JP2006174055A - Information presence proving processor, information utilizing terminal equipment, information presence proving system, information presence proving method, program and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely prove that information that a certain information user has browsed through a network is the information provided by a certain information provider. <P>SOLUTION: At the time of receiving an information acquisition request (a URL) from information utilizing terminal equipment 100, an information presence proving processor 200 acquires the information corresponding to the URL, returns it to the information utilizing terminal equipment 100, and temporarily keeps all the access information (the browsing time, the URL and contents) itself at the time. Also, at the time of receiving a present information registration request (the browsing time and the URL) from the information utilizing terminal equipment 100, it generates a hash value from the access information, strings it to the browsing time and the URL and registers it. Further, at the time of receiving the present information registration request (the hash value, the browsing time to be the origin of the hash value and the URL) from the information utilizing terminal equipment 100, it compares the received hash value with the registered corresponding hash value and verifies whether or not the corresponding contents were present at the corresponding browsing time and URL. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an information presence certification processing device, an information utilization terminal device, and an information presence certification system that perform proof (information existence certification) that information browsed by a certain information user is information provided by an information provider. Further, the present invention relates to an information existence proof method, a program, and a recording medium.

  By using Internet technology, it is possible to easily browse information published on the network. However, the information viewed may be altered or deleted by the information provider, and it is not possible to prove whether the information viewed by the information user is provided by the information provider. There was a problem that legal troubles such as sales contracts occurred.

  As means for solving this problem, Patent Document 1 (Japanese Patent Laid-Open No. 11-175512) proposes a document existence proof system.

The document existence certification system described in Patent Document 1 transmits the URL of a document acquired from a document server by an information user to the document existence certification server, and the document existence certification server starts from the document server indicated by the acquired document URL. For example, a copy of the document is obtained, the copy of the document is stored in the document server, and it is proved that the document exists.
JP-A-11-175512

  However, since the document existence proof system described in Patent Document 1 is configured to acquire a copy of a document from the document server based on the URL of the document transmitted from the information user as described above, There is a time lag between the timing when the user acquires the document from the document server and the timing when the document existence certification server acquires the document from the document server.

  Therefore, there is a possibility that the document server will rewrite the document during this time lag, and the document existence certification server may not be able to obtain the document subject to existence certification of the document obtained by the information user from the same URL. Resulting in.

  Therefore, the system described in Patent Document 1 has a problem that it cannot be proved that the document to be proved actually exists in the document server.

  The present invention has been made to solve the above problems, and an object of the present invention is to store contents from an information use terminal device capable of communicating via a predetermined communication medium in an information existence certification processing device. Storage location information indicating the content, acquiring content based on the received storage location information, acquiring the acquired content, acquisition date information indicating the acquisition date of the content, and storage location information indicating the storage location of the content A relay process for transmitting the acquired content and acquisition date / time information indicating the acquisition date / time of the content to the information using terminal device, and acquiring the content from the information using terminal device. Received acquisition date / time information indicating the date / time and storage location information indicating the storage location of the content, and received the acquired date / time information and storage The content is read from the first storage means using the location information as a key, and the weak collision prevention property is obtained from the read content, the acquisition date information indicating the acquisition date of the content, and the storage location information indicating the storage location of the content. The first calculated value is calculated using the direction function, and the first calculated value, the acquisition date information and the storage location information used for calculating the first calculated value are linked and stored in the second storage unit. Presence information registration processing, a second calculated value calculated from the information using terminal device using the one-way function of weak collision prevention, storage location information used for calculating the second calculated value, and Receiving acquisition date information, reading the first calculation value from the second storage means based on the received second calculation value, storage location information, and acquisition date information, and reading the first calculation And the received second calculated value are compared, and the content used for calculating the second calculated value is received together with the second calculated value at the date and time indicated by the acquisition date and time information. It is determined whether or not the storage location indicated by the storage location information received together with the calculated value exists, and a presence information verification process is performed to transmit the determination result to the information usage terminal device. The storage location information indicating the storage location of the content is transmitted to the information presence certificate processing device, and the content acquired from the storage location information and the acquisition date information indicating the acquisition date and time of the content in the information presence certificate processing device The acquisition request processing received from the certification processing device, the acquired acquisition date / time information and the storage location information corresponding to the acquisition date / time information are transmitted to the information existence certification processing device, Registration request processing to be registered in the information presence certification processing device, content registered in the information presence certification processing device, acquisition date information of the content, and storage location information of the content from the information presence certification processing device to prevent weak collision Calculating the second calculated value by using a one-way function of sex, and obtaining the second calculated value, the acquisition date / time information and the storage location information used for calculating the second calculated value, in the information existence certification processing device The storage location information transmitted together with the second calculated value indicates the date and time indicated by the acquisition date information transmitted from the content used for calculating the second calculated value together with the second calculated value. It is provided on the Internet, intranet, etc. by performing verification request processing for receiving the verification result of whether or not it exists at the storage location from the information presence certificate processing device. Even if the information is rewritten by the information provider immediately after the information is viewed by the information user, it is ensured that the information viewed by the information user is the information provided by a certain information provider. As a result, it is possible to improve the reliability of the information provided by the information provider and the social reliability of the information provider itself, and the information provider has a sales contract with the information user. Information existence certification processing apparatus, information utilization terminal apparatus, information existence certification system, information existence certification method, program, and recording medium capable of constructing an information existence certification system that can avoid legal troubles such as Is to provide.

  According to the present invention, in an information existence certification processing device, storage location information indicating a storage location of content is received from an information using terminal device capable of communicating via a predetermined communication medium, and content is stored based on the received storage location information. The acquired content, the acquisition date / time information indicating the acquisition date / time of the content, and the storage location information indicating the storage location of the content are associated with each other and stored in the first storage unit, and the acquired content and the content Receiving the acquisition date / time information indicating the acquisition date / time to the information using terminal device, receiving the acquisition date / time information indicating the content acquisition date / time and the storage location information indicating the storage location of the content from the information using terminal device The content is read from the first storage means using the received acquisition date information and storage location information as keys. The first calculated value is calculated from the read content, the acquisition date / time information indicating the acquisition date / time of the content, and the storage location information indicating the storage location of the content using a one-way function of weak collision prevention, A presence value registration process in which the calculated value of 1 and the acquisition date and time information and storage location information used to calculate the first calculated value are linked and stored in the second storage means; and the weak collision from the information using terminal device The second calculated value calculated using the one-way function of prevention, the storage location information and the acquisition date / time information used for calculating the second calculated value are received, and the received second calculated value and Based on the storage location information and the acquisition date and time information, the first calculated value is read from the second storage means, and the read first calculated value is compared with the received second calculated value, Of the second calculated value It is determined whether or not the content used for the retrieval exists at the storage location indicated by the storage location information received together with the second calculated value at the date and time indicated by the acquisition date and time information received together with the second calculated value. The presence information verification process for transmitting the determination result to the information use terminal device is performed, and the information use terminal device transmits storage location information indicating the storage location of the content to the information presence certification processing device, and the storage location The acquisition request processing for receiving the content acquired from the information and the acquisition date / time information indicating the acquisition date / time of the content in the information existence certification processing device from the information presence certification processing device, and the acquired acquisition date / time information and the acquisition date / time information A registration request process for transmitting corresponding storage location information to the information presence certificate processing apparatus and registering the information in the information presence certificate processing apparatus; and The second calculated value is calculated using the one-way function for preventing weak collision from the information existence certification processing device for the content registered in the certification processing device, the acquisition date information of the content, and the storage location information of the content. Then, the second calculated value and the acquisition date / time information and the storage location information used for calculating the second calculated value are transmitted to the information existence certification processing device, and used for calculating the second calculated value. The information present indicates a verification result as to whether or not the content exists in the storage location indicated by the storage location information transmitted together with the second calculated value at the date and time indicated by the acquisition date information transmitted together with the second calculated value. The configuration is characterized in that the verification request processing received from the certification processing device is performed.

  According to the present invention, in the information presence certification processing device, the storage location information indicating the storage location of the content is received from the information using terminal device that can communicate via a predetermined communication medium, and based on the received storage location information The content is acquired, the acquired content, the acquisition date / time information indicating the acquisition date / time of the content, and the storage location information indicating the storage location of the content are associated with each other and stored in the first storage unit. Relay processing for transmitting acquisition date information indicating the acquisition date of the content to the information using terminal device, acquisition date information indicating the acquisition date of content from the information using terminal device, and storage location information indicating the storage location of the content Receiving the content from the first storage means using the received acquisition date and time information and storage location information as keys. A first calculation value is calculated using a one-way function for preventing weak collision from the read content, the acquisition date information indicating the acquisition date of the content, and the storage location information indicating the storage location of the content; A presence information registration process for associating the first calculated value and the acquisition date and time information and the storage location information used for calculating the first calculated value and storing them in a second storage means; Receiving the second calculated value calculated using the one-way function of weak collision prevention and the storage location information and the acquisition date / time information used for calculating the second calculated value, the received second calculation Based on the value, storage location information, and acquisition date / time information, the first calculated value is read from the second storage means, and the read first calculated value is compared with the received second calculated value. The second calculation Whether or not the content used for calculating the value exists in the storage location indicated by the storage location information received together with the second calculated value at the date and time indicated by the acquisition date and time information received together with the second calculated value. Determining and performing presence information verification processing for transmitting the determination result to the information using terminal device, and transmitting information storing location information indicating a storage location of the content to the information presence certificate processing device in the information using terminal device, Acquisition request processing for receiving content acquired from storage location information and acquisition date / time information indicating the acquisition date / time of the content in the information presence certification processing device from the information presence certification processing device, and the acquired acquisition date / time information and acquisition date / time A registration request process for transmitting storage location information corresponding to information to the information presence certificate processing apparatus and causing the information presence certificate processing apparatus to register; Using the one-way function for preventing weak collision, the second calculated value is obtained from the information registered in the information existence certification processing device, the acquisition date information of the content, and the storage location information of the content from the information existence certification processing device. Calculating, transmitting the second calculated value and the acquisition date / time information and storage location information used for calculating the second calculated value to the information existence certification processing apparatus, and used for calculating the second calculated value. The verification result of whether or not the content exists in the storage location indicated by the storage location information transmitted together with the second calculated value at the date and time indicated by the acquisition date information transmitted together with the second calculated value is the information. Since the verification request processing received from the presence certificate processing device is performed, the information provider provides the information immediately after the information user browses the information provided on the Internet, an intranet, or the like. Even is rewritten, it is possible to information the information the user has browsed, reliably prove that the information provided by some information provider.

  Therefore, the reliability of the information provided by the information provider and the social reliability of the information provider itself can be improved, and the information provider is legal, including sales contracts with information users. There is an effect that it is possible to construct an information existence proof system capable of avoiding trouble.

  Hereinafter, details of the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is a block diagram showing an example of the configuration of the information presence certification system of the present invention.

  In FIG. 1, reference numeral 100 denotes an information use terminal device (a plurality of information use terminal devices), 200 denotes an information presence certificate processing device, and 300 denotes an information provision processing device, which are configured to be able to communicate via the Internet 400. In the present embodiment, the Internet 400 is described, but other networks (communication media) such as an intranet may be used. The information provision processing device 300 is a server that can provide information via a communication medium such as a WEB server, and does not indicate a specific device, but currently exists on the Internet or the like and can acquire information using a URL or the like. All servers are shown.

  The information use terminal device 100 is for a user to browse a document published on the Internet 400. The information provision processing device 300 is for publishing information (content) on the Internet 400. In the present embodiment, the content is information that can be provided by the information provision processing device 300 via a communication medium such as the Internet 400 or an intranet. Any information may be included.

  In response to a document acquisition request from the information use terminal device 100, the information presence certificate processing device 200 acquires information published by the information provision processing device 300 via the Internet 400 and transmits the information to the information use terminal device. Process. Further, in response to a registration request from the information using terminal device 100, the information presence certificate processing device 200 performs a registration process for registering the relayed information in the information presence certificate processing device 200 so that it can be verified later. Furthermore, the information presence certification processing device 200 performs verification processing for verifying that the registered information exists in the information providing processing device 300 in response to a verification request from the information using terminal device 100.

  FIG. 2 is a block diagram illustrating an example of a hardware configuration of the information use terminal device 100 illustrated in FIG. 1.

  In FIG. 2, reference numeral 101 denotes a communication interface for communicating with the Internet 400 via a router or the like (not shown). Reference numeral 102 denotes a CPU which loads various programs (such as OS and programs corresponding to the WEB browser 104) stored in the storage device 103 into the RAM 109 and executes them. It is assumed that the hash value generation unit 106 is downloaded from the information presence certificate processing apparatus 200, held in the RAM 109, and executed on the WEB browser 104.

  The storage device 103 is composed of, for example, an external storage device such as a hard disk, and via various programs executed by the CPU 102 (programs corresponding to the OS, the WEB browser 104, the hash value generation unit 106, etc.) and the information presence certification processing device 200. A content DB 105 or the like that stores content acquired from the information provision processing device 300 is stored.

  Reference numeral 107 denotes a display device such as a CRT or LCD. Reference numeral 108 denotes an input device such as a pointing device such as a keyboard and a mouse.

  FIG. 3 is a block diagram illustrating an example of a hardware configuration of the information presence certification processing apparatus 200 illustrated in FIG.

  In FIG. 3, reference numeral 201 denotes a communication interface for communicating with the Internet 400 via a router or the like (not shown). A CPU 202 loads various programs (such as programs corresponding to the OS, hash value generation unit 206, presence information registration unit 207, presence information verification unit 208, and content relay unit 210) stored in the storage device 203 into the RAM 209. And run.

  The storage device 203 is composed of an external storage device such as a hard disk, and corresponds to various programs (OS, hash value generation unit 206, presence information registration unit 207, presence information verification unit 208, and content relay unit 210) executed by the CPU 202. Program). The storage device 203 stores a content DB 205 that stores content acquired from the information provision processing device 300 in response to a document acquisition request from the information use terminal device 100, a presence information DB 204 that will be described later, and the like.

  FIG. 4 is a diagram illustrating an example of a hardware configuration of the information provision processing device 300 illustrated in FIG. 1.

  In FIG. 4, reference numeral 301 denotes a communication interface for communicating with the Internet 400 via a router or the like (not shown). A CPU 302 loads various programs (such as an OS and a program corresponding to the web server 305) stored in the storage device 303 into the RAM 306 and executes them.

  The storage device 303 is configured by an external storage device such as a hard disk, for example, and stores various programs executed by the CPU 302 (OS, programs corresponding to the web server 305, etc.), a content DB 304 released on the Internet 400, and the like.

  FIG. 5 is a record configuration diagram illustrating an example of a record configuration of the content DB 105 stored in the storage device 103 in the information user terminal device 100 illustrated in FIG. 2.

  As shown in FIG. 5, the record in the content DB 105 includes a browsing date 501, a URL 502, a content 503, and a registered flag 504.

  The browsing date and time 501 indicates the date and time when the content was stored in the information presence certification processing device 200 when the information user browsed the information (the date and time when the information presence certification processing device 200 acquired the content from the information provision processing device 300). URL 502 is information indicating the storage location of the content viewed by the information user. Hereinafter, although described as a URL, it may be information expressed in other formats as long as it is information indicating the storage location of the content.

  The content 503 is the content data itself acquired from the information provision processing device 300 via the information presence certification processing device 200. The registered flag 504 is a flag indicating whether or not presence information has been registered in the information presence certification processing apparatus 200.

  FIG. 6 is a record configuration diagram showing an example of the record configuration of the presence information DB 204 stored in the storage device 203 in the information presence certification processing device 200 shown in FIG.

  As shown in FIG. 6, the record of the presence information DB 204 includes a browsing date 601, a URL 602, and a hash value 603.

  The browsing date and time 601 indicates the date and time when the content was stored in the information presence certification processing device 200 when the information user browsed the information. The URL 602 is information indicating the storage location of the content viewed by the information user. The hash value 603 is a hash value (a value calculated using a one-way function (hash function) for preventing weak collisions) generated from content stored in the browsing date 601, URL 602, and the information existence certification processing device 200. .

  FIG. 7 is a record configuration diagram showing an example of a record configuration of the content DB 205 stored in the storage device 203 in the information presence certification processing device 200 shown in FIG.

  As shown in FIG. 7, the record in the content DB 205 includes a browsing date 701, a URL 702, and a content 703.

  The browsing date and time 701 indicates the date and time when the content was stored in the information presence certification processing device 200 when the information user browsed the information (the date and time when the information presence certification processing device 200 acquired the content from the information provision processing device 300). . The URL 702 is information indicating the location information browsed by the information user. The content 703 is content data itself acquired from the information provision processing device 300.

<Content acquisition processing operation>
Hereinafter, with reference to FIG. 8 to FIG. 11, the content acquisition processing operation in the information presence certification system constituted by the information utilization terminal device 100, the information presence certification processing device 200, and the information provision processing device 300 of the present invention will be described.

  FIG. 8 is a flowchart showing an example of a first control processing procedure in the information presence certification system configured by the information use terminal device 100, the information presence certification processing device 200, and the information provision processing device 300 of the present invention. Corresponds to the processing operation. In the figure, S101 and S102 correspond to the processing of the WEB browser 104 that the CPU 102 shown in FIG. 2 loads from the storage device 103 onto the RAM 109 and executes. S111 to S114 correspond to the processing of the relay unit 210 that the CPU 202 illustrated in FIG. 3 loads from the storage device 203 onto the RAM 209 and executes. Further, S121 and S122 correspond to the processing of the WEB server 305 that the CPU 302 shown in FIG. 4 loads from the storage device 303 onto the RAM 306 and executes.

  FIG. 9 is a schematic diagram showing an example of the presence information certification system initial screen displayed on the screen of the WEB browser 104 displayed on the display device 107 of the information utilization terminal device 100 shown in FIG.

  When the information user accesses the presence information certification system initial screen using the WEB browser 104 of the information utilization terminal device 100, a program including the hash value generation unit 206 is downloaded from the information presence certification processing device 200, and the presence information certification system initial The screen is displayed on the WEB browser 104 as shown in FIG. 9, and the presence information certification system can be used. The downloaded program including the hash value generation unit is stored in the storage device 103 or the RAM 109 as the hash value generation unit 106 and is executed on the WEB browser 104 as necessary.

  Then, when a URL is input to the URL field 1701 via the input device 108 and the send button 1702 is instructed, the processing of the flowchart of FIG. 8 is started. In step S101, the CPU 102 of the information using terminal device 100 The URL input in the URL field 1701 is transmitted to the information presence certificate processing apparatus 200 to make a content acquisition request, and a reply from the information presence certificate processing apparatus 200 is awaited.

  In step S111, when the CPU 202 of the information presence certification processing device 200 receives the URL transmitted from the information use terminal device 100, in step S112, the CPU 202 transmits the received URL to the information provision processing device 300, and the information provision processing device 300. Wait for a reply from.

  In step S121, when the CPU 302 of the information provision processing device 300 receives the URL transmitted from the information presence certificate processing device 200, in step S122, the content indicated by the received URL is displayed in the information presence certificate processing device 200 (step S121). The content acquisition request URL is transmitted to the information existence certification processing apparatus 200) that has received the URL.

  In step S113, the CPU 202 of the information presence certificate processing device 200 performs content storage processing for the content transmitted from the information provision processing device 300 (see FIG. 10 for details).

  In step S114, the CPU 202 of the information presence certification processing device 200 obtains the information stored in step S113, the information indicating the viewing date and time of the content, and the information indicating the URL of the content using the information utilization terminal device 100 (content acquisition in step S111). The request URL is transmitted to the information use terminal device 100 that has received the request URL (returned as a response in step S112). Note that if the association of the response in step S112 is possible using a cookie or the like, information indicating the viewing date and time of the content and the URL of the content may not be transmitted.

  In step S102, the CPU 102 of the information use terminal device 100 performs content storage processing of the information transmitted from the information presence certification processing device 200, information indicating the content browsing date and time, and the content URL (see FIG. 11 for details). ).

<Content Storage Processing (Information Presence Proof Processing Device 200)>
FIG. 10 is a flowchart showing an example of a second control processing procedure in the information presence certification system constituted by the information utilization terminal device 100, the information presence certification processing device 200, and the information provision processing device 300 of the present invention. This corresponds to the content storage processing operation in the information presence certification processing apparatus 200 shown in step S114. In the figure, S501 and S502 correspond to processing of the relay unit 210 that the CPU 202 shown in FIG. 3 loads from the storage device 203 onto the RAM 201 and executes.

  First, in step S501, the CPU 202 of the information presence certification processing device 200 receives the content transmitted from the information provision processing device 300 (acquires content from the information provision processing device 300).

  In step S502, the CPU 202 of the information presence certification processing device 200 displays the content received from the information providing processing device 300 in step S501, the content browsing date (date and time when the content was received), and content location information (URL and the like). The contents are stored in the contents 703 in the contents DB 205 shown in FIG. That is, the content received from the information provision processing device 300 in step S501, the content browsing date and time (date and time when the content was received), and the content location information (URL and the like) are associated and stored in the content DB 205 shown in FIG.

<Content Storage Processing (Information Utilization Terminal Device 100)>
FIG. 11 is a flowchart showing an example of a third control processing procedure in the information presence certification system configured by the information utilization terminal device 100, the information presence certification processing device 200, and the information provision processing device 300 according to the present invention. This corresponds to the content storage processing operation in the information using terminal device 100 shown in step S102. In the figure, S401 to S403 correspond to the processing of the WEB browser 104 that the CPU 102 shown in FIG. 3 loads from the storage device 203 onto the RAM 109 and executes.

  First, in step S401, the CPU 102 of the information using terminal device 100 receives the content transmitted from the information existence certification processing device 200, the content browsing date and time (date and time when the content was received), and the content location information (URL and the like). .

  In step S402, the CPU 102 of the information using terminal device 100 illustrates the URL indicating the content received from the information presence certificate processing device 200 in step S401, the content browsing date (the date when the content was received), and the location information of the content. 5 is stored in the content 503 in the content DB 105 shown in FIG. That is, the CPU 102 of the information using terminal device 100 stores the content received from the information presence certificate processing device 200 in step S401, the content browsing date (the date when the content was received), and the content location information in the content DB 105.

  In step S <b> 403, the CPU 102 of the information use terminal device 100 displays the received content on the screen of the WEB browser 104 displayed on the display device 107.

<Existence information registration processing operation>
Hereinafter, with reference to FIG. 12 to FIG. 16, the presence information registration processing operation in the information presence certification system constituted by the information utilization terminal device 100, the information presence certification processing device 200, and the information provision processing device 300 of the present invention will be described. .

  FIG. 12 is a flowchart showing an example of the fourth control processing procedure in the information presence certification system configured by the information utilization terminal device 100, the information presence certification processing device 200, and the information provision processing device 300 of the present invention. Corresponds to the registration processing operation. In the figure, S201 and S202 correspond to the processing of the WEB browser 104 executed by the CPU 102 shown in FIG. 2 loaded from the storage device 103 onto the RAM 109 and executed. S211 corresponds to the processing of the presence information registration unit 207 that the CPU 202 illustrated in FIG. 3 loads from the storage device 203 onto the RAM 209 and executes.

  FIG. 13 is a schematic diagram showing an example of a registration verification screen displayed on the screen of the WEB browser 104 displayed on the display device 107 of the information use terminal device 100 shown in FIG. Corresponds to the screen.

  When the information user accesses the registration screen of the presence information certification system using the WEB browser 104 of the information utilization terminal device 100, a program including the hash value generation unit 206 is downloaded from the information presence certification processing device 200, and the presence information certification system A registration screen is displayed on the WEB browser 104 as shown in FIG. 13, and the registration process of the presence information certification system can be used. The downloaded program including the hash value generation unit is stored in the storage device 103 or the RAM 109 as the hash value generation unit 106 and is executed on the WEB browser 104 as necessary.

  In FIG. 13, reference numeral 1801 denotes a URL list box, and a list of URLs stored in the content DB 105 is set to be selectable by the input device 108.

  When a URL is selected from the URL list box 1801 via the input device 108, a browsing date list of all records in the content DB 105 having the same URL as the URL selected in the content DB 105 is input to the browsing date list box 1802. It is set to be selectable by the device 108.

  Also, when a browsing date is selected from the browsing date list box 1802 via the input device 108, the content DB 105 is read out from the content DB 105 with the URL selected in the content DB 105, and a WEB browser is displayed as indicated by 1805. 104 is displayed in the lower area.

  A content deletion check box 1803 is used to determine whether or not to delete the corresponding record in the content DB 205 in the presence registration process, and can be checked using the input device 108.

  Reference numeral 1804 denotes a registration button. When the registration button 1804 is instructed via the input device 108, the CPU 102 of the information use terminal device 100 starts the presence registration process of FIG. 12. In step S 201, the browsing date list box 1802 is displayed. The browsing date and time, URL, content deletion or retention designation displayed in the URL list box 1801 and the content deletion check box 1803 are transmitted to the information presence certification processing device 200 to request presence information registration, and the information presence certification processing device 200 Wait for reply.

  Next, in step S211, the CPU 202 of the information presence certification processing device 200 receives the browsing date and time, URL, content deletion or retention designation transmitted from the information use terminal device 100, performs presence information registration processing, and registers the registration result. Is transmitted to the information using terminal device 100 (see FIG. 14).

  Next, in step S202, the CPU 102 of the information using terminal device 100 receives the registration result returned from the information presence certification processing device 200 and performs a presence information registration result display process (see FIG. 15).

<Presence Information Registration Process (Information Presence Certificate Processing Device 200)>
14 is a flowchart showing an example of a fifth control processing procedure in the information presence certification system configured by the information utilization terminal device 100, the information presence certification processing device 200, and the information provision processing device 300 of the present invention. This corresponds to the presence information registration processing operation in the information presence certification processing device 200 shown in step S211. In the figure, S701 to S707 correspond to the processing of the presence information registration unit 207 executed by the CPU 202 shown in FIG. 3 loaded from the storage device 203 onto the RAM 201 and executed.

  First, in step S701, the CPU 202 of the information presence certification processing device 200 receives the browsing date and time, URL, content deletion or retention designation transmitted from the information using terminal device 100. In step S702, the browsing date and time received in step S701. , The corresponding content 703 (FIG. 7) is extracted from the content DB 205 using the URL as a key.

  In step S703, the CPU 202 of the information presence certification processing apparatus 200 uses the hash generation unit 206 to generate a hash value based on the browsing date and time received in step S701, the URL, and the content extracted in step S702 (preventing weak collision prevention). A hash value is calculated using a one-way function (hash function) of sex).

  Next, in step S704, the CPU 202 of the information presence certificate processing apparatus 200 uses the browsing date and time received in step S701, the URL, and the hash value generated in step S703 as the browsing date and time 601, URL 602, and hash value 603 of the information presence information DB 204. Save (register) to. That is, the browsing date and time received in step S701, the URL, and the hash value generated in step S703 are linked and stored in the presence information DB 204. At this time, if registration is successful, information indicating that content registration has been completed is set in the registration result. If registration fails, information indicating that content registration has failed is set in the registration result. set.

  Next, in step S705, the CPU 202 of the information presence certification processing device 200 determines whether or not there is a content deletion designation in the registration request (browsing date / time, URL, content deletion or retention designation) received from the information use terminal device 100 in step S701. If it is determined that there is no content deletion designation, the process directly proceeds to step S707.

  On the other hand, in step S705, the CPU 202 of the information existence certification processing apparatus 200 determines that there is a content deletion designation in the registration request (browsing date / time, URL, content deletion or retention designation) received from the information using terminal apparatus 100 in step S701. In this case, in step S706, the corresponding record (the record retrieved using the browsing date and time and URL received in step S701 as a key) is deleted from the content DB 205, and the process proceeds to step S707.

  Next, in step S707, the CPU 202 of the information presence certification processing apparatus 200 notifies the information use terminal apparatus 100 of the registration result of the presence information registration process (the registration result set in step S704).

  In this embodiment, in step S705, it is determined whether or not there is a content deletion designation in the registration request (browsing date / time, URL, content deletion or retention designation) received from the information using terminal device 100 in step S701. Only when it is determined that there is a deletion designation, in step S706, a description has been given of a configuration in which a corresponding record (a record retrieved using the browsing date and time and URL received in step S701 as a key) is deleted from the content DB 205. Information in the content DB 205 associated with the acquisition date information and storage location information registered in the information DB 204 may be deleted from the content DB 205.

<Registration result display process (information utilization terminal device 100)>
15 is a flowchart showing an example of a sixth control processing procedure in the information presence certification system configured by the information utilization terminal device 100, the information presence certification processing device 200, and the information provision processing device 300 of the present invention. This corresponds to the presence information registration result display processing operation in the information using terminal device 100 shown in step S202. In the figure, S601 to S603 correspond to the processing of the WEB browser 104 which the CPU 102 shown in FIG. 3 loads from the storage device 203 onto the RAM 109 and executes.

  First, in step S601, the CPU 102 of the information use terminal device 100 receives the registration result of the presence information registration process transmitted from the information presence certificate processing device 200. In step S602, the CPU 102 of the information use terminal device 100 receives the content. In the DB 105, a registered flag 504 of a record that matches the browsing date and URL transmitted at the time of the presence information registration request (a record searched using the browsing date and URL transmitted in step S201 in FIG. 12 as a key) is displayed. Set “true”.

Next, in step S603, the registration result of the presence information registration process received in step S601 is displayed on the registration verification screen on the WEB browser 104 displayed on the display device 107, as indicated by 1901 in FIG. . At this time, the registration button 1804 (FIG. 13) is deleted from the registration verification screen, and the registered 1902 and the verification button 1903 are displayed on the registration verification screen. FIG. 16 shows the information using terminal device 100 shown in FIG. It is a schematic diagram which shows an example of the registration verification screen displayed on the screen of the WEB browser 104 displayed on the display apparatus 107, and respond | corresponds to the screen at the time of presence information registration result display. In addition, the same code | symbol is attached | subjected to the same thing as FIG.

  As shown in FIG. 16, in the URL list box 1801, the browsing date list boxes 1802, 1805, and 1901, the browsing date, URL, content, and content registration result of the content registered in the information presence certification processing apparatus 200 are displayed.

When registered, the registration button 1804 (FIG. 13) is deleted from the registration verification screen, and a message 1902 indicating that registration has been completed and a verification button 1903 are displayed on the registration verification screen. When the verification button 1903 is instructed via the CPU, the CPU 102 of the information using terminal device 100 starts presence information verification processing shown in FIG.

<Existence information verification processing operation>
The presence information verification processing operation in the information presence certification system configured by the information utilization terminal device 100, the information presence certification processing device 200, and the information provision processing device 300 according to the present invention will be described below with reference to FIGS. .

  FIG. 17 is a flowchart showing an example of the seventh control processing procedure in the information presence certification system configured by the information utilization terminal device 100, the information presence certification processing device 200, and the information provision processing device 300 of the present invention. Corresponds to the verification processing operation. In the figure, S301 to S303 correspond to the processing of the WEB browser 104 that the CPU 102 shown in FIG. 2 loads from the storage device 103 onto the RAM 109 and executes. S311 corresponds to the processing of the presence information verification unit 208 that the CPU 202 illustrated in FIG. 3 loads from the storage device 203 onto the RAM 209 and executes.

  When the verification button 1903 is instructed via the input device 108 on the registration verification screen illustrated in FIG. 16, the CPU 102 of the information use terminal device 100 starts the presence information verification process illustrated in FIG. 17. Using the hash value generation unit 106, a hash value is generated based on the browsing date list box 1802, the URL list box 1801, and the content 1805 displayed on the registration verification screen.

  Next, in step S302, the CPU 102 of the information utilization terminal device 100 uses the hash value generated in the browsing date list box 1802, URL list box 1801, and step S301 displayed on the registration verification screen as the information existence certification processing device 200. To the presence information verification request, and waits for a reply from the information presence certification processing device 200.

  Next, in step S311, the CPU 202 of the information presence certification processing device 200 receives the browsing date, URL, and hash value transmitted from the information use terminal device 100, performs presence information verification processing, and uses the verification result as information usage. It transmits to the terminal device 100 (refer FIG. 18).

  Next, in step S303, the CPU 102 of the information using terminal device 100 receives the verification result returned from the information presence certification processing device 200 and performs the presence information verification result display processing (see FIG. 19).

<Existence information verification processing (information existence certification processing device 200)>
FIG. 18 is a flowchart showing an example of an eighth control processing procedure in the information presence certification system constituted by the information utilization terminal device 100, the information presence certification processing device 200, and the information provision processing device 300 of the present invention. This corresponds to the presence information verification processing operation in the information presence certification processing device 200 shown in step S311. In the figure, S901 to S906 correspond to the processing of the presence information verification unit 208 that the CPU 202 shown in FIG. 3 loads from the storage device 203 onto the RAM 201 and executes.

  First, in step S901, the CPU 202 of the information presence certification processing device 200 receives the browsing date / time, URL, and hash value transmitted from the information using terminal device 100. In step S902, the CPU 202 receives the browsing date / time and URL received in step S901. Using the key, the corresponding hash value 603 is extracted from the presence information DB 204.

  In step S903, the CPU 202 of the information presence certification processing apparatus 200 compares the hash value received in step S901 with the hash value extracted in step S902, and determines whether or not the hash values match.

  If the CPU 202 of the information existence certification processing device 200 determines in step S903 that the hash value received in step S901 matches the hash value extracted in step S902, the verification result is “match” in step S904. (Accord) is set, and the process proceeds to step S906.

  On the other hand, if the CPU 202 of the information presence certification processing device 200 determines in step S903 that the hash value received in step S901 does not match the hash value extracted in step S902, the verification result is displayed in step S905. “Disagree” (discord) is set, and the process proceeds to step S906.

  In step S906, the CPU 202 of the information presence certification processing apparatus 200 sets the verification result in step S904 or S905 and notifies the information utilization terminal apparatus 100 of the verification result.

<Existence information verification result display processing (information utilization terminal device 100)>
FIG. 19 is a flowchart showing an example of a ninth control processing procedure in the information presence certification system configured by the information utilization terminal device 100, the information presence certification processing device 200, and the information provision processing device 300 of the present invention. This corresponds to the presence information registration result display processing operation in the information using terminal device 100 shown in step S302. In the figure, S801 to S802 correspond to the processing of the WEB browser 104 that the CPU 102 shown in FIG. 3 loads from the storage device 203 onto the RAM 109 and executes.

  First, in step S801, the CPU 102 of the information use terminal device 100 receives the verification result of the presence information verification process transmitted from the information presence certificate processing device 200. In step S802, the CPU 102 of the information use terminal device 100 performs the step The verification result of the presence information verification process received in S801 is displayed on the registration verification screen on the WEB browser 104 displayed on the display device 107, as indicated by 2001 in FIG.

  20 is a schematic diagram showing an example of a registration verification screen displayed on the screen of the WEB browser 104 displayed on the display device 107 of the information use terminal device 100 shown in FIG. Corresponds to the screen. In addition, the same code | symbol is attached | subjected to the same thing as FIG. 13, FIG.

  As shown in FIG. 20, the URL list box 1801, the browsing date / time list boxes 1802, 1805, and 2001 display the browsing date / time, URL, content, and content registration result of the content verified by the information existence certification processing device 200.

  As described above, in the information presence certification system according to the present invention, first, an information user can store a copy of a document provided on the Internet 400 using the information utilization terminal device 100. The information of the information provision processing device 300 is browsed via the certification processing device 200, and the browsed information (content) is stored in the content DB 105 in the information use terminal device 100. At the time of browsing, all access information (browsing date / time, URL, content) is temporarily stored in the content DB 205 in the information presence certification processing apparatus 200.

  Next, when the information user requests the presence information registration of the content stored in the content DB 105 using the information usage terminal device 100, the information usage terminal device 100 uses the viewing date and URL of the content as the presence information registration request. It transmits to the presence certificate processing device 200.

  The information presence certification processing device 200 receives the presence information registration request (browsing date / time, URL) transmitted from the information using terminal device 100, extracts the access information from the content DB 205 using the browsing date / time, URL as a key, and the access A hash value is generated from information (the browsing date / time, URL, content), the browsing date / time, URL, and hash value are registered in the presence information DB 204 as presence information, and the registration result is notified to the information using terminal device 100.

  Finally, when the information user requests the presence information verification of the content that has been registered using the information usage terminal device 100, the information usage terminal device 100 generates a hash value based on the browsing date, URL, and content of the content. Then, the browsing date / time, URL, and hash value are transmitted to the information presence certification processing apparatus 200 as a presence information registration request.

  The information presence certification processing device 200 receives a presence information verification request (browsing date / time, URL, hash value) transmitted from the information use terminal device 100, and uses the browsing date / time and URL as a key for presence information (browsing). (Date, URL, hash value) is extracted, and compared with the browsing date, URL, hash value received from the information using terminal device 100, the document is verified by confirming that it matches, and the verification result To the information using terminal device 100.

  As described above, the information user browses the information via the information existence certification processing apparatus 200 capable of storing a copy of a document provided on the Internet, and immediately after the information user browses the information Even if information is rewritten in the providing processing device, the information presence certification processing device 200 can surely acquire the same information as the information browsed by the information user, and the information browsed by a certain information user can be obtained. It is possible to reliably prove that the information is provided by a certain information provider.

  Therefore, the reliability of the information provided by the information provider and the social reliability of the information provider itself can be improved, and the information provider is legal, including sales contracts with information users. There are effects such as being able to avoid troubles.

  In the presence information verification processing by the information presence certification processing device 200 shown in FIG. 18 described above, the configuration in which only the verification result is returned to the information using terminal device 100 in step S906 has been described. However, the verification result is “match” ( In the case of (accord), an electronic certificate issued by the certificate authority may be added to the verification result and returned to the information using terminal device 100.

  Moreover, all the structures which combined the modification of the said embodiment are also contained in this invention.

  It should be noted that the configurations and contents of the various data shown in FIGS. 5 to 7 are not limited to this, and it is needless to say that they are configured with various configurations and contents according to applications and purposes.

  Although one embodiment has been described above, the present invention can take an embodiment as, for example, a system, apparatus, method, program, or recording medium, and specifically includes a plurality of devices. The present invention may be applied to a system including a single device.

  Hereinafter, referring to the memory map shown in FIG. 21, the configuration of a data processing program that can be read by the information utilization terminal device 100, the information presence certification processing device 200, and the information provision processing device 300 that constitute the information presence certification system according to the present invention. Will be described.

  FIG. 21 shows a recording medium (storage medium) for storing a data processing program that can be read by the information use terminal device 100, the information presence certificate processing device 200, and the information provision processing device 300 constituting the information presence certification system according to the present invention. It is a figure explaining a memory map.

  Although not specifically shown, information for managing a program group stored in the recording medium, for example, version information, creator, etc. is also stored, and information depending on the OS on the program reading side, for example, a program is identified and displayed. Icons may also be stored.

  Further, data depending on various programs is also managed in the directory. In addition, when a program or data to be installed is compressed, a program to be decompressed may be stored.

  8, 10, 11, 12, 14, 15, 17, 18, and 19 in this embodiment may be performed by a host computer by a program installed from the outside. Good. In this case, the present invention is applied even when an information group including a program is supplied to the output device from a recording medium such as a CD-ROM, a flash memory, or an FD, or from an external recording medium via a network. Is.

  As described above, a recording medium in which a program code of software for realizing the functions of the above-described embodiments is recorded is supplied to the system or apparatus, and the computer (or CPU or MPU) of the system or apparatus is stored in the recording medium. It goes without saying that the object of the present invention can also be achieved by reading and executing the program code.

  In this case, the program code itself read from the recording medium realizes the novel function of the present invention, and the recording medium storing the program code constitutes the present invention.

  As a recording medium for supplying the program code, for example, a flexible disk, hard disk, optical disk, magneto-optical disk, CD-ROM, CD-R, DVD-ROM, magnetic tape, nonvolatile memory card, ROM, EEPROM, A silicon disk or the like can be used.

  Further, by executing the program code read by the computer, not only the functions of the above-described embodiments are realized, but also an OS (operating system) or the like running on the computer based on the instruction of the program code. It goes without saying that a case where the function of the above-described embodiment is realized by performing part or all of the actual processing and the processing is included.

  Furthermore, after the program code read from the recording medium is written in a memory provided in a function expansion board inserted in the computer or a function expansion unit connected to the computer, the function expansion is performed based on the instruction of the program code. It goes without saying that the case where the CPU or the like provided in the board or the function expansion unit performs part or all of the actual processing and the functions of the above-described embodiments are realized by the processing.

  In addition, the present invention may be applied to a system composed of a plurality of devices or an apparatus composed of a single device. Needless to say, the present invention can be applied to a case where the present invention is achieved by supplying a program to a system or apparatus. In this case, by reading a recording medium storing a program represented by software for achieving the present invention into the system or apparatus, the system or apparatus can enjoy the effects of the present invention.

  Furthermore, by downloading and reading out a program represented by software for achieving the present invention from a server, database, etc. on a network using a communication program, the system or apparatus can enjoy the effects of the present invention. It becomes.

  Therefore, when the document presence certification processing device 200 receives an information acquisition request (URL) from the information use terminal device 100, it acquires information corresponding to the URL and sends it back to the information use terminal device 100. At this time, the information presence certification processing apparatus 200 stores all access information (browsing date / time, URL, content) in the content DB 205. Further, upon receiving the presence information registration request (browsing date / time, URL) from the information using terminal device 100, the information presence certification processing device 200 generates a hash value from the access information and associates it with the browsing date / time, URL. Register in the presence information DB 204. Further, upon receiving the presence information registration request (hash value, browsing date and time based on the hash value, URL) from the information use terminal device 100, the information presence certification processing device 200 receives the received hash value and the hash value. By comparing the browse date / time and URL that is the source of the URL corresponding to the hash value read from the presence information DB 204 and verifying whether or not the corresponding content exists in the corresponding browse date / time and URL Even if the information provider rewrites the information provided via the communication medium such as the Internet or an intranet immediately after the information user browses, the information browsed by the information user It is possible to reliably prove that the information is provided by a certain information provider.

  Therefore, the reliability of the information provided by the information provider and the social reliability of the information provider itself can be improved, and the information provider is legal, including sales contracts with information users. There is an effect that it is possible to construct an information existence proof system capable of avoiding trouble.

  Further, the information existence proof processing device 200 deletes the information in the content DB 205 associated with the acquisition date and time information and the storage location information registered in the presence information DB 204 from the content DB 205, so that the storage device that configures the content DB 205 stores the information. A large amount of content can be prevented from being stored, and memory resources can be used effectively.

It is a block diagram which shows an example of a structure of the information presence certification | authentication system of this invention. It is a block diagram which shows an example of the hardware constitutions of the information utilization terminal device shown in FIG. It is a block diagram which shows an example of the hardware constitutions of the information presence certification | authentication processing apparatus shown in FIG. It is a figure which shows an example of the hardware constitutions of the information provision processing apparatus shown in the figure. It is a record block diagram which shows an example of the record structure of content DB memorize | stored in the memory | storage device in the information user terminal shown in FIG. It is a record block diagram which shows an example of the record structure of presence information DB memorize | stored in the memory | storage device in the information presence certification | authentication processing apparatus shown in FIG. FIG. 4 is a record configuration diagram showing an example of a record configuration of a content DB stored in a storage device in the information presence certification processing device shown in FIG. 3. It is a flowchart which shows an example of the 1st control processing procedure in the information presence certification system comprised by the information utilization terminal device of this invention, an information presence certification processing apparatus, and an information provision processing apparatus. It is a schematic diagram which shows an example of the information presence certification | authentication system initial screen displayed on the screen of the WEB browser displayed on the display apparatus of the information utilization terminal device shown in FIG. It is a flowchart which shows an example of the 2nd control processing procedure in the information presence certification system comprised by the information utilization terminal device of this invention, an information presence certification processing apparatus, and an information provision processing apparatus. It is a flowchart which shows an example of the 3rd control processing procedure in the information presence certification system comprised by the information utilization terminal device of this invention, an information presence certification processing apparatus, and an information provision processing apparatus. It is a flowchart which shows an example of the 4th control processing procedure in the information presence certification system comprised by the information utilization terminal device of this invention, an information presence certification processing apparatus, and an information provision processing apparatus. It is a schematic diagram which shows an example of the registration verification screen displayed on the screen of the WEB browser displayed on the display apparatus of the information utilization terminal device shown in FIG. It is a flowchart which shows an example of the 5th control processing procedure in the information presence certification system comprised by the information utilization terminal device of this invention, an information presence certification processing apparatus, and an information provision processing apparatus. It is a flowchart which shows an example of the 6th control processing procedure in the information presence certification system comprised by the information utilization terminal device of this invention, an information presence certification processing apparatus, and an information provision processing apparatus. It is a schematic diagram which shows an example of the registration verification screen displayed on the screen of the WEB browser displayed on the display apparatus of the information utilization terminal device shown in FIG. It is a flowchart which shows an example of the 7th control processing procedure in the information presence certification system comprised by the information utilization terminal device of this invention, an information presence certification processing apparatus, and an information provision processing apparatus. It is a flowchart which shows an example of the 8th control processing procedure in the information presence certification system comprised by the information utilization terminal device of this invention, an information presence certification processing apparatus, and an information provision processing apparatus. It is a flowchart which shows an example of the 9th control processing procedure in the information presence certification system comprised by the information utilization terminal device of this invention, an information presence certification processing apparatus, and an information provision processing apparatus. It is a schematic diagram which shows an example of the registration verification screen displayed on the screen of the WEB browser displayed on the display apparatus of the information utilization terminal device shown in FIG. FIG. 3 is a diagram for explaining a memory map of a recording medium (storage medium) that stores a data processing program that can be read by an information use terminal device, an information presence certificate processing device, and an information provision processing device that constitute an information presence certification system according to the present invention. is there.

Explanation of symbols

100 Information Utilization Terminal Device 101 Communication Interface 102 CPU
103 Storage Device 104 WEB Browser 105 Content DB
106 Hash value generator 107 Display device 108 Input device 109 RAM
200 Information Presence Proof Processing Device 201 Communication Interface 202 CPU
203 Storage device 204 Presence information DB
205 Content DB
206 Hash value generation unit 207 Presence information registration unit 208 Presence information verification unit 209 RAM
210 Relay unit 300 Information provision processing device 301 Communication interface 302 CPU
303 Storage device 304 Content DB
305 WEB server 306 RAM
400 Internet

Claims (8)

In the information presence certification processing apparatus capable of communicating with the information using terminal device via a predetermined communication medium,
Receiving storage location information indicating a storage location of content from the information utilization terminal device, acquiring content based on the received storage location information, acquisition date information indicating the acquired content and acquisition date and time of the content, and Relay means for associating storage location information indicating the storage location of content with the first storage means and storing the acquired content and acquisition date information indicating the acquisition date of the content to the information using terminal device; ,
The first storage means receives the acquisition date / time information indicating the acquisition date / time of the content and the storage location information indicating the storage location of the content from the information using terminal device, and uses the received acquisition date / time information and storage location information as a key. The first calculated value is calculated from the read content, the acquisition date / time information indicating the acquisition date / time of the content, and the storage location information indicating the storage location of the content by using a one-way function of weak collision prevention And presence information registration means for associating the first calculated value and the acquisition date and time information and storage location information used for calculating the first calculated value and storing them in a second storage means,
Receiving the second calculated value calculated using the one-way function of the weak collision prevention from the information utilization terminal device, the storage location information and the acquisition date information used for calculating the second calculated value; Based on the received second calculated value, storage location information, and acquisition date / time information, the first calculated value is read from the second storage unit, and the read first calculated value and the received second calculated value are read out. The content used for calculating the second calculated value is received together with the second calculated value and received together with the second calculated value at the date and time indicated by the acquired date and time information. A presence information verification unit that determines whether or not the storage location information indicated by the storage location information exists, and transmits the determination result to the information using terminal device;
An information existence proof processing device characterized by comprising:   The presence information registration unit deletes the information in the first storage unit associated with the acquisition date information and storage location information registered in the second storage unit from the first storage unit. The information existence certification processing apparatus according to claim 1, wherein In an information using terminal device capable of communicating with an information presence certification processing device via a predetermined communication medium,
The storage location information indicating the storage location of the content is transmitted to the information presence certification processing device, and the content acquired from the storage location information and the acquisition date / time information indicating the acquisition date / time of the content in the information presence certification processing device are the information. Acquisition request means received from the presence certificate processing device;
Registration request means for transmitting the acquisition date and time information acquired by the acquisition request means and the storage location information corresponding to the acquisition date and time information to the information presence certificate processing apparatus and registering the information presence certificate processing apparatus;
The content registered in the information existence certification processing device by the registration request means, the acquisition date / time information of the content, and the storage location information of the content are calculated from the information presence certification processing device using a one-way function of weak collision prevention And calculates the calculated value and the acquisition date and time information and storage location information used to calculate the calculated value to the information existence certification processing device, and the content used to calculate the calculated value is displayed together with the calculated value. Verification request means for receiving, from the information presence certification processing device, a verification result indicating whether or not the storage location indicated by the storage location information transmitted together with the calculated value at the date and time indicated by the acquired acquisition date and time information;
An information using terminal device comprising: Storage location information indicating a storage location of content is received from an information using terminal device capable of communicating via a predetermined communication medium, content is acquired based on the received storage location information, the acquired content and the content The acquisition date / time information indicating the acquisition date / time and the storage location information indicating the storage location of the content are associated with each other and stored in the first storage unit, and the acquired content and the acquisition date / time information indicating the acquisition date / time of the content are stored in the information. A relay means for transmitting to the user terminal device;
The first storage means receives the acquisition date / time information indicating the acquisition date / time of the content and the storage location information indicating the storage location of the content from the information using terminal device, and uses the received acquisition date / time information and storage location information as a key. The first calculated value is calculated from the read content, the acquisition date / time information indicating the acquisition date / time of the content, and the storage location information indicating the storage location of the content by using a one-way function of weak collision prevention And presence information registration means for associating the first calculated value and the acquisition date and time information and storage location information used for calculating the first calculated value and storing them in a second storage means,
Receiving the second calculated value calculated using the one-way function of the weak collision prevention from the information utilization terminal device, the storage location information and the acquisition date information used for calculating the second calculated value; Based on the received second calculated value, storage location information, and acquisition date and time information, the first calculated value is read from the second storage means, and the read first feature value and the received second The content used for calculating the second calculated value is received together with the second calculated value and received together with the second calculated value at the date and time indicated by the acquired date and time information. An information presence certification processing device having presence information verification means for determining whether or not the storage location information indicated by the storage location information exists and transmitting the determination result to the information using terminal device;
The storage location information indicating the storage location of the content is transmitted to the information presence certification processing device, and the content acquired from the storage location information and the acquisition date / time information indicating the acquisition date / time of the content in the information presence certification processing device are the information. Acquisition request means received from the presence certificate processing device;
Registration request means for transmitting the acquisition date and time information acquired by the acquisition request means and the storage location information corresponding to the acquisition date and time information to the information presence certificate processing apparatus and causing the information presence certificate processing apparatus to register;
The content registered in the information existence proof processing device by the registration request means, the acquisition date / time information of the content, and the storage location information of the content from the information presence proof processing device using the one-way function of weak collision prevention A second calculated value is calculated, and the second calculated value and the acquisition date / time information and storage location information used for calculating the second calculated value are transmitted to the information existence certification processing device, and the second calculated value is calculated. Whether or not the content used to calculate the value exists in the storage location indicated by the storage location information transmitted together with the second calculated value at the date and time indicated by the acquisition date and time information transmitted together with the second calculated value An information use terminal device comprising verification request means for receiving a verification certificate result from the information presence certificate processing device;
An information existence proof system characterized by comprising: In the information presence certification method in the information existence certification processing device capable of communicating with the information using terminal device via a predetermined communication medium,
Receiving storage location information indicating a storage location of content from the information utilization terminal device, acquiring content based on the received storage location information, acquisition date information indicating the acquired content and acquisition date and time of the content, and A relay step of storing storage location information indicating a storage location of the content in the first storage unit and transmitting the acquired content and acquisition date / time information indicating the acquisition date / time of the content to the information using terminal device; ,
The first storage means receives the acquisition date / time information indicating the acquisition date / time of the content and the storage location information indicating the storage location of the content from the information using terminal device, and uses the received acquisition date / time information and storage location information as a key. The first calculated value is calculated from the read content, the acquisition date / time information indicating the acquisition date / time of the content, and the storage location information indicating the storage location of the content by using a one-way function of weak collision prevention A presence information registration step of associating the first calculated value and the acquisition date and time information and storage location information used for calculating the first calculated value and storing them in a second storage means;
Receiving the second calculated value calculated using the one-way function of the weak collision prevention from the information utilization terminal device, the storage location information and the acquisition date information used for calculating the second calculated value; Based on the received second calculated value, storage location information, and acquisition date / time information, the first calculated value is read from the second storage unit, and the read first calculated value and the received second calculated value are read out. The content used for calculating the second calculated value is received together with the second calculated value and received together with the second calculated value at the date and time indicated by the acquired date and time information. A presence information verification step of determining whether or not the storage location information indicated by the storage location information exists, and transmitting the determination result to the information using terminal device;
An information existence proof method characterized by comprising: In the information presence certification method in the information using terminal device capable of communicating with the information presence certification processing device via a predetermined communication medium,
The storage location information indicating the storage location of the content is transmitted to the information presence certification processing device, and the content acquired from the storage location information and the acquisition date / time information indicating the acquisition date / time of the content in the information presence certification processing device are the information. An acquisition request step received from the presence certificate processing device;
A registration request step of transmitting the acquired acquisition date and time information and storage location information corresponding to the acquisition date and time information to the information existence certification processing device and registering the information presence certification processing device;
Calculating a calculated value of the content registered in the information existence proof processing device, the acquisition date and time information of the content, and the storage location information of the content from the information presence proof processing device using a one-way function of weak collision prevention; The acquisition date and time when the calculated value and the acquisition date and time information and storage location information used to calculate the calculated value are transmitted to the information existence certification processing apparatus, and the content used to calculate the calculated value is transmitted together with the calculated value A verification request step for receiving a verification result indicating whether or not the storage location indicated by the storage location information transmitted together with the calculated value at the date and time indicated by the information from the information presence certification processing device;
An information existence proof method characterized by comprising:   A program for executing the information existence proving method according to claim 5 or 6.   A recording medium storing a computer-readable program for executing the information presence certification method according to claim 5.

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