JP4573457B2 - Document management system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a system for managing documents between a plurality of terminals connected to a communication network.
[0002]
[Prior art]
With the development of communication network technology, document management is frequently performed between a plurality of terminals connected to a communication network.
[0003]
As a form of document management, for example, a document management service or the like collects documents from users and manages them on a server, and uses the documents when the users need them. is there. In this case, security measures for documents stored on the server are required. That is, it is necessary to prevent a document stored on the server from being illegally accessed by a third party via a communication network and not to be read by the server provider.
[0004]
Another form of document management is to collect documents from the contributors of an unspecified number of documents once on the server, such as recruiting papers to be published in academic journals and journals. Some use the documents collected above. In this case, it is necessary to unify the document layout. In other words, if the layout of the submitted document is different from that specified in the published academic journal, etc., the layout of the posted document must be converted. If there are many posted documents, the layout conversion The work burden increases.
[0005]
As a security measure for the document on the server, there is a method of encrypting the document on the server.
Japanese Patent Laid-Open No. 9-233067 discloses that a document is divided into blocks and encryption is performed according to the confidential level of the document by using an encryption technique according to the confidential level of each block. An intelligent information processing method and apparatus are disclosed.
[0006]
On the other hand, in order to unify the layout of documents posted on the server, the layout information is provided to the document creator in advance, and the document creator creates a document based on the information, and the creation There is a method of converting the layout of a document collected from a user into a prescribed layout.
Japanese Laid-Open Patent Publication No. 2000-99507 discloses a standard document creation apparatus, a method thereof, and a control program thereof that can select a target document pattern according to a creation purpose and a destination from among document patterns prepared in advance. A recorded recording medium is disclosed.
Japanese Patent Laid-Open No. 5-6366 discloses a document processing method for reading an existing document original with a scanner or the like, automatically extracting document layout data, and creating the same document data as the read original. An apparatus is disclosed.
[0007]
[Problems to be solved by the invention]
However, in the method disclosed in Japanese Patent Laid-Open No. 9-233067, in which a document is divided into blocks and different encryption methods are used for the respective blocks, the user performs the encryption work. large. In addition, encryption method information corresponding to all confidential levels must be held on the client side, and the processing burden on the client regarding encryption and decryption processing is large.
[0008]
On the other hand, in the document processing method based on automatically extracted layout data disclosed in Japanese Patent Laid-Open No. 5-6366, the layout must be set for a document created by the creator himself.
In the method disclosed in Japanese Patent Laid-Open No. 2000-99507 for selecting a standard document from among a plurality of document patterns, the creator must acquire the document pattern.
[0009]
The present invention has been made to solve the above-described problems of the prior art, and does not impose a load on the user who registers or browses the document, and in an appropriate method and place according to the confidential level of the document. An object of the present invention is to provide a document management system that can reduce the burden on the client by performing encryption processing.
In addition, the creator of the document can create the document by any means without worrying about the layout of the document, and the recruiter of the document collecting the created document himself converts the layout of the collected document. An object of the present invention is to provide a document management system that does not need to be performed.
[0010]
[Means for Solving the Problems]
The invention according to claim 1 is a system for managing a document between a plurality of terminals connected to a communication network, comprising a document management client and a document management server, wherein the document management client is a document and the document management server. Means for inputting a document secret level and an ID for identifying the document; means for encrypting the document in accordance with the secret level; means for transmitting a plaintext or encrypted document of the document to the document management server Means for receiving a plaintext or encrypted document of the document from the document management server, means for decrypting the encrypted document, and means for displaying the plaintext of the document or the decrypted document. The document management server receives a plain text or an encrypted document of the document transmitted by the document management client; Means for encrypting the plaintext of the received document according to the confidentiality level; means for storing the document encrypted by the encryption means or the encrypted document received from the document management client; Means for decrypting the encrypted document according to the security level, and means for transmitting the decrypted document or the encrypted document received from the document management client to the document management client. And
[0011]
The invention described in claim 2 is characterized in that, in the invention described in claim 1, the encryption of the document input from the document management client is based on an encryption method corresponding to the confidential level.
[0012]
The invention described in claim 3 is the invention described in claim 1 or 2, wherein the document management server encrypts the document using a key generated by the document management client.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of a document management system according to the present invention will be described with reference to the drawings.
[0017]
FIG. 1 is a block diagram showing an embodiment of a document management system according to the present invention (hereinafter referred to as “the present system” in the present embodiment). This system includes a document management client 20 and a document management server 30 connected to a communication network (not shown). Examples of communication networks include computer networks such as a LAN and the Internet.
This system encrypts a document input from the document management client 20 and stores it in the document management server 30. The encryption is performed according to the confidentiality level of the document to be stored. Alternatively, it is performed by the document management server 30.
[0018]
The document management client 20 includes therein input means 11, display means 12, client key management means 21, key generation means 22, client encryption means 23, and client decryption means 24.
[0019]
The input unit 11 receives input from a user such as a document, a bibliographic item of the document, and a document browsing instruction.
[0020]
The display unit 12 displays the document in the document management server 30 that the user has instructed to browse.
[0021]
The client key management unit 21 manages the encryption key used in the document management client 20 and provides an appropriate key to the client encryption unit 23 and the client decryption unit 24 according to the document.
[0022]
The key generation unit 22 generates an encryption key and a decryption key, and registers the generated key in the client key management unit 21 or the server key management unit 31.
[0023]
The client encryption unit 23 encrypts the document received from the user.
[0024]
The client decryption unit 24 decrypts the encrypted document received from the document management server 30.
[0025]
The document management server 30 includes therein a server key management unit 31, a server encryption unit 32, a document registration unit 33, a document database 34, a server decryption unit 35, and a document browsing unit 36.
[0026]
The server encryption key management unit 31 manages the encryption key and provides an appropriate key to the server encryption unit 32 and the server decryption unit 35 according to a document.
[0027]
The server encryption unit 32 encrypts the document received from the document management client 20.
[0028]
The document registration unit 33 registers the encrypted document in the document database 34.
[0029]
The document database 34 stores documents and bibliographic items attached to the documents in association with each other.
[0030]
The server decrypting means 35 decrypts the document received from the document database 34.
[0031]
The document browsing means 36 acquires a document designated by the user from the document database 34.
[0032]
Hereinafter, the operation of this system when a user who uses the document management server 30 using the document management client 20 registers a created document in the document management server 30, and the document in which the user is registered in the document management server 30. The operation of this system when browsing is described. The operation of this system when generating keys (encryption key and decryption key) will also be described.
[0033]
The operation of this system when a user registers a document will be described. FIG. 2 is a flowchart of document registration.
[0034]
The user uses the document input unit 11 to create a document to be registered in the document management server 30, and at the same time, sets the confidential level of the document as part of the bibliographic items of the created document (S1). Here, the security level is defined in four stages from “1” to “4”. The secret level is “1” is the lowest and “4” is the highest. The secret level is not limited to four levels, and may be appropriately defined according to the application.
The user selects an appropriate security level from the four security levels and sets it as the document security level.
FIG. 4A shows an example of a document with a confidential level “2” created by the user A (document 1), and FIG. 4B shows an example of a document with a confidential level “4” created by the user A (document 2). FIG.
[0035]
A document is composed of a text and a bibliographic item, and the bibliographic item includes a creator, a confidential level, and an encryption flag. The encryption flag is set to OFF at the time of document creation. These pieces of information are not encrypted.
[0036]
The document management client 20 obtains a document to be registered from the document input unit 11.
The client key management unit 21 acquires the creator of the document and the confidential level of the document from the bibliographic items attached to the document, searches for the corresponding encryption key, and passes it to the client encryption unit 23 (S2).
If the client key management unit 21 has a key management table as shown in FIG. 5 for the user A, the key is passed to the client encryption unit 23 because there is no corresponding encryption key for the document 1. Not.
For the document 2, the key “E4” is passed to the client encryption unit 23.
[0037]
Upon receiving the key, the client encryption unit 23 encrypts the document, turns on the encryption flag of the encrypted document, and passes it to the document management server 30 (S3).
If no key is delivered from the client key management unit 21, the document is delivered to the document management server 30 without performing encryption processing.
[0038]
As described above, the document 1 remains plain and the document 2 is encrypted with the key “E4”. After the encryption flag is turned ON, the document 1 is passed to the document management server 30.
[0039]
If the encryption flag of the document delivered from the document management client 20 is ON, the server key management unit 31 passes the document to the document registration unit 33 as it is.
When the document encryption flag is OFF, the document creator and the confidential level are acquired, and the corresponding encryption key is retrieved and passed to the server encryption unit 32 (S4).
When the server key management unit 31 has a key management table for the user A shown in FIG. 6, the encryption key “02” is transferred to the server encryption unit 32 for the document 1.
[0040]
The server encryption unit 32 encrypts the document with the received key, sets the document encryption flag to ON, and passes the document to the document registration unit 33 (S5).
[0041]
The document registration means 33 adds a unique ID (document ID) in the document database 34 for identifying the document to the received document and passes it to the document database 34 (S6).
[0042]
The document database 34 stores the delivered document (S7).
[0043]
As described above, the document input from the document management client 20 is encrypted with an appropriate encryption method at an appropriate timing according to the confidentiality level set by the creator of the document, and is registered in the document management server 30. .
[0044]
Next, the operation of this system when the user browses a document will be described. FIG. 3 is a flowchart of document browsing.
[0045]
The user designates a document ID to be browsed using the input means 11 (S8). As a result, the document ID is passed from the document management client 20 to the document management server 30 via the communication network.
[0046]
The document management server 30 receives the document ID, and the document browsing means 36 takes out the document designated by the ID from the document database 34 (S9).
[0047]
The server key management means 31 passes the decryption key corresponding to the creator of the extracted document from the confidential level to the server decryption means 35 (S10).
[0048]
When the extracted document is document 1, the server key management unit 31 passes the decryption key “02” from the key management table of FIG. 6 to the server decryption unit 35.
In the case of the document 2, since the corresponding key does not exist, the key is not passed to the server decryption means 35.
[0049]
The server decrypting means 35 decrypts the document when the key is delivered, turns off the encryption flag, and delivers the decrypted document to the document management client 20 (S11). If the key is not passed, the document is passed to the document management client 20 without being decrypted.
That is, the document 1 is decrypted using the key “02”, and the encryption flag is turned OFF. Further, the document 2 is transferred to the document management client 20 as it is.
[0050]
When the encryption flag of the document received from the document management server 30 is OFF, the client key management unit 21 passes the document to the document display unit 12 as it is. If the document encryption flag is ON, the decryption key corresponding to the creator and the confidential level is transferred to the client decryption means 24 (S12).
That is, since the document 1 has already been decrypted, it is transferred to the document display means 12 as it is. For the document 2, the key “D4” is passed to the client decryption means 24 from the key management table of FIG.
[0051]
The client decryption means 24 decrypts the document using the passed key and passes it to the document display means 12 (S13).
[0052]
The document display unit 12 displays the plain text document (S14).
[0053]
As described above, the document browsed by the user is decrypted using the key corresponding to the document management server 30 or the document management client 20, and is displayed on the document display unit 12 as plain text.
[0054]
Next, the operation of this system when generating a key will be described.
[0055]
The user instructs generation of a key from the input means 11. At that time, specify your user name (creator) and the confidentiality level you want to create.
The key generation unit 22 acquires a key generation command, creator, and confidential level information from the user, and generates an encryption key and a decryption key based on an appropriate encryption method.
The key generation unit 22 passes the generated key to the client key management unit 21 or the server key management unit 31.
Upon receiving the key, the client key management unit 21 and the server key management unit 31 manage the key, the creator of the key, and the secret level of the key in association with each other.
[0056]
According to the embodiment described above, since the document stored in the document management server 30 is encrypted according to the confidentiality level, it is not necessary to perform encryption processing on all documents on the document management client 20, and document management. The load on the client 20 can be reduced.
[0057]
For document encryption, the document management client 20 or the document management server 30 automatically determines the encryption / decryption timing and the encryption method to be used according to the confidential level of the document specified when the document is created. Therefore, the user only needs to specify the confidential level, and the burden on the user for encrypting and decrypting the document can be reduced.
[0058]
Here, when the asymmetric public key cryptosystem is adopted, only the public key is placed on the document management server 30 and the secret key is managed by the document management client 20, so that the confidentiality can be further increased and free. Document registration is possible.
[0059]
In the embodiment described above, some means of the document management client 20 may be provided in another terminal.
FIG. 7 is a block diagram showing an embodiment of the document management system according to the present invention in which the means of the document management client 20 shown in FIG. 1 is separated into the document management client 20 x and the terminal 10. The terminal 10 includes an input unit 11 and a document display unit 12. Further, the document management client 20 x includes client key management means 21, key generation means 22, client encryption means 23, and client decryption means 24.
[0060]
In the embodiment shown in FIG. 7, the user can register, view, and generate a key using a simple terminal 10 having the input unit 11 and the document display unit 12.
Further, if the document management server 30 is used from a plurality of user terminals via the document management client 20x, the number of document management clients 20x can be adjusted as appropriate according to the number of users or the usage frequency. The management client 20x can be used efficiently.
[0061]
Next, another embodiment of the document management system according to the present invention (hereinafter referred to as “the present system” in the present embodiment) will be described.
This system collects document layout information in advance from a document recruiter, changes the document transmitted by the document creator based on the layout information, and transmits the document to the recruiter.
[0062]
FIG. 8 is a system configuration diagram showing an embodiment of a document management system according to the present embodiment. This system includes a creator client 40, a recruiter client 50, and a document posting server 60 connected to a communication network 70.
Examples of the communication network 70 include computer networks such as a LAN and the Internet. The creator client 40, the recruiter client 50, and the document posting server 60 are connected to the communication network 70 via communication lines 74, 75, and 76, respectively.
The creator client 40 and the recruiter client 50 connect to the document posting server 60 by browsing a WEB page in the document posting server 60 using a WWW browser.
[0063]
The creator client 40 includes an input device 41, an output device 42, a computer 43, and a storage device 44.
[0064]
The recruiter client 50 includes an input device 51, an output device 52, a computer 53, and a storage device 54.
The storage device 54 is a device that accumulates a program executed by the computer 53 and a large amount of data, and uses a magnetic disk, a semiconductor memory, or the like.
[0065]
The document posting server 60 includes a document layout conversion unit 61, an item confirmation unit 62, a document editing unit 63, a recruiter database (DB) 64, a creator database (DB) 65, a document database (DB) 66, an input device 67, and an output. It has a device 68.
[0066]
The input devices 41, 51, and 67 are devices for inputting information, and include a pointing device such as a keyboard and a mouse.
The output devices 42, 52, and 68 are devices that display information, such as a display and a printer.
[0067]
The following describes the operation of this system when a recruiter solicits a document, when a creator obtains recruitment information and submits a document, and when a solicitor obtains a document posted by the creator. .
[0068]
First, the operation of this system when a document recruiter recruits documents will be described. FIG. 9 is a flowchart of document recruitment.
[0069]
A recruiter who wants to recruit documents connects to the document posting server 60 from the recruiter client 50. The recruiter is requested by the document posting server 60 to input the solicitor ID on the screen of the recruiter client 50.
[0070]
If the recruiter has not obtained a recruiter ID, or if it has been obtained but wants to change the registration details, the recruiter name, location (address), phone number on the recruiter registration screen shown in Figure 11 as an example The information for identifying the recruiter, such as the representative name and the activity content, is input (T1).
[0071]
When the necessary information is entered and the registration application button on the recruiter registration screen is pressed, a unique recruiter ID is issued (T2) in this system from the recruiter management means (not shown) in the document posting server 60, and FIG. A document recruitment registration screen showing an example is displayed.
[0072]
The recruiter management means accumulates information registered from the recruiter client 50 in the recruiter DB 64.
[0073]
When the recruiter has already obtained the recruiter ID, when the recruiter inputs the recruiter ID, the document recruitment registration screen is displayed.
[0074]
The recruiter inputs the document recruitment title, the recruitment outline, the recruitment period, and the recruitment content on the document recruitment registration screen (T3).
At this time, if the document layout is registered in the recruiter DB 64, the layout name is displayed on the screen. The recruiter selects a corresponding layout from the list (T5).
[0075]
When the recruiter has not registered the document layout or uses a new document layout, when the layout registration button is pressed from the document recruitment registration screen, a layout registration screen shown in FIG. 13 is displayed.
On the layout registration screen, the recruiter can specify the layout of the document to be recruited, such as the top / bottom / left / right margins, the size of the characters, the width of the line, etc. By sending the document file described in the above, the layout of the document to be recruited is determined.
At that time, as shown in FIG. 13, when a setting item is designated as a range, the document creator can adjust the document layout of the document he / she created within this range.
[0076]
The document posting server 60 uses the document layout conversion means 61 to analyze the layout information received from the recruiter client 50 or the information of the transmitted file, create layout information designated by the recruiter, and Displayed on the operator client 50.
[0077]
The recruiter confirms the displayed layout information, corrects it if necessary, and registers it with a name. The registered document layout is stored in the recruiter DB 64 (T4).
[0078]
When all the recruitment information including the document layout is entered, the recruiter presses the recruitment registration button from the recruiter client 50.
The recruiter management means accumulates the registered layout information and other document recruitment information in the recruiter DB 64 (T6).
[0079]
As described above, the document recruiter can register the recruitment information from the recruiter client 50 in the document posting server 60.
[0080]
Next, the operation of this system when the creator obtains recruitment information and submits a document will be described. FIG. 10 is a flowchart of document submission.
[0081]
The creator connects to the document posting server 60 from the creator client 40. The document posting server 60 searches the recruiter DB 64 using the recruiter management means, and displays the recruitment list screen on the creator client 40 based on the information of the recruiters who are currently recruiting documents (T7). .
On the recruitment list screen, it is also possible to limit the recruitment to be displayed by field or keyword.
[0082]
When the creator selects a recruiter who wants to post a document from the recruitment list screen, the recruiter management means searches the recruiter DB 64 and displays the recruitment detail screen shown in FIG. To do. On the recruitment detail screen, detailed contents of the recruitment summary and information about the recruiter of the document are displayed (T8).
[0083]
When the document submission button on the recruitment detail screen is pressed, a creator ID input screen is displayed.
[0084]
If the creator has not obtained the creator ID, or has been obtained but the registered content is changed, in addition to the creator information embedded in the document from the creator registration screen shown in FIG. Then, information necessary for submitting documents such as contact information, a password for using the creator ID, etc. are input (T9). Here, the creator registration screen is displayed on the creator client 40 when the creator registration application button displayed on the creator ID input screen is pressed.
[0085]
When the registration button on the creator registration screen is pressed, creator registration is performed by the creator management means, and a creator ID is issued (T10).
[0086]
The registered creator information is accumulated in the creator DB 65.
[0087]
When the creator ID is acquired or the creator ID is entered on the creator ID input screen, a document posting screen shown in FIG. 16 is displayed. On the document submission screen, a part for designating a document file to be submitted and a field for directly inputting the contents of the document are displayed.
[0088]
The creator creates a document and posts it (T11).
In this case, when the creator creates a document using word processing software, text editor, drawing software, or the like, tags for specifying items in the document, such as “<< title >>”, “<< abstract >> A tag such as “>” is inserted, and a document file in which the tag is embedded is designated.
When the creator does not use document creation software, the document is entered in the input field. In FIG. 16, the input field is divided for each input item, so input is made for each item.
[0089]
When the creator finishes inputting the document, the creator presses the document registration button. When the document registration button is pressed, the input information and document are transmitted to the document posting server.
[0090]
In the document posting server 60, the document layout changing unit 61 changes the transmitted document to the layout designated by the document recruiter (T12).
[0091]
The item confirmation unit 62 confirms the document whose layout has been changed by the document layout changing unit 61 and other information registered by the document creator (T13).
[0092]
When the document file is transmitted, the document layout changing unit 61 reads the tag from the document file and divides the document into each item. Thereafter, a laid out document is created according to the document layout information designated by the recruiter.
[0093]
If there is a necessary item that has not been transmitted, the item confirmation unit 62 displays a screen that prompts the creator client 40 to input.
[0094]
The creator inputs the item according to the guidance on the screen and transmits it again.
[0095]
When all necessary items are complete and the document layout conversion is completed, the document management means (not shown) transmits the document after the layout change to the creator client 40 and displays a confirmation screen as shown in FIG.
[0096]
The creator confirms the displayed document, and if it is OK, presses the confirmation end button.
If you want to make corrections, make corrections within the range specified on the confirmation screen. The corrected document is transmitted to the document posting server 60.
[0097]
The creator adjusts the correction instruction on the confirmation screen within a range in which margins, line spacing, and the like can be adjusted on the correction sub-window shown in FIG. 18, and confirms the result on the confirmation screen (T14).
[0098]
Further, the creator can save the displayed document after layout as an image or a file formatted for word processing software. The document management means, when a save request is issued from the creator, converts it into a commonly used document format or image format and provides it.
[0099]
The document management means accumulates the document in the document DB 66 (T15), and notifies the recruiting client 50 that the document has been submitted by e-mail or the like (T16).
[0100]
As described above, the creator searches the recruitment information in the document posting server 60 using the creator client 40 and transmits the document to be posted to the target recruiter to the document posting server 60.
The document posting server 60 changes the layout of the document transmitted from the creator client 40 based on the layout information registered in advance by the recruiter, and saves the document to the recruiter. Notify that there was.
[0101]
Next, the operation of the present system when the recruiter obtains a document posted from the creator will be described.
[0102]
The document recruiter inputs the recruiter ID and password from the recruiter client 50.
[0103]
The recruiter management means obtains information on the recruiter having the inputted recruiter ID from the recruiter DB 64, and displays a recruitment list when a plurality of recruitment is performed simultaneously.
[0104]
When one is selected from the recruitment list, a posted document list is displayed.
When a document is selected from the posted document list, the contents of the document after layout stored in the document DB 66 are displayed. When the save button is pressed, the target document is saved in the recruiter client 50.
[0105]
When an additional information button is pressed from the recruitment list, an additional information setting screen for setting additional information such as a header, a footer, and a page number is displayed.
Select the information to be added on the additional information setting screen, select one or more documents from the posted document list in order, and press the display button. The document management means will add the additional information and follow the order of attachment. Display concatenated documents.
When the save button is pressed, the linked document is saved in the recruiter client 50.
[0106]
As described above, the recruiter browses a plurality of documents stored in the document posting server 60 by using the recruiter client 50 and stores them in the recruiter client 50.
[0107]
According to the embodiment described above, the layout of the document created by the document creator is converted based on the layout information specified by the document recruiter. Can be created.
[0108]
Further, since the document obtained by the document recruiter is converted based on the layout information designated in advance by the recruiter, it is not necessary for the recruiter himself to change the document layout.
[0109]
In addition, the document creator clarifies each item in the document by embedding a keyword in the document. Thereby, the document layout is changed by the keyword regardless of the document creation means.
Furthermore, the document creator can check the necessary items in the document.
Since the document creator can use the same keyword for recruiting different recruiters, the document creator can create a document without considering the posting destination.
[0110]
In addition, since each item for creating a document and an input field are displayed on the screen of the creator client 40, the creator of the document having no document creation means does not miss the necessary items and recruits the document. Can post documents requested by
[0111]
Further, since the document created by the document creator and transmitted to the document posting server 60 is transmitted to the creator client 40 after the layout is converted, the document creator can edit the document created by himself / herself. The final form can be confirmed and amended within the scope required by the document recruiter.
[0112]
In addition, when there is an excess or deficiency in the document transmitted by the document creator, the document posting server 60 requests the creator to correct or recreate the document. Only documents that meet the conditions are saved, and there is no need for the document creator and the document creator to exchange the deficiencies.
[0113]
In addition, since the document creator registers information related to the creator, such as his / her name and affiliation, with the document contributor in advance, it is necessary to add information regarding the creator each time multiple documents are posted. There is no.
[0114]
Further, the document posting server 60 collects a plurality of posted documents for the same recruitment, adds information as a series of documents, and transmits the information to the recruiter client 50, so that the document recruiter can edit the post-recruitment by himself / herself. Without doing so, it is possible to obtain document information including additional information after editing.
[0115]
【The invention's effect】
According to the first aspect of the present invention, the document created by the document management client is encrypted and decrypted by the document management client or the document management server in accordance with the confidentiality level set by the document creator. The burden of encryption and decryption processing can be distributed to both the document management client and the document management server, and therefore the processing burden of encryption and decryption processing of the document management client can be reduced.
In addition, since the document creator only needs to specify the confidential level in order to encrypt the document, there is no burden on the user regarding the encryption processing.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an embodiment of a document management system according to the present invention.
FIG. 2 is a flowchart of document registration in the document management system shown in FIG.
FIG. 3 is a flowchart of document browsing in the document management system shown in FIG. 1;
4 is a diagram showing an example of a document managed by the document management system shown in FIG. 1, in which (a) shows a low confidential level and (b) shows a high confidential level document.
FIG. 5 is a diagram showing an example of data in a key management table held by a client key management unit.
FIG. 6 is a diagram showing an example of data in a key management table possessed by server key management means.
7 is a block diagram showing an embodiment of a document management system according to the present invention when a part of the means of the document management client shown in FIG. 1 is separated into another terminal.
FIG. 8 is a system configuration diagram showing another embodiment of the document management system according to the present invention.
9 is a flowchart of document recruitment in the document management system shown in FIG.
10 is a flowchart of document submission in the document management system shown in FIG.
11 is a diagram showing an example of a recruiter registration screen of the document management system shown in FIG. 8. FIG.
12 is a diagram showing an example of a document recruitment registration screen of the document management system shown in FIG. 8. FIG.
13 is a diagram showing an example of a layout registration screen of the document management system shown in FIG.
14 is a diagram showing an example of a recruitment detail screen of the document management system shown in FIG.
15 is a diagram showing an example of a creator registration screen of the document management system shown in FIG.
16 is a diagram showing an example of a document posting screen of the document management system shown in FIG.
17 is a diagram showing an example of a confirmation screen of the document management system shown in FIG.
18 is a diagram showing an example of a correction screen of the document management system shown in FIG.
[Explanation of symbols]
10 terminals
20 Document management client
30 Document management server
40 Creator Client
50 recruitment clients
60 Document submission server
70 Communication network

Claims (3)

A system for managing documents between a plurality of terminals connected to a communication network,
It consists of a document management client and a document management server.
Means for inputting a document, a confidential level of the document, an ID for identifying the document, a means for encrypting the document in accordance with the confidential level, and a plaintext or encrypted document of the document; Means for transmitting to the document management server, means for receiving the plaintext or encrypted document of the document from the document management server, means for decrypting the encrypted document, and plaintext or decryption of the document Means for displaying
Means for receiving a plaintext or encrypted document of the document transmitted by the document management client; means for encrypting the plaintext of the received document according to the security level; and Means for storing the encrypted document received from the document management client, means for decrypting the stored document according to the security level, the decrypted document or the A document management system comprising: means for transmitting an encrypted document received from a document management client to the document management client.   The document management system according to claim 1, wherein the encryption of the document input from the document management client is performed by an encryption method according to a confidentiality level.   3. The document management system according to claim 1, wherein the document management server encrypts the document using a key generated by the document management client.

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