JP2003006361A - Electronic seal impression system and recording medium which records electronic seal impression program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic seal impression system, which permits visual presentment of an electronic signature and confirmation of correctness, and a recording medium which records an electronic seal impression program. SOLUTION: The electronic seal impression system is provided with an electronic seal impression data recording means which records an electronic seal impression data adding information of an electronic certification to a seal impression image data; a sealing means which extracts the seal impression image data and electronic certification information from the electronic seal impression data of a sealer, and adds them to electronic documents as seal impression objects; an electronic signature means in which the electronic signature is put to the electronic documents to which the sealing impression object is added, when information of the sealer's electronic certification and the electronic certification information included in the seal impression object added to the electronic documents are consistent; and a seal impression delete means which deletes the seal impression object added to the electronic documents, when information of the sealer's electronic certification and the electronic certification information included in the seal impression object added to the electronic documents are not consistent and the electronic signature is not put to the electronic documents, to which the sealing impression object is added.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic seal stamp system for imprinting seal image data on an electronic document and a recording medium recording the electronic seal stamp program.

[0002]

2. Description of the Related Art In recent years, due to the rapid spread of computer network technology, various documents that have been exchanged on paper within and between companies are digitized, and the digitized electronic documents are sent to e-mail, the Internet, intranet, etc. By exchanging information on the network using, the business transactions and the approval / approval work on the network are routinely performed. Along with this, digital signature technology has become widespread as a technology for authenticating the validity of electronic documents exchanged on a network.

Electronic signatures are generally public key cryptographic technology (PKI: P
ublic Key Infrastructure) is realized by using a pair of private key and public key, and is a ciphertext in which a compressor generated from an electronic document is encrypted with the private key. Then, this ciphertext can be decrypted only with the public key corresponding to the secret key. For example, A gives a digital signature to an electronic document created by A, who is the sender, and
To send. When B receives the electronic document sent from A, B decrypts the electronic signature (ciphertext) of the received electronic document using A's public key, and if the decryption is successful, the received electronic document is created. The person can definitely confirm that it is A. Also, by generating a compressor from the received electronic document and comparing the compressor with the compressor obtained by decoding the digital signature applied to the received electronic document, it is possible to check whether the document has been tampered with. You can check. In other words, the electronic signature plays the role of personal authentication that authenticates the legitimacy of the document creator and the role of document authentication that authenticates the legitimacy of the document contents, and is equivalent to a paper-based seal stamp (imprint). .

Further, a seal stamp certificate issued by a public institution is used to specify that the seal impression of the seal stamp on the paper base belongs to the seal stamper (document creator) himself, and the seal stamp certificate is confirmed. As a result, the legitimacy of the seal stamped on the document is also verified. An electronic certificate issued by a reliable Certificate Authority (CA) is used to certify that the electronic signature in an electronic document, which is equivalent to this seal stamp certificate, belongs to the signer (document creator) himself. There is a book. This digital certificate includes the private key used for digital signature, public key, private key / public key owner name, certification authority name (digital certificate issuer name), digital certificate issue date, digital certificate The information regarding the expiration date and the like is recorded, and the legitimacy of the electronic signature given to the electronic document is verified by checking the information of the electronic certificate.

Then, the enforcement of the "Law concerning electronic signature and authentication business" (promulgated on May 31, 2000, 20
(Enforced April 1, 2001), digital signatures made using digital certificates issued by public certificate authorities are recognized in the real world as having the same effect as a paper-based seal (imprint). Is starting to appear. Due to the importance of digital signatures in recent years, recently, in various applications such as word processors and spreadsheets, the above-mentioned digital certificate is obtained from a CA (Certificate Authority) and used. An electronic signature has been developed and is being put to practical use.

[0006] On the other hand, there is known an electronic seal stamp system in which an actual seal stamp is used as image data and the seal image data is stamped on an electronic document. Since this electronic seal stamp system can realize the act of stamping an electronic document as well as paper and can confirm the stamped document on the display screen, use such an electronic seal stamp system. As a result, the approval / approval work that was performed by imprinting on conventional paper can be carried out on the network without any discomfort. It can be said that such an electronic seal stamp system is one of the effective means for digitizing many operations that require a seal stamp in the real world.

[0007]

In the real world, the imprint imprinted on a paper or electronic document is generally recognized as playing a role of personal authentication and document authentication. Therefore, a person who browses the imprinted document cannot see it. The impression that looks like gives a high degree of reliability and security. However, since there is no visual representation in the digital signature, the digital signature surely fulfills the role of personal authentication and the role of document authentication, but it is difficult to give the viewer reliability and security. .

Therefore, the present invention solves the above-mentioned problems and realizes a visual representation of a digital signature by the seal image data by interlocking the imprint processing and the digital signature processing of the seal image data, and further by the seal image data. An object of the present invention is to provide an electronic seal stamp system capable of confirming the validity of an electronic signature and a recording medium recording an electronic seal stamp program for realizing the electronic seal stamp system.

[0009]

In order to solve the above-mentioned problems, the invention according to claim 1 is an electronic seal stamp data obtained by adding electronic certificate information extracted from an electronic certificate to seal image data. An electronic seal stamp data storage means for storing the seal imprint image data and the electronic certificate information from the seal imprinter's electronic seal stamp data retrieved from the electronic seal stamp data storage means. The stamping means added to the electronic document as an object, the digital certificate information extracted from the stamper's digital certificate, and the digital stamp information included in the seal stamp object added to the electronic document match the seal stamp An electronic signature means for applying an electronic signature to the electronic document to which the object is added by using the electronic certificate of the stamper, and the electronic certificate of the stamper. When the electronic certificate information is not matched with the electronic certificate information included in the seal stamp object added to the electronic document, and the electronic signature is not applied to the electronic document to which the seal stamp object is added The electronic seal stamp system includes a seal stamp deleting unit that deletes a seal stamp object added to the electronic document.

According to the invention of claim 2, in the electronic seal stamp system of claim 1, when the content of the stamped electronic document is changed, the seal stamp deleting means changes the stamped electronic document to the changed content. It is an electronic seal stamp system that deletes an added seal stamp object.

According to the third aspect of the invention, an electronic seal stamp data creating process for adding electronic certificate information extracted from an electronic certificate to seal image data to create and store electronic seal stamp data, An imprint that extracts seal imprint image data and electronic certificate information from the seal imprinter's electronic seal stamp data retrieved from the storage means that stores the seal imprint data and adds the seal imprint image data and the electronic certificate information to the electronic document as a seal imprint object. When the processing and the electronic certificate information extracted from the sealer's electronic certificate and the electronic certificate information included in the seal stamp object added to the electronic document match, the seal stamp object is added to the electronic document. On the other hand, an electronic signature process of applying an electronic signature using the electronic certificate of the stamper, electronic certificate information extracted from the electronic certificate of the stamper, and the digital signature The seal stamp object added to the electronic document when the electronic signature information is not given to the electronic document to which the seal stamp object is added because the electronic certificate information included in the seal stamp object added to the document does not match It is a recording medium in which an electronic seal stamp program for causing a computer to execute a seal stamp deleting process for deleting a.

Further, according to the invention of claim 4, in the recording medium of claim 3, when the content of the stamped electronic document is changed, the seal stamp added to the stamped electronic document whose content is changed. It is a recording medium recording an electronic seal stamp program for causing a computer to execute a process of deleting an object.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As an embodiment of the present invention, an example in which the electronic seal stamp system of the present invention is applied to a corporate network will be described below. FIG. 1 is a block diagram of the entire system of the present embodiment, in which a server 1 and a plurality of client terminals 2 are connected via a network 3. The network 3 is a network system such as a LAN (local area network), the Internet, or an intranet. The number of client terminals 2 existing on the network 3 is not particularly limited.

The server 1 is used by a system administrator, and comprises an input device 4, a display device 5, a control device 6 and a storage device 7, as shown in FIG. The input device 4 is composed of a keyboard, a mouse and the like for inputting various data and commands required for creating electronic seal stamp data of each user, and the display device 5 is for displaying various display data. It is composed of a CRT display, a liquid crystal display, or the like. The control device 6 is composed of a microprocessor that executes various processes, a memory such as a ROM and a RAM that stores various programs and data that control the operation of the microprocessor, and various types of data input by the input device 4. Various data processes such as a process for creating electronic seal stamp data of each user are executed based on the data and commands. The storage device 7 is composed of a hard disk device, a magneto-optical disk device, etc., and stores an electronic seal stamp data creation program, electronic seal stamp data for all users of this system, and electronic certificates for all users of this system. To do.

Here, the electronic certificate stored in the storage device 7 is issued by a certificate authority (CA), and each user of this system obtains this electronic certificate by himself / herself. It is a thing. This digital certificate includes the owner name of the private key / public key used for the digital signature, the issuer name (certificate authority name) of the digital certificate, the issue date of the digital certificate, the expiration date of the digital certificate, etc. Information is recorded. A certificate authority (CA) that issues digital certificates
eTrust (Trusted Third Part)
There is a company that issues electronic certificates called y: third party certification body) and an electronic certificate issuing system that is independently built in-house called private CA.

As shown in FIG. 3, the client terminal 2 includes an input device 11, a display device 12, a control device 13, and a storage device 1.
A personal computer or workstation composed of 4 allows users of this system to create electronic documents using application software such as word processors and spreadsheets, and apply imprint processing of seal image data to the created electronic documents. This is for performing or viewing a stamped document.

The input device 11 is composed of a keyboard and a mouse for inputting various data and commands required for electronic document creation processing and seal imprint image data imprint processing, and the display device 12 displays various display data. It is composed of a CRT display or a liquid crystal display for displaying. The control device 13 is composed of a microprocessor that executes various processes, a memory such as a ROM and a RAM that stores various programs and data that control the operation of the microprocessor, and various types of data input by the input device 11. Various data processes such as electronic document creation process and seal image data imprint process are executed based on the data and commands. The storage device 14 is composed of a hard disk device, a magneto-optical disk device, or the like, and stores an electronic document creation program, an electronic seal stamp program, or the like.

Next, the procedure of the electronic seal stamp data creating process in the server 1 will be described with reference to the flowchart shown in FIG. First, the administrator operates the input device 4 to input a command to start the electronic seal stamp data creation process (step S
1), the control device 6 activates the electronic seal stamp data creating means 8 based on the command (step S2). Next, the administrator stores the imprint of each user as image data in bitmap format, TIFF format, or the like on an FD or CD-R.
The FD drive or C that the server 1 has OM
It is set in the D-ROM drive, and the input device 4 is operated to input the read command of the seal image data of each user stored in the FD or the CD-ROM (step S3). At this time, the seal imprint image data of each user stored in the FD or the CD-ROM may be read all at once, or may be read for each user. Incidentally, the imprint image data of each user can be read by using an image scanner, a digital camera or the like.

Then, the electronic seal stamp data creating means 8 of the control device 6 executes the F command based on the seal image data read command.
The imprint image data of each user stored in the D or CD-ROM is read (step S4), and when the process is completed, the electronic seal stamp data creation screen shown in FIG. 5 is displayed on the display device 5. This electronic seal stamp data creation screen displays the user information including the user name of the owner of the seal image data and the password corresponding to the user and the owner of the seal image data for the seal image data read in the step S4. A seal imprint display area 19 for displaying information one by one of the seal imprint image data read in the step S4, which is a target for creating the electronic seal stamp data, for setting information related to the digital certificate owned by A user name input area 20 and a password input area 21 for setting user information for the seal imprint image data displayed on 19, and electronic certificate information for the seal imprint image data displayed on the seal imprint display area 19 are set. And a digital certificate selection area 22 for selecting a digital certificate required for In this electronic certificate selection area 22, by clicking the button 23, the electronic certificates for all users of the system stored in the electronic certificate storage means 10 are displayed in a list format. .

The administrator operates the input device 4 to input the user name and password corresponding to the seal imprint image data displayed in the seal imprint display area 19 of the electronic seal stamp data creation screen (FIG. 5) to the user name input area 20 respectively. While inputting the password in the password input area 21, select the electronic certificate corresponding to the imprint image data displayed in the imprint display area 19 in the electronic certificate selection area 22 and click the OK button 24 when the work is completed. Then, a command for creating the electronic seal stamp data is input (step S6). Then, the electronic seal stamp data creating means 8 displays the electronic seal stamp data creating screen (FIG. 5).
The user name input area 20 and the password input area 21 are added to the seal imprint image data displayed in the seal imprint display area 19 of FIG.
The electronic seal stamp data is created by adding the user information consisting of the user name and password entered in to and the electronic certificate information extracted from the electronic certificate selected in the electronic certificate selection area 22 to the electronic seal stamp data. The data is stored in the electronic seal stamp data storage means 9 of the storage device 7 (step S7).
The electronic certificate information added to the seal imprint image data is the owner name of the private key / public key in the information recorded in the electronic certificate stored in the electronic certificate storage means 10 (electronic The certificate owner name), the name of the electronic certificate issuer, and the expiration date of the electronic certificate are set, but the electronic certificate information can be arbitrarily selected from the information recorded in the electronic certificate. .

Here, an example of the electronic seal stamp data created in the step S7 is shown in FIG. The seal imprint image data is managed on the server 1 side as electronic seal stamp data in which user information including electronic certificate information and a user name / password is set, and the user authority of the electronic seal stamp data is managed by the user information.

If the setting of the user information and the electronic certificate information is not completed for all the imprint image data read in the step S4 at the time when the processing of the step S7 is completed, (No in step S8), the seal imprint image data in which the user information and the electronic certificate information are not set is displayed in the seal imprint display area 19 of the electronic seal stamp data creation screen (FIG. 5) displayed on the display device 5, and the user name is displayed. Input area 20 and password input area 21
Is blank, the administrator sets the user information and digital certificate information again. Then, when the setting of the user information and the electronic certificate information for all the read seal imprint image data is completed (Yes in step S8), the electronic seal stamp data storage means 9 of the storage device 7 stores all the users' electronic data. Since the seal stamp data has been stored, the process for creating the electronic seal stamp data is completed (step S9). After this, the administrator operates the input device 4 to input a command to end the electronic seal stamp data creation process, complete the electronic seal stamp data creation process, and use the electronic seal stamp data of all users of the system. Communicate user information for.

Next, the procedure of the imprinting process of the seal image data in the client terminal 2 will be described with reference to the flowchart shown in FIG. First, the stamper operates the input device 11 of the one client terminal 2 existing on the network 3 to display the self-created electronic document to be stamped on the display device 12 (step S101). An example of the display screen of the electronic document is shown in FIG. This electronic document is installed in the client terminal 2, "Microso
ft Word "(product name of Microsoft Corporation) and" Mi
It is created by using a commercially available application such as word processor or spreadsheet such as "Microsoft Excel" (product name of Microsoft Corporation), and a stamp button 25 for inputting a stamp command on the screen displaying this electronic document.
Is displayed.

Next, the stamper operates the input device 11 to specify the stamp position on the electronic document displayed on the display device 12, and then clicks the stamp button 25 to input the stamp command (step S102). . Then, the control device 13 activates the imprinting means 15 (step S103).
5 is a user information input screen (not shown) on the display device 12.
Is displayed (step S104). This user information input screen (not shown) is a screen for inputting the user name and password, which are the user information required when using the electronic seal stamp data managed on the server 1 side, and the sealer Operates the input device 11 to input his / her user information (user name and password) on the user information input screen (not shown) (step S105).
Then, the imprinting means 15 reads the user information input on the user information input screen (not shown), accesses the electronic seal stamp data storage means 9 of the server 1 via the network 3, and based on the read user information. The electronic seal stamp data of the stamper is searched (step S106).

When the electronic seal stamp data of the imprinter is retrieved, the imprinting means 15 extracts the seal imprint image data and electronic certificate information of the imprinter (document creator) from the retrieved electronic seal stamp data. Is read through the network 3 (step S107), and is composed of the read seal imprint image data and electronic certificate information, and the seal information including information such as the name of the seal imprinter, the color of the seal imprint image data, and the total number of imprints. A seal stamp object of the sealer is created (step S108). In addition, the step S1
The electronic certificate information read at the stage of 07 is the control device 13
Is temporarily stored in the memory of. Incidentally, the step S
When the stamper's electronic seal stamp data is not retrieved at step 106, the stamp imprint image data stamping process ends at this point.

Next, when the processing of step S108 is completed, the stamping means 15 adds the created seal stamp object to the electronic document to be stamped displayed on the display device 12 (step S109). Then, as shown in FIG. 9, the seal imprint image data included in the seal stamp object added to the electronic document is displayed at the designated seal position on the electronic document. Here, an example of the seal stamp object added to the electronic document is shown in FIG. In addition, when the seal stamp object is added to the electronic document in the step S109, the date and time when the seal stamp object is added to the electronic document is added to the electronic certificate information and the seal information that form the seal stamp object. . This date and time is date / time information obtained from the server 1 or the client terminal 2, and the date and time added to the stamp information indicates the stamp date and time when the seal stamp object was added to the electronic document (the seal image data was stamped). The date and time to be added to the electronic certificate information indicates the date and time when a digital signature is applied to the electronic document to which the seal stamp object is added by the electronic signature processing described later. Although the electronic signature is not applied to the electronic document to which the seal stamp object is added at the time when the signature date and time is added to the electronic certificate information, the electronic signature described later after the seal stamp object is added to the electronic document. Since the error in the time until the process is executed is within the allowable range in which the date and time when the seal stamp object is added can be regarded as the signature date and time, the date and time when the seal stamp object is added is the signature date and time in this embodiment. Should be considered. Further, when the seal stamp object is added to the electronic document, the electronic certificate information and the seal stamp information forming the seal stamp object cannot be edited, so that this portion is not tampered with by a third party.

Next, when the processing of the step 109 is completed, the control device 13 activates the electronic signature means 16 (step S110), and the electronic signature means 16 causes the electronic certificate storage means 10 of the server 1 via the network 3. To access and display a selection screen (not shown) of the electronic certificate stored therein on the display device (step S111). This electronic certificate selection screen (not shown) is a screen for selecting an electronic certificate required to give an electronic signature to the electronic document to be imprinted displayed on the display device 12, and is an electronic certificate storage means. Of the information recorded in the digital certificate stored in 10, the private key / public key owner name (digital certificate owner name), digital certificate issuer name, and digital certificate expiration date , It is displayed in a list format for all users of this system.

When the imprinter selects his or her own electronic certificate from the list of electronic certificates displayed on the electronic certificate selection screen (not shown) (step S112), the electronic signature means 16 is selected. From the electronic certificate storage means 10 via the network 3 (step S113), and from the read electronic certificate, electronic certificate information (owner name of private key / public key (own electronic certificate) (Person name), Digital certificate issuer name, Digital certificate expiration date)
Is extracted (step S114), and the extracted electronic certificate information and the electronic certificate information temporarily stored in the memory read in the step S107 (private key / public key owner name (electronic (Certificate owner name), electronic certificate issuer name, and electronic certificate expiration date) are compared (step S115). Here, the digital certificate information temporarily stored in the memory read in the step S107 is included in the seal stamp object added to the electronic document in the step S109 ( Since it is the same as the private key / public key owner name (digital certificate owner name), digital certificate issuer name, and digital certificate expiration date), the comparison of the digital certificate information in step S115 is as follows. That is, the electronic certificate information extracted in the step S114 is compared with the electronic certificate information included in the seal stamp object added to the electronic document in the step S109.

As a result of the processing in step S115, the electronic certificate information extracted in step S114 matches the electronic certificate information included in the seal stamp object added to the electronic document in step S109. In this case (Yes in step S115), the electronic signature means 16 uses the electronic certificate read in the step S113 to electronically sign the electronic document added with the seal stamp object displayed on the display device 12. Is performed (step S116). Here, the electronic signature processing executed by the electronic signature means 16 is "Microsoft Wo
rd "(product name of Microsoft Corporation) and" Microso
doc in word processing and spreadsheet applications such as "ft Excel" (product name of Microsoft Corporation)
An electronic signature is generated from a file that is a storage format of an electronic document such as a file or an xls file, and this electronic signature is added to the electronic document. The electronic signature means 16
Can also be realized by the electronic signature function of an application such as a word processor or spreadsheet provided in the client terminal 2.

As described above, when the processes up to step S116 are completed, the imprinting process of the seal image data in the client terminal 2 is completed. After this,
The stamper saves the stamped electronic document with the digital signature added with the seal stamp object, and sends the stamped electronic document to a specific destination via the network 3 using e-mail or the like. Then, the viewer is allowed to browse using the client terminal 2 existing on the network 3.

Then, the viewer uses the other client terminal 2 existing on the network to display the stamped electronic document shown in FIG. This time,
By clicking the seal imprint image data displayed on the stamped electronic document, the electronic certificate information and the stamp information included in the seal stamp object shown in FIG. 10 added to this stamped electronic document are displayed on the display device. Since it is displayed in 12, the viewer can confirm that the electronic certificate information is applied to the affixed electronic document by the affixed person indicated by the imprint image data. The validity of the electronic signature can also be confirmed from the information such as the issuer of the electronic certificate used for the electronic signature, the date and time of signature of the electronic certificate, and the expiration date. Furthermore, by confirming the stamp information, the owner (imprinter) of the seal image data and the stamp date and time can also be confirmed.

On the other hand, as a result of the processing in step S115, the electronic certificate information extracted in step S114 matches the electronic certificate information included in the seal stamp object added to the electronic document in step S109. If not (No in step S115), the electronic signature means 16 does not apply the electronic signature to the stamped electronic document displayed on the display device 12, and thus the electronic signature is not applied. Then, the control device 13 activates the seal stamp deleting means 17 (step S117), and the seal stamp deleting means 17 displays the seal stamp object added to the electronic document displayed on the display device 12 which is not given the digital signature. It is deleted (step S118). As a result, the seal imprint image data displayed on the electronic document is deleted,
The seal process in the client terminal 2 ends.

Therefore, in the system according to the present embodiment, the process of adding the seal stamp object and the process of the electronic signature are linked, and the process of imprinting the seal image data includes the process of the electronic signature. If the electronic signature is not applied, the seal stamp object is not added and the seal imprinting process of the seal image data cannot be completed. Then, when the imprint process at the client terminal 2 is completed, the imprint image data being displayed on the electronic document means that the electronic document has an electronic signature. In the system according to the present embodiment, the visual representation of the electronic signature can be made by the seal image data. Therefore, the viewer of the stamped electronic document can confirm the presence or absence of the electronic signature by the seal image data.

Next, regarding the processing when the contents of the stamped electronic document on which the stamping process is performed are changed and the electronic document is stored, that is, the process when the stamped electronic document is tampered with This will be described based on the flowchart shown in FIG. The input device 11 of the client terminal 2 is operated to display the stamped electronic document shown in FIG. 9 on the display device 12 (step S201), the contents of the stamped electronic document are changed, and the stamped electronic document is saved. When a command to perform is input (step S202), the control device 13 confirms whether or not there is a changed portion in the content of the stamped electronic document (step S203). When there is a changed portion (Yes in step S203), the control device 13 first activates the electronic signature deleting means 18 to delete the electronic signature given to the stamped electronic document (step S204). The electronic signature deleting means 18 can also be realized by the electronic signature function of an application such as a word processor or spreadsheet provided in the client terminal 2.

When the process of step 204 is completed, the control device 13 activates the seal stamp deleting means 17 to delete the seal stamp object added to the stamped electronic document and delete the seal imprint image displayed on the electronic document. The data is deleted (step S205), and the electronic document in which this seal stamp object is deleted is saved (step S206). If there is no changed portion in the content of the stamped electronic document at the step S203 (N at step S203).
o), the stamp object is not deleted from the stamped electronic document.

As described above, when the contents of the stamped electronic document subjected to the stamping process are changed and stored, the electronic signature attached to the stamped electronic document and the seal stamp object added to the electronic document are changed. Therefore, for example, even if a third party other than the legitimate stamper who performed the stamping process on the stamped electronic document changes the contents of the stamped electronic document, the seal stamp added to the stamped electronic document is deleted. Since the object is deleted and the seal imprint image data on the electronic document is also deleted, the stamped electronic document will not be circulated while the contents have been tampered with by a third party. As a result, it is possible to prevent the third party from tampering with the stamped electronic document.

The above is one embodiment of the present invention, and in the above-described embodiment, the electronic seal stamp data of each user is managed as the server 1 side, but each user has his or her own electronic seal stamp data. The seal stamp data is FD or CD-ROM
Alternatively, the information may be stored in the memory and managed by each person. In the case of imprinting the seal image data on the electronic document in such a management mode, the imprinter sets the FD or the CD-ROM storing the electronic seal stamp data in the FD drive or the CD-ROM drive of the client terminal 2 and then inputs the input device. By operating 11 to input the imprinting command, the imprinting process of the imprint image data can be performed as in the above-described embodiment.

Further, in the above-described embodiment, the example in which the electronic seal stamp system of the present invention is applied to the corporate network is shown. However, the electronic seal stamp system of the present invention can be applied to a network between companies. Needless to say.

[0039]

As described above, in the electronic seal stamp system of the present invention, the process of adding a seal stamp object and the process of electronic signature are interlocked, and the process of imprinting the seal image data includes the process of electronic signature. Since the imprinting process of the seal imprint image data cannot be completed without a signature, the visual representation of the digital signature is made possible by the seal imprint image data, and the presence or absence of the digital signature should be confirmed by the seal imprint image data. You can

Further, since it is possible to confirm the electronic certificate information contained in the seal stamp object added to the stamped electronic document which has been stamped by the electronic seal stamp system of the present invention, the electronic certificate information can be used. It is also possible to confirm the validity of the electronic signature given to the stamped electronic document.

Furthermore, when the contents of the stamped electronic document subjected to the stamping process by the electronic seal stamp system of the present invention are changed and saved, the contents are added to the stamped electronic document together with the electronic signature given to the stamped electronic document. Since the seal stamp object is deleted and the seal image data displayed on the electronic document is also deleted, the stamped electronic document is not stored or circulated in a tampered state by a third party. It is possible to prevent the tampering of the stamped electronic document by the three parties.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an entire system according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a server according to an embodiment of the present invention.

FIG. 3 is a configuration diagram of a client terminal according to an embodiment of the present invention.

FIG. 4 is a flowchart showing a procedure of electronic seal stamp data creation processing according to the embodiment of the present invention.

FIG. 5 is a diagram showing an electronic seal stamp data creation screen according to an embodiment of the present invention.

FIG. 6 is a diagram showing electronic seal stamp data according to an embodiment of the present invention.

FIG. 7 is a flowchart showing a procedure of a stamping process according to the embodiment of the present invention.

FIG. 8 is a diagram showing an example of an electronic document to be imprinted according to an embodiment of the present invention.

FIG. 9 is a diagram showing an example of a stamped electronic document according to an embodiment of the present invention.

FIG. 10 is a diagram showing a seal stamp object according to an embodiment of the present invention.

FIG. 11 is a flowchart showing a procedure of processing when a stamped electronic document according to an embodiment of the present invention is falsified.

[Explanation of symbols]

1 server 2 Client terminal 3 network 4 input device 5 Display device 6 control device 7 storage device 8 Electronic seal stamp data creation means 9 Electronic seal stamp data storage means 10 Electronic certificate storage means 11 Input device 12 Display 13 Control device 14 Storage device 15 Imprinting means 16 Electronic signature means 17 Seal deletion means 18 Electronic signature deletion means

Claims (4)

[Claims] 1. An electronic seal stamp data storage unit for storing electronic seal stamp data obtained by adding electronic certificate information extracted from an electronic certificate to seal imprint image data, and a sealer retrieved from the electronic seal stamp data storage unit. Of the seal imprint image data and electronic certificate information from the electronic seal stamp data, and adds the seal imprint image data and electronic certificate information to the electronic document as a seal stamp object, and an electronic stamp extracted from the sealer's electronic certificate. When the certificate information and the electronic certificate information included in the seal stamp object added to the electronic document match, an electronic signature is applied to the electronic document to which the seal stamp object is added using the sealer's electronic certificate. Electronic signature means for applying, electronic certificate information extracted from the sealer's electronic certificate, and a seal stamp object added to the electronic document A seal stamp deleting unit that deletes the seal stamp object added to the electronic document when the electronic signature is not given to the electronic document to which the seal stamp object is added and does not match the electronic certificate information being provided, An electronic seal stamp system characterized in that it is equipped. 2. When the contents of the stamped electronic document are changed,
2. The electronic seal stamp system according to claim 1, wherein the seal stamp deleting unit deletes the seal stamp object added to the stamped electronic document whose content has been changed. 3. An electronic seal stamp data creating process of adding electronic certificate information extracted from an electronic certificate to seal imprint image data to create and store electronic seal stamp data, and a storage means storing the electronic seal stamp data. Sealing process for extracting seal imprint image data and digital certificate information from the retrieved electronic seal stamp data of the stamper and adding the seal stamp image data and digital certificate information to the electronic document as a seal stamp object, and the sealer's digital certificate The electronic certificate of the sealer for the electronic document to which the seal stamp object is added when the electronic certificate information extracted from the electronic certificate information included in the seal stamp object added to the electronic document matches A digital signature process for applying a digital signature using a digital signature, electronic certificate information extracted from a sealer's digital certificate, and a seal stamp object added to the electronic document Stamp deletion processing for deleting the seal stamp object added to the electronic document when the electronic signature is not given to the electronic document to which the seal stamp object is added and the electronic certificate information included in the document does not match. A recording medium in which an electronic seal stamp program for causing a computer to execute is recorded. 4. When the contents of the stamped electronic document are changed,
The recording medium according to claim 3, wherein an electronic seal stamp program for causing a computer to execute a process of deleting a seal stamp object added to a stamped electronic document whose content has been changed is recorded.