JP5812805B2 - Document concealment system, document concealment program, and document concealment method - Google Patents

Description

  The present invention relates to a document concealment system, a document concealment device, a document concealment program, and a document concealment method for preventing a document file from being disclosed to an unauthorized user, for example.

  An organization may want to keep a document file secret in order to prevent leakage of trade secrets. Further, there are cases where it is desired to conceal a specific proper noun (person name, organization name, location, device name, system name, project name, mission name, etc.) in the document file.

Conventionally, an administrator assigns a secret level to a document file at his / her discretion by using a function of an OS (operating system) or an application.
Then, access control is performed by comparing the level of authority granted to the user with the level of secrecy assigned to the document file, thereby restricting disclosure of the document file to unauthorized users.

Japanese Patent Application Laid-Open No. 2011-133991

If a secret level that is uncertain by its own subjectivity is given to a document file based on knowledge that each administrator can know, sufficient access control cannot be performed.
In addition, when a specific proper noun (person name, organization name, location, device name, system name, project name, mission name, etc.) in the document file is to be kept secret, the administrator manually handles the proper noun in the document file. It is necessary to turn it down.

  An object of the present invention is, for example, to be able to efficiently conceal a document file.

The document concealment system of the present invention is
A secret word storage unit for storing a secret word to be concealed;
A document file storage unit for storing a document file including a plurality of words;
The word contained in the document file is extracted from the document file stored in the document file storage unit, and a word different from the secret word stored in the secret word storage unit among the extracted words is used as a new secret word. A secret word registration unit to be stored in the secret word storage unit;
A browsing file acquisition unit that acquires a specific document file as a browsing file from the document file storage unit;
A secret file generating unit that generates a secret file by concealing the same word as the secret word stored in the secret word storage unit among the words included in the browse file acquired by the browse file acquisition unit;
A secret file output unit that outputs the secret file generated by the secret file generation unit.

  The concealment file generation unit conceals the word by replacing the same word as the concealment word stored in the concealment word storage unit among the words included in the browsing file with a predetermined concealment notation.

  The secret word registration unit extracts words belonging to a predetermined part of speech from the document file.

  The secret word registration unit extracts at least one of a proper noun and a few nouns from the document file.

  The secret word registration unit extracts a word including a numerical value and a unit from the document file.

The document concealment system further includes:
A disclosure word storage unit for storing disclosed disclosure words;
The secret word registration unit is a word different from the secret word stored in the secret word storage unit and different from the disclosed word stored in the disclosure word storage unit among the words extracted from the document file Is stored in the secret word storage unit as the new secret word.

The secret word storage unit stores a secret type indicating which of the secret word and the browsing file including the secret word to be secreted in association with each secret word,
The secret word registration unit acquires a secret type of the same secret word as the word extracted from the document file among the secret types stored in the secret word storage unit, and any one of the acquired secret types Is stored in the secret word storage unit as a secret type of the new secret word,
The secret file generation unit acquires a secret type of a secret word that is the same as a word included in the browse file among the secret types stored in the secret word storage unit, and each secret word based on the acquired secret type It is determined which of the browsing files is concealed, and the concealment file is generated when it is determined that each concealment word is concealed.

The secret word storage unit stores a secret combination obtained by combining specific secret words,
The secret word registration unit determines whether the document file includes a combination of the same words as a secret combination stored in the secret word storage unit based on a word extracted from the document file, and When it is determined that the same word combination as the secret combination is included in the document file, the new secret word is stored in the secret word storage unit.

The statement Shohi anonymous system further,
A user information storage unit for storing the browsing level given to each user;
A browser level acquisition unit that acquires a browsing level given to a specific user as a browser level from the user information storage unit;
The secret word storage unit stores a specific secret level in association with each secret word,
The secret word registration unit selects, as registered words, the same words as the secret words stored in the secret word storage unit among the words extracted from the document file, and sets a secret level of the selected registered words. Acquired from the word storage unit, and stored in the secret word storage unit as a secret level of the new secret word among any of the acquired secret levels,
The secret file generation unit selects the same word as the secret word stored in the secret word storage unit from the words included in the browsing file, and sets a secret level associated with the same secret word as the selected word. The concealment file obtained from the concealment word storage unit, compares the concealment level acquired with the viewer level acquired by the viewer level acquisition unit, conceals words whose concealment level is higher than the viewer level, and stores the concealment file Is generated.

The document concealment device of the present invention is
A secret word storage unit for storing a secret word to be concealed;
A secret word that extracts a word contained in the document file from a document file and stores a word different from the secret word stored in the secret word storage unit in the extracted word as a new secret word in the secret word storage unit And a registration unit.

The document concealment program of the present invention is
A document concealment system including a concealment word storage unit that stores concealment secret words and a document file storage unit that stores a document file including a plurality of words is caused to function.
The document concealment program is
The word contained in the document file is extracted from the document file stored in the document file storage unit, and a word different from the secret word stored in the secret word storage unit among the extracted words is used as a new secret word. A secret word registration unit to be stored in the secret word storage unit;
A browsing file acquisition unit that acquires a specific document file as a browsing file from the document file storage unit;
A secret file generating unit that generates a secret file by concealing the same word as the secret word stored in the secret word storage unit among the words included in the browse file acquired by the browse file acquisition unit;
The document concealment system is caused to function as a concealment file output unit that outputs a concealment file generated by the concealment file generation unit.

  The concealment file generation unit conceals the word by replacing the same word as the concealment word stored in the concealment word storage unit among the words included in the browsing file with a predetermined concealment notation.

  The secret word registration unit extracts words belonging to a predetermined part of speech from the document file.

  The secret word registration unit extracts at least one of a proper noun and a few nouns from the document file.

  The secret word registration unit extracts a word including a numerical value and a unit from the document file.

The document concealment system further includes:
A disclosure word storage unit for storing disclosed disclosure words;
The secret word registration unit is a word different from the secret word stored in the secret word storage unit and different from the disclosed word stored in the disclosure word storage unit among the words extracted from the document file Is stored in the secret word storage unit as the new secret word.

The secret word storage unit stores a secret type indicating which of the secret word and the browsing file including the secret word to be secreted in association with each secret word,
The secret word registration unit acquires a secret type of the same secret word as the word extracted from the document file among the secret types stored in the secret word storage unit, and any one of the acquired secret types Is stored in the secret word storage unit as a secret type of the new secret word,
The secret file generation unit acquires a secret type of a secret word that is the same as a word included in the browse file among the secret types stored in the secret word storage unit, and each secret word based on the acquired secret type It is determined which of the browsing files is concealed, and the concealment file is generated when it is determined that each concealment word is concealed.

The secret word storage unit stores a secret combination obtained by combining specific secret words,
The secret word registration unit determines whether the document file includes a combination of the same words as a secret combination stored in the secret word storage unit based on a word extracted from the document file, and When it is determined that the same word combination as the secret combination is included in the document file, the new secret word is stored in the secret word storage unit.

The statement Shohi anonymous system further,
A user information storage unit for storing a browsing level given to each user;
The document concealment program is
To function the sentence Shohi anonymous system as a viewer level acquisition unit that acquires from the user information storage unit a viewing levels given to a specific user as a viewer levels,
The secret word storage unit stores a specific secret level in association with each secret word,
The secret word registration unit selects, as registered words, the same words as the secret words stored in the secret word storage unit among the words extracted from the document file, and sets a secret level of the selected registered words. Acquired from the word storage unit, and stored in the secret word storage unit as a secret level of the new secret word among any of the acquired secret levels,
The secret file generation unit selects the same word as the secret word stored in the secret word storage unit from the words included in the browsing file, and sets a secret level associated with the same secret word as the selected word. The concealment file obtained from the concealment word storage unit, compares the concealment level acquired with the viewer level acquired by the viewer level acquisition unit, conceals words whose concealment level is higher than the viewer level, and stores the concealment file Is generated.

The document concealment program of the present invention is
A document concealment device including a concealment word storage unit that stores concealment concealment words is caused to function.
The document concealment program is
A secret word that extracts a word contained in the document file from a document file and stores a word different from the secret word stored in the secret word storage unit in the extracted word as a new secret word in the secret word storage unit The document concealment device functions as a registration unit.

The document concealment method of the present invention includes:
A secret word storage unit for storing a secret word to be concealed, a document file storage unit for storing a document file including a plurality of words, and a word included in the document file from the document file stored in the document file storage unit The extracted word is executed by a document concealment system including a concealment word registration unit that stores a word different from the concealment word stored in the concealment word storage unit as a new concealment word in the concealment word storage unit To do.
In the document concealment method,
The browsing file acquisition unit acquires a specific document file as a browsing file from the document file storage unit,
The secret file generation unit generates a secret file by concealing the same word as the secret word stored in the secret word storage unit among the words included in the browse file acquired by the browse file acquisition unit,
The secret file output unit outputs the secret file generated by the secret file generation unit.

The document concealment method of the present invention includes:
This is executed by a document concealment device including a concealment word storage unit that stores concealment secret words.
In the document concealment method,
The secret word registration unit extracts a word included in the document file from the document file, and stores the secret word as a new secret word, which is different from the secret word stored in the secret word storage unit among the extracted words Store in the department.

  According to the present invention, for example, a document file can be efficiently concealed.

1 is a configuration diagram of a document concealment system 100 according to Embodiment 1. FIG. The figure which shows the confidential word table 291 and the user information table 292 in Embodiment 1. FIG. 5 is a flowchart showing a document concealment method (document file registration method) in the first embodiment. The flowchart which shows the confidential word registration process (S200) in Embodiment 1. FIG. The figure which shows the specific example of the secret word registration process (S200) in Embodiment 1. FIG. The figure which shows the specific example of the secret word registration process (S200) in Embodiment 1. FIG. The figure which shows the specific example of the secret word registration process (S200) in Embodiment 1. FIG. 5 is a flowchart showing a document concealment method (document file providing method) in the first embodiment. The flowchart which shows the confidential file production | generation process (S300) in Embodiment 1. The figure which shows the specific example of the secret file production | generation process (S300) in Embodiment 1. FIG. The figure which shows the specific example of the secret file production | generation process (S300) in Embodiment 1. FIG. FIG. 3 is a diagram illustrating an example of hardware resources of the document concealment apparatus 200 according to Embodiment 1. FIG. 6 is a configuration diagram illustrating another example of the document concealment system 100 according to the first embodiment. The block diagram of the document concealment system 100 in Embodiment 2. FIG. The flowchart which shows the confidential word registration process (S200) in Embodiment 2. FIG. The figure which shows the specific example of the secret word registration process (S200) in Embodiment 2. FIG. The flowchart which shows the confidential file production | generation process (S300) in Embodiment 2. FIG. The figure which shows the specific example of the secret file production | generation process (S300) in Embodiment 2. FIG. The figure which shows the specific example of the secret file production | generation process (S300) in Embodiment 2. FIG. The figure which shows the confidential word table 291 and the user information table 292 in Embodiment 3. FIG. The flowchart which shows the secret word registration process (S200) in Embodiment 3. FIG. The figure which shows the specific example of the secret word registration process (S200) in Embodiment 3. FIG. The flowchart which shows the confidential file production | generation process (S300) in Embodiment 3. The figure which shows the specific example of the secret file production | generation process (S300) in Embodiment 3. FIG. The figure which shows the specific example of the secret file production | generation process (S300) in Embodiment 3. FIG. The figure which shows the confidential word table 291 and the user information table 292 in Embodiment 4. FIG. The flowchart which shows the secret word registration process (S200) in Embodiment 4. The figure which shows the specific example of the secret word registration process (S200) in Embodiment 4. FIG. The figure which shows the specific example of the secret file production | generation process (S300) in Embodiment 4. FIG. The figure which shows the specific example of the secret file production | generation process (S300) in Embodiment 4. FIG.

Embodiment 1 FIG.
A document concealment system that automatically registers a word to be concealed and conceals the registered word to provide a document file will be described.

FIG. 1 is a configuration diagram of a document concealment system 100 according to the first embodiment.
The configuration of the document concealment system 100 according to Embodiment 1 will be described with reference to FIG.

The document concealment system 100 includes a document concealment device 200, a file server 130, a user terminal 110, and an administrator terminal 120.
The document concealment apparatus 200, the file server 130, the user terminal 110, and the administrator terminal 120 communicate via the network 101.

The file server 130 is a device (computer) that stores and manages the document file 139 to be concealed.
The file server 130 includes a file server control unit 131 and a file server storage unit 132.

The file server control unit 131 executes information processing of the file server 130 such as communication and registration of the document file 139.
The file server storage unit 132 (an example of a document file storage unit) stores the registered document file 139.

  The document file 139 is data representing a document including a plurality of words.

The document concealment device 200 is a computer that generates a concealed document file 139.
The document concealment device 200 includes a document file registration unit 210, a concealment word registration unit 220, a viewer level acquisition unit 230, a browse file acquisition unit 240, a concealment file generation unit 250, a concealment file output unit 260, and a document concealment device storage unit 290. Prepare.

The document concealment device storage unit 290 (an example of a concealment word storage unit and a user information storage unit) stores data used by the document concealment device 200.
For example, the secret word table 291 and the user information table 292 are examples of data stored in the document secret device storage unit 290.

The secret word table 291 is data in which a secret word and a secret level are set in association with each other.
The secret word is a word that is concealed from a user who is given a browsing level lower than a specific level.
The secrecy level is a browsing level (specific level) of a user necessary for disclosing the secret word.

  The user information table 292 is data in which a browsing level given to each user is set.

  The document file registration unit 210 registers a new document file 139 in the file server 130.

The secret word registration unit 220 extracts words included in the document file 139 from the document file 139 registered in the file server 130. For example, the secret word registration unit 220 extracts words belonging to a predetermined part of speech (such as proper nouns) from words included in the document file 139.
The secret word registration unit 220 uses a word (unregistered word) (for example, an unregistered proper noun, which will be described later) different from the secret word set in the secret word table 291 among the extracted words as a new secret word. Set in table 291.

The secret word registration unit 220 selects, as registered words, the same words (for example, registered proper nouns described later) as the secret words set in the secret word table 291 among the words extracted from the document file 139.
The secret word registration unit 220 acquires the secret level of the selected registered words from the secret word table 291.
The secret word registration unit 220 sets one of the acquired secret levels in the secret word table 291 as the secret level of the new secret word.

  The browsing level acquisition unit 230 acquires the browsing level given to a specific user from the user information table 292 as the browsing level.

  The browsing file acquisition unit 240 acquires a specific document file from the file server 130 as a browsing file.

  The secret file generation unit 250 generates a secret file by concealing the same word as the secret word set in the secret word table 291 among the words included in the browse file acquired by the browse file acquisition unit 240.

  For example, the secret file generation unit 250 conceals the word by replacing the same word as the secret word set in the secret word table 291 among the words included in the browse file with a predetermined secret notation.

For example, the secret file generation unit 250 generates a secret file as follows.
The secret file generation unit 250 selects the same words as the secret words set in the secret word table 291 from the words included in the browse file.
The secret file generation unit 250 acquires a secret level associated with the same secret word as the selected word from the secret word table 291.
The secret file generation unit 250 compares the acquired secret level with the viewer level acquired by the viewer level acquisition unit 230.
The secret file generation unit 250 generates a secret file by concealing words whose secret level is higher than the viewer level.

  The secret file output unit 260 outputs the secret file generated by the secret file generation unit 250. For example, the secret file output unit 260 transmits the secret file to the user terminal 110.

The administrator terminal 120 is a device used by an administrator who wants to keep the document file 139 secret. For example, the administrator operates the administrator terminal 120 to request the document concealment apparatus 200 to register the document file 139.
The administrator terminal 120 includes an administrator terminal control unit 121.
The administrator terminal control unit 121 executes information processing of the administrator terminal 120 such as data editing / display / communication.

The user terminal 110 is a device used by a user who wants to browse the document file 139. For example, the user operates the user terminal 110 to request the document concealment apparatus 200 to disclose the document file 139 and browse the concealment file transmitted from the document concealment apparatus 200 on the screen of the user terminal 110.
The user terminal 110 includes a user terminal control unit 111.
The user terminal control unit 111 executes information processing of the user terminal 110 such as data editing / display / communication.

FIG. 2 is a diagram showing the secret word table 291 and the user information table 292 according to the first embodiment.
The secret word table 291 and the user information table 292 in Embodiment 1 will be described with reference to FIG.

  The secret word table 291 is data in which a “secret word” and a “secret level” are associated with each other.

  The “confidential word” indicates a word (confidential word) that the user wants to conceal from a user with a low browsing level. The secret word is registered in the secret word table 291 manually by the administrator or automatically by the secret word registration unit 220. Further, the administrator can delete the secret word, and can also register the secret word as a general proper noun that can be disclosed in the disclosed word list 293 described in the second embodiment.

The “confidential level” indicates the browsing level of the user necessary for disclosure of the confidential word. The administrator can change the level of secrecy.
In Embodiment 1, it is assumed that the concealment level (or browsing level) is higher as the value is larger. That is, in the first embodiment, the concealment level (or browsing level) is higher for “2” than “1”, and higher for “3” than “2”.

In the first embodiment, it is assumed that the confidential word table 291 generated by the administrator is stored in advance in the document confidential device storage unit 290.
In this secret word table 291, the proper nouns “Information Taro”, “Information Jiro”, and “Mission A” are set as the secret words, and “1”, “2”, and “3” are set as the secret level of each proper noun. .

  The user information table 292 is data in which “user ID” and “browsing level” are associated with each other.

  “User ID” is an identifier for identifying a user.

  The “browsing level” indicates a browsing level given to the user.

In the first embodiment, it is assumed that a user information table 292 generated by an administrator is stored in advance in the document concealment device storage unit 290.
The browsing level of the user identified by “USER001” is “1”, and the browsing level of the user identified by “USER002” is “2”.

FIG. 3 is a flowchart showing the document concealment method (document file registration method) in the first embodiment.
A document file registration method for registering a document file to be concealed will be described with reference to FIG.

In step S <b> 101, the administrator inputs a document file (new file) to be concealed to the administrator terminal 120.
The administrator terminal control unit 121 of the administrator terminal 120 generates a document file registration request (data) including the input document file, and transmits the generated document file registration request to the document concealment apparatus 200.
After S101, the process proceeds to S102.

In step S <b> 102, the document file registration unit 210 of the document concealment apparatus 200 receives the document file registration request transmitted from the administrator terminal 120.
The document file registration unit 210 transmits the received document file registration request to the file server 130.
After S102, the process proceeds to S103.

In step S <b> 103, the file server control unit 131 of the file server 130 receives the document file registration request transmitted from the document concealment apparatus 200.
The file server control unit 131 acquires the document file 139 from the received document file registration request, and stores (registers) the acquired document file in the file server storage unit 132 as a new document file 139.
After S103, the process proceeds to S200.

In S200, the secret word registration unit 220 of the document secret device 200 extracts a secret word from the document file included in the document file registration request, and registers the extracted secret word in the secret word table 291.
Details of the secret word registration process (S200) will be described later.

By S200, the processing of the document concealment method (document file registration method) ends.
However, the secret word registration process (S200) may be executed before the process of registering the document file 139 in the file server 130 (S102, S103).

  By executing the process of the document concealment method (document file registration method), the document file 139 is added to the file server 130, and the concealment word is added to the concealment word table 291.

FIG. 4 is a flowchart showing the secret word registration process (S200) in the first embodiment.
The secret word registration process (S200) in Embodiment 1 is demonstrated based on FIG.

In S <b> 210, the secret word registration unit 220 acquires the document file 139 (new file) from the document file registration request transmitted from the administrator terminal 120.
The secret word registration unit 220 extracts proper nouns from the acquired document file 139. For example, the secret word registration unit 220 extracts proper nouns from the document file 139 by performing morphological analysis on the document file 139.
It progresses to S220 after S210.

In S220, the secret word registration unit 220 selects proper nouns registered as secret words in the secret word table 291 from the proper nouns extracted from the document file 139.
For example, the secret word registration unit 220 searches the secret word table 291 using each proper noun extracted from the document file 139 as a search key, and selects proper nouns that match the secret words set in the secret word table 291. .
Hereinafter, the proper nouns selected in S220 are referred to as “registered proper nouns”, and among the proper nouns extracted from the document file 139, proper nouns other than the registered proper nouns are referred to as “unregistered proper nouns”.
It progresses to S230 after S220.

In S230, the secret word registration unit 220 acquires the secret level of each registered proper noun from the secret word table 291.
It progresses to S240 after S230.

In S240, the secret word registration unit 220 registers (sets) an unregistered proper noun in the secret word table 291 as a new secret word among the proper nouns extracted from the document file 139.
The secret word registration unit 220 sets the same secret level as that of any registered proper noun in the secret word table 291 as the secret level of the new secret word.
By S240, the secret word registration process (S200) ends.

5 to 7 are diagrams showing specific examples of the secret word registration process (S200) in the first embodiment.
A specific example of the secret word registration process (S200) in the first embodiment will be described with reference to FIGS.

<Specific example 1>
As shown in FIG. 5, the document file 139a having the file name “a document” includes three proper nouns “B system”, “Information Taro”, and “Information Saburo”.
The secret word registration unit 220 extracts three proper nouns “B system”, “Information Taro”, and “Information Saburo” from the document file 139a, and generates a word list 221 in which the three extracted proper nouns are set.

In the secret word table 291 shown in FIG. 2, only “Information Taro” among the extracted three proper nouns “B system”, “Information Taro”, and “Information Saburo” is set.
Therefore, “Information Taro” is a registered proper noun, and the remaining “B system” and “Information Saburo” are unregistered proper nouns.
The secret level of “Information Taro” is “1”.

As illustrated in FIG. 5, the secret word registration unit 220 sets “B system” and “Information Saburo”, which are unregistered proper nouns, as new secret words in the secret word table 291.
The secret word registration unit 220 sets, in the secret word table 291, the same secret level “1” as that of the registered proper noun “Information Taro” as the secret level of the new secret word “B system” “Information Saburo”.

<Specific example 2>
As shown in FIG. 6, the document file 139b having the file name “b document” includes five proper nouns “mission A” “B system” “information Taro” “information Jiro” “information Saburo”.
The secret word registration unit 220 extracts five proper nouns “Mission A”, “B system”, “Information Taro”, “Information Jiro”, and “Information Saburo” from the document file 139b, and sets the extracted five proper nouns. A list 221 is generated.

The secret word table 291 shown in FIG. 2 includes “Mission A”, “Information Taro”, “Information” among the extracted five proper nouns “Mission A”, “B System”, “Information Taro”, “Information Jiro”, and “Information Saburo”. “Jiro” is set.
Therefore, “Mission A”, “Information Taro” and “Information Jiro” are registered proper nouns, and the remaining “B System” and “Information Saburo” are unregistered proper nouns.
The secret level of “Mission A” is “3”, the secret level of “Information Taro” is “1”, and the secret level of “Information Jiro” is “2”.

As illustrated in FIG. 6, the secret word registration unit 220 sets “B system” and “Information Saburo”, which are unregistered proper nouns, as new secret words in the secret word table 291.
The secret word registration unit 220 selects the highest secret level “3 (mission A)” among the secret levels of the registered proper nouns “Mission A”, “Information Taro”, and “Information Jiro”, and newly selects the selected secret level. The secret level of the secret word “B system” and “Information Saburo” is set in the secret word table 291. However, the secret word registration unit 220 sets the lowest secret level “1 (Information Taro)” or intermediate (average) secret level “2 (Information Jiro)” among the secret levels of registered proper nouns as new secret words. You may set as a secrecy level. Also, the secret word registration unit 220 may randomly select a secret level from the secret levels of each registered proper noun, and set the selected secret level as a secret level of a new secret word.

<Specific example 3>
As shown in FIG. 7, the document file 139c having the file name “c document” includes four proper nouns “C device”, “B system”, “Information Taro”, and “Information Jiro”.
The secret word registration unit 220 extracts four proper nouns “C device”, “B system”, “Information Taro”, and “Information Jiro” from the document file 139c, and generates a word list 221 in which the extracted four proper nouns are set. To do.

In the concealment word table 291 shown in FIG. 6, “B system”, “Information Taro”, and “Information Jiro” are set out of the extracted four proper nouns “C device”, “B system”, “Information Taro”, and “Information Jiro”. Has been. "B system" is a secret word extracted and registered from the document file 139b.
Therefore, “B system”, “Information Taro”, and “Information Jiro” are registered proper nouns, and the remaining “C device” is unregistered proper nouns.
Further, the secret level of “B system” is “3”, the secret level of “Information Taro” is “1”, and the secret level of “Information Jiro” is “2”.

As illustrated in FIG. 7, the secret word registration unit 220 sets “C device”, which is an unregistered proper noun, as a new secret word in the secret word table 291.
The secret word registration unit 220 selects the highest secret level “3 (B system)” among the secret levels of the registered proper nouns “B system”, “Information Taro”, and “Information Jiro”, and newly selects the selected secret level. The secret level of the secret word “C device” is set in the secret word table 291. However, as described with reference to FIG. 6, the secret word registration unit 220 sets the lowest secret level, the intermediate (average) secret level, or the randomly selected secret level among the secret levels of the registered proper nouns as new secrets. It may be set as a word concealment level.

FIG. 8 is a flowchart showing the document concealment method (document file providing method) in the first embodiment.
A document file providing method for providing a concealed document file 139 (confidential file) will be described with reference to FIG.

In S <b> 111, the user (viewer) inputs his / her user ID and the file name of the document file 139 to be browsed to the user terminal 110. Hereinafter, the user ID input to the user terminal 110 is referred to as “browser ID”, and the file name input to the user terminal 110 is referred to as “browsing file name”.
The user terminal control unit 111 of the user terminal 110 generates a document file provision request (data) including the input viewer ID and the browse file name, and sends the generated document file provision request to the document concealment apparatus 200. Send.
It progresses to S112 after S111.

In S <b> 112, the browser level acquisition unit 230 of the document concealment apparatus 200 receives the document file provision request transmitted from the user terminal 110.
The browser level acquisition unit 230 acquires the browser ID from the received document file provision request, and sets the browsing level associated with the same user ID as the acquired browser ID to the user information table 292 (see FIG. 2). Get from.
Hereinafter, the browsing level acquired in S112 is referred to as “browser level”.
It progresses to S113 after S112.

In S113, the browse file acquisition unit 240 of the document concealment apparatus 200 acquires a browse file name from the document file provision request, generates a document file request (data) including the acquired browse file name, and generates the generated document file request. Is transmitted to the file server 130.
The file server control unit 131 of the file server 130 receives the document file request, acquires the browse file name from the received document file request, and retrieves the document file 139 identified by the acquired browse file name from the file server storage unit 132. get.
The file server control unit 131 of the file server 130 generates a document file response (data) including the acquired document file 139, and transmits the generated document file response to the document concealment apparatus 200.
The browse file acquisition unit 240 of the document concealment apparatus 200 receives the document file response and acquires the document file 139 from the received document file response.
Hereinafter, the document file 139 acquired in S113 is referred to as “browsing file”.
It progresses to S300 after S113. However, you may perform the process (S113) which acquires a browsing file, before the process (S112) which acquires a viewer level.

In S300, the secret file generation unit 250 of the document secret device 200 conceals a proper noun (confidential word) whose secret level is higher than the viewer level among the proper nouns in the browse file based on the secret word table 291. Is generated.
Details of the secret file generation process (S300) will be described later.
It progresses to S114 after S300.

In S <b> 114, the secret file output unit 260 of the document secret device 200 generates a document file provision response (data) including the secret file, and transmits the generated document file provision response to the user terminal 110.
It progresses to S115 after S114.

In S115, the user terminal control unit 111 of the user terminal 110 receives the document file provision response, acquires the confidential file from the received document file provision response, and displays the acquired confidential file on the display.
The process of the document concealment method (document file providing method) is terminated by S115.

FIG. 9 is a flowchart showing the secret file generation process (S300) in the first embodiment.
The secret file generation process (S300) in the first embodiment will be described with reference to FIG.

In S <b> 310, the secret file generation unit 250 extracts a proper noun from the document file 139 (browsing file) acquired by the browsing file acquisition unit 240.
For example, the secret file generation unit 250 extracts proper nouns from the document file 139 by performing morphological analysis on the document file 139.
It progresses to S320 after S310.

In S320, the secret file generation unit 250 acquires the secret level of each proper noun extracted from the document file 139 from the secret word table 291.
For example, the secret file generation unit 250 searches the secret word table 291 using each proper noun extracted from the document file 139 as a search key, and sets the secret level associated with the secret word that matches the search key to the proper noun. The secret level is acquired from the secret word table 291.
It progresses to S330 after S320.

In S330, the secret file generation unit 250 compares the secret level of each proper noun with the viewer level acquired by the viewer level acquisition unit 230.
The secret file generation unit 250 selects proper nouns (confidential target words) whose secret level is higher than the viewer level based on the comparison result.
It progresses to S340 after S330.

In S340, the secret file generation unit 250 generates a secret file from the document file 139 using the proper noun (the secret target word) selected in S330 as a hidden character.
For example, the concealment file generation unit 250 searches the document file 139 using the concealment target word as a search key, specifies a part where the concealment target word is written as the concealment target part, and sets each identified concealment target part to a predetermined concealment Replace with notation.
By S340, the secret file generation process (S300) ends.

10 and 11 are diagrams illustrating specific examples of the secret file generation process (S300) in the first embodiment.
A specific example of the secret file generation process (S300) in the first embodiment will be described with reference to FIGS.

As shown in FIG. 10, the document file 139c having the file name “c document” includes four proper nouns “C device”, “B system”, “Information Taro”, and “Information Jiro”.
The secret file generation unit 250 extracts four proper nouns “C device”, “B system”, “Information Taro”, and “Information Jiro” from the document file 139c, and generates a word list 251 in which the four extracted proper nouns are set. To do.

The secret file generation unit 250 searches the secret word table 291 using each extracted proper noun as a search key, and acquires a secret level associated with the secret word that matches the search key.
The secret level of “C device” is “3”, the secret level of “B system” is “3”, the secret level of “Information Taro” is “1”, and the secret level of “Information Jiro” is “2”.
The secret file generation unit 250 sets the secret level of each proper noun in the word list 251.

In FIG. 11, the secret file generation unit 250 compares the secret level of each proper noun with the viewer level. Here, the viewer level is “2”.
The secret file generation unit 250 sets the comparison result in the word list 251. In the figure, “◯” indicates that the viewer level is higher than the confidential level, and “X” indicates that the viewer level is lower than the confidential level. That is, the concealment level “3” of the proper noun “C device” and “B system” with “×” is higher than the viewer level “2”.
Hereinafter, the proper nouns “C device” and “B system” whose concealment level is higher than the viewer level are referred to as “confidential target words”.

The secret file generation unit 250 generates the secret file 252c with the word “C device” and the “B system” in the document file 139c hidden.
The concealment file 252c in the figure represents the concealment target words “C device” and “B system” with black squares (an example of concealment notation). However, the word to be concealed may be expressed by other notation such as a blank or a cross instead of the black square.

FIG. 12 is a diagram illustrating an example of hardware resources of the document concealment device 200 according to the first embodiment.
In FIG. 12, a document concealment device 200 (an example of a computer) includes a CPU 901 (Central Processing Unit). The CPU 901 is connected to hardware devices such as a ROM 903, a RAM 904, a communication device 905, a display 911 (display device), a keyboard 912, a mouse 913, a drive device 914, and a magnetic disk device 920 via a bus 902. Control the device. The drive device 914 is a device that reads and writes a storage medium such as an FD (Flexible Disk Drive), a CD (Compact Disc), and a DVD (Digital Versatile Disc).
The ROM 903, the RAM 904, the magnetic disk device 920, and the drive device 914 are examples of storage devices. A keyboard 912, a mouse 913, and a communication device 905 are examples of input devices. The display 911 and the communication device 905 are examples of output devices.

  The communication device 905 is wired or wirelessly connected to a communication network such as a LAN (Local Area Network), the Internet, or a telephone line.

  The magnetic disk device 920 stores an OS 921 (operating system), a program group 922, and a file group 923.

  The program group 922 includes programs that execute the functions described as “units” in the embodiments. A program (for example, a document concealment program, a document file registration program, and a document file provision program) is read and executed by the CPU 901. That is, the program causes the computer to function as “to part”, and causes the computer to execute the procedures and methods of “to part”.

  The file group 923 includes various data (input, output, determination result, calculation result, processing result, etc.) used in “˜part” described in the embodiment.

In the embodiment, arrows included in the configuration diagrams and flowcharts mainly indicate input and output of data and signals.
The processing of the embodiment described based on the flowchart and the like is executed using hardware such as the CPU 901, a storage device, an input device, and an output device.

  In the embodiment, what is described as “to part” may be “to circuit”, “to apparatus”, and “to device”, and “to step”, “to procedure”, and “to processing”. May be. That is, what is described as “to part” may be implemented by any of firmware, software, hardware, or a combination thereof.

  Similar to the document concealment apparatus 200, the user terminal 110, the administrator terminal 120, and the file server 130 also include hardware resources.

FIG. 13 is a configuration diagram illustrating another example of the document concealment system 100 according to the first embodiment.
As shown in FIG. 13, the document concealment device 200 may also serve as the file server 130 (see FIG. 1). That is, the document file 139 may be registered in the document secret device storage unit 290.

  Further, the secret word table 291 and the user information table 292 may be stored in the file server 130 or a separately provided database device (not shown).

  In the first embodiment, the proper noun is extracted from the document file 139, and the proper noun is registered in the secret word table 291 as the secret word. However, words other than proper nouns may be extracted and registered as secret words. In other words, words belonging to other parts of speech such as nouns (including general nouns, pronouns, numerical nouns, etc.), verbs, and adjectives may be registered as secret words. Further, all words may be extracted from the document file 139 and registered as secret words regardless of the type of words or parts of speech belonging to any of a plurality of parts of speech (for example, nouns, verbs, and adjectives).

  The words and secret words extracted from the document file 139 include words (proprietary nouns, idioms, compound words, synthesized words) that are handled as a single word by combining a plurality of words. For example, as shown in FIG. 2, the name “Information Taro” in which the last name “Information” and the name “Taro” are combined may be treated as one word (secret word).

  The word and secret word extracted from the document file 139 may be a word representing a quantity (numerical number, numerical noun, quantifier). That is, the word (secret word) may include a numerical value. For example, “170 cm” in which the numerical value “170” is combined with the unit “cm (centimeter)”, “60 kg” in which the numerical value “60” is combined with the unit “kg (kilogram)”, etc. I do not care. Further, the nouns “height” and “weight” modified by the numerical value and the unit may be combined to treat “height 170 cm”, “weight 60 kg”, etc. as a secret word.

  In the first embodiment, for example, the following document concealment system 100 has been described.

In the secret word table 291, a specific proper noun that is first known by each administrator is registered as a secret word together with a secret level.
When registering the document file 139, the document concealment device 200 automatically registers the proper nouns written in the document file 139 together with the concealment word in the concealment word table 291 together with the concealment level of the concealment word as a word to be concealed. That is, as the document file 139 is registered, the secret word database (the secret word table 291) is expanded.
This eliminates the need for the administrator to perform a secret level assignment operation, and prevents an uncertain secret level from being assigned based on the subjectivity of each administrator.

  The document concealment apparatus 200 provides a document file 139 by replacing a proper noun of a concealment level that is not suitable for the user with a prone character based on the concealment word table 291. Thereby, provision of the document file 139 based on the Need To Know principle can be forced.

  That is, the document concealment system 100 can conceal the document file efficiently and effectively.

Embodiment 2. FIG.
A description will be given of a form of disclosure without making a specific word a hidden character regardless of the browsing level of the user.
Hereinafter, items different from the first embodiment will be mainly described. Matters not described are the same as those in the first embodiment.

FIG. 14 is a configuration diagram of the document concealment system 100 according to the second embodiment.
The configuration of the document concealment system 100 according to Embodiment 2 will be described with reference to FIG.

The document concealment device storage unit 290 (an example of the concealment word storage unit) of the document concealment device 200 stores the disclosed word list 293.
The disclosed word list 293 is data in which disclosed words (for example, general proper nouns described later) to be disclosed to each user are set.
For example, general proper nouns described in a dictionary or the like are registered in advance in the disclosed word list 293. This is to prevent extraction of general proper nouns as specific proper nouns (secret words). The administrator can add proper nouns to the disclosed word list 293, but a plurality of the same proper nouns cannot be registered.

  The secret word registration unit 220 newly selects a word that is different from the secret word set in the secret word table 291 and different from the disclosed word set in the disclosure word list 293 among the words extracted from the document file 139. The secret word is stored in the secret word table 291 as a secret word.

The document concealment method (document file registration method) is the same as in the first embodiment (see FIG. 3).
However, a part of the secret word registration process (S200) is different from the first embodiment.

FIG. 15 is a flowchart showing the secret word registration process (S200) in the second embodiment.
The secret word registration process (S200) in Embodiment 2 is demonstrated based on FIG.

  The processing from S210 to S230 is the same as in the first embodiment (see FIG. 4).

  The secret word registration unit 220 executes S241-1, 2 instead of S240 described in the first embodiment.

In S241-1, the secret word registration unit 220 selects unregistered proper nouns that are not set in the disclosed word list 293 from the proper nouns extracted from the document file 139. The unregistered proper noun is a proper noun other than the proper noun registered as a secret word among the proper nouns extracted from the document file 139.
For example, the secret word registration unit 220 searches the disclosed word list 293 using each unregistered proper noun as a search key, and finds an unregistered proper noun different from any general proper noun set in the disclosed word list 293. Sort out.
It progresses to S241-2 after S241-1.

In S241-2, the secret word registration unit 220 registers (sets) the unregistered proper noun selected in S241 as a new secret word in the secret word table 291.
The secret word registration unit 220 sets the same secret level as that of any registered proper noun in the secret word table 291 as the secret level of the new secret word.
The secret word registration process (S200) is terminated by S241-2.

  However, the process (S241-1) of selecting unregistered proper nouns may be executed before the process (S220, S230) of acquiring the secret level of registered proper nouns.

FIG. 16 is a diagram illustrating a specific example of the secret word registration process (S200) according to the second embodiment.
A specific example of the secret word registration process (S200) in the second embodiment will be described with reference to FIG.

The document file 139d having the file name “d document” includes five proper nouns “Ministry of Economy, Trade and Industry”, “D system”, “Information Taro”, “Information Jiro”, and “Taro Patent”.
The secret word registration unit 220 extracts five proper nouns “Ministry of Economy, Trade and Industry”, “D system”, “Information Taro”, “Information Jiro”, and “Taro Taro” from the document file 139d, and sets the extracted five proper nouns. A word list 221 is generated.

In the disclosed word list 293, three general proper nouns “Patent Taro”, “Ministry of Economy, Trade and Industry” and “Patent Office” are set.
The secret word registration unit 220 deletes the general proper nouns “Ministry of Economy, Trade and Industry” and “Patent Taro” set in the disclosed word list 293 from the word list 221.
Hereinafter, the three proper nouns “D system”, “Information Taro”, and “Information Jiro” remaining in the word list 221 are referred to as “specific proper nouns”.

In the secret word table 291 (see FIG. 2), “Information Taro” and “Information Jiro” among the three proper nouns “D system”, “Information Taro”, and “Information Jiro” set in the word list 221 are set. Yes.
Therefore, “Information Taro” and “Information Jiro” are registered specific proper nouns, and the remaining “D system” is unregistered specific proper nouns.
The secret level of “Information Taro” is “1”, and the secret level of “Information Jiro” is “2”.

As illustrated in FIG. 16, the secret word registration unit 220 sets “D system”, which is an unregistered specific proper noun, as a new secret word in the secret word table 291.
The secret word registration unit 220 selects the highest secret level “2 (Information Jiro)” among the secret levels of the registered specific proper nouns “Information Taro” and “Information Jiro”, and sets the selected secret level as a new secret word. The secret level of “D system” is set in the secret word table 291. However, as described with reference to FIG. 6, the secret word registration unit 220 sets the lowest secret level, the intermediate (average) secret level, or the randomly selected secret level among the secret levels of the registered proper nouns as new secrets. It may be set as a word concealment level.

The document concealment method (document file providing method) is the same as in the first embodiment (see FIG. 8).
However, a part of the secret file generation process (S300) is different from the first embodiment.

FIG. 17 is a flowchart showing a secret file generation process (S300) according to the second embodiment.
The secret file generation process (S300) in the second embodiment will be described with reference to FIG.

  The process of S310 is the same as that of the first embodiment (see FIG. 9).

The secret file generation unit 250 executes S311 to S341 instead of S320 to S340 described in the first embodiment.
S321 to S341 are processes corresponding to S320 to S340.

In S311, the secret file generation unit 250 selects proper nouns that are not set in the disclosed word list 293 from the proper nouns extracted from the document file 139 in S310.
For example, the secret file generation unit 250 searches the disclosed word list 293 using each proper noun as a search key, and selects proper nouns that are different from any general proper nouns set in the disclosed word list 293.
Hereinafter, the proper nouns selected in S311 are referred to as “specific proper nouns”.
After S311, the process proceeds to S321.

The processing from S321 to S341 is the same processing as S320 to S340, and is the processing in which the “proper noun” extracted in S310 in the processing from S320 to S340 is replaced with the “specific proper noun” selected in S311.
That is, the secret file generation unit 250 acquires the secret level of each specific proper noun from the user information table 292 (S321), selects a specific proper noun with a higher secret level than the viewer level (S331), and selects the specified A secret file is generated from the document file 139 using the proper noun as a hidden character (S341).

However, after the secret file generation unit 250 selects proper nouns whose secrecy level is higher than the viewer level (S310-S330), the secret file generation unit 250 is not set in the disclosed word list 293 among proper nouns whose secrecy level is higher than the viewer level. A specific proper noun may be selected (S311). The secret file generation unit 250 generates a secret file by using the selected specific proper noun as a hidden character (S341).
Further, the secret file generation unit 250 selects proper nouns whose secret level is higher than the viewer level from the proper nouns extracted from the document file 139 (S320, S330), and discloses the proper nouns extracted from the document file 139. A specific proper noun that is not set in the word list 293 may be selected (S311). The secret file generation unit 250 generates a secret file with the specific proper nouns whose concealment level is higher than the viewer level out of the selected specific proper nouns as a hidden character (S341).

18 and 19 are diagrams illustrating specific examples of the secret file generation process (S300) according to the second embodiment.
A specific example of the secret file generation process (S300) in the second embodiment will be described with reference to FIGS.

As shown in FIG. 18, the document file 139 d having the file name “d document” includes five proper nouns “Ministry of Economy, Trade and Industry”, “D system”, “Information Taro”, “Information Jiro”, and “Taro Patent”.
The secret file generation unit 250 extracts five proper nouns “Ministry of Economy, Trade and Industry”, “D system”, “Information Taro”, “Information Jiro”, and “Taro Taro” from the document file 139d, and sets the extracted five proper nouns. A word list 251 is generated.

In the disclosed word list 293, three general proper nouns “Patent Taro”, “Ministry of Economy, Trade and Industry” and “Patent Office” are set.
The secret file generation unit 250 deletes the general proper nouns “Ministry of Economy, Trade and Industry” and “Taro Taro” set in the disclosed word list 293 from the word list 251. The three proper nouns “D system”, “Information Taro”, and “Information Jiro” remaining in the word list 251 are specific proper nouns.

The secret file generation unit 250 searches the secret word table 291 using each specific proper noun as a search key, and acquires the secret level associated with the secret word that matches the search key.
The secret file generation unit 250 sets the secret level of each specific proper noun in the word list 251.

In FIG. 19, the secret file generation unit 250 compares the secret level of each specific proper noun with the viewer level.
As a result of comparison, the secrecy level “2” of the specific proper nouns “D system” and “Information Jiro” is higher than the viewer level “1”.
Hereinafter, the specific proper nouns “D system” and “Jiro Jiro” whose concealment level is higher than the viewer level are referred to as “confidential words”.

  The secret file generation unit 250 generates a secret file 252d with the words “D system” and “Jiro Jiro” in the document file 139d hidden.

In the second embodiment, a mode has been described in which a specific word (for example, a general proper noun) is disclosed without being hidden, regardless of the browsing level of the user.
According to the second embodiment, it is possible to prevent a word that does not need to be concealed from being automatically registered as a concealed word. Moreover, it is possible to prevent a word that does not need to be concealed from being turned over.

  The second embodiment may be combined with the first embodiment as follows, for example.

As in the first embodiment, the document concealment device 200 may also serve as the file server 130, or the concealment word table 291 and the user information table 292 may be stored in the file server 130 or the database device.
In addition, words other than proper nouns may be registered as secret words or disclosed words.

Embodiment 3 FIG.
A mode in which provision of the document file 139 (confidential file) is rejected in accordance with a confidential word included in the document file 139 will be described.
Hereinafter, items different from the first and second embodiments will be mainly described. Matters not described are the same as in the first and second embodiments.

  The configuration of the document concealment system 100 is the same as that of the first embodiment (see FIG. 1). However, each configuration has the following functions.

  In the secret word table 291, a secret type indicating which one of the secret word and the browse file including the secret word is to be concealed is set in association with each secret word.

The secret word registration unit 220 acquires the secret type of the same secret word as the word extracted from the document file 139 among the secret types set in the secret word table 291.
The secret word registration unit 220 sets one of the acquired secret types in the secret word table 291 as the secret type of the new secret word.

The secret file generation unit 250 acquires the secret type of the same secret word as the word included in the browse file among the secret words set in the secret word table 291.
The secret file generation unit 250 determines which of each secret word and the browse file is to be concealed based on the acquired secret type.
The secret file generation unit 250 generates a secret file when it is determined that each secret word is concealed.

FIG. 20 is a diagram showing the secret word table 291 and the user information table 292 according to the third embodiment.
The secret word table 291 in Embodiment 3 will be described with reference to FIG. The user information table 292 is the same as that in the first embodiment (see FIG. 2).

  The secret word table 291 has “secret type” in association with “secret word” and “secret level”.

The “secret type” indicates “word” or “file”.
“Word” means that a secret file is generated by concealing a secret word when the secret level of the secret word included in the document file 139 is higher than the browsing level of the user.
“File” means that the provision of the document file 139 is rejected without generating the secret file when the secret level of the secret word included in the document file 139 is higher than the browsing level of the user.

The document concealment method (document file registration method) is the same as in the first embodiment (see FIG. 3).
However, a part of the secret word registration process (S200) is different from the first embodiment.

FIG. 21 is a flowchart showing the secret word registration process (S200) in the third embodiment.
The secret word registration process (S200) in Embodiment 3 is demonstrated based on FIG.

  S210 and S220 are the same as those in the first embodiment (see FIG. 4).

  The secret word registration unit 220 executes S232 and S242 instead of S230 and S240 described in the first embodiment.

In S232, the secret word registration unit 220 acquires the secret level of the registered proper noun from the secret word table 291 as in S230 of the first embodiment.
Similarly, the secret word registration unit 220 acquires the secret type of the registered proper noun from the secret word table 291.
It progresses to S242 after S232.

In S242, the secret word registration unit 220 registers an unregistered proper noun as a new secret word in the secret word table 291 as in S240 of the first embodiment. Also, the secret word registration unit 220 sets one of the secret levels acquired in S232 in the secret word table 291 as the secret level of the new secret word.
Similarly, the secret word registration unit 220 sets one of the secret types acquired in S232 in the secret word table 291 as the secret type of the new secret word.
By S242, the secret word registration process (S200) ends.

FIG. 22 is a diagram illustrating a specific example of the secret word registration process (S200) in the third embodiment.
A specific example of the secret word registration process (S200) in the third embodiment will be described with reference to FIG.

The document file 139b having the file name “b document” includes five proper nouns “mission A”, “B system”, “information Taro”, “information Jiro”, and “information Saburo”.
The secret word registration unit 220 extracts five proper nouns “Mission A”, “B system”, “Information Taro”, “Information Jiro”, and “Information Saburo” from the document file 139b, and sets the extracted five proper nouns. A list 221 is generated.

Here, among the five proper nouns extracted from the document file 139 b, “Mission A”, “Information Taro”, and “Information Jiro” are registered proper nouns registered in the secret word table 291.
That is, “B system” and “Information Saburo” are unregistered proper nouns.

The secret word registration unit 220 sets the unregistered proper noun “B system” and “Information Saburo” in the secret word table 291 as new secret words.
The secret word registration unit 220 sets the highest secret level “3 (mission A)” among the secret levels of the registered proper nouns in the secret word table 291 as the secret level of the new secret word “B system” and “Information Saburo”. Set. However, the secret word registration unit 220 may set another secret level as the secret level of a new secret word, as described in the first embodiment.
The secret word registration unit 220 selects the secret type “file (mission A)” of the registered proper noun with the highest secret level among the secret types of the registered proper nouns, and sets the selected secret type as a new secret word. The secret word table 291 is set as the secret type of “B system” and “Information Saburo”.

However, the secret word registration unit 220 may set the same secret type “word” as the registered proper noun (information Taro) having the lowest secret level in the secret word table 291 as the secret type of the new secret word. .
Also, the secret word registration unit 220 may select a new secret word secret type based on the secret type of each registered proper noun, regardless of the secret level of each registered proper noun. For example, when the secret type of at least one registered proper noun is “file (or word)”, the secret word registration unit 220 selects “file (or word)” as the secret type of a new secret word. .

The document concealment method (document file providing method) is the same as in the first embodiment (see FIG. 8).
However, a part of the secret file generation process (S300) is different from the first embodiment.

FIG. 23 is a flowchart showing a secret file generation process (S300) in the third embodiment.
The secret file generation process (S300) in the third embodiment will be described with reference to FIG.

The processing from S310 to S330 and the processing from S340 are the same as those in the first embodiment (see FIG. 9).
The secret file generation unit 250 executes S332-1 and S332-2 after S330.

In S332-1, the secret file generation unit 250 acquires the secret type of each proper noun selected in S330 from the user information table 292.
After S332-1, the process proceeds to S332-2.

In S332-2, the secret file generation unit 250 selects a secret type of “word” or “file” based on each secret type acquired in S332-1.
For example, if at least one of the secret types acquired in S332-2 is “file (or word)”, the secret file generation unit 250 selects “file (or word)”.
The secret file generation unit 250 may select the secret type of the proper noun having the highest (or lowest) secret level among the proper nouns selected in S330.
When the selected secret type is “word”, the process proceeds to S340.
If the selected secret type is “file”, the secret file generation process (S300) ends. In this case, the secret file output unit 260 transmits to the user terminal 110 a document file provision response indicating that provision of the document file 139 (confidential file) is rejected. The user terminal 110 receives this document file provision response, and displays a message indicating that provision of the document file 139 has been rejected on the display.

24 and 25 are diagrams illustrating a specific example of the secret file generation process (S300) according to the third embodiment.
A specific example of the secret file generation process (S300) in the third embodiment will be described with reference to FIGS. 24 and 25. FIG.

As shown in FIG. 24, the document file 139b having the file name “b document” includes five proper nouns “mission A” “B system” “information Taro” “information Jiro” “information Saburo”.
The secret word registration unit 220 extracts five proper nouns “Mission A”, “B system”, “Information Taro”, “Information Jiro”, and “Information Saburo” from the document file 139b, and sets the extracted five proper nouns. A list 221 is generated.

The secret file generation unit 250 searches the secret word table 291 using each extracted proper noun as a search key, and acquires a secret level associated with the secret word that matches the search key.
The secret file generation unit 250 sets the secret level of each proper noun in the word list 251.

In FIG. 25, the secret file generation unit 250 compares the secret level of each proper noun with the viewer level.
As a result of comparison, the confidential levels of the proper nouns “mission A”, “B system”, “information Jiro”, and “information Saburo” are higher than the viewer level.
Hereinafter, the proper nouns “mission A”, “B system”, “information Jiro”, and “information Saburo” whose concealment level is higher than the viewer level are referred to as “confidential words”.

The concealment file generation unit 250 acquires the concealment type of the concealment target words “mission A”, “B system”, “Information Jiro”, and “Information Saburo” from the concealment word table 291.
The confidential type of the confidential target word “Information Jiro” is “Word”, and the confidential type of the confidential target words “Mission A”, “B System”, and “Information Saburo” is “File”.

  The concealment file generation unit 250 does not generate a concealment file in which the concealment target word in the document file 139b is turned upside down because “file” is included in the acquired concealment type. That is, the secret file generation unit 250 refuses to provide the document file 139b.

In the third embodiment, the form in which the provision of the document file 139 (confidential file) is rejected according to the confidential word included in the document file 139 has been described.
According to the third embodiment, provision of a document file 139 including a specific secret word and the secret file can be rejected. That is, the confidentiality of the document file 139 can be improved.

  For example, the third embodiment may be combined with the first and second embodiments as follows.

As in the first embodiment, the document concealment device 200 may also serve as the file server 130, or the concealment word table 291 and the user information table 292 may be stored in the file server 130 or the database device.
Further, words other than proper nouns may be registered in the secret word table 291 as secret words.

  As in the second embodiment, the disclosed word list 293 may be provided, and the secret word may be disclosed without being hidden, regardless of the browsing level of the user, when generating the confidential file.

Embodiment 4 FIG.
A description will be given of a mode in which an unregistered word included in the document file 139 is registered as a new secret word when the document file 139 includes a combination of specific secret words.
Hereinafter, items different from the first to third embodiments will be mainly described. Matters not described are the same as in the first to third embodiments.

  The configuration of the document concealment system 100 is the same as that of the first embodiment (see FIG. 1). However, each configuration has the following functions.

  In the secret word table 291, a secret combination in which specific secret words are combined is set.

The secret word registration unit 220 determines whether or not the document file 139 includes a combination of the same words as the secret combinations stored in the secret word table 291 based on the words extracted from the document file 139.
The secret word registration unit 220 sets a new secret word in the secret word table 291 when it is determined that the same combination of words as the secret combination is included in the document file 139.

FIG. 26 is a diagram illustrating the secret word table 291 and the user information table 292 according to the fourth embodiment.
The secret word table 291 according to Embodiment 4 will be described with reference to FIG. The user information table 292 is the same as that in the first embodiment (see FIG. 2).

The “secret word” in the secret word table 291 indicates a single secret word or a combination of secret words. “Mission D” in the figure is an example of a single secret word, and “Information Taro, Mission A”, “Information Taro, B system” and “Information Jiro, C device” in the figure are examples of combinations of secret words. It is. The combination of secret words may be a combination of three or more secret words.
A combination of secret words is set in advance by the administrator, and a single secret word is set by the administrator or the secret word registration unit 220.

  Hereinafter, a combination of secret words set in the secret word table 291 is referred to as a “secret combination”.

The document concealment method (document file registration method) is the same as in the first embodiment (see FIG. 3).
However, a part of the secret word registration process (S200) is different from the first embodiment.

FIG. 27 is a flowchart showing the secret word registration process (S200) in the fourth embodiment.
The secret word registration process (S200) in Embodiment 4 is demonstrated based on FIG.

  S210 is the same as that in the first embodiment (see FIG. 4).

  The secret word registration unit 220 executes S223 to S243 instead of S220 to S240 described in the first embodiment.

In S223, the secret word registration unit 220 sets, in the document file 139, a combination of the same words as at least one of the secret combinations set in the secret word table 291 based on each proper noun extracted from the document file 139 in S210. It is determined whether or not it is included.
If the same combination of words as the secret combination is included in the document file 139 (YES), the process proceeds to S233.
When the same word combination as the secret combination is not included in the document file 139 (NO), the new secret word is not registered, and the secret word registration process (S200) ends.

In S233, the secret word registration unit 220 acquires the secret level of each secret combination, which is the same as the word combination included in the document file 139, from the secret word table 291 based on the processing result of S223.
After S233, the process proceeds to S243.

In S243, the secret word registration unit 220 selects an unregistered proper noun that is not registered as a secret word in the secret word table 291 from a plurality of proper nouns extracted from the document file 139 in S210.
For example, the secret word registration unit 220 searches the secret word table 291 using each proper noun as a search key, and if the secret word matching the search key does not exist in the secret word table 291, the proper noun is not registered. Judge as a noun. The search target may be a single secret word set in the secret word table 291 or may include a secret word constituting a secret combination as a search target.

The secret word registration unit 220 registers (sets) the selected unregistered proper noun in the secret word table 291 as a new secret word.
The secret word registration unit 220 sets one of the secret levels acquired in S233 as the secret level of the new secret word in the secret word table 291.
By S243, the secret word registration process (S200) ends.

FIG. 28 is a diagram illustrating a specific example of the secret word registration process (S200) according to the fourth embodiment.
A specific example of the secret word registration process (S200) in the fourth embodiment will be described with reference to FIG.

The document file 139e having the file name “e document” includes five proper nouns “B system”, “mission D”, “information Taro”, “information Jiro”, and “information Saburo”.
The secret word registration unit 220 extracts five proper nouns “B system”, “mission D”, “Information Taro”, “Information Jiro”, and “Information Saburo” from the document file 139e, and sets the extracted five proper nouns. A list 221 is generated.

In the secret word table 291 shown in FIG. 26, three secret combinations “Information Taro, Mission A”, “Information Taro, B System”, and “Information Jiro, C Device” are set.
Among these three secret combinations, “Information Taro, B system” is included in the word list 221.
The secret level of this secret combination “Information Taro, B system” is “2”.

In the secret word table 291, six secret words “Information Taro” “Mission A” “B System” “Information Jiro” “C Device” “Mission D” are set.
Therefore, among the five proper nouns set in the word list 221, “Information Saburo” is an unregistered proper noun that is not set in the secret word table 291.

The secret word registration unit 220 sets the unregistered proper noun “Information Saburo” in the secret word table 291 as a new secret word. However, the secret word registration unit 220 may set “B system”, “Information Taro”, “Information Jiro”, and “Information Saburo”, which are not registered as a single secret word, in the secret word table 291 as new secret words. I do not care.
The secret word registration unit 220 sets the same secret level “2” as the secret combination “Information Taro, B system” included in the word list 221 as the secret level of the new secret word “Information Saburo” in the secret word table 291. When a plurality of concealment combinations are included in the word list 221, the concealment word registration unit 220 sets the same concealment level as the concealment combination having the highest concealment level (or the lowest concealment level) as the concealment level of the new concealment word. . However, the secret word registration unit 220 may set an intermediate secret level or a secret level of a randomly selected secret combination as a secret level of a new secret word.

  The document concealment method (document file providing method) and the concealment file generation process (S300) are the same as those in the first embodiment (see FIGS. 8 and 9).

FIGS. 29 and 30 are diagrams illustrating specific examples of the secret file generation process (S300) according to the fourth embodiment.
A specific example of the secret file generation process (S300) in the fourth embodiment will be described with reference to FIGS. 29 and 30. FIG.

As shown in FIG. 29, the document file 139e having the file name “e document” includes five proper nouns “B system”, “mission D”, “information Taro”, “information Jiro”, and “information Saburo”.
The secret file generation unit 250 extracts five proper nouns “B system”, “mission D”, “Information Taro”, “Information Jiro”, and “Information Saburo” from the document file 139e, and sets the extracted five proper nouns. A list 251 is generated.

The secret file generation unit 250 searches the secret word table 291 using each extracted proper noun as a search key, and acquires a secret level associated with the secret word that matches the search key. When there are a plurality of secret levels, the secret file generation unit 250 selects the highest (or lowest) secret level.
The secret file generation unit 250 sets the secret level of each proper noun in the word list 251.

In FIG. 30, the secret file generation unit 250 compares the secret level of each proper noun with the viewer level.
Hereinafter, the proper noun “Information Jiro” whose concealment level is higher than the viewer level is referred to as “confidential target word”.

  The secret file generation unit 250 generates the secret file 252e with the word “Information Jiro” to be concealed in the document file 139e as a hidden character.

In the fourth embodiment, the case where an unregistered word included in the document file 139 is registered as a new secret word when the document file 139 includes a combination of specific secret words has been described.
According to the fourth embodiment, when one secret word is recorded in the document file 139 and the other words recorded in the document file 139 do not need to be concealed, the word included in the document file 139 that does not need to be concealed is concealed. It is possible to prevent registration as a word and concealment.

  The fourth embodiment may be combined with the first to third embodiments as follows, for example.

As in the first embodiment, the document concealment device 200 may also serve as the file server 130, or the concealment word table 291 and the user information table 292 may be stored in the file server 130 or the database device.
Further, words other than proper nouns may be registered in the secret word table 291 as secret words.

  As in the second embodiment, the disclosed word list 293 may be provided, and the secret word may be disclosed without being hidden, regardless of the browsing level of the user, when generating the confidential file.

  As in the third embodiment, a secret type may be provided, and the document file 139 including a specific secret combination and the provision of the secret file may be rejected.

  100 document confidential system, 101 network, 110 user terminal, 111 user terminal control unit, 120 administrator terminal, 121 administrator terminal control unit, 130 file server, 131 file server control unit, 132 file server storage unit, 139 document File, 200 document concealment device, 210 document file registration unit, 220 concealment word registration unit, 221 word list, 230 viewer level acquisition unit, 240 browse file acquisition unit, 250 concealment file generation unit, 251 word list, 252 concealment file, 260 secret file output unit, 290 document secret device storage unit, 291 secret word table, 292 user information table, 293 disclosure word list, 901 CPU, 902 bus, 903 ROM, 904 RAM, 905 communication device, 911 Display, 912 keyboard, 913 mouse, 914 drive device, 920 magnetic disk device, 921 OS, 922 program group, 923 file group.

Claims (17)

A secret word storage unit for storing a secret word to be concealed;
A document file storage unit for storing a document file including a plurality of words;
A specific word included in the document file is extracted from the document file stored in the document file storage unit, and a word that is different from the secret word stored in the secret word storage unit among the extracted words is a new secret word As a secret word registration unit to be stored in the secret word storage unit,
A browsing file acquisition unit that acquires a specific document file as a browsing file from the document file storage unit;
A secret file generating unit that generates a secret file by concealing the same word as the secret word stored in the secret word storage unit among the words included in the browse file acquired by the browse file acquisition unit;
A secret file output unit that outputs the secret file generated by the secret file generation unit ,
The secret word storage unit stores a secret type indicating which of the secret word and the browsing file including the secret word to be secreted in association with each secret word,
The secret word registration unit acquires a secret type of the same secret word as the word extracted from the document file among the secret types stored in the secret word storage unit, and any one of the acquired secret types Is stored in the secret word storage unit as a secret type of the new secret word,
The secret file generation unit acquires a secret type of a secret word that is the same as a word included in the browse file among the secret types stored in the secret word storage unit, and each secret word based on the acquired secret type features and to Rubun manual secret system that the determined one or concealing the browsing files, generating the confidential file when it is determined that concealing the confidential words.   The secret file generation unit is configured to conceal the word by replacing the same secret word stored in the secret word storage unit with a predetermined secret notation among the words included in the browsing file. The document concealment system according to claim 1. 3. The document concealment system according to claim 1, wherein the secret word registration unit extracts words belonging to a predetermined part of speech from the document file. The document concealment system according to claim 3, wherein the secret word registration unit extracts at least one of proper nouns and several nouns from the document file. The document secret system according to claim 1, wherein the secret word registration unit extracts a word including a numerical value and a unit from the document file. The document concealment system further includes:
A disclosure word storage unit for storing disclosed disclosure words;
The secret word registration unit is a word different from the secret word stored in the secret word storage unit and different from the disclosed word stored in the disclosure word storage unit among the words extracted from the document file 6. The document concealment system according to claim 1, wherein the concealment word storage unit is stored as the new concealment word. The secret word storage unit stores a secret combination obtained by combining specific secret words,
The secret word registration unit determines whether the document file includes a combination of the same words as a secret combination stored in the secret word storage unit based on a word extracted from the document file, and the new confidential words to claim 6 claim 1, characterized in that stored in the secret word storage unit when the same combination of words and confidentiality combination is determined to be included in the document file The document concealment system described. The document concealment system further includes:
A user information storage unit for storing the browsing level given to each user;
A browser level acquisition unit that acquires a browsing level given to a specific user as a browser level from the user information storage unit;
The secret word storage unit stores a specific secret level in association with each secret word,
The secret word registration unit selects, as registered words, the same words as the secret words stored in the secret word storage unit among the words extracted from the document file, and sets a secret level of the selected registered words. Acquired from the word storage unit, and stored in the secret word storage unit as a secret level of the new secret word among any of the acquired secret levels,
The secret file generation unit selects the same word as the secret word stored in the secret word storage unit from the words included in the browsing file, and sets a secret level associated with the same secret word as the selected word. The concealment file obtained from the concealment word storage unit, compares the concealment level acquired with the viewer level acquired by the viewer level acquisition unit, conceals words whose concealment level is higher than the viewer level, and stores the concealment file Article concealment system according to any claims 1 to 7, characterized in that to produce a. A secret word storage unit that stores a secret word to be concealed , stores a secret type indicating which of the secret word and a browsing file including the secret word is to be concealed in association with each secret word, and a plurality of secret words A document concealment program that functions a document concealment system comprising a document file storage unit that stores a document file including words,
A specific word included in the document file is extracted from the document file stored in the document file storage unit, and a word that is different from the secret word stored in the secret word storage unit among the extracted words is a new secret word As the secret word storage unit, acquiring the secret type of the same secret word as the word extracted from the document file among the secret types stored in the secret word storage unit, and any of the acquired secret types A secret word registration unit for storing the secret type of the new secret word as a secret type in the secret word storage unit ;
A browsing file acquisition unit that acquires a specific document file as a browsing file from the document file storage unit;
The secret type of the same secret word as the word included in the browse file is acquired from the secret types stored in the secret word storage unit, and each of the secret word and the browse file is acquired based on the acquired secret type. It determines whether concealed, generates each confidential If word is determined that the concealing, before Ki閲 list confidential files concealed the same word as the secret word stored in the secret word storage unit among the words included in the file A secret file generation unit,
A document concealment program that causes the document concealment system to function as a concealment file output unit that outputs a concealment file generated by the concealment file generation unit. The secret file generation unit is configured to conceal the word by replacing the same secret word stored in the secret word storage unit with a predetermined secret notation among the words included in the browsing file. The document concealment program according to claim 9 . The document concealment program according to claim 9 or 10, wherein the secret word registration unit extracts words belonging to a predetermined part of speech from the document file. 12. The document concealment program according to claim 11, wherein the secret word registration unit extracts at least one of a proper noun and a few nouns from the document file. The document concealment program according to claim 9 or 10, wherein the secret word registration unit extracts a word including a numerical value and a unit from the document file. The document concealment system further includes:
A disclosure word storage unit for storing disclosed disclosure words;
The secret word registration unit is a word different from the secret word stored in the secret word storage unit and different from the disclosed word stored in the disclosure word storage unit among the words extracted from the document file Article concealment program according to claims 9 to claim 13, characterized in that stored in the secret word storage unit as a new confidential words said. The secret word storage unit stores a secret combination obtained by combining specific secret words,
The secret word registration unit determines whether the document file includes a combination of the same words as a secret combination stored in the secret word storage unit based on a word extracted from the document file, and the new confidential words to claim 14 claim 9, characterized in that stored in the secret word storage unit when the same combination of words and confidentiality combination is determined to be included in the document file Document confidentiality program. The document concealment system further includes:
A user information storage unit for storing a browsing level given to each user;
The document concealment program is
The document concealment system is made to function as a browser level acquisition unit that acquires from the user information storage unit as a browsing level given to a specific user,
The secret word storage unit stores a specific secret level in association with each secret word,
The secret word registration unit selects, as registered words, the same words as the secret words stored in the secret word storage unit among the words extracted from the document file, and sets a secret level of the selected registered words. Acquired from the word storage unit, and stored in the secret word storage unit as a secret level of the new secret word among any of the acquired secret levels,
The secret file generation unit selects the same word as the secret word stored in the secret word storage unit from the words included in the browsing file, and sets a secret level associated with the same secret word as the selected word. The concealment file obtained from the concealment word storage unit, compares the concealment level acquired with the viewer level acquired by the viewer level acquisition unit, conceals words whose concealment level is higher than the viewer level, and stores the concealment file Article concealment program according to claim 15 claim 9, characterized in that to produce a. A secret word storage unit that stores a secret word to be concealed , stores a secret type indicating which of the secret word and a browsing file including the secret word is to be concealed in association with each secret word, and a plurality of secret words a document confidential process performed by the document confidential system comprising a document file storage unit for storing a document file containing a word,
The secret word registration unit extracts a specific word included in the document file from the document file stored in the document file storage unit, and is different from the secret word stored in the secret word storage unit among the extracted words The word is stored in the secret word storage unit as a new secret word, and the secret type of the same secret word as the word extracted from the document file is acquired and acquired from the secret types stored in the secret word storage unit. One of the secret types is stored in the secret word storage unit as a secret type of the new secret word,
The browsing file acquisition unit acquires a specific document file as a browsing file from the document file storage unit,
The secret file generation unit acquires the secret type of the same secret word as the word contained in the browse file among the secret types stored in the secret word storage unit, and each secret word and the above based on the acquired secret type any of the browsing file determines whether concealed, each confidential when determining to confidential words, concealing the same words as confidential words stored in said secret word storage unit among the words included in prior Ki閲 list file To generate a secret file,
A document concealment method, wherein the concealment file output unit outputs the concealment file generated by the concealment file generation unit.

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