KR20100053158A - System and method for certificating originality of electronic document - Google Patents

Abstract

PURPOSE: A system and a method for certificating originality of electronic document are provided to easily request an issue of time stamp about each electronic document without changing a large amount of electronic documents to a specific document format. CONSTITUTION: An electronic document generator computer(10) generates electronic documents and request certificating original document about the electronic document. If the request is receives form a electronic generator computer, a homepage server(20) checks identity of electronic document generator. If the request is received form the homepage server, a front server(30) request a time stamp token. If the time stamp token is received, a time stamp server(40) generates a time stamp token about the electronic document. The electronic document generator computer receives the time stamp token, and inserts the time stamp token to the electronic document.

Description

SYSTEM AND METHOD FOR ORIGINALITY OF ELECTRONIC DOCUMENT}

The present invention relates to a system and a method for authenticating an original document of an electronic document. Specifically, a time stamp indicating an original proof is imprinted on an electronic document that has received the original proof and can be visually confirmed. The present invention relates to a system and method for authenticating an electronic document capable of receiving original proof.

In many cases, government offices such as government offices, ward offices, and city halls issue civil complaints as electronic documents instead of existing paper documents. In the private sector, as electronic commerce increases, payments are made online, thereby increasing the exchange of electronic documents. Compared to conventional paper documents, electronic documents are convenient to issue and very useful in electronic commerce, but it is difficult to prove that the electronic documents are original because they are not only easy to duplicate or forgery, but also difficult to identify whether they are duplicated or forged.

In order to prove the original of the electronic document, a time stamp is issued to check the timing when the electronic document is generated. When the electronic document creator requests a time stamp from the certification authority, the certification authority issues a time stamp and transmits the time stamp to the electronic document generator's system. The creator of the electronic document can keep the time stamp issued to confirm the time of creation of the electronic document, and can prove the originality of the electronic document based on the time stamp in case of dispute.

However, the time stamp issued for checking the timing of the electronic document is managed separately from the electronic document, and thus there is a problem in that the time stamp cannot be visually confirmed when the electronic document is read.

In addition, most electronic documents are converted to a specific document format (for example, a PDF file) to obtain a time stamp for each electronic document. If a large amount of electronic documents to be issued a time stamp is specified, all electronic documents are specified. There is a problem that it is cumbersome and inconvenient when requesting time stamp issuance because it needs to be converted to document format.

The present invention was devised to solve the above problems, and an object of the present invention is to provide an original document authentication system and method for visually confirming a time stamp when an electronic document is read.

In addition, an object of the present invention is to provide a system and method for authenticating the original of an electronic document, which enables a user to request issuance of a time stamp for each electronic document without converting a large number of electronic documents into a specific document format.

To this end, the electronic document original proofing system according to the present invention generates an electronic document and generates an electronic document and generates an original document request for the electronic document. A home page server for checking, a front server for requesting a timestamp token upon receipt of an original proof request from the home page server, and a timestamp server for generating a timestamp token for an electronic document upon receipt of a timestamp token request from the front server; And the electronic document generator computer receives the timestamp token from the timestamp server and inserts the timestamp token into the electronic document.

In addition, the electronic document original proof system according to the present invention generates an electronic document, the electronic document generator computer for generating the original document and the document conversion request for the electronic document, and receives the original proof and document conversion request from the electronic document generator computer A homepage server for verifying the identity of a document creator, a document conversion server for converting the electronic document into a specific document format and requesting a timestamp token upon receiving an original proof and document conversion request from the homepage server, and from the document conversion server. And a timestamp server for generating a timestamp token request for the electronic document upon receiving a timestamp token request from the front server, wherein the document conversion server includes a timestamp from the timestamp server. Receive and get stamp tokens By inserting a stamp token to the electronic document converted into a particular document format it is characterized in that the electronic document sent to the machine constructor.

In addition, the electronic document original proof method according to the present invention comprises the steps of generating an electronic document by the electronic document generator computer and generates a hash value for the electronic document, the electronic document generator computer, the original proof request message containing the hash value Transmitting the original proof request message to the front server, the front server verifying the original proof request message to the front server, and verifying the original proof request message and sending the timestamp token request message to the home server. Transmitting the timestamp token to the timestamp server, the timestamp server combining time information with the hash value, and generating and inserting the timestamp token into the electronic document. Characterized in that it comprises a step.

In addition, the electronic document original proofing method according to the present invention comprises the steps of generating an electronic document by the electronic document generator computer and generates a hash value for the electronic document, the electronic document generator computer, the original proof / document containing the hash value Transmitting the generated electronic document along with a conversion request message to a home page server, verifying the identity of the creator of the electronic document by the home page server, and transmitting an original proof / document conversion request message to a document conversion server; A conversion server converting the electronic document into a specific document format and sending a timestamp token request message to a front server, the front server validating the timestamp token request message and passing it to a timestamp server; The timestamp server combines the time information and the hash value to generate a timestamp token. And generating, by the document conversion server, the timestamp token, and inserting the timestamp token into the electronic document converted into the specific document format to deliver the timestamp token to the electronic document creator computer. do.

When the timestamp token is inserted into the electronic document, the timestamp is imprinted on the electronic document and visually displayed. When the electronic document is the original as a result of forgery verification of the electronic document, a mark indicating that the electronic document is the original is added to the time stamp. If it is not the original, a mark indicating that it is not an original is displayed on the time stamp.

As described above, the present invention has the effect of being able to visually immediately confirm that the electronic document received the original proof when viewing the electronic document because the time stamp is stamped on the original document received the original proof.

In addition, when the final verification of the forgery of the electronic document that received the original proof is displayed as a mark attached to the time stamp, the forgery of the electronic document can be confirmed simply and intuitively.

In addition, since the present invention can request a document conversion with the original document request for the electronic document, there is an effect that the original document can be simply and conveniently received when a large number of electronic documents are intended to receive the original document in a specific document format.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of an electronic document original proof system according to the first embodiment.

In the electronic document original proofing system of the first embodiment, the electronic document creator computer 10 converts the electronic document to receive the original proof into a specific document format, and then requests and issues a time stamp for the converted electronic document. Inserting a time stamp into an electronic document is performed by itself.

As shown in FIG. 1, the electronic document generator computer 10 generates an electronic document and logs in to the homepage server 20 to request a time stamp for the electronic document. When the homepage server 20 receives a request for issuing a time stamp, the home page server 20 confirms the identity of the creator of the electronic document and transmits the request for issuing the time stamp of the electronic document generator to the front server 30.

When the front server 30 receives a time stamp issuing request from the homepage server 20, the front server 30 transmits the request to the time stamp server 40. When the timestamp server 40 receives the timestamp issue request from the front server 30, the timestamp server 40 generates a timestamp using the time information provided from the timeserver 50. The time server 50 receives the standard time from the Global Positioning System (GPS) satellite and provides time information to the time stamp server 40.

The time stamp generated by the time stamp server 40 is transmitted to the electronic document creator computer 10 via the front server 30 and the home page server 20. The electronic document generator computer 10 inserts the issued time stamp into the electronic document to generate an electronic document stamped with the time stamp.

2 shows a configuration diagram of an electronic document original proof system according to a second embodiment.

In the electronic document original proofing system of the second embodiment, when the electronic document creator computer 10 requests the issuance of a time stamp without converting the electronic document to receive the original proof into a specific document format, the document conversion is also requested. You will be provided with an embedded electronic document.

As shown in FIG. 2, the electronic document generator computer 10 generates an electronic document and logs in to the homepage server 20 to request a time stamp for the electronic document and to convert the document. When the homepage server 20 receives a request for issuing a time stamp and converting a document, the homepage server 20 confirms the identity of the creator of the electronic document and transmits the request for issuing a time stamp and converting the document to the document conversion server 60. When the document conversion server 60 receives a time stamp issuance and document conversion request from the homepage server 20, the document conversion server converts the electronic document into a specific document format and transmits the time stamp issuance request to the front server 40.

When the front server 40 receives the time stamp issuance request from the document conversion server 60, the front server 40 transmits it to the time stamp server 40. When the timestamp server 40 receives the timestamp issue request from the front server 30, the timestamp server 40 generates a timestamp using the time information provided from the timeserver 50.

The time stamp generated by the time stamp server 40 is transmitted to the document conversion server 60 via the front server 30. The document conversion server 60 inserts the issued time stamp into the electronic document converted into a specific document format to generate an electronic document stamped with the time stamp. The electronic document stamped with the time stamp is transmitted to the electronic document creator computer 10 via the homepage server 20.

3 and 4 show the signal flow in the electronic document original proof system according to the first and second embodiments, respectively.

In FIG. 3 and FIG. 4, a time stamp and a time stamp token are distinguished. That is, the timestamp token is an object actually inserted into the electronic document, and the timestamp means a mark imprinted on the electronic document by the insertion of the timestamp token. Thus, a timestamp token is a file sent and received between components of the system, and a timestamp is a pattern displayed in an electronic document.

The signal flow in the electronic document original proof system of the first embodiment shown in FIG. 3 will be described.

First, the electronic document generator generates an electronic document in the electronic document generator computer 10 (S1). The electronic document creator requests the original proof by accessing the homepage server 20 for the original proof of the electronic document. When converting an electronic document to a specific document format before requesting the original proof, for example, the original proof can be requested after converting it to a PDF file. When requesting the original proof, a hash value is generated as unique information of the electronic document (S2). The hash value is extracted based on the size and content of the electronic document using a hash value extraction algorithm (eg, SHA 128).

Subsequently, an original proof request message including a hash value is generated and transmitted to the homepage server 20 (S3). The original proof request message is digitally signed with the private key of the PKI certificate and transmitted to the homepage server 20, and the homepage server 20 decrypts the original proof request message to verify the identity of the creator of the electronic document ( S4). When the identity of the electronic document creator is confirmed, the original proof request message is transmitted to the front server 30 (S5).

After verifying the original proof request message (S6), the front server 30 transmits the timestamp token request message including the hash value to the timestamp server 40 (S7). After verifying the timestamp token request message (S8), the timestamp server 40 receives time information from the time server 50 (S9) and generates a timestamp token by combining the time information and the hash value (S10). ). The generated timestamp token is digitally signed with the secret key of the TSA (Time Stamp Authoriy) certificate. After the timestamp token is generated, the timestamp server 40 generates a timestamp token response message and transmits the timestamp token response message including the timestamp token to the front server 30 (S11).

The front server 30 verifies the timestamp token response message (S12), extracts the timestamp token from the timestamp token response message, stores it in a database (S13), and transmits the timestamp token to the homepage server 20. (S14). The front server 30 manages time stamp token issuing information by storing the time stamp token in a database. The home page server 20 transmits the received timestamp token to the electronic document generator computer 10 (S15). The electronic document generator computer 10 inserts a timestamp token into the electronic document to perform original proof for the electronic document (S16).

Next, the signal flow in the electronic document original proof system of the second embodiment shown in FIG. 4 will be described.

First, the electronic document generator generates an electronic document in the electronic document generator computer 10 (S30). The electronic document creator requests the original document and document conversion by accessing the home page server 20 for document proof and document conversion of the electronic document. When requesting original proof and document conversion, first, a hash value is generated as unique information of the electronic document (S31). Subsequently, an original proof / document conversion request message including a hash value is generated, and the original proof / document conversion request message is transmitted to the homepage server 20 together with the previously generated electronic document (S32).

The original proof / document conversion request message is electronically signed with the private key of the PKI certificate and transmitted to the homepage server 20. The homepage server 20 decrypts the original proof / document conversion request message to generate the electronic document. Check the identity of (S33). If the identity of the electronic document creator is confirmed, the original proof / document conversion request message and the electronic document is transmitted to the document conversion server 60 (S34). The document conversion server 60 verifies the original proof / document conversion request message (S35), and converts the electronic document into a specific document format (S36). The particular document format here can be a PDF file.

After document conversion, a timestamp token request message including a hash value is transmitted to the front server 30 (S37). The front server 30 verifies the timestamp token request message (S38) and then transfers the timestamp token request message to the timestamp server 40 (S40). After verifying the timestamp token request message (S40), the timestamp server 40 receives time information from the time server 50 (S41) and generates a timestamp token by combining the time information and the hash value (S42). ). The generated timestamp token is digitally signed with the secret key of the TSA (Time Stamp Authoriy) certificate. After the timestamp token is generated, the timestamp server 40 generates a timestamp token response message and transmits a timestamp token response message including the timestamp token to the front server 30 (S43).

The front server 30 verifies the timestamp token response message (S44), extracts the timestamp token from the timestamp token response message, stores it in a database (S45), and transmits the timestamp token to the document conversion server 60. (S46). The document conversion server 60 inserts the received timestamp token into the previously converted electronic document (S47). The electronic document containing the timestamp token is transmitted to the homepage server 20 (S48), and the homepage server 20 transmits the electronic document containing the timestamp token to the electronic document generator computer 10 (S49).

In the first and second embodiments, it is assumed that the electronic document creator creates TEST.HWP as an electronic document and proves the original as a PDF file. In this case, the timestamp token generated by combining the hash value of the electronic document with the time information of the time server 50 becomes TEST.TST. TEST.TST is inserted into TEST.PDF by the electronic document generator computer 10 or the document conversion server 60, and a file called TEST_CERTI.PDF is generated, for example. When you open this TEST_CERTI.PDF file, the time stamp will be stamped on the document, indicating that the electronic document has received the original proof.

5 shows a time stamp imprinted on an electronic document.

The shape of the time stamp may be configured in a circular shape, which is a general paint shape as illustrated in FIG. 5A, or may be configured in a quadrangle as illustrated in FIG. The time stamp shows a pattern representing the time stamp and the time of creation of the electronic document.

If there is a dispute about the origin of the electronic document or the originality, the time stamps imprinted on the electronic document may temporarily prove the originality of the electronic document, but it does not finally confirm the originality of the electronic document. Therefore, it is necessary to determine whether the forgery is final for the electronic document in which the time stamp is imprinted.

To do this, first, the timestamp token inserted into the electronic document to be verified is decrypted with the public key of the TSA certificate and a hash value is extracted therefrom. After extracting the hash value (first hash value) of the timestamp token, the hash value (second hash value) is extracted again using the algorithm used to extract the hash value of the first electronic document. By comparing the first hash value with the second hash value, the originality may be finally asserted. Otherwise, the forgery of the electronic document may be claimed.

6 illustrates the shape of a time stamp according to a verification result of an electronic document.

First, Figs. 6A and 6B show timestamps when the original original proof is confirmed. The 'exclamation mark' mark (!) Indicates the status of issuing a timestamp token for the electronic document but not verifying the forgery, and is the same as when there is no mark on the timestamp.

6 (a2) and (b2) show timestamps when the original proof is finally confirmed. The 'check' mark is a time stamp token issued to an electronic document and indicates that there is no abnormality as a result of forgery verification.

(A3) and (b3) of FIG. 6 show timestamps in the case where it is proven that they are not original. The 'X' mark indicates a state where a time stamp token is issued for an electronic document and an abnormality occurs as a result of forgery verification.

7 shows a user interface of the time stamp issuing software.

The time stamp issuing software is installed in the electronic document generator computer 10, and the electronic document generator performs original proof work on the electronic document using the time stamp issuing software.

The electronic document is displayed on the left side of the user interface screen, and the contents of the electronic document are displayed on the right side. When the electronic document generator selects an electronic document for which a time stamp is to be issued from the left side and executes a 'timestamp issuance operation' from the 'timestamp management' menu, a timestamp issuing operation for the selected document is performed.

That is, as described above, the timestamp token generated by the timestamp server 40 is transmitted to the electronic document generator computer 10, and the electronic document generator computer 10 timestamps the electronic document using the timestamp issuing software. Insert token. The creator of the electronic document can view the electronic document stamped with the time stamp on the right screen.

In addition, when the electronic document is to be verified, selecting the left electronic document to be verified and executing the 'timestamp verification operation' from the 'timestamp management' menu, the verification operation on the selected document is performed.

That is, as described above, the electronic document generator computer 10 compares the hash value of the timestamp token with the hash value of the electronic document using the timestamp issuing software. If the hash values are the same, the electronic document is stamped with a time stamp appended with a 'check' mark as shown in (a2) of FIG. 6, and in another case, a time stamp with an 'x' mark is added as shown in FIG. 6 (a3). It is engraved.

When the verification of the electronic document is completed, a pop-up window pops up on the user interface screen to immediately check whether the electronic document is forged or not. In addition, since the time stamp according to the verification result is imprinted on the electronic document in which the forgery verification of the document is completed, the time stamp can be confirmed whether the document is forged or not.

Those skilled in the art can improve or change the technical idea of the present invention in various forms. Therefore, it should be understood that the embodiments of the present invention described with reference to the drawings should not be construed as limiting the technical spirit of the present invention, and the protection scope of the present invention is limited only by the matters described in the claims.

1 is a block diagram of an electronic document original proof system according to the first embodiment.

2 is a block diagram of an electronic document original proof system according to a second embodiment.

3 is a signal flowchart of an electronic document original proof system according to the first embodiment;

4 is a signal flowchart of an electronic document original proof system according to a second embodiment;

5 is a time stamp stamped on an electronic document.

6 is a view showing the shape of a time stamp according to the verification result of the electronic document.

7 illustrates a user interface of the time stamp issuing software.

<Description of the symbols for the main parts of the drawings>

10: electronic document generator computer 20: homepage server

30: Front Server 40: Timestamp Server

50: Time Server 60: Document Conversion Server

Claims (14)

An electronic document creator computer for generating electronic documents and requesting original proof of electronic documents; A homepage server for verifying the identity of the electronic document creator upon receiving an original proof request from the electronic document creator computer; A front server for making a timestamp token request upon receiving an original proof request from the homepage server; Receiving a time stamp token request from the front server, including a time stamp server for generating a time stamp token for the electronic document, The electronic document generator computer receives a timestamp token from the timestamp server and inserts a timestamp token into the electronic document. An electronic document creator computer for generating electronic documents and making original document proof and document conversion requests; A home page server for verifying the identity of the electronic document creator upon receiving the request for proof of original and document conversion from the electronic document creator computer; A document conversion server converting the electronic document into a specific document format and requesting a timestamp token upon receiving the original proof and document conversion request from the homepage server;  A front server for delivering a timestamp token request from the document conversion server; Receiving a time stamp token request from the front server, including a time stamp server for generating a time stamp token for the electronic document, The document conversion server receives a timestamp token from the timestamp server, inserts the timestamp token into the electronic document converted into the specific document format, and transmits the original document to the electronic document creator computer. . The method according to claim 1 or 2, When the timestamp token is inserted into the electronic document, the original document authentication system of the electronic document, characterized in that the time stamp is imprinted on the electronic document. The method of claim 3, And a forgery verification result for the electronic document, wherein the original document is a mark indicating that the original is in the timestamp when the electronic document is an original. The method of claim 3, And a mark indicating that the electronic document is not the original is added to the timestamp when the electronic document is not the original, as a result of the forgery verification of the electronic document. The method according to claim 1 or 2, And the front server stores timestamp tokens received from the timestamp server in a database to manage timestamp token issuing information. The method of claim 2, And the electronic document creator computer transmits the generated electronic document to the homepage server together with the original proof and document conversion request. The method of claim 2, And the specific document format is PDF. An electronic document creator computer generates an electronic document and generates a hash value for the electronic document; Transmitting, by the electronic document creator computer, an original proof request message including the hash value to a homepage server; Verifying, by the homepage server, the identity of the creator of the electronic document and forwarding an original proof request message to the front server; Verifying, by the front server, an original attestation request message and sending a timestamp token request message to a timestamp server; Generating, by the time stamp server, a time stamp token by combining time information and the hash value; And receiving, by the electronic document creator computer, the timestamp token and inserting the electronic document into an electronic document. An electronic document creator computer generates an electronic document and generates a hash value for the electronic document; Transmitting, by the electronic document creator computer, the generated electronic document to a homepage server together with an original proof / document conversion request message including the hash value; Verifying, by the homepage server, the identity of the creator of the electronic document and transmitting an original proof / document conversion request message to the document conversion server; The document conversion server converting the electronic document into a specific document format and transmitting a timestamp token request message to a front server; Verifying, by the front server, a timestamp token request message and passing it to a timestamp server; Generating, by the time stamp server, a time stamp token by combining time information and the hash value; Receiving, by the document conversion server, the timestamp token and inserting the timestamp token into the electronic document converted into the specific document format and transmitting the timestamp token to the electronic document creator computer. . The method according to claim 9 and 10, And when the timestamp token is inserted into the electronic document, a time stamp is imprinted on the electronic document and visually displayed. The method of claim 11, Further including the forgery verification step for the electronic document, The verifying step may include extracting a hash value from the timestamp token; Extracting a hash value from the electronic document; Checking whether the two hash values are the same, and if the two hash values are the same, a mark indicating an original is added to the timestamp; Characteristic proof method of electronic document characterized by. The method according to claim 9 and 10, And receiving, by the front server, a timestamp token from the timestamp server and storing the timestamp token in a database. The method of claim 10, The original document authentication method of the electronic document, characterized in that the specific document format is PDF.

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