JP4848863B2 - Time certificate acquisition system, time certificate acquisition device, and time certificate acquisition program - Google Patents

Description

  The present invention relates to a technique for acquiring a time certificate.

  The e-document law was enacted in April 2005 together with the Personal Information Protection Law, and electronic seal stamp systems and the like for the purpose of proof of the existence of digitized documents have been in the spotlight. As one of the electronic seal stamp systems, there is a time certificate issuing system that proves the existence time of an electronic document. In this system, the time certificate is embedded by embedding the time certificate in each electronic document. Prove that it existed in

As an example of the time certificate issuing system, the client-side electronic document creation terminal device is based on the electronic document reading means for reading the electronic document (digitized document) created by the electronic document creation software, and the read electronic document, Digest value calculation means for calculating a digest value including a hash value that is a one-way function value; transmission means for associating the digest value with the ID number of the client-side electronic document creation terminal device; Receiving means for receiving an electronic certificate returned by adding a reception time and an electronic signature to the digest value received by the external institution apparatus and the ID number of the client side electronic document creation terminal apparatus. And the received electronic certificate is sent to the client-side electronic document creation terminal. Electronic certificate insertion writing means for writing against pump target electronic document, there is a time stamping system having a city (e.g., see Patent Document 1).
JP 2003-244139 A

  As described above, in Patent Document 1, an electronic certificate (time certificate) is issued for each electronic document, and this electronic certificate is written for each electronic document. It can be proved that it existed at the time of issue.

  In the e-document method, it is stipulated that a time certificate as described above is acquired within a predetermined period when a paper document is read by a scanner and converted into an electronic document.

  However, even when a paper document is read by a scanner, it may be forgotten to obtain a time certificate and a predetermined period may elapse. In such a case, it is necessary to read the paper document again. However, at that point in time, the paper document may already be disposed, and the reading may not be performed again.

  In particular, when acquiring time certificates for a plurality of electronic documents, if the time certificate is acquired each time a single paper document is read by the scanner, the work becomes complicated and the burden increases. In some cases, a time certificate is obtained collectively after reading a certain number of paper documents. In such a case, there arises a problem that a predetermined period in which the time certificate must be acquired has elapsed or that the time certificate is forgotten to be acquired.

  The present invention has been made in view of the above-described prior art, and when acquiring a time certificate for an electronic document, it is possible to prevent a period during which the time certificate must be acquired from elapses. It is an object of the present invention to provide a time certification system and a time certification method that can prevent a time certificate from being acquired.

  In order to achieve the above object, a time proof acquisition system or a time proof acquisition device for an electronic document file according to claim 1 and claim 5 includes: an electronic document generation unit that reads an original and generates an electronic document; An electronic time storage means for storing an electronic time when the electronic document was generated by the electronic document generation means; a time certificate acquisition means for acquiring a time certificate to be given to the electronic document; A warning unit that issues a warning prompting the acquisition of the time certificate by the time certificate acquisition unit when a predetermined period has elapsed from the electronic time without the time certificate being granted. And

  In order to achieve the above object, a time proof acquisition system or time proof acquisition device for an electronic document file according to claim 2 and claim 6 is an electronic document that generates a digitalized document by reading a plurality of originals. A generating unit; an electronic time storage unit that stores an electronic time when the electronic document is generated by the electronic document generating unit; and an electronic document file that includes a plurality of the electronic documents. A time certificate acquisition means for acquiring one time certificate, and when the predetermined time has elapsed from the digitized time without being given the time certificate, the time certificate acquisition means And a warning means for issuing a warning prompting acquisition.

  To achieve the above object, a time proof acquisition system or time proof acquisition device for an electronic document file according to claim 3 and claim 7 is an electronic document generation means for reading an original and generating an electronic document. Electronic time storage means for storing the electronic time when the electronic document was generated by the electronic document generation means, and time certificate acquisition means for acquiring a time certificate to be given to the electronic document And when the predetermined time has passed since the digitization time without being granted, the time certificate is obtained by the time certificate obtaining means, and the time certificate is given to the digitized document. And a time certificate giving means.

  Furthermore, the time certificate acquisition means according to claim 1 or claim 2, claim 5 or claim 6, as described in claim 4 and claim 8, until the time certificate acquisition instruction is received. The certificate is not acquired.

Meanwhile, in order to achieve the above object, time certification acquisition program according to claim 9 causes a computer, and an electronic document generation step of generating an electronic document reading et allowed to means reading the document, the electronic document An electronic time storage step for storing the electronic time at which the electronic document was generated in the generation step in a storage means; a time certificate acquisition step for acquiring a time certificate to be given to the electronic document; and the time certification If the writing has elapsed a predetermined time from the electronic time without being granted, characterized in that to execute a warning step of warning of warning to prompt the acquisition of the time certificate.

In order to achieve the above object, time certification acquisition program according to claim 10, the computer, and an electronic document generation step of generating an electronic document reading et allowed the reading means a plurality of originals, the electronic An electronic time storage step of storing in the storage means the electronic time at which the electronic document was generated in the electronic document generation step , and one time certificate to be given to the electronic document file comprising the plurality of electronic documents run and the time the certificate obtaining step of obtaining writing, when the time certificate has elapsed a predetermined time from the electronic time without being granted, and a warning step of warning to prompt the acquisition of the time certificate It is characterized by making it.

Further, to attain the object mentioned above, time certification acquisition program according to claim 11, the computer, and an electronic document generation step of generating an electronic document reading et allowed to means reading the document, the electronic document and electronic time storage step of causing storing electronic time the electronic document is generated in the generation step in storage means, time certificate to the electronic document has passed a predetermined time period from the electronic time without being granted In the case, the time certificate is acquired, and the time certificate granting step of granting the time certificate to the digitized document is executed .

  Furthermore, the time certificate acquisition step according to claim 9 or claim 10 is characterized in that, as described in claim 12, the time certificate acquisition is not performed until there is an instruction to acquire the time certificate. .

  According to the first, fifth, and ninth aspects of the present invention, when a time certificate is acquired for an electronic document, it is prevented that a period during which the time certificate must be acquired elapses. be able to.

  According to the inventions according to claim 2, claim 6, and claim 10, it is possible to prevent a period during which a time certificate must be acquired from elapses, and a plurality of the electronic documents. By assigning one time certificate to the digitized document file consisting of the above, the number of time certificate acquisitions or the acquisition cost can be reduced.

  According to the inventions according to claim 3, claim 7 and claim 11, a time certificate is given to the digitized document when a predetermined period has elapsed from the digitization time without being given a time certificate. By doing so, it is possible to prevent the time certificate from being acquired.

  Furthermore, according to the inventions according to claim 4, claim 8, and claim 12, the number of times the time certificate is acquired by preventing the time certificate acquisition process from being performed until the operator gives an instruction. Or acquisition cost can be reduced.

<Embodiment>
Embodiments according to the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a configuration of a time certification system 1 according to the present embodiment.

  The time certification system 1 according to the present embodiment is a computerized document management system connected to a plurality of scanners 2A, 2B,..., 2N (hereinafter collectively referred to as a scanner 2) via a LAN (Local Area Network) 3. A server 10, a LAN 3, a gateway (not shown), and a time certificate issuing authority 5 connected via the Internet 4 are provided.

  Here, the scanner 2 is an apparatus that optically reads a paper document and creates an electronic document, and transmits the electronic document created by each scanner to the electronic document management server 10 via the LAN 3.

  The digitized document management server 10 stores the digitized document D transmitted from the scanner 2 in the digitized document file F by the processing described later, and then gives a time certificate to the digitized document file F. ing. The computerized document management server 10 stores the computerized document D in the computerized document file F and converts it into a document format having a falsification prevention function or converts it into a reusable document format. Since these are known techniques, their description is omitted.

  Here, the outline of the processing in the present embodiment will be described with reference to FIG.

  The digitized document file F stores digitized documents D1, D2... DN (N is an integer), and the digitized documents D1 to DN of the digitized document file F are respectively hashed using a hash value function. A value is obtained, and the hash value list L is generated by listing the hash values. Then, a new hash value is obtained from each hash value in the hash value list L using a hash value function, and this new hash value is set as a message digest M. Further, the time certificate TP, the hash value list L, and the message digest M issued from the time certificate issuing authority 5 are encrypted using a predetermined encryption key 16A, and the encrypted data is stored in the registration information R, And is added to the digitized document file F.

  Next, the structure of the digitized document file F will be described with reference to FIG.

  The digitized document file F includes a file header FH, a document part FM, and a file trailer FT, and the document part FM stores digitized documents D1, D2, and D3 (for example, three).

  The file header FH includes an electronic documentization time for each electronic document D, a document name, a version of the electronic document file, creator information, a fixation flag indicating whether or not the document is fixed, a trailer offset, and a document offset. Stores tables and the like. This electronic documenting time is information indicating the time when the electronic document is created by the scanner 2. The document name is created by the operator inputting arbitrary characters and numbers from an operation unit (not shown), or automatically creating arbitrary characters and numbers. The creator information includes information such as a mail address of the creator of the digitized document. The immobilization flag indicates whether document registration in the digitized document file F is possible / prohibited. When this flag is set, writing / deletion of the digitized document D is prohibited, and the digitized document D Only references to are allowed. Also, registration information R is stored in the file trailer FT.

Even when a new digitized document file F is created by an operation from the scanner 2 connected to the digitized document management server 10 or an operation of the digitized document management server 10 itself, it is formed in this structure. The version and creator of the digitized document file in the file head FH may be automatically given by manual input by the operator or the AP address of the scanner 2.
<1. Configuration of Electronic Document Management Server 10>
FIG. 4 is a block diagram showing a functional configuration of the digitized document management server 10. The electronic document management server 10 includes a control unit 11, a storage unit 12, a transmission / reception unit 13, a hash value list generation unit 14, a message digest generation unit 15, a time certificate acquisition management unit 16, an encryption unit 17, an insertion unit 18, A decoding unit 19 and a tampering detection unit 20 are provided.

  The control unit 11 includes an arithmetic device such as a CPU (Central Processing Unit) and various memories such as a ROM (Read Only Memory) and a RAM (Random Access Memory) (none of which are shown). The operations of each part of the electronic document management server 10 are controlled by executing various programs stored in the computer.

  The storage unit 12 includes a main storage device such as an HDD (Hard Disk Drive) and a nonvolatile memory. The main storage device stores an electronic document file F, registration information R corresponding to the electronic document file F, and the like, and a non-volatile memory temporarily stores a hash value list L, a message digest M, and the like. .

  The transmission / reception unit 13 exchanges data with each scanner 2 via the LAN 3 and is connected to the time certificate issuing authority 5 via the LAN 3 and the Internet 4. Send and receive data at.

  The hash value list generation unit 14 passes the data of the digitized document D through a hash value function (for example, “SHA-1”, “MD5”), and generates a hash value as a result. A hash value list L shown in FIG. 2 is generated by calculating a hash value for each electronic document D and listing them together with document names as document specifying information, and temporarily stored in the nonvolatile memory of the storage unit 12. To remember. Since the hash value function is a one-way function, it is impossible to estimate the original text from the generated hash value.

  The message digest generation unit 15 sums the hash values of the hash value list L generated by the hash value list generation unit 14, obtains a hash value using a hash value function for the total value, and obtains the hash value as a message. The digest M is temporarily stored in the nonvolatile memory of the storage unit 12.

  The time certificate acquisition management unit 16 requests a time certificate request from the time certificate issuing authority 5 via the transmission / reception unit 13 according to an instruction from the operator, and acquires the time certificate TP from the time certificate issuing authority 5. To do.

  In addition, the time certificate acquisition management unit 16 notifies the operator if the registration information R is not given to the digitized document file F even after a predetermined period has elapsed since the digitization time stored in the file header FH. A warning prompting to obtain the time certificate TP is issued. The warning is sent to the operator by e-mail a document that the acquisition of the time certificate TP of the digitized document has not been completed, or on a display unit (not shown) installed along with the scanner 2. This is done by displaying. The mail address of the operator is specified based on the creator information stored in the file header FH. It should be noted that a predetermined period from the electronic documenting time until the warning is issued is set in advance by an administrator having predetermined authority or can be arbitrarily set by the operator.

  Further, the time certification system may automatically request a time certificate request from the time certificate issuing authority 5 via the transmission / reception unit 13 and obtain the time certificate TP from the time certificate issuing authority 5. . In that case, the time certificate TP may be automatically acquired after a predetermined number of digitized documents D are created in the storage unit 12 or when a predetermined period of time has elapsed from the digital documenting time.

  The encryption unit 17 encrypts the time certificate TP acquired by the time certificate acquisition management unit 16, the hash value list L generated by the hash value list generation unit 14, and the message digest M generated by the message digest generation unit 15. Encryption is performed using the key 16A (see FIG. 2). The encrypted result is used as registration information R.

  The insertion unit 18 inserts the registration information R encrypted by the encryption unit 17 into the file trailer FT (see FIG. 3) of the digitized document file F.

  The decryption unit 19 reads the registration information R attached to the file trailer FT, decrypts the registration information R with the encryption key 16A, and generates a time certificate TP, a hash value list L, and a message digest M at the time of registration.

The falsification detection unit 20 detects whether or not the digitized document D has been falsified by processing to be described later.
<2. Operation of Electronic Document Management Server 10>
Next, the operation of the digitized document management server 10 according to the present embodiment will be described based on the flowcharts of FIGS. 5 and 6.

This process is divided into a time certificate registration method, a time certificate verification method, and a time certificate acquisition warning method.
<2-1. How to register time certificate>
First, registration of the digitized document file F will be described with reference to FIG.

  This process is started when an operator operates an operation unit (not shown) of the scanner 2. When a paper document is read by the scanner 2 and a new electronic document file F is formed, the control unit 11 forms the electronic document file F shown in FIG. Nothing is stored in the file header FH, file trailer FT, and document portion FM of the digitized document file F, and only the area is secured. At this time, the operator may be prompted to input the digitized document file version, document name, and creator information of the file header FH, or may be input automatically.

  The control unit 11 determines whether this digitized document file F is a fixed digitized document file F (step S1). In the case of a fixed (non-updatable) digitized document file F, since a fixed flag is set in the file header FH, the determination can be made by monitoring this fixed flag.

  If the immobilization flag is set in the determination process in step S1 (step S1; YES), the control unit 11 terminates this process as a storage prohibition (step S2).

  On the other hand, when the immobilization flag is not set in the determination process (step S1; NO), the control unit 11 stores the digitized document D in the digitized document file F (step S1). That is, the computerized document D is stored in the document part FM shown in FIG. 3 (step S3).

  If the fixed flag is not set, that is, in the non-fixed state, the electronic document D can be deleted from the electronic document file F. When the electronic document is deleted, the electronic document is deleted. The document area from the beginning of the storage area used by D may be justified (condensed), and the corresponding document name and hash value in the hash value list L may be deleted.

  Next, the control unit 11 transfers the stored data of the digitized document D to the hash value list generation unit 14, generates a hash value by the hash value list generation unit 14, and generates a document name and generation in the hash value list L0. The registered hash value is additionally registered and temporarily stored in the nonvolatile memory of the storage unit 12 (step S4).

  Then, the control unit 11 determines whether or not the digitized document D processed in step S4 is the final stored document (step S5), and steps S3 to S5 until the final digitized document D is stored. Repeat the process. The hash value list L0 is obtained by repeating the processes in steps S3 to S5.

  Note that in the determination process in step S5, if the number of digitized documents D stored in the digitized document file F is known in advance, information indicating that the final digitized document D is the final document is displayed. In addition, the determination process in step S5 may be performed based on this information. Alternatively, the operator may wait for an input (answer) as to whether or not the document is the final document.

  Further, the control unit 11 determines whether or not there is an instruction to acquire a time certificate (step S6). An instruction to acquire the time certificate is given by an operation unit (not shown). If there is no instruction to acquire the time certificate (step S6; NO), this process ends as a time certificate acquisition standby (step S10). When there is an instruction to acquire the time certificate (step S6; YES), the control unit 11 issues a time certificate request to the time certificate acquisition management unit 16, and the time certificate acquisition management unit 16 The time certificate TP is acquired from the issuing authority 5 (step S7). At this time, the identification number of the time certificate TP0 is also acquired.

  Note that if the instruction to automatically acquire the time certificate is given in advance from the operation unit, the process of step S6 described above is omitted.

  If the operator gives an instruction to acquire one time certificate for a plurality of electronic documents D, it is determined that the document is a final stored document (step S5; YES). A time certificate is obtained (step S7), and if there is no instruction from the operator to obtain one time certificate for a plurality of digitized documents D, the time certificate is obtained for each digitized document D. A document may be acquired (step S7).

  Further, the control unit 11 requests the message digest generation unit 15 to generate a message digest, and generates a message digest M0 based on the hash value list L0 temporarily stored in the nonvolatile memory (step S8). In this case, the hash values in the hash value list L0 are totaled, and a message digest M0 is generated by using a hash value function for the total value.

  The control unit 11 transmits an encryption command to the encryption unit 17, and the encryption unit 17 sends the time certificate TP0, the hash value list L0, and the message digest M0 to the PKI (Public Key Infrastructure; Encryption is performed using the encryption key 16A based on the signature.

  Then, the insertion unit 18 inserts the encrypted result as registration information R into the file trailer FT (see FIG. 3) of the digitized document file F (step S9).

Through the above processing, the electronic document file F shown in FIG. 3 is stored in the main storage device of the storage unit.
<2-2. Time certificate verification method>
Next, verification of the digitized document file F will be described with reference to FIG.

  When the time certification of the digitized document file F is necessary or when the falsification of the digitized document D is inspected, this process is performed to verify the time certification.

  At this time, the operator starts this processing by performing a predetermined operation on the operation unit (not shown) of the scanner 2 or the electronic document management server 10.

  The control unit 11 takes out the digitized document D from the document part FM of the digitized document file F, and temporarily stores it in the nonvolatile memory of the storage unit 12 (step S11).

  The control unit 11 transfers the data of the digitized document D to the hash value list generation unit 14, generates a hash value by the hash value list generation unit 14, and stores the document name and the generated hash value in the hash value list L. It is additionally registered and temporarily stored in the nonvolatile memory of the storage unit 12 (step S12). This process is repeated until the final stored document is processed, and a verification hash value list L1 is generated (steps S11 to S13).

  Further, the control unit 11 requests the message digest generation unit 15 to generate a message digest, and generates a verification message digest M1 based on the verification hash value list L1 temporarily stored in the nonvolatile memory (step S14).

  On the other hand, the control unit 11 reads the registration information inserted into the file trailer FT of the digitized document file F and transfers it to the decryption unit 19, which uses the time certificate TP 0, the hash value list L 0, and the message digest. M0 is restored (step S15).

The control unit 11 transfers the verification message digest M1 and the restored message digest M0 to the falsification detection unit 20, and the falsification detection unit 20 collates the digests M0 and M1 to determine whether or not they are the same ( Step S16)
If there is no match in this determination processing (step S16; NO), the falsification detection unit 20 collates the hash value for each document in the verification hash value list L1 and the restored hash value list L0, and the mismatched document And the changed / updated electronic document D is specified (step S17). As a result, it is possible to specify that the digitized document file F has been falsified and that the digitized document D has been changed / updated. This result is reported on a display unit or the like (not shown).

  On the other hand, when the digests M0 and M1 are the same in the determination process of step S16 (step S16; YES), the control unit 11 inquires of the time certificate issuing authority 5 about the validity of the time certificate TP0. (Step S18). At this time, the identification number when the time certificate is acquired is transmitted. Thereby, the time certificate issuing authority 5 determines whether or not the time certificate TP0 is valid (step S19). That is, it is determined whether or not the time certificate TP0 is within the certification period and is a regular certificate. The process of step S19 is a process performed by the time certificate issuing authority 5.

  If the time certificate TP0 is valid as a result of this determination processing (step S19; YES), “no problem with tampering / certificate” is notified to the display unit or the like (step S20), and this processing ends. To do.

On the other hand, if it is determined that the time certificate TP0 is not valid as a result of the determination process in step S19 (step S19; NO), “time certificate TP0 is invalid” is notified to the display unit or the like (step S21). This process ends.
<2-3. Warning method for time certificate acquisition>
Next, a time certificate acquisition warning will be described with reference to FIG.

The operation unit 11 determines whether or not a predetermined period has elapsed since the electronic documentization time of the electronic document D stored in the file header FH (step S21). If the predetermined period has not elapsed (step S21; NO), it is determined whether or not the document is the last registered document (step S24). If the predetermined period has elapsed (step S21; YES), it is determined whether or not the registration information R is inserted in the file trailer FT (step S22). When the registration information R is not inserted in the file trailer FT (step S22; NO), a warning is given to the operator or a person registered in advance (step S23). The warning is performed by sending an e-mail to the operator or displaying it on a display unit (not shown). When the registration information R is inserted in the file trailer FT (step S22; YES), it is determined whether or not the digitized document D is the last stored document (step S24). If it is not the final stored document (step S24; NO), the processes from step S21 to step S24 are repeated until the final stored document. If it is the last stored document (step S24; YES), the process ends.
<3. Effects of this embodiment>
As described above, in the time certification system 1, the time certificate TP is not assigned to each digitized document D, but the digitized document file F in which a plurality of digitized documents D are stored. Since the number of time certificates TP issued from the time certificate issuing authority 5 can be greatly reduced as compared with the case where each electronic document D is assigned, the cost can be greatly reduced. it can.

In addition, by providing a fixed flag in the file header FH of the digitized document file F, the change / update / addition of the digitized document D in the digitized document file F can be prohibited. It is possible to protect the computerized document D inside.
<4. Modification>
As mentioned above, although embodiment of this invention was described, this invention is not limited to embodiment mentioned above, A various aspect is possible.
(1) Application as a file system The present invention is also applicable to a hierarchical file system.

  FIG. 8 shows the structure of a file system that supports a hierarchical directory structure. In this modification, the digitized document file is a node, and the information in the frame indicates information written in the head or trailer of the digitized document file.

  In this file system, in general, to realize hierarchical management, each node (digitized document file) has a node type (folder, general file, etc.), creation, creation date, update date, access right, right under the node Node attribute information indicating a link to the node to be operated is provided. In addition to this, a hash value is obtained for the contents of the node itself by using a hash value function, a hash value storage area for storing the hash value is provided, and a time certificate for storing a time certificate in a node located upstream A storage area is provided.

  If the node having the hash value storage area and the time certificate storage area is set as the top node in this way, when a node such as a file other than a folder is newly added in the lower layer, the node creation date / time, update date / time, A hash value calculated from the access right and node content is obtained, encrypted, and inserted into the top node. When the contents of the node are updated, the hash value is recalculated and updated to the top node to always maintain consistency between the node contents and the hash value.

  When a folder is newly created, a hash value is calculated using items other than node contents, and the hash value is stored. Even when a node is additionally registered in the folder, the hash value of the contents of the node is calculated and stored in the node, and the hash value of the folder is recalculated using the contents of the node.

  In the above system, when it is desired to fix (baseline) a hierarchy lower than a certain node, a time certificate is obtained from the time certificate issuing authority, and this is encrypted and set in the top node to be archived. Then, the access right to the subordinate node is changed to reference only.

  In this way, a base line that can detect tampering can be created.

  On the other hand, when tampering is checked, a hash value can be calculated for each node below the check target node, and the presence or absence of tampering can be detected by comparing with hash value information held by each node. When the node type is a folder, a hash value of a node below the corresponding node is calculated, and compared with the hash value held by each folder node, whether or not there is a difference is verified.

In this way, by applying the technique of the present invention, it is possible to easily implement a falsification preventing file system by adding the node's own hash value storage area and time certificate storage area to the node attribute.
(2) Configuration of the time certification system 1 In the time certification system 1 of the above embodiment, the digitized document file F is created by the digitized document management server 10 and the time certification is managed. Not limited to this, each scanner 2 may manage the digitized document file F to which the time certificate TP is assigned.

  The computerized document management server 10 is not limited to a case where it is connected to a LAN (Local Area Network), but can also be applied to a range of use outside the company. The electronic document management server 10 may be managed by a business operator connected to the management server 10.

  Further, in the structure of the digitized document file F shown in FIG. 3, the file header FH, the document part FM, and the file trailer FT are configured. However, either the file header FH or the file trailer FT is formed, In this area, the electronic document time for each electronic document D, the version of the electronic document file, the creator information, the immobilization flag, the trailer offset, the document offset table, and the registration information R may be stored. .

  Furthermore, in the embodiment, the document specifying information constituting the hash value list L is the document name. However, the present invention is not limited to this, and any unique information such as an identification code may be used.

1 is a diagram illustrating a time certification system according to an embodiment of the present invention. It is a figure which shows the outline | summary by embodiment. It is a figure which shows the structure of the digitized document file by embodiment. It is a block diagram which shows the structure of the digitized document management server by embodiment. It is a flowchart which shows the registration process of the digitized document file by embodiment. It is a flowchart which shows the verification process of the digitized document file by embodiment. It is a flowchart which shows the time acquisition certification | authentication acquisition warning process of the digitized document file by embodiment. It is a figure which shows the file system by a modification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Time certification system 2, 2A, 2B, 2N ... Scanner, 3 ... LAN, 4 ... Internet, 5 ... Time certificate issuing authority, 10 ... Electronic document management server, 11 ... Control part, 12 ... Memory | storage part, DESCRIPTION OF SYMBOLS 13 ... Transmission / reception part, 14 ... Hash value list generation part, 15 ... Message digest generation part, 16 ... Time certificate acquisition part, 17 ... Encryption part, 18 ... Insertion part, 19 ... Decryption part, 20 ... Tampering detection part, F ... digitized document file, FH ... file header, FM ... document part, FT ... file trailer, D ... digitized document, L ... hash value list, M ... message digest, TP ... time certificate.

Claims (12)

An electronic document generating means for reading an original and generating an electronic document;
Electronic time storage means for storing the electronic time at which the electronic document was generated by the electronic document generation means;
Time certificate acquisition means for acquiring a time certificate to be given to the electronic document;
A warning unit that issues a warning prompting the time certificate acquisition unit to acquire the time certificate when a predetermined period has elapsed from the electronic time without the time certificate being provided;
A time certificate acquisition system characterized by having An electronic document generating means for reading a plurality of originals and generating an electronic document;
Electronic time storage means for storing the electronic time at which the electronic document was generated by the electronic document generation means;
Time certificate acquisition means for acquiring one time certificate to be given to an electronic document file comprising a plurality of electronic documents;
A warning unit that issues a warning prompting the time certificate acquisition unit to acquire the time certificate when a predetermined period has elapsed from the electronic time without the time certificate being provided;
A time certificate acquisition system characterized by having An electronic document generating means for reading an original and generating an electronic document;
Electronic time storage means for storing the electronic time at which the electronic document was generated by the electronic document generation means;
Time certificate acquisition means for acquiring a time certificate to be given to the electronic document;
Time when the time certificate is acquired by the time certificate acquisition means and the time certificate is given to the digitized document when a predetermined period has elapsed from the digitization time without being given the time certificate A certificate granting means;
A time certificate acquisition system characterized by having   The time certificate acquisition system according to claim 1 or 2, wherein the time certificate acquisition unit does not acquire a time certificate until an instruction to acquire the time certificate is given. An electronic document generating means for reading an original and generating an electronic document;
Electronic time storage means for storing the electronic time at which the electronic document was generated by the electronic document generation means;
Time certificate acquisition means for acquiring a time certificate to be given to the electronic document;
A warning unit that issues a warning prompting the time certificate acquisition unit to acquire the time certificate when a predetermined period has elapsed from the electronic time without the time certificate being provided;
A time certificate acquisition apparatus characterized by comprising: An electronic document generating means for reading a plurality of originals and generating an electronic document;
Electronic time storage means for storing the electronic time at which the electronic document was generated by the electronic document generation means;
Time certificate acquisition means for acquiring one time certificate to be given to an electronic document file comprising a plurality of electronic documents;
A warning unit that issues a warning prompting the time certificate acquisition unit to acquire the time certificate when a predetermined period has elapsed from the electronic time without the time certificate being provided;
A time certificate acquisition apparatus characterized by comprising: An electronic document generating means for reading an original and generating an electronic document;
Electronic time storage means for storing the electronic time at which the electronic document was generated by the electronic document generation means;
Time certificate acquisition means for acquiring a time certificate to be given to the electronic document;
Time when the time certificate is acquired by the time certificate acquisition means and the time certificate is given to the digitized document when a predetermined period has elapsed from the digitization time without being given the time certificate A certificate granting means;
A time certificate acquisition apparatus characterized by comprising:   The time certificate acquisition apparatus according to claim 5 or 6, wherein the time certificate acquisition unit does not acquire a time certificate until an instruction to acquire the time certificate is received. On the computer,
An electronic document generation step of generating an electronic document reading et allowed to reading means a document,
And electronic time storage step of causing the storage in the memory means electronic time the electronic document is generated by the electronic document generation step,
A time certificate acquisition step of acquiring a time certificate to be given to the electronic document;
A warning step of issuing a warning for prompting the acquisition of the time certificate when a predetermined period has elapsed from the electronic time without being given the time certificate;
Time proof acquisition program to execute . On the computer,
An electronic document generation step of generating an electronic document reading et allowed the reading means a plurality of originals,
And electronic time storage step of causing the storage in the memory means electronic time the electronic document is generated by the electronic document generation step,
A time certificate acquisition step of acquiring one time certificate to be given to an electronic document file comprising a plurality of the electronic documents;
A warning step of giving a warning prompting the acquisition of the time certificate when a predetermined period has elapsed from the electronic time without being given the time certificate;
Time proof acquisition program to execute . On the computer,
An electronic document generation step of generating an electronic document reading et allowed to reading means a document,
And electronic time storage step of causing the storage in the memory means electronic time the electronic document is generated by the electronic document generation step,
Time certificate grant that acquires the time certificate and grants the time certificate to the digitized document when a predetermined period has elapsed from the digitization time without being given a time certificate to the digitized document Steps,
Time proof acquisition program to execute . The time certificate acquisition program according to claim 9 or 10, wherein the time certificate acquisition step does not acquire the time certificate until an instruction to acquire the time certificate is received.

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