JP2008140218A - Program and device for generating electronic document, program and device for verifying electronic document, and electronic document signing system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate the verification of change in an electronic document having a complicated structure. <P>SOLUTION: An electronic document generating device includes: an electronic document body 50 including reference information for referring to the other electronic documents 56, 68; and related data 52 including the duplicates 64, 76 of electronic signatures 62, 74 in the reference destination electronic documents 56, 68. The generating device generates the electronic document 48 where the duplicates 64, 76 of the electronic signatures are respectively associated with external reference corresponding to the reference destination electronic documents 56, 68. An electronic document verifying device verifies the presence/absence of change in the reference destination electronic document 56 through the use of the reference destination electronic document 56, and the electronic signature 64 associated with the external reference corresponding to the reference destination electronic document 56 in the related data 52. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to verification of whether or not an electronic document has been changed, and more particularly to an electronic document creation program, an electronic document verification program, an electronic document signature system, an electronic document creation device, and an electronic document verification device.

  Electronic signature information to verify the creator of an electronic document and to ensure that the electronic document has not been tampered with, just like a paper document is stamped or signed (Hereinafter referred to as “electronic signature”) is generally performed. For example, in a public key cryptosystem generally used as an electronic signature technique, a digest is generated from an electronic document using a hash function, and data obtained by encrypting the generated digest with a signer's private key is converted into electronic data for the electronic document. The signature. A person who has received an electronic document with an electronic signature using public key cryptography compares the digest obtained by decrypting the electronic signature with the signer's public key and the digest generated from the received electronic document. By doing so, it is possible to verify whether or not the received electronic document has been altered.

  Usually, the electronic signature is generated from the entire data of the electronic document. Therefore, when only a part of the electronic document is modified, the fact that the electronic document has been modified can be detected using the electronic signature, but it is not possible to specify which part has been modified. As a technique for verifying modification of a specific part of an electronic document, Patent Document 1 discloses a technique for generating an electronic signature for an element designated by a user among a plurality of elements included in an electronic document. . Patent Document 2 discloses a technique for generating an electronic signature for a specified area of an electronic document.

  By the way, recently, an electronic document having a complicated structure that refers to another electronic document from one electronic document, such as an XML (Extensible Markup Language) format document, is often used.

  FIG. 7 shows an example of an electronic document that refers to another electronic document. The electronic document 10 “sales report” refers to the electronic document 12 “2004 sales” and the electronic document 14 “2005 sales”. The electronic document 10 has an external reference that is reference information to the electronic documents 12 and 14. The external reference includes, for example, URL (Uniform Resource Locator) indicating the location of the reference destination document on the Internet, and the entity data of the reference destination document including the path indicating the location of the reference destination document on the computer storage device. It is information necessary to obtain The actual data of “2004 sales” and “2005 sales” are included in the electronic documents 12 and 14, respectively, and are not included in the electronic document 10. The electronic document 10 in FIG. 7 shows a state in which entity data of “2004 sales” and “2005 sales” included in the electronic documents 12 and 14 are incorporated.

  As an electronic signature technique for an electronic document that refers to another electronic document, a technique for generating an electronic signature from data obtained by combining a reference source electronic document and a reference destination electronic document has been recently developed. For example, in the Simple Object Access Protocol (SOAP), which is one of the protocols for calling data and software functions of different computers, data transmission technology MTOM (Message Transmission Optimization Mechanism) / XOP (XML-binary Optimized Packaging) An electronic signature is generated from data including data and external data referred to by the transmission data.

Japanese Patent Laid-Open No. 7-182431 JP 2005-309973 A

  Even when the techniques described in Patent Documents 1 and 2 are applied to verify the modification of an electronic document having a complicated structure that refers to another electronic document, a part of the reference electronic document However, it is not possible to detect a modification of a reference electronic document.

  In addition, even when an electronic signature is generated from data incorporating a reference source and a reference destination electronic document, it is possible to detect alterations in the entire reference source and reference destination electronic documents, but which electronic documents are modified. It is not possible to specify. That is, it cannot be specified which electronic document of the reference source or the reference destination has been modified, or which reference destination electronic document has been modified when there are a plurality of reference destination electronic documents.

  An object of the present invention is to provide an electronic document creation program, an electronic document verification program, an electronic signature system, an electronic document creation device, and an electronic document verification device that facilitate verification of modification of an electronic document having a complicated structure. It is.

  An electronic document creation program according to the present invention is an electronic document with reference information including reference information for referring to another electronic document stored in a storage unit, and the reference destination electronic indicated by the reference information Electronic document creation means for creating an electronic document with reference information including information associating an electronic signature generated based on a document and the reference information corresponding to the reference destination electronic document that is the generation source of the electronic signature It is characterized by functioning as.

  In the electronic document creation program according to the present invention, the reference information is further based on the electronic document with reference information and related data including an electronic signature generated based on a reference destination electronic document indicated by the reference information. It is desirable to cause the computer to function as electronic signature generation means for generating an electronic signature for the attached electronic document. In one aspect of the electronic document creation program of the present invention, the related data is included in the electronic document with reference information.

  An electronic document verification program according to the present invention is an electronic document with reference information including reference information for referring to another electronic document stored in a storage unit, and a reference destination electronic indicated by the reference information For an electronic document with reference information that includes information associating an electronic signature generated based on the document and the reference information corresponding to the reference electronic document that is the generation source of the electronic signature, A reference electronic document indicated by the reference information included in the document, and an electronic signature associated with the reference information in the related data including the electronic signature generated based on the reference electronic document indicated by the reference information. Based on this, it is made to function as a reference destination document change determination means for determining whether or not the reference destination electronic document indicated by the reference information has been changed.

  In the electronic document verification program according to the present invention, an electronic document change for determining whether or not the electronic document with reference information and the related data are changed based on an electronic signature generated for the electronic document with reference information It is preferable to make a computer function as the determination means. In one aspect of the electronic document verification program according to the present invention, the related data is included in the electronic document with reference information.

  In the electronic document verification program according to the present invention, the reference-destination document change determination unit and the electronic It is desirable to cause the computer to function as a recursion unit that performs at least one of the determinations in the document change determination unit.

  An electronic document signature system according to the present invention includes an electronic document including reference information for referring to another electronic document, related data including an electronic signature generated based on a reference destination electronic document indicated by the reference information, Creating an electronic document with reference information including information that associates the storage unit storing the electronic signature with the reference information corresponding to the reference electronic document that is the generation source of the electronic signature Based on an electronic document creation apparatus having means, a reference electronic document indicated by the reference information included in the electronic document with reference information, and an electronic signature associated with the reference information in the related data. An electronic document verification device having a reference destination document change determination unit that determines whether or not the reference destination electronic document indicated by the reference information has been changed.

  An electronic document creation apparatus according to the present invention includes an electronic document including reference information for referring to another electronic document, and related data including an electronic signature generated based on a reference destination electronic document indicated by the reference information, Creating an electronic document with reference information including information that associates the storage unit storing the electronic signature with the reference information corresponding to the reference electronic document that is the generation source of the electronic signature And means.

  An electronic document verification apparatus according to the present invention includes an electronic document including at least one reference information for referring to another electronic document, and an electronic signature generated based on a reference destination electronic document indicated by the reference information A storage unit storing data, the electronic signature, and an electronic document with reference information including information associating the reference information corresponding to the reference electronic document that is the generation source of the electronic signature, Based on the reference electronic document indicated by the reference information included in the electronic document with reference information and the electronic signature associated with the reference information in the related data, the reference electronic document indicated by the reference information is changed. Reference destination document change determination means for determining the presence or absence of the reference destination document.

  According to the first aspect of the present invention, it is possible to easily verify modification of an electronic document with reference information that refers to another electronic document.

  According to the invention which concerns on Claim 2 and 3, the modification with respect to both the electronic document with a reference information and related data can be verified.

  According to the invention of claim 4, the reference electronic document is generated between the time when the electronic signature generated based on the reference electronic document is held in the related data and the time when the reference electronic document is verified. It is possible to verify whether there has been any modification.

  According to the invention which concerns on Claim 5 and 6, the modification with respect to both the electronic document with a reference information and related data can be verified.

  According to the invention of claim 7, whether or not the reference destination electronic document of the electronic document with reference information and the related data have been altered is verified, and the electronic document further referred to by the reference destination electronic document of the electronic document with reference information The electronic signature generated from the electronic document is verified as to whether or not the electronic document has been modified between the time when the electronic signature is stored in the related data and the time when the electronic document is verified. be able to.

  According to the inventions according to claims 8, 9 and 10, it is possible to facilitate verification of alteration of an electronic document having a complicated structure.

  Embodiments of the present invention will be described below in detail with reference to the drawings.

  FIG. 1 is a diagram showing an example of an electronic signature system according to an embodiment of the present invention. The electronic signature system 20 includes an electronic document creation device 22, an electronic document verification device 24, and an electronic document database 26. The electronic document creation device 22 and the electronic document verification device 24 are connected to the electronic document database 26 via the communication means 28. The communication means 28 may be a network such as the Internet or a LAN (Local Area Network).

  The electronic document creation apparatus 22 is an apparatus that creates an electronic document including reference information that refers to another electronic document, and includes a reference processing unit 30 that performs processing related to reference information included in the electronic document, and an electronic signature for the electronic document. And a signature generation unit 32. The electronic document verification device 24 is a device that verifies alteration of an electronic document. Details of processing performed by the electronic document creation device 22 and the electronic document verification device 24 will be described later.

  The electronic document database 26 is a database that stores electronic documents. The electronic document database 26 stores the electronic document created by the electronic document creation device 22 and provides the electronic document verification device 24 with an electronic document to be verified by the electronic document verification device 24. The electronic document database 26 can be realized using a storage device such as a server or a computer, and may be realized on a mobile storage medium such as a CD. The electronic document database 26 can be realized using a plurality of storage devices instead of a single storage device.

  FIG. 2 is a diagram illustrating an example of a configuration of a computer that can function as an electronic document creation apparatus or an electronic document verification apparatus according to an embodiment of the present invention. The computer 34 has a configuration in which a control unit 36, an input device 38, an output device 40, a storage device 42, and a communication unit 44 are connected by a bus 46. The control unit 36 is an arithmetic device such as a CPU (Central Processing Unit). The input device 38 is a device such as a keyboard and a mouse, and receives input from the user such as instructions necessary for processing performed by the control unit 36. The output device 40 is a display device such as a CRT (Cathode Ray Tube) display or a liquid crystal display, for example, and displays the contents of the electronic document, the processing results in the control unit 36, and the like. The storage device 42 is a storage medium such as a hard disk, CD, or DVD, and can store a created electronic document, a program that describes processing to be performed by the computer 34, and the like. The communication unit 44 communicates with a server, other computers, and other devices connected to the computer 34. An electronic document creation program or an electronic document verification program that describes processing to be described later performed by the electronic document creation device 22 or the electronic document verification device 24 is stored in the storage device 42, and the control unit 36 calls and executes the program. Thus, the computer 34 can function as the electronic document creation device 22 or the electronic document verification device 24. Both the electronic document creation program and the electronic document verification program may be stored in the storage device 42, and one computer 34 may function as the electronic document creation device 22 and the electronic document verification device 24.

  An example of an electronic document creation process performed by the reference processing unit 30 and the signature generation unit 32 of the electronic document creation apparatus 22 will be described with reference to FIGS.

  FIG. 3 is a diagram illustrating an example of an electronic document created by the electronic document creation device 22. The electronic document 48 in FIG. 3 refers to the electronic documents 56 and 68. The electronic document 48 includes an electronic document main body 50 including document data and related data 52 including information related to the reference electronic document. The electronic document body 50 includes external references that are reference information to the electronic documents 56 and 68. The related data 52 includes copies 64 and 76 of the electronic signatures 62 and 74 of the referenced electronic documents 56 and 68, respectively. The related data 52 may exist separately from the electronic document main body 50 or may be included in the electronic document main body 50. The copies 64 and 76 of the electronic signatures 62 and 74 are respectively copied when the external reference to the reference electronic documents 56 and 68 is first inserted into the electronic document body 50 or the reference electronic documents 56 and 56 in the electronic document body 50. The electronic signatures 62 and 74 attached to the reference electronic documents 56 and 68 when the external reference to 68 is updated are copied. Replicas 64 and 76 of electronic signatures 62 and 74 in associated data 52 are associated with external references to electronic documents 56 and 68 in electronic document body 50, respectively.

  FIG. 4 shows an electronic document 56 to which the electronic document 48 refers. The electronic document 56 is another example of an electronic document created by the electronic document creation device 22. Since the electronic document 56 does not refer to other electronic documents, the electronic document main body 58 does not include an external reference. Therefore, the related data 60 that is a part that holds a copy of the signature of the reference destination electronic document does not include the electronic signature. As described above, related data included in an electronic document that does not refer to another electronic document does not include substantial information.

  Returning to FIG. 3 again, the reference electronic document 68 of the electronic document 48 further refers to the electronic document 80. The related data 72 of the electronic document 68 includes a copy 84 of the electronic signature 82 of the electronic document 80. The copy 84 of the electronic signature 82 is when the external reference to the electronic document 80 is first inserted into the electronic document body 70 of the electronic document 68 or when the external reference to the electronic document 80 in the electronic document body 70 is updated. Thus, the electronic signature 82 attached to the electronic document 80 is copied.

  As shown in FIG. 3, the electronic document created by the electronic document creation device 22 may be one in which the reference destination electronic document of the electronic document does not refer to another electronic document, or the reference destination electronic document further includes It may refer to another electronic document. Although not shown in FIG. 3, the electronic document referred to by the reference electronic document may refer to another electronic document.

  FIG. 5 is a flowchart illustrating an example of an electronic document creation process performed by the electronic document creation apparatus 22. Steps S <b> 1 to S <b> 5 are processes related to referencing an electronic document and correspond to the processes performed by the reference processing unit 30. Step S6 is processing for generating a signature for the electronic document, and corresponds to processing performed by the signature generation unit 32.

  The processing performed by the reference processing unit 30 from step S1 to step S5 will be described by taking as an example processing for inserting an external reference to the electronic document 56 into the electronic document 48 of FIG. First, in step S 1, the reference electronic document 56 is acquired from the electronic document database 26. Next, in step S <b> 2, an external reference that is reference information to the reference destination electronic document 56 is generated. Next, an external reference to the reference destination electronic document 56 is inserted into the electronic document main body 50 in step S3. For example, by holding an external reference in the electronic document main body 50, the contents of the reference electronic document 56 are displayed on the external reference unit 54 in the electronic document main body 50. Next, in step S4, the electronic signature 62 attached to the reference electronic document 56 is acquired. In step S <b> 5, an electronic signature 64 obtained by copying the electronic signature 62 of the acquired reference destination electronic document 56 is added to the related data 52 in association with the external reference of the reference destination electronic document 56. When there is another electronic document to be referred to, the processing from step S1 to step S5 is performed for each reference electronic document. In the example of FIG. 3, the electronic document 68 is also processed in steps S <b> 1 to S <b> 5 similarly to the electronic document 56.

  The processing from step S1 to step S5 can be performed when an external reference to the reference electronic document is inserted into the electronic document for the first time. Further, with respect to the external reference already included in the electronic document, the processing from step S1 to step S5 or the processing of step S4 and step S5 is periodically performed, and the electronic signature associated with the external reference in the related data is obtained. It may be updated. The update of the electronic signature associated with the external reference already included in the electronic document may be performed as necessary, for example, when there is an instruction from the user.

  In step S6, the signature generation unit 32 generates an electronic signature for the electronic document using the electronic document main body and the related data. For example, in the case of an electronic signature using a public key cryptosystem, a digest is generated from data that combines the electronic document body and related data using a hash function, and the generated digest is encrypted using the signer's private key. Then, an electronic signature is generated. In the example of FIG. 3, the electronic signature 78 of the electronic document 48 is generated from the electronic document main body 50 and the related data 52. As in the example of FIG. 4, the electronic signature 62 can be generated from the electronic document main body 58 and the related data 60 even when the related data 60 does not include particularly substantial information. The electronic signature generation process in step S6 is executed as necessary.

  The electronic document creation process in the electronic document creation apparatus 22 has been described above with reference to FIGS. Hereinafter, an electronic document verification process performed by the electronic document verification apparatus 24 for verifying whether or not an electronic document has been modified will be described. The electronic document verification device 24 verifies the presence / absence of alteration of an electronic document including reference information to another electronic document. For example, an electronic document such as an electronic document 48 (see FIG. 3) created by the electronic document creation device 22 is a verification target of the electronic document verification device 24.

  FIG. 6 is a flowchart illustrating an example of an electronic document verification process performed by the electronic document verification apparatus 24. In step S10, the entire electronic document to be verified is verified. In the verification process in step S10, an electronic signature attached to the electronic document to be verified is used. For example, when the electronic document 48 of FIG. 3 is a verification target, the electronic signature 48 attached to the electronic document 48 is used to verify whether the entire electronic document 48 has been altered.

  Next, in step S11, the result of the verification in step S10 is received, and it is determined whether or not the entire electronic document has been altered. If it is determined that there is a modification, the process proceeds to step S17, and a preset electronic document modification detection process is performed. In the electronic document alteration detection process in step S17, for example, the detection of the electronic document alteration is recorded in a file prepared for recording the processing result, or a message notifying that the alteration of the electronic document has been detected is output to the output device. It is a process to output. In step S17, both recording of electronic document alteration detection and message output may be performed.

  If it is determined in step S11 that the entire electronic document has not been altered, the process proceeds to step S12. In step S12, it is determined whether or not an unverified external reference exists in the electronic document body. If there is an unverified external reference, one unverified external reference is selected and the process proceeds to step S13. If there is no unverified external reference, the process ends.

  In step S13, an electronic document referred to by the selected unverified external reference is acquired from the electronic document database 26, and this flowchart is recursively called and executed with the referenced electronic document as a verification target. That is, the processing in step S10 and subsequent steps is performed on the reference electronic document referred to by the selected unverified external reference.

  Next, in step S14, the electronic document referenced by the external reference is verified using the electronic signature associated with the unverified external reference selected in step S12 in the related data of the electronic document to be verified. Do. In step S14, for example, when an external reference to the reference electronic document is inserted into the verification target electronic document by comparing the electronic signature in the related data with the signature attached to the reference electronic document. Verify whether there is any modification of the reference electronic document from Alternatively, by comparing the digest obtained by decrypting the electronic signature in the related data with the digest generated from the acquired reference electronic document, it is possible to verify whether the reference electronic document has been altered or not. .

  Next, in step S15, the result of the verification in step S14 is received, and it is determined whether or not the reference electronic document is altered. If it is determined that there is no alteration, the process returns to step S12, and the processes after step S12 are executed. If it is determined that there is a modification, the process proceeds to step S16.

  In step S16, a preset reference destination electronic document alteration detection process is performed. In step S16, for example, the fact that the alteration of the reference destination electronic document has been detected, the file name of the reference destination electronic document, and other necessary information are recorded in a file prepared for recording the processing result. A message notifying the detection of the alteration of the reference electronic document can be output to the output device together with the alteration detection record or instead of the alteration detection record. After the process of step S16, the processes after step S12 are repeated.

  When the execution of the electronic document verification process shown in FIG. 6 is completed, verification of the electronic document to be verified and all electronic documents that the electronic document refers directly or indirectly through the reference electronic document is performed. Will be executed. If the identification information indicating the electronic document to be processed is recorded in step S13 for performing the recursive call, it is directly referred to from the verification-target electronic document and the verification-target electronic document after completion of the electronic document verification processing. It is also possible to obtain information indicating the state of the reference electronic document and the state of the document structure of the electronic document further referenced from the reference destination.

  After completion of the electronic document verification process shown in FIG. 6, the processing result can be output to the output device. A file in which the processing result is recorded may be generated. For example, when the file name of the electronic document in which the modification is detected in the reference-target electronic document modification detection process in step S16 and the electronic document modification detection process in step S17 is recorded, the file name of the modified electronic document And a reference relationship between the electronic document and the electronic document to be verified can be output as a table or list to an output device, or a file in which such a table or list is recorded can be generated. Here, the reference relationship is information representing the document structure of the electronic document, for example, information indicating how many reference destination electronic documents are traced from the electronic document to be verified to obtain the modified electronic document. It is. Further, the electronic document to be verified may be displayed with emphasis on the external reference portion corresponding to the modified reference document in the electronic document to be verified. For example, as a result of performing the electronic document verification processing of FIG. 6 on the electronic document 48 of FIG. 3, if alteration of the reference destination electronic document 68 is detected, the electronic document main body 50 corresponds to the reference destination electronic document 68. The external reference section 66 to be displayed can be displayed in a color different from the original color, surrounded by a frame, or otherwise highlighted.

  Note that the flowchart shown in FIG. 6 is an example of the procedure of the electronic document verification process, and the electronic document to be verified and all the electronic documents that the electronic document refers to directly or indirectly through the reference electronic document. The electronic document verification process may be performed according to a procedure different from the procedure shown in FIG. 6 as long as the verification with the document is executed.

It is a figure which shows an example of the electronic signature system of one embodiment of this invention. It is a figure which shows an example of a structure of the computer which can be functioned as the electronic document production apparatus or electronic document verification apparatus of one Embodiment of this invention. It is a figure which shows an example of the electronic document which the electronic document production apparatus of one Embodiment of this invention produces. It is a figure which shows another example of the electronic document which the electronic document preparation apparatus of one Embodiment of this invention produces. It is a flowchart which shows an example of the process which the electronic document creation apparatus of one embodiment of this invention performs. It is a flowchart which shows an example of the process which the electronic document verification apparatus of one Embodiment of this invention performs. It is a figure which shows an example of the electronic document which refers to another electronic document.

Explanation of symbols

  20 electronic signature system, 22 electronic document creation device, 24 electronic document verification device, 26 electronic document database, 28 communication means, 30 reference processing unit, 32 signature generation unit, 34 computer, 36 control unit, 38 input device, 40 output device , 42 Storage device, 44 Communication unit, 46 Bus, 48, 80 Electronic document, 50, 58, 70 Electronic document body, 52, 60, 72 Related data, 54, 60 External reference unit, 56, 68 Referenced electronic document, 62, 74, 78, 82 Electronic signature, 64, 76, 84 Copy of electronic signature.

Claims (10)

Computer
An electronic document with reference information including reference information for referring to another electronic document stored in the storage unit, the electronic signature generated based on the reference electronic document indicated by the reference information, and the electronic signature Electronic document creation means for creating an electronic document with reference information including information for associating the reference information corresponding to the reference electronic document that is a signature generation source;
An electronic document creation program characterized by functioning as The electronic document creation program according to claim 1, further comprising:
Electronic signature generation for generating an electronic signature for the electronic document with reference information based on the electronic document with reference information and related data including an electronic signature generated based on the reference electronic document indicated by the reference information means,
An electronic document creation program characterized by causing a computer to function as The electronic document creation program according to claim 2,
The electronic document creation program, wherein the related data is included in the electronic document with reference information. Computer
An electronic document with reference information including reference information for referring to another electronic document stored in the storage unit, the electronic signature generated based on the reference electronic document indicated by the reference information, and the electronic signature For an electronic document with reference information including information for associating the reference information corresponding to the reference electronic document that is a signature generation source,
A reference destination electronic document indicated by the reference information included in the electronic document with reference information, and an association with the reference information in the related data including an electronic signature generated based on the reference destination electronic document indicated by the reference information A reference-destination document change determination unit that determines whether there is a change in the reference-destination electronic document indicated by the reference information based on the electronic signature;
An electronic document verification program characterized by functioning as The electronic document verification program according to claim 4, further comprising:
An electronic document change determination means for determining whether or not the electronic document with reference information and the related data are changed based on an electronic signature generated for the electronic document with reference information;
An electronic document verification program characterized by causing a computer to function as The electronic document verification program according to claim 5,
An electronic document verification program, wherein the related data is included in the electronic document with reference information. The electronic document verification program according to claim 5, further comprising:
Recursion that performs at least one of the determinations in the reference destination document change determination unit and the electronic document change determination unit with the reference destination electronic document indicated by the reference information included in the electronic document currently being processed as a new processing target means,
An electronic document verification program characterized by causing a computer to function as A storage unit that stores an electronic document including reference information for referring to another electronic document, and related data including an electronic signature generated based on a reference electronic document indicated by the reference information;
An electronic document creation device having electronic document creation means for creating an electronic document with reference information including information associating the electronic signature with the reference information corresponding to the reference destination electronic document from which the electronic signature is generated When,
Based on the reference destination electronic document indicated by the reference information included in the electronic document with reference information and the electronic signature associated with the reference information in the related data, the reference destination electronic document indicated by the reference information An electronic document verification apparatus having a reference document change determination means for determining whether there is a change;
An electronic document signature system comprising: A storage unit that stores an electronic document including reference information for referring to another electronic document, and related data including an electronic signature generated based on a reference electronic document indicated by the reference information;
An electronic document creating means for creating an electronic document with reference information including information associating the electronic signature with the reference information corresponding to the reference electronic document that is the generation source of the electronic signature;
An electronic document creation device comprising: A storage unit that stores an electronic document including reference information for referring to another electronic document, and related data including an electronic signature generated based on a reference electronic document indicated by the reference information;
For the electronic document with reference information including the information that associates the electronic signature with the reference information corresponding to the reference electronic document that is the generation source of the electronic signature, the reference included in the electronic document with reference information Reference destination document change determination for determining whether or not the reference destination electronic document indicated by the reference information is changed based on the reference destination electronic document indicated by the information and the electronic signature associated with the reference information in the related data Means,
An electronic document verification apparatus comprising:

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