program of the file management server of an Example The figure which shows the processing at the time of file registration with the file management server of execution example The figure which shows the outline of file management in the file management server of execution example The flowchart which shows the file management processing in the file management server of execution example

Explanation of symbols

2 File management server 4 Time stamp server 6 LAN
7 Mobile terminal devices 8 and 14 Personal computer 10 Router 12 Internet network 20 Main control unit 22 LAN interface 24 E-mail transmission / reception unit 26 RAM
28 ROM
30 Message Digest Generation Unit 32 Time Stamp Data Acquisition Unit 34 File Registration Unit 36 File Management Table 40 Registered File Verification Unit 42 File Restore Processing Unit 44 Data Request Processing Unit 46 Email Creation Unit 60 File Management Program

Claims (7)

In the file management server for managing files on the network,
Sending and receiving means for sending and receiving e-mail;
Time stamp data acquisition means for acquiring time stamp data for the attached file of the received e-mail;
A registration unit for registering the attached file in a file management table in association with the time stamp data acquired by the time stamp data acquisition unit;
A file management server comprising notification means for notifying registration to the file management table by e-mail. Detecting means for detecting whether or not the attached file of the received e-mail is registered in the file management table;
When detecting that the attached file is a registered file, a verification unit for obtaining corresponding time stamp data from the file management table and verifying whether the attached file is the same as the registered attached file; The file management server according to claim 1, wherein: Time stamp data transmission means is provided for receiving time-stamp data from the file management table upon receipt of an e-mail requesting retrieval of time-stamp data and returning the obtained time-stamp data by e-mail. The file management server according to claim 2, wherein: A file management server program for managing files on a network with sending and receiving e-mail,
An instruction for obtaining time stamp data for the attached file of the received e-mail;
An instruction for registering the attached file in the file management table in association with the time stamp data acquired by the time stamp data acquiring means;
A file management server program comprising: an instruction for notifying registration in the file management table by e-mail. An instruction for detecting whether the attached file of the received e-mail is registered in the file management table;
A command for verifying whether the attached file is the same as the registered attached file by obtaining corresponding time stamp data from the file management table when detecting that the attached file is a registered file; and The file management server program according to claim 4, wherein: A method for managing files on a network using a file management server,
Steps for sending and receiving e-mail;
Obtaining time stamp data for the received email attachment;
Registering the attached file in a file management table in association with the time stamp data acquired by the time stamp data acquiring means;
A file management method for a file management server, comprising: a step for notifying registration in the file management table by e-mail. Detecting whether the attached file of the received e-mail is registered in the file management table;
If it is detected that the attached file is a registered file, a step for obtaining corresponding time stamp data from the file management table and verifying whether the attached file is the same as the registered attached file; The file management method for a file management server according to claim 6, wherein the file management method is provided.

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