JP4683534B2 - Electronic document management system and method and program - Google Patents

Description

  The present invention relates to a technique for managing an electronic document created by a personal computer or the like using a hash value, and in particular, a delivery confirmation and an acceptance order and a document at a delivery destination which are required when the electronic document is exchanged through a network or the like. The present invention relates to a technique suitable for guaranteeing the originality of the image.

  In general electronic document exchange (electronic document exchange), when a document is sent from an issuer (transmission source) to a reception source (transmission destination), data indicating that the reception source has received the document from the issuer (for example, Confirm delivery by returning a receipt. In this case, it is unclear whether the received data is really not falsified. Also, since the received data is returned every time the document is exchanged, the data occupancy rate on the line is increased, leading to a deterioration in response.

  For example, Patent Document 1 discloses a conventional technique for managing electronic documents in response to such a problem. This technique is intended to reliably identify all the original text and the changed document, part of the document creator, and the approver. Specifically, in the terminal (computer) operated by the original creator, a hash value is generated from the newly created original and transmitted to the approver terminal together with the original. In the approver terminal, the original and the hash value are In this technique, new hash values are generated from the document, and these hash values are stored and managed by the document management server. However, this technique relates to so-called electronic payment of documents, and does not guarantee the order and originality of general distribution of electronic documents.

JP 2004-110893 A

  The problem to be solved is that the conventional technique cannot guarantee the order and originality of general distribution of electronic documents.

  The object of the present invention is to solve these problems of the prior art. For example, when an electronic document is exchanged between an issuer (transmission source) and a reception source (transmission destination), the electronic document received at the reception source is the issuer. It is possible to respond to non-repudiation by proving that it is the same as the stored electronic document, and at the same time, finding missing receipts for multiple different electronic documents received by the recipient and the order of receiving electronic documents The amount of data in the network when exchanging electronic documents can be reduced.

  In order to achieve the above object, in the present invention, when an electronic document is exchanged between an issuer (source device) and a recipient (destination device), both are the same as the stored electronic documents. Get the generation of the hash value to prove Specifically, the first hash value is generated from the first electronic document and stored in the storage device, and the second hash value is generated by assigning the first hash value to the second electronic document. The generation of the hash value by assigning the previous hash value to the plurality of electronic documents including the third electronic document thereafter and the storage in the storage device are sequentially repeated. Then, it is confirmed that the final hash values created in each match. In particular, the issuer (transmission source device) assigns identification information such as the processing date and time to each electronic document, and generates a hash value for the electronic document to which such identification information is assigned. Furthermore, the generated hash value is disclosed on the network.

  According to the present invention, it is possible to guarantee the order as well as the legitimacy of a plurality of electronic documents. For example, when operating an electronic application or electronic bidding in a local government, a single shared use center is used, By applying it to an operation system that distributes to a plurality of local governments and distributes it, it is possible to confirm whether the electronic document from the center side has been sent to the local government apparatus correctly and in order. Further, since the order of the exchanged electronic documents can be guaranteed, it is possible to prevent denial that the original document creator has not sent the electronic documents. Also, by releasing the hash value as a message digest on the homepage, the order and existence of the received electronic document can be guaranteed, and the original text creator and the receiving organization can be prevented from being rejected. In addition, by issuing receipts for electronic documents delivered for a certain period of time together with the final hash value, the amount of data on the network line for exchanging (exchange) electronic documents can be reduced.

  The best mode for carrying out the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a first configuration example of an apparatus and system for performing hash value generation management according to the present invention, and FIG. 2 is a flowchart showing a first hash value generation management procedure example according to the present invention. It is.

  In FIG. 1, the present invention is applied to an operation system in a form in which each electronic document is distributed and distributed to a plurality of local governments using a common use center when electronic applications and electronic bidding are operated in local governments. In this example, each of 1, 2a to 2c, 3a, and 3b includes a CPU (Central Processing Unit), a main storage device (main memory), a display device, an input device, an external storage device, a peripheral device, and the like. After installing the program and data recorded in a storage medium such as a CD-ROM via an optical disk drive device as a peripheral device in the external storage device, the external storage device is transferred to the main memory. The processing of each processing unit is executed by processing by the reading CPU.

  Hereinafter, description will be made assuming that 1 is a shared use center device, 2a to 2c are personal A to C side terminal devices, and 3a and 3b are group X and Y side devices.

  The personal A to C side terminal devices 2 a to 2 c are composed of personal computers or the like, and transmit electronic documents A to C created by operation by an unspecified user to the shared use center device 1 via the Internet 4. The shared use center device 1 centrally accepts each electronic document transmitted from the personal A to C side terminal devices 2a to 2c (circle numbers 1, 3, and 5 in FIG. 1), and accepts each electronic document. The distribution is distributed to the local government organizations X and Y side devices 3a and 3b designated as the transmission destination via the network 5 including the Internet or a dedicated network. Here, the description will be made assuming that the distribution is distributed to the group X side device 3a.

  When the group X side apparatus 3a receives the electronic documents A to C distributed from the shared use center apparatus 1 (circle numbers 2, 4, and 6 in FIG. 1), the hash value realized by executing the program First, a hash value (HA) of the electronic document A received first is generated by the generation function and stored in the storage device (circled number 7 in FIG. 1). Thereafter, the next received electronic document B and the hash value (HA) of the previously generated electronic document A are combined to generate the hash value (HB) (circled number 8 in FIG. 1), and further Next, the received electronic document C and the previously generated hash value (HB) are combined to generate the hash value (HC) (circled number 9 in FIG. 1).

  In this way, the group X and Y side devices 3a and 3b use the provided hash value generation function to generate a time series of hash values for the set of the hash value of the previous electronic document and the electronic document received this time. Repeat. Then, among the electronic documents received within a certain period of time, the hash value of the final electronic document is added with the signature information of the organization X which is the identification information of the own device, and the shared use center device which is the issuing source is given as a receipt 1 is transmitted via the network 5 (circled number 10 in FIG. 1).

  Upon receiving the receipt (final hash value + signature information) from the organization X side device 3a, the shared use center device 1 stores it in the storage device (circled number 11 in FIG. 1), and the organization X Similarly to the side device 3a, the hash value generation function realized by executing the program generates the hash value of each electronic document sent to the group X side device 3a of the signature according to the same rules as the group X side device 3a. Each of the electronic documents sent to the group X side device 3a is verified by matching the same by the discrimination function realized by executing the program, and the shared use center device 1 that is the issuer It is guaranteed that the electronic document is the same as the electronic document stored in, and the distribution order of each electronic document is also guaranteed.

  An example of the processing procedure relating to the above hash value generation and management will be described with reference to FIG. Here, in the case where an individual applies electronically to a plurality of organizations, the application is accepted by the shared use center device 1 in the electronic document reception distribution organization which is the representative organization, and the electronic document received by the representative organization is under the umbrella. An example of processing in a system in which the destinations of each electronic document are viewed and distributed to the organization X and Y side devices 3a and 3b of the organization is shown.

  When the shared use center device 1 receives the electronic document A sent from the personal A-side terminal device 2a (step S201), the shared use center device 1 confirms that the destination of the electronic document A is the organization X (step S202). The electronic document A is automatically sorted and distributed to the side device 3a (step S203).

  When the group X side device 3a receives the electronic document A distributed from the shared use center device 1 (step S204), the hash value (HA) of the electronic document A is generated and stored in the storage device (step S205). . For example, a 128-bit hash value is generated for an arbitrary length using an algorithm for generating an MD5 (Message Digest) hash value. Thereafter, the organization X side device 3a waits for the electronic document from the shared use center device 1 for a predetermined period (step S206).

  Meanwhile, the shared use center device 1 repeats the processing of steps S201 to S203, and the organization X side device 3a repeats the processing of steps S204 to S206.

  For example, when the shared use center device 1 receives the electronic document B sent from the personal B-side terminal device 2b (step S201), it confirms that the destination of the electronic document B is the organization X (step S202). The electronic document B is automatically distributed to the group X side apparatus 3a (step S203), and the group X side apparatus 3a receives the electronic document B distributed from the shared use center apparatus 1 (step S204). A hash value for document B is generated. At this time, the organization X side apparatus 3a generates a new hash value (HB) in a form in which the previously generated hash value (HA) is assigned to the electronic document B and is stored in the storage device (step). S205).

  Further, when the shared use center device 1 receives the electronic document C sent from the personal C-side terminal device 2c (step S201), it confirms that the destination of the electronic document C is the organization X (step S202). The electronic document C is automatically distributed to the group X side apparatus 3a (step S203), and the group X side apparatus 3a receives the electronic document C distributed from the shared use center apparatus 1 (step S204). A new hash value (HC) is generated and stored in the storage device in a form in which the hash value (HB) generated previously is added to the electronic document C and the hash value for the document C is collected (step S205).

  In this way, when the group X side device 3a acquires the hash value of the electronic document (A, B, C) sequentially received from the shared use center device 1, the hash value of the electronic document received and generated immediately before And acquiring and storing the hash values in a time series in a form that summarizes the electronic documents that are received this time and the hash values are acquired.

  When the group X side apparatus 3a reaches a predetermined repetitive operation period (one day, one week, one month, etc.) (step S206), the hash value (finally generated and stored) ( HC) is transmitted to the shared use center device 1 (step S207). At this time, the hash value (HC) is encrypted and transmitted.

  When the shared use center device 1 receives the hash value (HC) from the organization X side device 3a (step S208), the shared use center device 1 stores the hash value (HC) in the storage device (step S209) and the organization X side device 3a. Similarly, a hash value (HC ′) of each electronic document is generated in time series for the electronic document distributed to the group X side apparatus 3a during the repeated operation period (step S210), and each hash value (HC) , HC ′) and compared (step S211), it is determined whether or not they match (step S212). It can be confirmed whether or not all the electronic documents distributed during the repeated operation period have arrived reliably from the shared use center device 1 to the group X side device 3a depending on whether or not they match (step S213). S214).

  Next, another embodiment for carrying out the present invention will be described with reference to FIGS. FIG. 3 is a block diagram showing a second configuration example of an apparatus and system for performing hash value generation management according to the present invention, and FIG. 4 is a flowchart showing a second hash value generation management procedure example according to the present invention. It is.

  In the example shown in FIG. 3, in the same environment as the system configuration shown in FIG. 1, the shared use center device 1 a receives the electronic documents A to C from the individual A to C side terminal devices 2 a to 2 c ( When receiving the reception times A to C) and distributing each electronic document A to C to the group X side device 3c, the acquired time information is added, and each electronic device in the shared use center device 1a and the group X side device 3c Hash values are generated for the documents A to C including the reception times A to C.

  That is, the personal A to C side terminal devices 2 a to 2 c transmit the electronic documents A to C created by the operation of an unspecified user to the shared use center device 1 a via the Internet 4. The shared use center device 1a centrally accepts each electronic document transmitted from the personal A to C side terminal devices 2a to 2c (circle numbers 1, 5, and 9 in FIG. 3), and receives each electronic document respectively. Is distributed and distributed via the network 5 to the local organization X side apparatus 3c designated as the transmission destination.

  The group X side device 3c receives each of the electronic documents A to C to which the reception times A to C are given, distributed from the shared use center device 1a (circle numbers 2, 6, and 10 in FIG. 3). . Then, the hash value generation function realized by executing the program first generates the hash value (HAA) of the electronic document A received first in a form in which the reception time A is collected and stores it in the storage device ( Circle number 3) in FIG. Then, the generated hash value (HAA) is published as a message digest (MDA) on the Internet homepage (circled number 4 in FIG. 3).

  Thereafter, the group X side apparatus 3c uses the provided hash value generation function to receive the next received electronic document B, the reception time B of the electronic document B, and the hash value (HAA) of the electronic document A generated earlier. And the hash value (HBB) is generated and stored (circled number 7 in FIG. 3), published as a message digest (MDB) on the homepage (circled number 8 in FIG. 3), and Next, the received electronic document C, the reception time C of the electronic document C, and the hash value (HBB) of the previously generated electronic document B are combined to generate and store the hash value (HCC). (Circle number 11 in FIG. 3), a message digest (MDC) is published on the homepage (circle number 12 in FIG. 3).

  In this way, the organization X side apparatus 3c repeats the generation of the hash value for the set of the hash value of the previous electronic document and the electronic document received this time in a time series including each reception time. As in the embodiment in FIG. 1, the organization X side device 3c uses the hash value of the final electronic document among the electronic documents received within a certain period of time as the signature of the organization X, which is identification information of the device itself. The information is added and sent as a receipt to the shared use center device 1a that is the issuer via the network 5. The shared use center device 1a receives the receipt (final hash value + signature) from the organization X side device 3c. Information) is stored in the storage device, and the hash value generation function provided therein generates the hash value of each electronic document sent to the organization X side device 3c according to the same rules as the organization X side device 3c. Then, each electronic document sent to the organization X side device 3c is stored in the own shared use center device 1a, which is sent to the organization X side device 3c. Guaranteed to be the same as the electronic document, and also ensures the distribution order of the electronic document.

  An example of the processing procedure relating to generation and management of the hash value including the reception time of the electronic document will be described with reference to FIG. Similar to the example of FIG. 2, here, in the case where an individual electronically applies to a plurality of organizations, the application is accepted by the shared use center apparatus 1a in the electronic document reception distribution organization which is the representative organization, and the representative organization The example of a process in the system which distributes the received electronic document to the organization X side apparatus 3c of the organization under the control of the destination of each electronic document is shown.

  When the shared use center device 1a receives the electronic document A sent from the personal A-side terminal device 2a (step S401), the shared use center device 1a confirms that the destination of the electronic document A is the organization X (step S402). The electronic document A is automatically distributed and distributed to the side device 3c (step S403). At this time, the shared use center device 1a acquires the time A when the electronic document A is received from the personal A-side terminal device 2a, assigns it to the electronic document A, and transmits it to the group X-side device 3c.

  When the group X side apparatus 3c receives the electronic document A to which the reception time A is given from the shared use center apparatus 1a (step S404), for example, using an algorithm for generating an MD5 hash value, A hash value (HAA) paired with the reception time A is generated and stored in the storage device (step S405).

  Further, in this example, the organization X side device 3c discloses the generated hash value (HAA) as a message digest (MDA) on a homepage on the Internet (step S4051). Thereafter, the group X side device 3c waits for delivery of the electronic document from the shared use center device 1a for a predetermined period (step S406).

  Meanwhile, the shared use center device 1a repeats the processing of steps S401 to S403, and the organization X side device 3c repeats the processing of steps S404 to S406.

  For example, when the shared use center device 1a receives the electronic document B sent from the personal B terminal device 2b (step S401), it confirms that the destination of the electronic document B is the organization X (step S402). The group X side apparatus 3c distributes the electronic document B with the reception time B (step S403), and the group X side apparatus 3c receives the electronic document B with the reception time B from the shared use center apparatus 1a. (Step S404), a hash value for the set of the electronic document B and the reception time B is generated. At this time, the organization X-side device 3c generates a new hash value (HBB) in a form in which the previously generated hash value (HAA) is assigned to the electronic document B and the reception time B, and is stored in the storage device. Store (step S405). Then, the group X side device 3c publishes the generated hash value (HBB) as a message digest (MDB) on a homepage or the like on the Internet (step S4051).

  Further, when the shared use center device 1a receives the electronic document C sent from the personal C-side terminal device 2c (step S401), it confirms that the destination of the electronic document C is the organization X (step S402). The group X side apparatus 3c distributes the electronic document C with a reception time C (step S403), and the group X side apparatus 3c receives the electronic document C with the reception time C from the shared use center apparatus 1a. (Step S404), the hash value for the electronic document C is added to the set of the electronic document C and the reception time C with the previously generated hash value (HBB), and a new hash value ( HCC) is generated and stored in the storage device (step S405). Then, the organization X side device 3c publishes the generated hash value (HCC) as a message digest (MDC) on a homepage or the like on the Internet (step S4051).

  In this way, when the group X side device 3c acquires the hash values of the electronic documents (A, B, C) sequentially received from the shared use center device 1a, the hash value of the electronic document received and generated immediately before In this manner, the hash value is acquired and stored in a time series in a form in which the electronic document that is received this time and the hash value is acquired and the reception time given to the electronic document are collected, and the electronic document is repeatedly disclosed on the network.

  When the group X side apparatus 3c reaches a predetermined repetitive operation period (one day, one week, one month, etc.) (step S406), the hash value (finally generated and stored) ( HCC) is transmitted to the shared use center device 1a (step S407). At this time, the hash value (HCC) is encrypted and transmitted.

  When the shared use center device 1a receives the hash value (HCC) from the organization X side device 3c (step S408), the shared use center device 1a stores the hash value (HCC) in the storage device (step S409). Similarly, a hash value (HCC ′) of each electronic document is generated in time series for the electronic document distributed to the organization X side apparatus 3c during the repeated operation period (step S410), and each hash value (HCC) , HCC ′) and compare them (step S411) to determine whether or not they match (step S412). It can be confirmed whether or not all the electronic documents distributed during the repeated operation period have arrived reliably from the shared use center device 1a to the organization X side device 3c depending on whether or not they match (step S413, step S413). S414).

  Further, in this example, each hash value (HAA, HBB, HCC) generated by the organization X side device 3c is displayed in time series on the public homepage as a message digest (MDA, MDB, MDC), and on the network. Since it is open to the public, for example, even if the person B denies the electronic document B, it is a well-known fact that the electronic document B is required to generate a message digest as “MDB”. Since verification is also possible, it cannot be denied. This is effective for an electronic application system that collects socially important documents.

  Further, in this example, hashing is performed on a set in which the reception time is added to the electronic document, and it is effective for application / notification that determines the validity depending on the arrival time of the electronic document. Whether or not the electronic document A is valid can be verified after the fact, and is effective for a registration system or the like that requires the order of application and notification.

  As described above with reference to FIGS. 1 to 4, in this example, the shared use center device 1, 1 a as a transmission source computer device that transmits an electronic document via the network 5, and the transmission source computer device include In the electronic document management technology of the system composed of the organization X, Y side devices 3a, 3b, 3c as transmission destination computer devices that receive the transmitted electronic document via the network 5, the organization X, Y side devices 3a, 3b, 3c As a process using the program executed in step 1, the hash value of the electronic document received from the shared use center device 1, 1a is generated and stored in the storage device, and the next received electronic document is stored in the storage device. The procedure of generating the next hash value by assigning the stored hash value and storing it in the storage device, and sequentially receiving the plurality of electronic documents received last time A procedure for providing a hash value of the child document to generate a new hash value and transmitting the final hash value stored in the storage device to the shared use center device 1, 1a. When the final hash value transmitted from the group X, Y side devices 3a, 3b, 3c is received as a process using the program to be executed, all the processes up to the last transmitted to the group X, Y side devices 3a, 3b, 3c The same hash value is generated for the electronic document of the group X, Y side devices 3a, 3b, 3c and the final hash value is stored in the storage device, and the generated final hash value and the group X, Y By comparing the final hash value transmitted from the side devices 3a, 3b, and 3c, all the electronic documents up to the last are correctly transmitted in order to the group X and Y side devices 3a, 3b, and 3c. Falcon It is provided a step of discriminating.

  Further, as a process of the shared use center device 1, 1 a, a procedure for giving identification information such as a reception time to each electronic document and transmitting it to the group X, Y side devices 3 a, 3 b, 3 c is provided. The devices 1 and 1a and the group X and Y side devices 3a, 3b, and 3c generate a hash value for the electronic document including the reception time information.

  As a result, according to this example, it is possible to guarantee the originality of the exchanged electronic document and the order of the exchanged document. In addition, the fact that the order of exchanged electronic documents can be guaranteed in this way can prevent denial that the original document creator has not sent the electronic document. In addition, the reception time of the received electronic document is encrypted together with the received electronic document, and the hash value is disclosed on the homepage as a message digest, thereby guaranteeing the order and existence of the received electronic document, It is possible to prevent non-repudiation of the receiving organization. Also, by collecting receipts for electronic documents delivered for a certain period of time together with the final hash value and signature, there is no exchange of data in units of electronic documents, and the amount of data on the network line that exchanges (exchanges) electronic documents Can be reduced.

  In addition, this invention is not limited to the example demonstrated using FIGS. 1-4, In the range which does not deviate from the summary, various changes are possible. For example, in this example, MD5 is used to generate a hash value, but SHA-1 (SecureHash Algorithm 1) or the like may be used.

  In this example, there is an organization (publisher) that accepts electronic documents created by a personal computer, etc. from a plurality of unspecified persons via a network, etc. As an example, we have explained the application in the shared use model of the so-called general application system for electronic applications in public offices and local governments that distributes and distributes documents received via a network etc. to multiple organizations (recipients). As will be described below, it is also effective for ensuring the validity and order of a plurality of electronic documents transmitted and received between one-to-one transmission / reception terminals.

  For example, as a hash value generation management method by a computer device using a program, a first hash value is generated from a first electronic document and stored in a storage device, and for a second electronic document, The first hash value is assigned and the second hash value is generated and stored in the storage device. Further, the generation of hash values of a plurality of electronic documents including the third electronic document is similarly performed. Together with the previously calculated hash value, generation of the hash value and storage in the storage device are sequentially repeated. In this way, a plurality of electronic data transmitted and received between one-to-one transmission / reception terminals by generating a new hash value by assigning a previously generated hash value to a plurality of electronic documents in a predetermined order. It is possible to guarantee the order of documents as well as their correctness.

  3 and 4 are application examples in the shared use model, in which the reception time of the electronic document is given to the electronic document and a hash value is generated for the pair. When applying to a transmission / reception model between one terminal, on the transmission side, the transmission time of the electronic document is assigned to the electronic document as identification information, and a hash value is generated for the electronic document to which the transmission time is assigned. It may be done.

  In addition, in the examples of FIGS. 1 to 4, the delay problem in the network 5 is not particularly described. However, in the actual network 5, a transfer delay may occur. The second electronic document (B) generated later than the first electronic document (A) may reach the receiving side devices (group X side devices 3a and 3c). In such a case, the final hash values do not match. In order to deal with such a problem, the distribution source may add serial number information to each electronic document in the order of transmission via the network, and include the serial number information as a hash value generation target.

  The computer configuration example of this example may also be a computer configuration without a keyboard or optical disk drive. In this example, an optical disk is used as a recording medium, but an FD (Flexible Disk) or the like may be used as a recording medium. As for the program installation, the program may be downloaded and installed via a network via a communication device.

It is a block diagram which shows the 1st structural example of the apparatus and system which perform hash value production | generation management concerning this invention. It is a flowchart which shows the example of a 1st hash value production | generation management procedure concerning this invention. It is a block diagram which shows the 2nd structural example of the apparatus and system which perform hash value production | generation management concerning this invention. It is a flowchart which shows the 2nd example of a hash value production | generation management procedure concerning this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1, 1a: Shared use center apparatus, 2a-2c: Personal AC terminal apparatus, 3a, 3c: Group X side apparatus, 3b: Group Y side apparatus, 4: Internet, 5: Network.

Claims (7)

An electronic document management system comprising an electronic document transmission source device, a transmission destination device, and a center device that distributes a plurality of electronic documents transmitted from the transmission source device to the transmission destination device,
The transmission destination device and the center device are
The first hash value is generated from the first electronic document, and the second hash value is generated from the document obtained by assigning the first hash value to the second electronic document. Hash value generation means for generating a hash value for,
The center device assigns reception time information to a plurality of electronic documents received from the transmission source device and stores them in a storage device, and also receives each electronic document to which the reception time information is attached in the order received by the transmission destination device. Send
The destination device, received by the hash value generation unit equipped, each hash value for a set of the respective electronic document and the received time information given to the electronic document received within a predetermined period of time from the center device It is repeatedly generated in time order in time series, and the final hash value of each generated hash value is transmitted to the center device,
When the center device receives the final hash value from the transmission destination device, each of the center devices transmitted to the transmission destination device within the predetermined period stored in the storage device by the provided hash value generation means Each hash value for a set of an electronic document and reception time information assigned to each electronic document is repeatedly generated in time series in the order of reception time , and the final hash value of the generated hash values and the transmission destination device And comparing the final hash value received from the first hash value, it is determined that all electronic documents transmitted within the predetermined period to the transmission destination device are correctly sent in order. Electronic document management system. The electronic document management system according to claim 1,
The center device is
The serial number information is given to the electronic document in the order received via the network,
The center device and the destination device are
An electronic document management system characterized in that an electronic document to which the serial number information and the reception time information are added is a hash value generation target. An electronic document management system according to claim 1 or 2,
The center apparatus publishes the generated hash value as a message digest on the network.   A program for causing a computer to function as the center device and the transmission destination device in the electronic document management system according to any one of claims 1 to 3. An electronic document management method for an electronic document management system comprising an electronic document transmission source device, a transmission destination device, and a center device that distributes a plurality of electronic documents transmitted from the transmission source device to the transmission destination device,
The transmission destination device and the center device are
The first hash value is generated from the first electronic document, and the second hash value is generated from the document obtained by assigning the first hash value to the second electronic document. Hash value generation means for generating a hash value for,
The center device assigns reception time information to a plurality of electronic documents received from the transmission source device and stores them in a storage device, and also receives each electronic document to which the reception time information is attached in the order received by the transmission destination device. Send
The destination device, received by the hash value generation unit equipped, each hash value for a set of the respective electronic document and the received time information given to the electronic document received within a predetermined period of time from the center device It is repeatedly generated in time order in time series, and the final hash value of each generated hash value is transmitted to the center device,
When the center device receives the final hash value from the transmission destination device, each of the center devices transmitted to the transmission destination device within the predetermined period stored in the storage device by the provided hash value generation means Each hash value for a set of an electronic document and reception time information assigned to each electronic document is repeatedly generated in time series in the order of reception time , and the final hash value of the generated hash values and the transmission destination device And comparing the final hash value received from the first hash value, it is determined that all electronic documents transmitted within the predetermined period to the transmission destination device are correctly sent in order. Electronic document management method. The electronic document management method according to claim 5,
The center device is
The serial number information is given to the electronic document in the order received via the network,
The center device and the destination device are
An electronic document management method, characterized in that an electronic document to which the serial number information and the reception time information are added is a hash value generation target. The electronic document management method according to claim 5, wherein:
The center apparatus publishes the generated hash value as a message digest on the network.

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