JP4615010B2 - Document management program and document management method - Google Patents

Description

  The present invention relates to a document management program and a document management method, and more particularly to a document management program and a document management method for managing important documents.

In recent years, there is an increasing need to manage electronic documents (hereinafter referred to as “important documents”) in which confidential information such as confidential information and personal information is described. As one of the methods for managing this important document, when an arbitrary document is taken out from the storage where the important document is stored, a method of detecting which important document the arbitrary document refers to is detected. Are known. Examples of this detection method include the methods described in (1) to (3) below.
(1) A method of outputting a save file name as a log when an important document is saved in another storage location.
(2) When an important document is stored in another storage location, a signature (message authentication code or hash code) of the entire document is output as a log (see, for example, Patent Document 1).
(3) A method of saving an important document itself as a backup file when the important document is saved in another storage location.

Hereinafter, these methods (1) to (3) will be specifically described.
In the method (1), the file name of the important document is output as a log, and if the log is analyzed with the saved file name, it is possible to detect when and who brought out the important document from which personal computer. In addition, as the log, a storage date and time, a storage user ID, personal computer specific information, and the like are output.
In the method (2), the signature of the important document is output as a log, and when the signature is analyzed, it is possible to detect when and who brought out the important document from which personal computer.
In the method (3), the important document itself is stored as a backup, and the contents of the backup document and the important document are compared to analyze whether the document is the same document as the important document or a similar document of the important document. It is possible to detect when and who has taken out an important document from which personal computer.
Japanese Patent Laid-Open No. 11-196392

However, the conventional techniques have the following problems.
In the method (1) described above, when the important document is saved in another storage location, if the file name is saved with another file name, the reference important document is not known. That is, even if the log is analyzed, it is impossible to know what document has been taken out.

  In the method (2) described above, in the case of falsification of a part of an important document, extraction of a part, or take-out by addition of a part, the log of this technology outputs only the signature of the entire stored document. It is different from document signature. For this reason, the important document of the reference source is not known. That is, even if the signature is analyzed, it is impossible to know what document has been taken out.

  In the method (3) described above, when the document is saved, the document file at the time of saving is kept as a backup separately from the log. Therefore, if the backup document and the contents of the important document are compared, the backup document and the reference source Identical or similar to important documents can be detected. However, since the entire document is backed up, the capacity required for storage becomes enormous.

  The present invention has been made in view of these points, and saves the entire document even if the file name has been changed, a part of the file has been altered, a part has been cut out, or a part has been added. It is an object of the present invention to provide a document management program and a document management method capable of detecting an original document without doing so.

  In the present invention, in order to solve the above problem, a document management program as shown in FIG. 1 is provided. The document management program according to the present invention is for causing a computer to manage documents. A computer 1 that executes this document management program has log output means 2 and document body detection means 3.

  The log output means 2 receives at least one arbitrary document, for example, Doc (1) from the document storage 4 in which a plurality of documents Doc (1), Doc (2),... Doc (n) are stored. When the document A including a copy is taken out, the document A is divided, and the signatures Sign (1) and Sign (1) in the plurality of divided documents DA (1), DA (2). 2),..., Sign (m) is calculated, and a log including the calculated signatures Sign (1), Sign (2),..., Sign (m) is output to the log storage unit 5.

  When the document body detection unit 3 receives a request to detect the original document of the log stored in the log storage unit 5, the document body detection unit 3 includes a plurality of documents Doc (1), Doc (2),. The signatures of the documents obtained by dividing each Doc (n), for example, the signature DSSign (1), DSSign (2),..., Dsign (j) of Doc (1) and the calculated signature Sign (1), Sign (2),..., Sign (m) are respectively compared, and an original document constituting a part of the document Doc (1) corresponding to the document A at the time of log output is detected according to the result.

  According to the computer that executes such a document management program, when the document A including at least a part of Doc (1) is taken out from the document storage 4, the taken-out document A is divided by the log output unit 2. The signatures Sign (1), Sign (2),..., Sign (m) in the plurality of divided documents DA (1), DA (2). Logs including the signatures Sign (1), Sign (2),..., Sign (m) are output to the log storage unit 5. Thereafter, when a request for detecting the original document of the log is received, the document body detection means 3 uses the signature Sign (1), Sign (2),..., Sign (m) and the signature DSSign ( 1), DSSign (2),..., Dsign (j) are respectively compared, and an original document constituting at least a part of the document Doc (1) corresponding to the document A is detected according to the result. .

  Further, in order to solve the above problem, in the document management method for managing documents, the log output means takes out at least a part of the export document of any document body from the document storage means in which a plurality of document bodies are stored. The document is divided, the signatures in the plurality of divided documents after division are calculated, the log including the calculated signatures is output to a log storage unit, and the document main body detection means When an original document detection request is received, a signature of a document obtained by dividing each of the plurality of document bodies in the document storage unit is compared with a signature included in the log, and the log output is performed according to the result. There is provided a document management method, characterized in that an original document constituting at least a part of the document body corresponding to time is detected.

  According to such a database reorganization method, when at least a part of the export document of any document body is taken out from the document storage unit in which a plurality of document bodies are stored, the export document is divided by the log output unit, Signatures in the plurality of divided documents after division are calculated, and a log including each calculated signature is output to the log storage unit. Thereafter, when receiving a request for detecting the original document of the log, the document body detection unit compares the signature of the document obtained by dividing each of the plurality of document bodies in the document storage unit with the signature included in the log. Based on the result, an original document constituting at least a part of the document body corresponding to the log output time is detected.

  The present invention divides each of a plurality of important documents in the document storage means even if the file name of the export document is different from the file name of the important document or a part of the export document is altered, cut out or added. By comparing the signature of the divided document with the signature included in the log, the original document in the log can be reliably detected without taking a backup of the entire taken-out document. Thereby, it is possible to know the original document of the part corresponding to the exported document from the original file, that is, to know the contents of the exported document.

  These and other objects, features and advantages of the present invention will become apparent from the following description taken in conjunction with the accompanying drawings which illustrate preferred embodiments by way of example of the present invention.

It is a conceptual diagram of the invention applied to this Embodiment. It is a figure which shows the hardware structural example of the computer of this Embodiment. It is a block diagram which shows the function for implement | achieving this Embodiment. It is the figure which showed the program structure of the computer of this Embodiment. It is a figure which shows the item described in the management book in this Embodiment. It is the schematic which shows the division | segmentation file of this Embodiment. It is a figure which shows the relationship between the kind of file, the number of signature preparation divisions, and the number of bytes of a search keyword. It is a flowchart which shows the procedure of management information creation. It is a flowchart which shows the procedure of the detection process of a file detection means. It is a flowchart which shows the procedure of the detection process of a file detection means. It is a flowchart which shows the procedure of a detection process routine. It is a flowchart which shows the procedure of a detection process routine. It is a figure which shows the relationship between the kind of file of the modification 4, the number of signature preparation divisions, and the number of bytes of a search keyword.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
First, the outline of the invention applied to the embodiment will be described, and then the specific contents of the embodiment will be described.

  FIG. 1 is a conceptual diagram of the invention applied to the embodiment. The document management program according to the present embodiment can cause a computer to execute the following processing. At this time, the computer 1 functions as a document management apparatus.

The document registration unit 7 registers a document (hereinafter referred to as “important document”) in which confidential information such as confidential information and personal information is stored in the document storage 4.
The document storage 4 is provided for storing a plurality of important documents Doc (1), Doc (2),... Doc (n). The important documents Doc (1), Doc (2),..., Doc (n) can be updated and stored only by an administrator with special authority.

  The document take-out means 6 takes out the document A in which the content is the same as or important for the important document, the file name is changed, the content is partially altered, the content is partially cut out, and the content is added to the important document. This is for storage in a place other than the storage 4. FIG. 1 shows a case where the document A stored in the document storage 4 is taken out by the document take-out means 6 and stored in the medium M outside the computer 1.

  The log output means 2 is a means for taking out document A from document storage 4 storing important documents Doc (1), Doc (2),... Doc (n) registered by document registration means 7. 6, signatures Sign (1), Sign (2) in a plurality of divided documents DA (1), DA (2),..., DA (m) obtained by dividing the taken-out document A,. Calculate Sign (m), respectively. In addition, the log output unit 2 outputs a log including the calculated signatures Sign (1), Sign (2),..., Sign (m) to the log storage unit 5.

  When the document body detection unit 3 receives a request to detect the original document of the document A, the document body detection unit 3 divides the signature Sign (1), Sign (2),..., Sign (m) and the important document Doc (1). The signatures DSSign (1), DSSign (2),..., DSSign (j) are compared with each other to detect the important document Doc (1) from which the document A is taken out.

  According to such a document management apparatus, when the document A is taken out from the document storage 4 to the document take-out means 6, the divided documents DA (1), DA (2). The signatures Sign (1), Sign (2),..., Sign (m) in DA (m) are respectively calculated. Further, the log output means 2 outputs a log including the calculated signatures Sign (1), Sign (2),..., Sign (m) to the log storage unit 5.

  Thereafter, when a request for detecting the original document of the log is received, the document body detection means 3 uses the signature Sign (1), Sign (2),..., Sign (m) and the signature DSSign ( 1), DSSign (2),..., Dsign (j) are respectively compared, and an original document constituting at least a part of the important document corresponding to the document A at the time of log output is detected according to the result. The

  In this way, by using the signature, even if the file name of the document A is different from the file name of the important document, or a part of the document A is altered, cut out or added, the entire document A is backed up. It is possible to easily and reliably detect an important document from which the document A is taken out without taking it. Thereby, the contents of the extracted document can be known.

Hereinafter, embodiments of the present invention will be specifically described.
FIG. 2 is a diagram illustrating a hardware configuration example of the computer according to the present embodiment. The document management program and the document management method according to the embodiment of this invention are realized by the computer 100.

The computer 100 has the following hardware configuration.
The entire computer 100 is controlled by a CPU (Central Processing Unit) 101. A random access memory (RAM) 102, a hard disk drive (HDD) 103, a graphic processing device 104, an input interface 105, and a drive 106 are connected to the CPU 101 via a bus 101a.

  The RAM 102 temporarily stores at least part of an OS (Operating System) program and application programs to be executed by the CPU 101. The RAM 102 stores various data necessary for processing by the CPU 101. The HDD 103 stores an OS, application programs, and the like.

  A monitor 11 is connected to the graphic processing device 104. The graphic processing device 104 displays an image on the screen of the monitor 11 in accordance with a command from the CPU 101. A keyboard 12 and a mouse 13 are connected to the input interface 105. The input interface 105 transmits a signal sent from the keyboard 12 or the mouse 13 to the CPU 101 via the bus 101a.

The drive 106 reads data from the medium M and writes data to the medium M.
With the hardware configuration as described above, the processing functions of the present embodiment can be realized.

Hereinafter, the processing of the present embodiment in the system having the configuration shown in FIG. 2 will be described in detail.
FIG. 3 is a block diagram showing functions for realizing the present embodiment.

  The computer 100 includes an original file storage unit 110 that stores a plurality of original files (text files), a file system 120 that manages data stored in the original file storage unit 110, and an original file storage unit 110 via the file system 120. A file input / output unit 130 for inputting an original file into the file and outputting an original file from the original file storage unit 110, input of a file from the original file storage unit 110 to the file input / output unit 130, and input from the file input / output unit 130 A file input / output monitoring unit 140 that monitors file output, a management information creation unit 150 that creates file management information, a management list storage unit 160 that stores a management list 161 for managing management information, and a file detection unit 170 Have.

The original file storage unit 110 is a storage unit that stores an original file of electronic data to be managed.
The file input / output unit 130 generates a file including a part or all of the original file (hereinafter referred to as “export file”) in response to a request, and moves or copies it to an external medium (storage device) M.

Hereinafter, outputting an original file from the original file storage unit 110 to the file input / output unit 130 is referred to as “taking out the original file”.
The input / output monitoring unit 140 copies the export file to the management information creation unit 150 when the original file is taken out.

The management information creation unit 150 creates management information (log) from the export file received from the input / output monitoring unit 140 and stores the management information in the management list storage unit 160.
The file detection unit 170 detects the original file that is the source of the export file by using the management book stored in the management book storage unit 160 and the original file stored in the original file storage unit 110. Further, the file detection unit 170 outputs the detection result to the monitor 11.

The detection operation (action) of the file detection unit 170 will be described in detail later.
Next, the relationship between the file input / output monitoring unit and programs such as the OS and applications will be described.

FIG. 4 is a diagram showing a program configuration of the computer according to the present embodiment. The same parts as those in FIG.
The file input / output monitoring unit 140 according to the present invention operates integrally with an OS 190 provided by the system. When the document management program is activated, when the original file stored in the original file storage unit 110 is carried out to the file input / output unit 130, the original file is taken out by the OS 190 at the same time. The input / output monitoring unit 140 copies the export file to the management information creation unit 150.

Next, the management book 161 stored in the management book storage unit 160 will be described.
FIG. 5 is a diagram showing items described in the management book 161 in the present embodiment. The management list 161 describes management information created when the original file is taken out. This management information includes history information 162 and signature information 163.

  The history information 162 includes “output date” indicating the date when the file was saved, “output hour / minute / second” indicating the hour / minute / second when the file was saved, and “machine name” indicating the name of the computer that saved the file. "IP address" indicating the IP (Internet Protocol) address of the computer that saved the file, "MAC address" indicating the MAC (Media Access Control) address of the computer that saved the file, on the computer that saved the file The “user name” indicating the log-in ID, “file name” indicating the name of the saved file, and “file size” indicating the size (in bytes) of the saved file.

  The signature information 163 includes an “overall signature” indicating the signature of the entire saved file, a “signature creation division number” indicating the number of divisions of the file, and one division of the divided file (hereinafter referred to as “division file”). “Search keyword” indicating a keyword from which words, phrases, or sentences for the first K bytes (K is a positive real number) are extracted, “number of bytes to be signed” indicating the number of bytes per divided file of a divided file, It consists of an item “divided signature” indicating the signature of the divided file.

The K bytes of the search keyword will be described later in detail.
The search keyword, the number of signature target bytes, and the divided signature are created for each divided file and stored in the management list 161.

Such signature information 163 is created by a signature information creation operation. The signature information creation operation will be described in detail later.
Next, a specific example of the signature information 163 will be described.

  FIG. 6 is a schematic diagram showing a divided file according to the present embodiment. FIG. 6 shows an example in which the export file A1 is divided into three divided files DA (1), DA (2), and DA (3) as an example.

  The overall signature AS (1) is a signature of the entire export file A1. This signature is created by using, for example, a HASH function or the like for the export file A (1). “AS (1)” is described in the data content of the “whole signature” in the management book.

Since the signature creation division number is 3, “3” is described in the data content of “signature creation division number” in the management list.
As a search keyword, a common part of each divided file is extracted. In FIG. 6, K bytes of search keywords are extracted from the top in each divided document. The search keyword corresponding to each of the divided files DA (1), DA (2), and DA (3) is described in the data content of “search keyword” in the management list.

In addition, the data content of “number of bytes to be signed” in the management list describes the number of bytes of each of the divided files DA (1), DA (2), and DA (3).
The divided signatures DS (1), DS (2), DS (3) are created by using, for example, a HASH function or the like for each of the divided files DA (1), DA (2), DA (3). In the example illustrated in FIG. 6, “DS (1)”, “DS (2)”, and “DS (3)” are described in the data content of “division signature” in the management list.

Next, a method for calculating the signature creation division number and the number of bytes of the search keyword will be described.
FIG. 7 is a diagram showing the relationship among the file type, the signature creation division number, and the number of bytes of the search keyword.

  In this embodiment, as shown in FIG. 7, “file type” (for example, resume, approval document, customer list, etc.), “signature creation division number”, and “byte number of search keyword” are described in advance. The number of signature creation divisions and the search keyword are obtained using the comparison table. This comparison table is stored in advance in the HDD 103.

The comparison table may be stored in an external file (not shown) and read when the document management program is started or when a divided file is divided.
Further, the number of bytes of the search keyword may be calculated using a calculation formula, or may be calculated using a calibration curve or the like.

  The determination of which “file type” the export file corresponds to is, for example, a method of determining from the extension of the original file, or a classification in which characteristics such as resumes, approval documents and customer lists are defined separately. For example, a method of preparing a table and making a decision with reference to the classification table may be used.

Next, the signature information creation operation will be described.
FIG. 8 is a flowchart showing a procedure for creating signature information. In the following, the process illustrated in FIG. 8 will be described in order of step number.

When the original file is taken out, the management information creation unit 150 acquires the carry-out file from the input / output monitoring unit 140 (step S11).
Next, a signature for the entire export file is created (step S12).

  Then, referring to the comparison table, the total number of bytes of the export file is divided by the number of signature creation divisions corresponding to the type of export file to calculate the number of signature target bytes of each division file (step S13).

Next, the total number of bytes of the export file is set as the number of unsigned bytes (step S14).
Thereafter, it is determined whether there is a divided file for which a divided signature has not been created (step S15). If there is a split file for which a split signature has not been created (Yes in step S15), files corresponding to the number of bytes to be signed are read from the export file (step S16).

  Next, the file read in step S16 is set as a divided file for the current process, and the number of bytes of the divided file is held in the RAM 102 as the number of signature target bytes for the current process (step S17).

Then, K bytes from the beginning of the divided file of the current process are used as a search keyword for the current process and are stored in the RAM 102 (step S18).
Next, a divided signature is created from the divided file of the current process and held in the RAM 102 (step S19).

  Thereafter, the number of bytes to be signed in the current split file is subtracted from the number of unsigned bytes, and the value is set as a new number of unsigned bytes (step S20). Thereafter, the process returns to step S15.

  On the other hand, if there is no divided file for which no divided signature has been created in step S15 (if a divided signature has been created for all the divided files) (No in step S15), various signatures held in the RAM 102 are stored. The information and the separately created history information are output to the management book storage unit 160 (step S21), and the signature information creation operation is terminated.

Next, the detection operation (action) by the file detection means will be described.
9 and 10 are flowcharts showing the procedure of the detection operation of the file detection means. In the following, the process illustrated in FIGS. 9 and 10 will be described in order of step number.

First, the management list 161 of the carry-out file to be detected is extracted from the management list storage unit 160, and management information is acquired (step S31).
Next, the output date and time of the export file (hereinafter referred to as “nDate”) is acquired from the history information in the management information (step S32).

  Next, referring to the comparison table, the last update date (hereinafter referred to as “oDate”) of one original file (hereinafter referred to as “original file of this time”) of the original files corresponding to the export file is acquired (hereinafter referred to as “oDate”) ( Step S33).

Then, it is determined whether nDate is a date and time after oDate (step S34).
When nDate is a date and time before oDate (No in step S34), the export file is not determined to be a derived file of the original file of this time, and the process returns to step S31.

  On the other hand, when nDate is the date and time after oDate (Yes in Step S34), the file size of the export file (hereinafter referred to as “nSize”) is acquired from the history information (Step S35).

  The narrowing down of the export files to be processed by the detection operation of the file detection means 170 by the update date comparison from step S32 to step S35 is adopted only when processing is simply performed (simple search processing). It is also preferable that the configuration is not adopted when all cases are desired (all cases search processing). In this case, before the step S31, based on input information (not shown) that makes it possible to selectively identify the simple search process and the all-case search process, the process branches after identifying which process is selected. What is necessary is just to comprise.

Next, the file size of the original file (hereinafter referred to as “oSize”) is acquired (step S36).
Next, it is determined whether nSize is equal to oSize (step S37).

If nSize and oSize are not equal (No in step S37), the process proceeds to a detection processing routine (step S38).
After returning from the detection processing routine, the process proceeds to step S43.

  On the other hand, if nSize and oSize are equal (Yes in step S37), the signature of the entire export file (hereinafter referred to as “nSign”) is acquired from the management information (step S39).

Next, a signature of the entire original file (hereinafter referred to as “oSign”) is created (step S40).
Then, it is determined whether or not nSign and oSign are equal (step S41).

If nSign and oSign are not equal (No in step S41), the process proceeds to a detection processing routine (step S38).
On the other hand, if nSign and oSign are equal (Yes in step S41), the carry-out file is regarded as a derivative file of the current original file, and the history information and management information are output as original file information (step S42).

Next, it is determined whether or not there is an original file whose signature has not been compared with the export file (step S43).
If there is an original file whose signature has not been compared with the export file (No in step S43), the process returns to step S31 and the detection operation is continued.
On the other hand, if there is no original file that has not been compared with the export file (Yes in step S43), the detection operation is terminated.

In the present embodiment, the time for the detection operation can be shortened by performing steps S31 to S34, step S37, and steps S39 to S42.
In this embodiment, when there is no original file whose signature has not been compared with the export file, that is, the signature of the export file is compared with the signatures of all the original files obtained by referring to the comparison table. However, the detection operation is not limited to this, and if the export file is regarded as a derivative file of the original file, the detection operation is terminated even if there is an original file whose signature has not been compared with the export file. May be.

11 and 12 are flowcharts showing the procedure of the detection processing routine. In the following, the process illustrated in FIGS. 11 and 12 will be described in order of step number.
First, the number of signature creation divisions (hereinafter referred to as “hMax”) is acquired from the management information (step S51).

Next, the value of the signature creation division number counter (hereinafter referred to as “hCnt”) is set to 1 (step S52).
Next, it is determined whether hCnt and hMax are equal (step S53).

When hCnt and hMax are not equal (No in step S53), a search keyword is acquired from the management information (step S54).
Next, the original file is searched with the acquired search keyword (step S55).

Then, it is determined whether or not there is a portion where the search keyword is hit in the original file (step S56).
If the search keyword does not hit the original file (No in step S56), the value (M) of the mismatch register stored in the RAM 102 is incremented (step S57), and the process proceeds to step S64.

On the other hand, if the search keyword hits the original file (Yes in step S56), the number of signature target bytes is acquired from the management information (step S58).
Next, a division signature is acquired from the management information (step S59).

  Next, a file for the number of signature target bytes acquired in step S58 is acquired from the head position of the search keyword included in the original file, and a signature for this file is created (step S60).

Then, it is determined whether or not the divided signature acquired in step S59 matches the signature created in step S60 (step S61).
If the divided signature and the signature created in the original file do not match (No in step S61), the next position of the search keyword hit last time in the divided file is confirmed (step S62), and the process returns to step S56.

  On the other hand, if the divided signature and the signature created by the original file match (Yes in step S61), the value (N) of the match register stored in the RAM 102 is incremented (step S63).

Next, hcnt is incremented (step S64), and the process returns to step S53.
Then, these steps S53 to S64 are repeated for the number of signature generation divisions, and when hCnt and hMax are equal (Yes in step S53), the match register value (N) and the mismatch register value (M) are used. Then, the similarity L = N / (N + M) is obtained (step S65).
Next, the similarity L is compared with a preset similarity threshold LL (step S66).

  When L <LL (No in step S66), the next original file is read without considering the export file as a derivative file of the original file (step S67), and the process returns to step S53, and the read original file is processed. The same operation as described above is performed.

  On the other hand, when L ≧ LL (Yes in step S66), the export file is regarded as a derivative file of the original file, and each item of management information is displayed on the monitor 11 via the graphic processing device 104.

  As described above, in the present embodiment, an export file in which one or more of file name change, partial file content alteration, partial file cutout, and file content addition is carried out is taken out. In addition, the management information creation unit 150 creates management information from the export file received from the input / output monitoring unit 140, creates a search keyword for the export file in the original file and a signature of the hit part, and the signature and export of this part By comparing the divided signature of the file, the corresponding original file can be detected from the export file. Thereby, since the original document of the part corresponding to the taken-out document can be known from the original file, the contents of the extracted document can be known.

In addition, since it is not necessary to take a backup of the entire export file, an increase in storage capacity can be prevented.
In this embodiment, the detection operation is performed on the original file corresponding to the file described in the management book. However, the present invention is not limited to this. For example, the detection operation may be performed on all the original files. Good.

  By the way, in the present embodiment, the signature creation division number of the export file and the number of bytes of the search keyword are determined using the comparison table. However, the present invention is not limited to this, and the following modifications may be used.

(Modification 1)
The administrator determines the number of signature generation divisions and the number of bytes of the search keyword in advance, for example, the number of signature generation divisions is 100 and the number of search keyword bytes is 8 bytes.

(Modification 2)
Regardless of the type of the original file, the number of signature creation divisions and the number of bytes of the search keyword are determined in proportion. This percentage may simply be a percentage or may be based on other percentage calculations. However, since the number of bytes of the search keyword may become an extremely small value or a large value depending on the capacity of the file, each limit value is determined. This is determined by the type and size of the original file and stored in the HDD 103 or in an external file.

When determining the number of bytes of a search keyword based on the ratio, first, the number of signature creation divisions is determined. Then, it is confirmed whether or not the number of signature generation divisions is within a limit value.
For example, when dividing the export file into 100, if the minimum number of bytes per division is 64 bytes (assuming about one line), the result of dividing the number of bytes of the original file by the number of signature creation divisions is 63 bytes or less In this case, the division file per division is set to 64 bytes, and the signature creation division number is changed. In this case, the signature creation division number is obtained by the number of bytes of the original file / 64. Also, if the maximum number of bytes per division is 4096 bytes (assuming about 1/2 page), if the result of dividing the number of bytes of the original file by the number of signature creation divisions is 4097 bytes or more, per division The divided file is set to 4096 bytes, and the signature creation division number is changed. The number of divisions in this case is obtained by the number of bytes of the original file / 4096.

When the number of signature creation divisions is determined, the ratio of search keywords is determined next. Then, it is confirmed whether or not the ratio of the search keyword is applicable to the divided file.
For example, assuming that the percentage of the number of bytes of the search keyword with respect to the number of bytes to be signed is a%, the number of bytes of the search keyword is obtained by (number of bytes of divided file) / (number of divisions for signature creation) × (a / 100). It is done.

  As a result, for example, when the search keyword is 7 bytes or less, the search keyword is 8 bytes. When the search keyword is 129 bytes or more, the search keyword is set to 128 bytes.

(Modification 3)
Based on the information of each original file, the number of signature creation divisions and the number of bytes of the search keyword are determined.

(Modification 4)
FIG. 13 is a diagram illustrating a relationship among the file type, the signature creation division number, and the number of bytes of the search keyword according to the fourth modification.

  In the modified example 4, the method using the comparison table described in the embodiment and the modified examples 1 to 3 are combined. For example, referring to the comparison table, if the original file is a resume, the signature creation division number is 5 and the search keyword is 16, and if the original file is an approval document, the signature creation division is performed as described in the second modification. Number and the number of bytes of search keyword.

  The above processing functions can be realized by a computer. In that case, a program describing the processing contents of the functions that the computer should have is provided. By executing the program on a computer, the above processing functions are realized on the computer. The program describing the processing contents can be recorded on a computer-readable recording medium. Examples of the computer-readable recording medium include a magnetic recording device, an optical disk, a magneto-optical recording medium, and a semiconductor memory. Examples of the magnetic recording device include a hard disk device (HDD), a flexible disk (FD), and a magnetic tape. Examples of the optical disc include a DVD (Digital Versatile Disc), a DVD-RAM (Random Access Memory), a CD-ROM (Compact Disc Read Only Memory), and a CD-R (Recordable) / RW (ReWritable). Magneto-optical recording media include MO (Magneto-Optical disk).

  When distributing the program, for example, portable recording media such as a DVD and a CD-ROM in which the program is recorded are sold. It is also possible to store the program in a storage device of a server computer and transfer the program from the server computer to another computer via a network.

  The computer that executes the program stores, for example, the program recorded on the portable recording medium or the program transferred from the server computer in its own storage device. Then, the computer reads the program from its own storage device and executes processing according to the program. The computer can also read the program directly from the portable recording medium and execute processing according to the program. In addition, each time the program is transferred from the server computer, the computer can sequentially execute processing according to the received program.

  The above merely illustrates the principle of the present invention. In addition, many modifications and changes can be made by those skilled in the art, and the present invention is not limited to the precise configuration and application shown and described above, and all corresponding modifications and equivalents may be And the equivalents thereof are considered to be within the scope of the invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Computer 2 Log output means 3 Document main body detection means 4 Document storage 5 Log storage part 100 Computer 110 Original file storage part 150 Management information creation means 160 Management book storage part 170 File detection means Doc (1), Doc (2) Doc (n) Important document DA (1), DA (2), DA (3)..., DA (m) Divided document Sign (1), Sign (2),. ) Signature DSign (1), DSign (2), ..., Dsign (j) Signature

Claims (5)

In a document management program that allows a computer to manage documents,
The computer,
When an export document including at least a part of an arbitrary document body is taken out from a document storage means in which a plurality of document bodies are stored, the document is divided, and signatures are calculated for each of the divided documents after the division. Log output means for setting a part of the divided document as a search keyword for each divided document and outputting a log including the calculated signature and the search keyword to a log storage unit;
When receiving the request for detecting the original document of the log, the document main body including the search keyword is searched from the document storage means, and if the search keyword is included in the document main body, the signature of the document obtained by dividing each of the plurality of document body including the search keyword, the signature and the divided document containing the search keyword included in the log, respectively compared, at said logging according to the result A document body detection means for detecting an original document constituting at least a part of the document body corresponding to the exported document;
Document management program characterized by functioning as   2. The document body in which each signature of a document obtained by dividing the document body and each signature included in the log match at a predetermined position or more is detected as an original document of the log of the document body. Document management program described. The document body detection unit obtains a separate search keyword when the search keyword is not included in the document body, and retrieves the document body including the search keyword from the document storage unit. The document management program according to claim 1, wherein the document management program is repeated a predetermined number of times until the search keyword included in the document body is found. The log output means outputs a log including the number of bytes of each divided document and the divided signature created for each divided document;
The document body detection unit searches the document storage unit for a document body including the search keyword, and if the search keyword is included in the document body, the search of the document body from the number of bytes of the divided document. to identify the area including the keyword to create a signature of said areas, and the divided signature search keywords included in the document body, claims 1, wherein the comparing the signature of the areas 3 Document management program according to any one of the above. In a document management method for managing documents,
The log output means divides the document when at least a part of the export document of the arbitrary document body is taken out from the document storage means in which the plurality of document bodies are stored, and the signatures in the divided document after the division are obtained. And for each of the divided documents, a part of the divided document is used as a search keyword, and a log including the calculated signature and the search keyword is output to a log storage unit,
When the document body detection unit receives a request to detect the original document in the log, the document body including the search keyword is searched from the document storage unit, and if the search keyword is included in the document body, The signature of the document obtained by dividing each of the plurality of document bodies including the search keyword in the document storage unit is compared with the signature of the divided document including the search keyword included in the log, and according to the result. Detecting an original document constituting at least a part of the document body corresponding to the log output time,
A document management method characterized by the above.

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