JP2007310678A - Alibi proving system and method, alibi server, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable persons to easily prove when and where they have been (their alibis) for themselves. <P>SOLUTION: A server creates at least one question including as a choice of answers shared information stored in a DB and information other than the shared information, and sends it to an access user terminal. An answer chosen by the access user from among the choice of answers to the question sent from the server is sent to the server. The server stores in the DB the result of matching the answer sent from the access user terminal against the shared information, and the question/answer content. Information matching a verifier terminal making an access verification request and the information stored in the DB are sent as alibi content from the DB to the verifier terminal. The verifier terminal determines whether or not the operator of the access user terminal is the correct operator of the access user terminal for whom the access verification request has been made according to the alibi content acquired from the server. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an alibi certification system and method, an alibi server, and a program for proving that a user is located at a certain time (alibi certification), and in particular, terminal operation by accessing a specific server from a terminal. The present invention relates to an alibi certification system and method, an alibi server and a program for performing an alibi certification of a person.

  To prove when and where you were (Alibi), you have to rely on third-party testimony, and there is no way to prove Alibi yourself.

  In the conventional technique of checking an alibi by e-mail or telephone, it is possible to ask someone else to substitute or to disguise. In a system using biometric authentication as a conventional technique, a special device is required, and the use place is limited.

  Furthermore, even when certifying using a telephone, it is not possible to confirm whether the operator is the person himself, and it is impossible to prevent impersonation by a third party. In addition, as a biometric authentication for accurately performing identity verification, a method using fingerprint authentication requires a special device and is expensive.

In addition, there is an information search unit that searches and acquires information using current location information by a satellite positioning system (GPS) function mounted on a terminal (see, for example, Patent Document 1). However, it is not possible to clearly prove the alibi of the terminal user.
JP 2001-264090 A

  As mentioned above, it is very difficult to prove when and where the person was by himself, and it is highly likely that the person can be signed with biometric authentication, but special and expensive equipment is required. And However, it is possible for the confirmer to confirm that he / she is the person by presenting the information to the person himself / herself who can only know the person.

  In recent years, with the development of satellite positioning systems, for example, GPS, small-sized terminals equipped with a GPS function are widely available in the world, and it is easy to provide position information by GPS.

  The present invention has been made in view of the above points, and an object of the present invention is to provide an alibi certification system and method, an alibi server, and a program by which the person himself can easily prove when and where the person was. To do.

  FIG. 1 is a diagram for explaining the principle of the present invention.

According to the present invention (Claim 1), a communication network and one or a plurality of accessor terminals connected to the communication network, one or a plurality of confirmer terminals, and an alibi server are provided at a place at a certain time. An alibi proof method in an alibi proof system for proving that it was located,
The alibi server
Perform an account transmission step (step 1) for transmitting the account uniquely assigned to the accessor terminal and the confirmer terminal to both sides,
The verifier terminal
A shared information transmission step (step 2) is performed in which the shared information shared only with the accessor is transmitted to the alibi server together with the account of the accessor requesting access confirmation,
The alibi server
A registration step (step 3) for registering an accessor's account and shared information transmitted from the confirmer terminal in an accessor list associated with the accessor in the client DB;
When access is accepted from the accessor terminal, an accessor information storage step (step 4) for storing the account, access date and time and connection IP address of the accessor terminal in an access recording area in the client DB;
A question creation step (step 5) for creating at least one question including the shared information stored in the client DB and any one or more information other than the shared information as an answer option, and transmitting it to the access terminal; , And
In the accessor terminal,
An answer step (step 6) of sending the answer selected by the accessor from the answer choices of the question sent from the alibi server to the alibi server is performed,
In the alibi server,
When the answer sent from the accessor terminal is included in the shared information, it is determined that the answer is correct, and the confirmation result corresponding to the accessor in the client DB includes the determination result and information including date / time, location, and question / answer contents Answer determination step (step 7) to be stored in the list;
The information corresponding to the confirmer terminal that made the access confirmation request from the confirmer list in the client DB and the information stored in the access recording area in the client DB are transmitted to the confirmer terminal as the alibi content. And an alibi transmission step (step 8),
The verifier terminal
Based on the alibi content acquired from the alibi server, a verification step (step 9) is performed for determining whether or not the operator of the accessor terminal is the correct operator of the accessor terminal that requested access confirmation.

Further, according to the present invention (Claim 2), in the answering step, the accessor terminal
Along with the answer, send any Web or mail server connection information to the alibi server,
The alibi server
The access from the accessor terminal is recorded in the access record field in the client DB, and only when the response from the accessor terminal exceeds a certain correct answer rate, based on the connection information specified by the accessor terminal Then, the access terminal is connected to the Web or mail server.

Further, the present invention (Claim 3), in the confirmer terminal, when authenticating an accessor including information from other confirmer terminals after the verification step,
Send a proof data request to an accessee to be authenticated by a terminal other than the confirmer terminal to the alibi server,
The alibi server
In response to a question from one or more confirmer terminals other than the proof data requester, read the access terminal's access terminal's alibi content from the client DB and send it to the confirmer terminal of the proof data requester,
The confirmer terminal of the certification data requester
Using one or more alibi contents transmitted from the alibi server, a process of determining whether or not the operator of the accessor terminal is the correct operator of the accessor terminal that requested access confirmation is further performed.

Further, the present invention (Claim 4) is provided in an accessor terminal.
Authenticate with the alibi server by an authentication method that the operator of the accessor terminal cannot know,
When answering a question sent from an alibi server,
Using the satellite positioning system function provided inside the accessor terminal, together with the answer to the question, concealing the current location information acquired by the satellite positioning system function, and sending it to the alibi server along with the answer,
The alibi server
The answer and position information transmitted from the accessor terminal are transmitted to the confirmer terminal as the alibi content.

  FIG. 2 is a principle configuration diagram of the present invention.

The present invention (Claim 5) is at a certain time composed of a communication network and one or more accessor terminals, one or more checker terminals 4 and an alibi server 2 connected to the communication network. An alibi proof system that proves that the place was located,
The alibi server 2
Account transmitting means 21 for transmitting the account uniquely given to each of the accessor terminal 3 and the confirmer terminal 4 to both;
Shared information registration means 29 for registering the accessor's account and shared information transmitted from the checker terminal 4 in an accessor list associated with the accessor in the client DB;
When access is accepted from the accessor terminal 3, the access information management means 22 stores the account of the accessor terminal 3, the access date and time, and the connection IP address in an access recording area in the client DB 201;
A question creation means 23 for creating at least one question including the shared information stored in the client DB 201 and any one or more information other than the shared information as an answer option, and transmitting the question to the accessor terminal 3;
When an answer to the question is received from the accessor terminal 3 and the answer is included in the shared information, the answer is determined to be correct, and the information including the determination result and the date, place, question / answer contents is stored in the client DB. Answer determination means 28 to be stored in a checker list corresponding to the accessor of
The information corresponding to the confirmer terminal that made the access confirmation request from the confirmer list in the client DB 201 and the information stored in the access recording area in the client DB 201 are transmitted to the confirmer terminal 4 as the alibi content. An alibi content transmitting means 20 for
Have
The confirmer terminal 4
Shared information transmitting means 45 for transmitting shared information shared only with the accessor to the alibi server 2 together with the account of the accessor requesting access confirmation;
Accessor determination means 46 for determining whether or not the operator of the accessor terminal 3 is an operator of the correct accessor terminal that requested access confirmation based on the alibi content acquired from the alibi server 2. ,
The accessor terminal 3
Response means for transmitting to the alibi server 2 an answer selected by the accessor from answer options of the question transmitted from the alibi server 2 is provided.

Further, the present invention (Claim 6) provides a response means of the accessor terminal 3,
Along with the answer, it further has means for transmitting connection information of an arbitrary Web or mail server to the alibi server 2,
The alibi server 2
The access from the accessor terminal 3 is recorded in the access record field in the client DB 201, and based on the connection information specified by the accessor terminal only when the response from the accessor terminal exceeds a certain correct answer rate. And means for connecting the access terminal with the Web or mail server.

Further, the present invention (Claim 7), in the confirmer terminal 4, when authenticating the accessor including information from other confirmer terminals,
The confirmer terminal 4
After performing the accessor determination means 46, means for requesting certification data for an accessor to be authenticated other than the terminal from the alibi server 2;
Means for determining whether or not the operator of the accessor terminal is an operator of the correct accessor terminal that requested access confirmation, using one or more alibi contents transmitted from the alibi server 2;
The alibi server 2
Means for receiving a proof data request;
In response to a question from one or more confirmer terminals other than the certification data request source, the content of the access terminal of the access terminal to be authenticated is read from the client DB 201 and transmitted to the confirmer terminal 4 of the certification data request source. And means.

Further, the present invention (claim 8) is the accessor terminal 3,
Means for authenticating with an alibi server by an authentication method that the operator of the accessor terminal cannot know;
A satellite positioning system device provided in the access terminal 3;
When answering the question transmitted from the alibi server 2, the satellite positioning system device is used to conceal the location information of the current location obtained by the satellite positioning system function together with the answer to the question. Means for transmitting to the server 2;
The alibi server 2
Means for transmitting the response and position information transmitted from the accessor terminal 3 to the confirmer terminal as the alibi content.

The present invention (Claim 9) has a communication network and one or more accessor terminals connected to the communication network, one or more checker terminals, and the access to the checker terminal An alibi server in an alibi proof system for proving that an accessor of a user terminal was located at a certain location at a certain time,
Account transmitting means for transmitting the account uniquely assigned to the accessor terminal and the confirmer terminal to both sides,
Shared information registration means for registering the accessor's account and shared information transmitted from the confirmer terminal in an accessor list associated with the accessor in the client DB;
Upon receiving access from the accessor terminal, an access information management means for storing the accessor terminal account, access date and time, and connection IP address in an access recording area in the client DB;
A question creating means for creating at least one question including shared information stored in the client DB and any one or a plurality of information other than the shared information as an answer option, and transmitting the question to the accessor terminal;
The answer to the question is received from the accessor terminal, and when the answer is included in the shared information, the answer is determined to be correct, and the information including the determination result and the date, place, question / answer contents is accessed by the accessor in the client DB. Answer determination means for storing in the checker list corresponding to
The information corresponding to the confirmer terminal that made the access confirmation request from the confirmer list in the client DB and the information stored in the access recording area in the client DB are transmitted to the confirmer terminal as the alibi content. And an alibi content transmitting means.

  The present invention (Claim 10) is an alibi certification program that causes a computer to execute each means of the alibi server according to Claim 9.

  As described above, according to the present invention, the terminal user can prove when and where the person was by the person himself / herself by presenting information that can be known only between the person and the confirmer as an answer to the question. .

  In addition, the confirmer can also confirm when and where the other party wants to be, while preventing impersonation.

  Also, the system vendor can gain access by paying access operation and charging terminal users, and the communication network vendor can obtain a communication usage traffic usage fee.

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

  In the following description, being located at a certain time will be described as “alibi”.

[First Embodiment]
FIG. 3 is a system configuration diagram according to the first embodiment of the present invention.

  The system shown in FIG. 1 includes a communication network 1, an alibi server 2, an accessor terminal 3, and a confirmer terminal 4.

  In the system, an accessor terminal 3 of an accessor and a checker terminal 4 of a checker 6 are connected to an alibi server 2 via a communication network 1.

  The communication network 1 is a public communication network, which is a wired or wireless communication network, and is capable of Internet communication.

  The accessor terminal 3 and the confirmer terminal 4 are, for example, personal computers or mobile phone terminals, and are terminals having functions capable of performing IP (Internet Protocol) communication and communication network search.

  FIG. 4 shows the configuration of the accessor terminal in the first embodiment of the present invention.

  The accessor terminal 3 includes an account acquisition unit 31, a communication unit 32, an input / output control unit 33, and a storage unit 34. The input / output control unit 33 is connected to a display device such as a display and an input device such as a keyboard and a mouse. Has been.

  The account acquisition unit 31 of the accessor terminal 3 acquires an account uniquely given to each user from the alibi server 2 in advance and stores it in the storage unit 34.

  The storage unit 34 stores an account that requests access confirmation.

  The communication unit 32 receives the question transmitted from the alibi server 2 and transmits an answer to the question.

  The input / output control unit 33 displays the received question or accepts an input from the accessor 5.

  FIG. 5 shows the configuration of the confirmer terminal according to the first embodiment of the present invention.

  The confirmer terminal 4 includes an account acquisition unit 41, a shared information registration unit 45, a communication unit 42, an input / output control unit 43, and a determination unit 46.

  The account acquisition unit 41 acquires an account uniquely given in advance from the alibi server 2 and stores it in the storage unit 44.

  The shared information registration unit 45 registers a plurality of shared information shared only with the accessor 5 together with the account of the access terminal 3 in the alibi server 2 via the communication unit 42.

  The communication unit 42 transmits the common information to the alibi server 2 and receives the access date / time, the connection IP address, the answer rate of the question, the content of the incorrect answer, and the like.

  The determination unit 46 determines whether or not the accessor 5 of the access terminal 3 is a valid operator of the accessor terminal that requested access confirmation. If the accessor 5 is a valid operator of the accessor terminal, the accessor terminal Confirm that the date and time when 3 accesses the alibi server 2 is correct. The confirmation result is output to the input / output control unit 43.

  The input / output control unit 43 receives an input from the confirmer 6 and displays the confirmation result of the determination unit 46 on the display.

  In addition, although the structure of the accessor terminal 3 and the confirmer terminal 4 is each described above, the structure of these terminals may be the same.

  FIG. 6 shows the configuration of the alibi server in the first embodiment of the present invention.

  The alibi server 2 includes an account management unit 21, an access control unit 22, a question creation unit 23, a session control unit 24, an authentication unit 25, a billing unit 26, a communication unit 27, a client DB 201, a usage history storage unit 202, a memory 204, a question The control unit 28 is configured.

  The account management unit 21 uniquely determines an account for each of the accessor 5 and the checker 6, transmits the account uniquely to the accessor terminal 3 and the checker terminal 4 via the communication unit 27, and sends the account to the client DB 201. Store.

  When receiving access from the accessor terminal 3, the access control unit 22 records the account of the accessor terminal 3 and the access date and time in the client DB 201. Also, access from the confirmer terminal 4 is accepted, and the shared information transmitted from the confirmer terminal 4 is registered in the client DB 201. In addition, the access history (access / confirmation), access date / time, connection IP address, and the like are stored in the use history storage unit 202 for each accessor and checker who has accessed the alibi server.

  The question creating unit 23 creates one or a plurality of questions including a plurality of pieces of information in answer options, and stores them in the client DB 201.

  The question control unit 28 reads one or a plurality of questions from the client DB 201 and transmits them to the accessor terminal 3. Also, an answer from the accessor terminal 3 for the question is acquired, a correct answer or an incorrect answer is determined, and the determination result is stored in the client DB 201.

  The client DB 201 has a client field, an access record field, an accessor list, and a confirmer list.

  The client field stores basic information about the client such as the account name, password, user attribute (name, address, etc.) of the accessor and the confirmer, and is used for user authentication and the like.

  In the access record field, the access date / time / connection IP address is stored for each account name every time the accessor or the confirmer accesses.

  The accessor list stores an account name for each accessor in association with the confirmer, a question list (word list, questions and answers) and options (shared number of questions, number of questions, and question format) as shared information. .

  In the confirmer list, the answer rate, date / time place, and question / answer contents are stored for each confirmer in association with the accessor.

  The usage history storage unit 202 stores the usage status of the accessed client (accessor, confirmer), and is used to eliminate unauthorized access or charge a fee. The stored data stores the contents of the access record field of the client DB 201 in time series.

  The authentication unit 35 authenticates whether each account of the accessing user and the confirming user is correct. As an authentication method, a method of verifying whether the account is already registered with reference to the client field of the client DB 201 or whether the logged-in password matches the registered password can be considered.

  The charging unit 26 refers to information in the usage history storage unit 202 periodically or at an arbitrary timing, and performs a charging process according to the time and number of times used by the confirmer or the accessor.

  The session control unit 24 controls each operation described above.

  Next, the operation in the above configuration will be described.

  FIG. 7 is a sequence chart of the operation in the first embodiment of the present invention.

  Step 101) When an account creation request is issued from the accessor and the confirmer in the account management unit 21 of the alibi server 2, the account uniquely determined for each of the accessor terminal 3 and the confirmer terminal 4 is assigned to the client of the client DB 201. The information is read from the field and transmitted to the accessor terminal 3 and the confirmer terminal 4 via the communication unit 27.

  Step 102) The account acquisition unit 41 of the confirmer terminal 4 acquires the own account and the accessor's account transmitted from the alibi server 2 and stores them in the storage unit 44.

  Step 103) The account acquisition unit 31 of the accessor terminal 3 acquires the own account and the confirmer's account transmitted from the alibi server 2 and stores them in the storage unit 34.

  Step 104) The shared information registration unit 45 of the confirmer terminal 4 transmits to the alibi server 2 a plurality of shared information shared only with the accessor 5 together with the account of the accessor terminal 3 that requests access confirmation.

  Step 105) The access control unit 22 of the alibi server 2 acquires the shared information and registers it in the accessor list associated with the confirmer 6 of the client DB 201.

  Step 106) The accessor terminal 3 logs in.

  Step 107) The access control unit 22 of the alibi server 2 receives the login of the accessor terminal 3, and records the access date and time and the connection IP address of the access terminal 3 in the access record field of the client DB 201. Further, the question creating unit 23 creates questions at random and stores them in the accessor list corresponding to the confirmer 6 in the client DB 201. At this time, a plurality of questions including one or a plurality of pieces of shared information registered by the checker 6 who requested access confirmation to the accessor terminal 3 and one or a plurality of pieces of information other than the shared information as answer options are created. To do.

  Step 108) The question control unit 28 of the alibi server 2 reads out the question created in Step 107 from the accessor list of the client DB 201 and transmits it to the accessor terminal 3.

  Step 109) The accessor terminal 3 receives the question, displays the question to the accessor 5 in the input / output control unit 33, accepts an answer to the question from the accessor 5, and passes through the communication unit 32. The response is sent to the alibi server 2.

  Step 110) The alibi server 2 receives the answer from the accessor terminal 3.

  Step 111) The question control unit 28 of the alibi server 2 determines whether the answer is correct or incorrect by referring to the accessor list corresponding to the confirmer 6 of the client DB 201 for the received answer, and the result is the answer date and time. At the same time, it is stored in the checker list for the accessor 5 in the client DB 201. At this time, the question control unit 28 of the alibi server 2 calculates an answer rate for the question and stores it in the checker list.

  Step 112) The confirmer terminal 4 transmits an access certification data request including its own account information and the account information of the accessor 5 to the alibi server 2.

  Step 113) The question control unit 28 of the alibi server 2 searches the accessor list for the confirmer 6 in the client DB 201 based on the confirmer's account and the accessor's account, and responds. Create information. The created response information is information provided to the confirmer 6 and includes information such as the correct answer rate of the accessor, the answer result of the question, the access time, the IP address, and the location.

  Step 114) The question control unit 28 of the alibi server 2 refers to the access record field of the client DB 201 based on the account information of the accessor 5, acquires the access date and time and the connection IP address of the accessor 5, and accesses the accessor 5 The confirmation rate list for the question and the content of the wrong answer are acquired, and proof data is created and transmitted to the confirmer terminal 4.

  Step 115) The confirmer terminal 4 receives the certification data of Step 114.

  Step 116) The input / output control unit 43 of the checker terminal 4 displays the access status of the certification data on the display.

  Next, the operation of the above alibi server 2 will be described.

  FIG. 8 is a sequence chart of the operation of the alibi server in the first embodiment of the present invention.

  Step 201) Based on the account creation request from the accessor terminal 3 or the confirmer terminal 4 which is the client, the alibi server 2 stores the account in the client field of the client DB 201 as shown in FIG. A name (accessor 5, confirmer 6), password, and user attributes (name, address, etc.) are created and transmitted to the accessor terminal 3 and the confirmer terminal 4.

  Step 202) When the alibi server 2 obtains the registration access of the shared information shared between the accessor terminal 3 and the checker terminal 4 from the checker terminal 4 of the checker 6, the authentication unit 25 sets the client field of the client DB 201 in the authentication unit 25. By referring to this, it is authenticated whether the account of the checker terminal 4 is correct. As the registration access, the account of the confirmer terminal 4, the account of the accessor terminal 3, and the shared information are received. If each verifier terminal can be authenticated, the process proceeds to step 203. If the authentication fails, the process returns to step 202.

  Step 203) The client DB 201 stores the shared information in the accessor list for the confirmer.

  Step 204) When the login for access certification from the accessor terminal 3 is received via the communication unit 27, the authentication unit 25 authenticates whether the account and password of the accessor 5 are correct with reference to the client DB 201. If the authentication is successful, the process proceeds to step 205. If the authentication is unsuccessful, the process returns to step 204.

  Step 205) The client DB 201 records the account information, access date and time, and connection IP address of the accessor terminal in the access record field.

  Step 206) In the question creating unit 23, a question including answer options including shared information and other information stored in the accessor list for the confirmer in the client DB 201 in Step 203 is created and stored in the client DB 201. At the same time, it is transmitted to the accessor terminal 3.

  Specifically, as shown in FIG. 10, the account name of the accessor terminal 3 and “や” and “rose” that are shared information are stored in the accessor list for the confirmer 6 of the client DB 201. Here, the question list includes a word list, a question, and a correct answer to the question, as shown in FIG. Also, as an option, the number of questions to be authenticated, the number of questions, the question format (for example, 10 questions / word selection method), and the like are stored.

The confirmer has a pattern in which only the shared information is described in the question list and a question is automatically generated therefrom, and an actual question is described and output as it is. Examples of questions that are automatically generated include:
“Akita, Niigata, Shiraishi, Kondo, Italy, America, Yellow, Green, Kinshicho, Green Line, Taiga Drama” Choose from these five common words. ]
And the answer to the question can be used as shared information.

  The process of the question creating unit 23 is triggered by a login for access certification from the accessor terminal 3, but may be triggered by a question setting request issued from the checker terminal 4. Good.

  Step 207) Upon receiving the answer to the question created in Step 206 from the accessor terminal 3 via the communication unit 27, the question control unit 28 sends a correct answer to the question on the accessor list for the checker 6 in the client DB 201. With reference to this, the correctness / incorrectness of the received answer is determined, and the answer rate, date / place, question / answer contents, etc. are recorded in the checker list for the accessor 5 of the client DB 201. Here, the answer rate is the ratio of either the number of answers to the number of questions or the number of correct answers, the date and time is the date and time when the answer is received, and the location is, for example, an IP address. The question is acquired from the accessor list, and the answer is recorded as the received answer. In the case of a multiple selection type, the correct answer number can be given as a score.

  Step 208) When a request for access certification data of the accessor 5 is received from the checker terminal 4 via the communication unit 27, the authentication unit 35 refers to the client DB 201 to check whether the accounts of the checker terminal 4 and the accessor 5 are correct. And authenticate. If the authentication is successful, the process proceeds to step 209. If the authentication is unsuccessful, the process returns to step 208.

  Step 209) The session control unit 24 reads the date / time, answer rate, question / answer contents, etc. from the checker list for the accessor 5 of the client DB 201 recorded in Step 207, and connects the accessor 5 from the access record field. An IP address is acquired, access certification data is generated, and transmitted to the confirmer terminal 4 via the communication unit 27.

  Next, an operation when an accessor list and a checker list are created in the client field of the client DB 201 will be described.

  FIG. 11 is a diagram for explaining the processing at the time of creating the accessor list / checker list according to the first embodiment of the present invention.

  Step 301) The accessor 5 who wants to receive the alibi certification service transmits a participation request from the accessor terminal 3 to the alibi server 2.

  Step 302) The alibi server 2 authenticates the accessor 5 in the authentication unit 25, and then asks the confirmer terminal 4 to confirm the addition to the confirmer list.

  Step 303) The confirmer 6 approves from the confirmer terminal 4 and transmits the approval information to the alibi server 2.

  Step 304) Upon receiving the approval information from the confirmer terminal 4 in Step 303, the alibi server 2 adds the account name of the confirmer 6 to the confirmer list for the accessor 5 in the client DB 201, and for the confirmer 6 The account of the accessor 5 is additionally recorded in the accessor list, and the accessor terminal 3 is notified of the completion of the work for adding the accessor.

  Next, the alibi confirmation process in step 208 of FIG. 8 will be described in detail.

  FIG. 12 is a diagram for explaining the alibi confirmation process according to the first embodiment of this invention.

  When the alibi server 2 receives the alibi confirmation request of the accessor 5 from the confirmer terminal 4 (step 2081 (step 112)), the question control unit 28 creates a response (step 2082). At that time, the question control unit 28 reads out the response rate / date / time location / question / answer content recorded in the row of the checker 6 (account name) in the checker list for the accessor 5 of the client DB 201, and the client The connection IP address of the accessor is acquired from the access record field of the DB 201, and is transmitted to the checker terminal 4 as proof data.

  As a result, the confirmer terminal 4 displays the access date and time, the connection IP address, the answer rate / incorrect answer content, etc. on the display. The confirmer 6 can confirm that the accessor 5 has definitely accessed by browsing the display contents.

[Second Embodiment]
FIG. 13 shows a system configuration in the second embodiment of the present invention. In the figure, the same components as those of the first embodiment shown in FIG. 3 are denoted by the same reference numerals, and the description thereof is omitted.

  The system shown in FIG. 13 has a configuration in which a Web or mail server 8 is added to the configuration of FIG.

  In the present embodiment, the accessor terminal 3 logs in and accesses the alibi server 2 in order to carry out the alibi certification, and the alibi server 2 indicates that the access is made from the accessor terminal 3 in the access record field of the client DB 201. The access terminal 3 makes a transfer connection to the Web or mail server 8 designated by the accessor terminal 3 at the same time as the access, and the accessor terminal 3 can verify the access to the alibi server 2 in one operation. Registration and connection to a Web or mail server 8 other than the alibi server 2.

  FIG. 14 shows the configuration of the alibi server in the second embodiment of the present invention. In the figure, the same parts as those in FIG. 6 in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted. The alibi server 2 shown in FIG. 14 has a configuration in which an access transfer connection unit 51 for connecting the accessor terminal 3 to the Web / mail server 8 is added to the configuration of FIG.

  The operation in the above configuration will be described below.

  FIG. 15 is a sequence chart of operations in the second embodiment of the present invention.

  Step 501) In the count management unit 21 of the alibi server 2, the account uniquely determined for each of the accessor terminal 3 and the confirmer terminal 4 is read from the client field of the client DB 201 and accessed by the accessor terminal 3 via the communication unit 27. And transmitted to the confirmer terminal 4.

  Step 502) The account acquisition unit 41 of the confirmer terminal 4 acquires the account transmitted from the alibi server 2 and stores it in the storage unit 44.

  Step 503) The account acquisition unit 31 of the accessor terminal 3 acquires the account transmitted from the alibi server 2 and stores it in the storage unit 34.

  Step 504) The shared information registration unit 45 of the confirmer terminal 4 receives the plurality of shared information shared only with the accessor 5 together with the own account information and the account information of the accessor terminal 3 that requests access confirmation. It is transmitted to the alibi server 2 together with the account information.

  Step 505) The access control unit 22 of the alibi server 2 acquires the shared information and registers it in the accessor list for the confirmer 6 of the client DB 201.

  Step 506) The accessor terminal 3 logs in to the alibi server 2 at the date and time when it is desired to prove access, and designates the IP address of the Web or mail server 8 to be connected at the same time.

  Step 507) The alibi server 2 records the access date and time and the IP address of the Web or mail server that requested the connection in the access record field of the client DB 201.

  Step 508) The same processing as the above-mentioned Step 204 to Step 207 is performed, and the access transfer connection unit 51 of the alibi server 2 refers to the checker list of the client DB, and the response rate is equal to or higher than a predetermined correct answer rate. Connects the accessor terminal 3 and the Web or mail server 8 based on the connection IP address recorded in step 507.

  As a result, it is possible to transfer to the e-mail or Web that the confirmer wants the accessor to see.

[Third Embodiment]
FIG. 16 shows a system configuration in the third embodiment of the present invention.

  The system shown in the figure has a configuration in which a checker terminal 10 of a checker 15 is further added to the configuration of FIG. 3 in the first embodiment described above. In FIG. 16, the same components as those in FIG. 3 are denoted by the same reference numerals, and the description thereof is omitted.

  In the present embodiment, the confirmer terminal 4 receives the account of the accessor 5 from the alibi server 2, the contents of the answer to the question, and the access date and time, and the date and time when the accessor terminal 3 is accessing the alibi server 2 and the answer to the question Confirming access to the accessor terminal 3 when determining whether or not the accessor received from the alibi server 2 is a true operator of the accessor terminal that requested access confirmation based on the rate and response content This is a system in which the checker terminal 4 has means for receiving a response rate to a question from another checker terminal 10 that has made the request and contributing to the success / failure determination of the accessor terminal 3.

  FIG. 17 is a sequence chart of the operation in the third embodiment of the present invention.

  Step 601) In the count management unit 21 of the alibi server 2, the account uniquely determined for each of the accessor terminal 3 and the confirmer terminal 4 is read from the client field of the client DB 201 and accessed by the accessor terminal 3 via the communication unit 27. And transmitted to the confirmer terminal 4.

  Step 602) The account acquisition unit 31 of the accessor terminal 3 acquires the account transmitted from the alibi server 2 and stores it in the storage unit 34.

  Step 603) The account acquisition unit of the checker terminal 4 acquires an account and stores it in the storage unit 44.

  Step 604) The shared information registration unit 45 of the confirmer terminal 4 transmits a plurality of shared information shared only with the accessor 5 to the alibi server 2 together with the own account information and the account information of the accessor terminal 3 that requests access confirmation. To do.

  Step 605) The access control unit 22 of the alibi server 2 acquires the shared information and registers it in the accessor list of the client DB 201.

  Step 606) The confirmer terminal 10 acquires an account from the alibi server 2 and stores it in the storage unit.

  Step 607) The confirmer terminal 10 registers the shared information with the accessor 5 together with the account information of the accessor 5 in the alibi server 2.

  Step 608) The alibi server 2 stores the shared information registered in Steps 604 and 607 in the accessor list for the confirmer 6 and the confirmer 15 in the client DB 201.

  Step 609) The access terminal 3 logs into the alibi server 2 at the date and time when it is desired to prove that it has accessed.

  Step 610) The question creating unit 23 of the alibi server 2 records the account of the accessor terminal 3, the access date and time, and the route connection IP address in the access record field of the client DB 201, and also confirms the access to the accessor 5 A plurality of questions including one or a plurality of pieces of shared information registered by 4 and any one or a plurality of pieces of information other than the shared information as answer choices are generated.

  Further, a plurality of questions including one or a plurality of pieces of shared information registered by the checker terminal 10 that has requested access confirmation for the accessor 5 and any one or a plurality of pieces of information other than the shared information are generated as answer options. .

  Step 611) The alibi server 2 transmits each question generated in Step 610 to the accessor terminal 3.

  Step 612) The accessor terminal 3 transmits an answer to the related question of the confirmer 6 and an answer to the related question of the confirmer 15 to the alibi server 2.

  Step 613) The alibi server 2 receives the answer in Step 612.

  Step 614) The question control unit 28 of the alibi server 2 refers to the accessor list of the client DB 201 to determine whether the answer received from the accessor terminal 3 is correct or incorrect, and the result is sent to the client along with the answer date and time. Each record is recorded in the checker list for the accessor 5 in the DB 201.

  Step 615) The confirmer terminal 4 requests the alibi server 2 for access certification data of the accessor 5 of the confirmer terminal 4.

  Step 616) The alibi server 2 refers to the access record field of the accessor 5 of the client DB 201 and creates response information.

  Step 617) The alibi server 2 refers to the checker list for the accessor 5 of the client DB 201 and uses the access date and time, the connection IP address, and the answer rate and error for the question related to the checker 15 as the proof data of the accessor 5. The answer content is transmitted to the checker terminal 4.

  Step 618) The confirmer terminal 4 receives the certification data of Step 617.

  Step 619) Upon receiving the information from the checker terminal 4, the checker 6 checks the access status of the accessor 5. However, it is determined that the data is insufficient for the approval / disapproval of the alibi certificate, and an additional request is made to the alibi server 2 for the answer rate regarding the question related to the other confirmer 15.

  Step 620) The alibi server 2 creates response information (accessor's correct answer rate, question answer result, access time, IP address, location, etc.) from the accessor 5 list in the client DB 201.

  Step 621) Based on the account information of the accessor 5, the alibi server 2 refers to the checker list for the accessor 5 in the client DB 201 to obtain the response rate and the content of the incorrect answer to the checker 15's question, Proof data is created and transmitted to the checker terminal 4 as additional proof data of the accessor 5.

  Step 622) The confirmer terminal 4 receives the additional certification data transmitted in Step 621. As a result, the confirmer 6 confirms or rejects the alibi proof including the proof data by the confirmer 15.

[Fourth Embodiment]
In the present embodiment, a case will be described in which position information that is valid alibi proof is obtained using a satellite positioning system function.

  FIG. 18 shows a system configuration according to the fourth embodiment of the present invention.

  In the system shown in the figure, the accessor terminal 16 of the accessor 17 and the confirmer terminal 4 of the confirmer 6 are connected to the alibi server 18 via the communication network 1.

  FIG. 19 shows the configuration of an accessor terminal in the fourth embodiment of the present invention.

  The accessor terminal 16 includes a GPS terminal 161 that is a satellite positioning system function and a one-time password generation unit 162 in addition to the configuration of the accessor terminal of FIG.

  The configuration of the confirmer terminal 4 is the same as the configuration shown in FIG. 5, and a shared information registration unit that registers a plurality of shared information shared only with the accessor 17 together with the account of the accessor 17 requesting access confirmation in the alibi server 2 45. It has an input / output control unit 43 that receives and displays the account of the accessor 17 who operates the accessor terminal 16 from the alibi server 2, the contents of the answer to the question, the access date and time, and the current position information of the accessor terminal .

  The confirmer 6 determines that the operator of the accessor terminal that requested access confirmation based on the response rate, the response content, and the location information for the accessor terminal 3 received from the alibi server 2 is the accessor of the accessor terminal 16. If the accessor correctly requests access confirmation, the access date and time when the accessor terminal 16 accesses the alibi server 2 can be confirmed and displayed.

  The accessor terminal 16 uses the one-time password generated by the one-time password generation unit 162 as an authentication method that the accessor terminal operator 17 cannot know with the alibi server 2, for example, as a method that the accessor does not know. By embedding in the terminal 161 and having the password transmitted, the GPS terminal 161 is authenticated, and it is a one-time password even if a malicious accessor eavesdrops on the transmitted password. Therefore, there is no problem, and the accessor terminal 16 can be authenticated by the one-time password.

  The accessor terminal 16 transmits the location information of the current location obtained by the GPS terminal 161 together with the account and the answer to the question transmitted from the alibi server 2 to the alibi server 2, and the authentication unit 25 of the alibi server 2 The information sent from the accessor terminal 16 is confirmed after authenticating the accessor terminal 16 by an authentication method that cannot be known by the accessor 17 who is the operator of the accessor terminal. Thereby, the alibi server 2 receives the location information together with the account of the accessor terminal 16 and the answer to the question, and records them in the client DB 201. Here, the authentication method performed by the authentication unit 25 that the accesser cannot know is, for example, a method in which an account encrypted with a one-time password is incorporated in the accessor terminal 16 and read out.

  Step 701) In the count management unit 21 of the alibi server 2, the uniquely determined accounts of the accessor terminal 16 and the confirmer terminal 4 are read from the client DB 201, and the accessor terminal 3 and the confirmer are communicated via the communication unit 27. Transmit to terminal 4.

  Step 702) The account acquisition unit 31 of the accessor terminal 16 acquires the account transmitted from the alibi server 2 and stores it in the storage unit 34.

  Step 703) The account acquisition unit 41 of the confirmer terminal 4 acquires the account transmitted from the alibi server 2 and stores it in the storage unit 44.

  Step 704) The shared information registration unit 45 of the confirmer terminal 4 transmits a plurality of pieces of shared information shared only with the accessor 17 to the alibi server 2 together with the account of the accessor terminal 16 that requests access confirmation.

  Step 705) The access control unit 22 of the alibi server 2 acquires the shared information and registers the shared information in association with the accessor 17 in the accessor list for the confirmer 6 of the client DB 201.

  Step 706) Log in to the alibi server 2 from the accessor terminal 16 at the date and time when it is desired to prove that the accessor 17 has accessed.

  Step 707) The alibi server 2 records the account of the accessor terminal 16, the access date and time, and the route connection IP address in the client DB 201, and the confirmer 6 who requested access confirmation for the accessor 17 in the question creation unit 23 is registered. A plurality of questions including one or more pieces of shared information and any one or more pieces of information other than the shared information as answer choices are generated.

  Step 708) The alibi server 2 requests the accessor terminal 16 to generate a one-time password.

  Step 709) The one-time password generation unit 162 of the accessor terminal 16 generates a one-time password and transmits it to the alibi server 2.

  Step 710) The alibi server 2 receives the one-time password, temporarily holds it in the memory 204, and transmits a question to the accessor terminal 16.

  Step 711) The accessor terminal 16 transmits the answer to the question in Step 708, the GPS position information, and the one-time password to the alibi server 2.

  Step 712) The alibi server 2 receives the transmission data from the accessor terminal 16 located at Step 711. If the authentication unit 25 authenticates the accessor terminal 16 using a one-time password or the like, and the authentication is successful, the process proceeds to step 713, and if it fails, the process proceeds to step 711.

  Step 713) The question control unit 28 of the alibi server 2 determines whether the answer received from the accessor terminal 16 is correct or incorrect, records the result together with the answer date and position data in the client DB 201, and the accessor A registration completion notification is transmitted to the terminal 16.

  Step 714) The accessor terminal 16 receives the registration completion notification.

  Step 715) The confirmer terminal 4 requests access certification data of the accessor 17 from the alibi server 2.

  Step 716) The alibi server 2 searches the access record data of the accessor 17 from the accessor list of the confirmer 6 in the client DB 201 and creates response information.

  Step 717) The alibi server 2 transmits the access date / time, the connection IP address, the answer rate to the question, the content of the wrong answer, and the location information to the checker terminal 4 as the proof data of the accessor 17.

  Step 718) The confirmer terminal 4 receives the certification data in Step 716.

  Step 719) Upon receiving the information from the checker terminal 4, the checker 6 checks the access status of the accessor 17.

  Next, an alibi approval process in the present embodiment will be described.

  FIG. 21 is a diagram for explaining the alibi approval process in the fourth embodiment of the present invention.

  When the accessor terminal 16 transmits the confirmer's alibi approval request to the alibi server 2 (step 706), the access control unit 22 determines the access date / time / connection IP address after the account of the accessor 17 is authenticated. The data is recorded in the access record field of the client DB 201, and a question is generated in the question creation unit 23 (step 707). The alibi server 2 requests a one-time password from the accessor terminal 16 (step 708), and the one-time password generation unit 162 of the accessor terminal 16 generates a one-time password and transmits it to the alibi server 2 ( Step 709). The alibi server 2 receives the one-time password from the accessor terminal 16, stores it in the memory 204, and transmits a question to the accessor terminal 16 (step 710).

  The accessor terminal 16 performs the following processing with the alibi server 2 in the GPS terminal 161.

  Step 801) The GPS terminal 161 transmits a terminal authentication request to the alibi server 2 using the generated one-time password (terminal embedded type).

  Step 802) The alibi server 2 authenticates the GPS terminal 161 from the one-time password in the authentication unit 25.

  Step 803) The GPS terminal 161 acquires longitude and latitude position data and transmits them to the alibi server 2.

  The present invention is not limited to the above-described embodiment, and various modifications and applications can be made within the scope of the claims.

  The present invention is the business management of business trips in business, as a transportation service for busy moving businessmen, the service of dispatching servicemen and express goods to customers who have been certified as alibi, prevention of color business trips, or It can be used in various forms such as cheating prevention.

It is a figure for demonstrating the principle of this invention. It is a principle block diagram of this invention. It is a system configuration figure in a 1st embodiment of the present invention. It is a block diagram of the accessor terminal in the 1st Embodiment of this invention. It is a block diagram of the confirmer terminal in the 1st Embodiment of this invention. It is a block diagram of the alibi server in the 1st Embodiment of this invention. It is a sequence chart of the operation | movement in the 1st Embodiment of this invention. It is a sequence chart of the alibi server in the 1st Embodiment of this invention. It is a figure which shows the client field of client DB in the 1st Embodiment of this invention. It is an accessor list of client DB at the time of the question setting in the 1st Embodiment of this invention. It is a figure which shows the process at the time of preparation of the accessor list and the confirmer list in the 1st Embodiment of this invention. It is a figure for demonstrating the process at the time of the alibi confirmation in the 1st Embodiment of this invention. It is a system block diagram in the 2nd Embodiment of this invention. It is a block diagram of the alibi server in the 2nd Embodiment of this invention. It is a sequence chart of operation in a 2nd embodiment of the present invention. It is a system block diagram in the 3rd Embodiment of this invention. It is a sequence chart of operation in a 3rd embodiment of the present invention. It is a system block diagram in the 4th Embodiment of this invention. It is a block diagram of the accessor terminal in the 4th Embodiment of this invention. It is a sequence chart of operation in a 4th embodiment of the present invention. It is a figure for demonstrating the alibi approval process in the 4th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Communication network 2 Alibi server 3 Accessor terminal 4 Confirmer terminal 5 Accessor 6 Confirmer 8 Web / mail server 10 Confirmer terminal 15 Confirmer 16 Accessor terminal 17 Accessor 20 Alibi content transmission means 21 Account transmission means, account Management unit 22 Access information management unit, access control unit 23 Question creation unit, question creation unit 24 Session control unit 25 Authentication unit 26 Charging unit 27 Communication unit 28 Answer determination unit, question control unit 29 Shared information registration unit 31 Account owner and empty Unit 32 response means, communication unit 33 input / output control unit 34 storage unit 35 input / output unit 41 account acquisition unit 42 communication unit 43 input / output control unit 44 storage unit 45 shared information transmission unit, shared information registration unit 46 accessor determination unit, Determination unit 47 Input / output unit 51 Access transfer connection unit 161 GPS terminal 162 One Im password generation unit 201 client DB
202 Usage history storage unit 204 Memory

Claims (10)

An alibi certifying that the user is located at a certain time, which is composed of a communication network and one or more accessor terminals connected to the communication network, one or more verifier terminals, and an alibi server. An alibi proof method in a proof system,
The alibi server is
An account transmission step of transmitting the account uniquely given to each of the accessor terminal and the confirmer terminal to both;
The checker terminal is
Along with the account of the accessor requesting access confirmation, a shared information transmission step of transmitting shared information shared only with the accessor to the alibi server is performed.
The alibi server is
A registration step of registering the accessor account transmitted from the confirmer terminal, the shared information in an accessor list associated with the accessor in the client DB;
Upon receiving access from the accessor terminal, an accessor information storage step of storing the accessor terminal's account, access date and time, and connection IP address in an access recording area in the client DB;
A question creation step of creating at least one question including the shared information stored in the client DB and any one or more information other than the shared information as an answer option, and transmitting the answer choice to the access terminal; And
In the accessor terminal,
Performing an answer step of sending an answer selected by the accessor from the answer options of the question sent from the alibi server to the alibi server;
In the alibi server,
When the answer transmitted from the accessor terminal is included in the shared information, the answer is determined to be correct, and information including the determination result, date and time, location, and question / answer content is sent to the accessor in the client DB. An answer determination step to store in a corresponding checker list;
Information corresponding to the confirmer terminal that has made an access confirmation request from the confirmer list in the client DB, and information stored in the access recording area in the client DB are used as the alibi content as the confirmer terminal. Send to the alibi sending step, and
The checker terminal is
Based on the alibi content acquired from the alibi server, a verification step of determining whether the operator of the accessor terminal is an operator of the correct accessor terminal that requested access confirmation,
An alibi proof method characterized by performing. In the answering step, the accessor terminal
Along with the answer, send any Web or mail server connection information to the alibi server,
The alibi server is
The connection information specified by the accessor terminal is recorded only when the access from the accessor terminal is recorded in the access record field in the client DB and the response from the accessor terminal exceeds a certain correct answer rate. Connecting the access terminal with the Web or the mail server based on
The alibi proof method according to claim 1. When the verifier terminal authenticates an accessor including information from other verifier terminals after the verification step,
Sending a proof data request to an accessee to be authenticated by a terminal other than the confirmer terminal to the alibi server,
The alibi server is
In response to a question from one or more confirmer terminals other than the certification data requester, the content of the access terminal of the accessor to be authenticated is read from the client DB, and the confirmer of the certification data requester Send it to your device,
The confirmer terminal of the certification data request source is
A process for further determining whether or not the operator of the accessor terminal is an operator of the correct accessor terminal that has requested access confirmation, using one or more alibi contents transmitted from the alibi server. Item 3. The alibi certification method according to item 1 or 2. In the accessor terminal,
Authenticate with the alibi server by an authentication method that the operator of the accessor terminal cannot know,
When answering the question sent from the alibi server,
Using the satellite positioning system function provided in the access terminal, the location information of the current location acquired by the satellite positioning system function is concealed together with the answer to the question, and transmitted to the alibi server together with the answer. ,
The alibi server is
The alibi certification method according to claim 1, wherein the answer and the location information transmitted from the accessor terminal are transmitted to the confirmer terminal as the alibi content. An alibi certifying that the user is located at a certain time, which is composed of a communication network and one or more accessor terminals connected to the communication network, one or more verifier terminals, and an alibi server. A proof system,
The alibi server is
Account transmitting means for transmitting the account uniquely assigned to the accessor terminal and the confirmer terminal to both,
Shared information registration means for registering the accessor's account and shared information transmitted from the confirmer terminal in an accessor list associated with the accessor in the client DB;
When receiving access from the accessor terminal, access information management means for storing the accessor terminal's account, access date and time, and connection IP address in an access recording area in the client DB;
A question creating means for creating at least one question including the shared information stored in the client DB and any one or a plurality of information other than the shared information as an answer option, and transmitting the question to the access terminal;
An answer to the question is received from the accessor terminal, and when the answer is included in the shared information, the answer is determined to be correct, and the determination result and date / time, location, information including the question / answer contents are Answer determination means for storing in a checker list corresponding to the accessor in the client DB;
Information corresponding to the confirmer terminal that has made an access confirmation request from the confirmer list in the client DB, and information stored in the access recording area in the client DB are used as the alibi content as the confirmer terminal. An alibi content transmitting means for transmitting to,
Have
The checker terminal is
Shared information transmitting means for transmitting, to the alibi server, shared information shared only with the accessor together with an account of the accessor requesting access confirmation;
Accessor determination means for determining whether or not the operator of the accessor terminal is an operator of the correct accessor terminal that requested access confirmation based on the content of the alibi acquired from the alibi server. ,
The accessor terminal is
Reply means for sending an answer selected by an accessor from the answer options of the question sent from the alibi server to the alibi server;
An alibi proof system characterized by that. The answering means of the accessor terminal is:
Along with the answer, further comprising means for transmitting connection information of an arbitrary web or mail server to the alibi server,
The alibi server is
The access specified by the accessor terminal is recorded only when the access from the accessor terminal is recorded in the access record field in the client DB, and the response from the accessor terminal exceeds a certain correct answer rate. Further comprising means for connecting the access terminal with the Web or the mail server based on the information;
The alibi proof system according to claim 5. In the checker terminal, when authenticating an accessor including information from other checker terminals,
The checker terminal is
After performing the accessor determination means, means for requesting proof data for an accessee to be authenticated other than the terminal to the alibi server;
The one or more alibi contents transmitted from the alibi server further includes means for determining whether or not the operator of the accessor terminal is the correct operator of the accessor terminal that requested access confirmation. ,
The alibi server is
Means for receiving the proof data request;
In response to a question from one or more confirmer terminals other than the certification data requester, the content of the access terminal of the accessor to be authenticated is read from the client DB, and the confirmer of the certification data requester Means for sending to the terminal;
The alibi proof system according to claim 5 or 6, further comprising: In the accessor terminal,
Means for performing authentication with the alibi server by an authentication method that an operator of the access terminal cannot know;
A satellite positioning system device provided inside the accessor terminal;
When answering the question transmitted from the alibi server, the satellite positioning system device is used to conceal the location information of the current location acquired by the satellite positioning system function together with the answer to the question, Means for transmitting to the alibi server together with the answer;
The alibi server is
The alibi certification system according to claim 5, further comprising means for transmitting the answer and the position information transmitted from the accessor terminal to the confirmer terminal as the alibi content. A communication network and one or a plurality of accessor terminals connected to the communication network, one or a plurality of confirmer terminals, and the accessor of the accessor terminal at a certain time with respect to the confirmer terminal An alibi server in an alibi proof system that proves that it was located at a place,
Account transmitting means for transmitting the account uniquely assigned to the accessor terminal and the confirmer terminal to both,
Shared information registration means for registering the accessor's account and shared information transmitted from the confirmer terminal in an accessor list associated with the accessor in the client DB;
When receiving access from the accessor terminal, access information management means for storing the accessor terminal's account, access date and time, and connection IP address in an access recording area in the client DB;
A question creating means for creating at least one question including the shared information stored in the client DB and any one or a plurality of information other than the shared information as an answer option, and transmitting the question to the access terminal;
An answer to the question is received from the accessor terminal, and when the answer is included in the shared information, it is determined to be a correct answer, and information including the determination result, date and time, location, and question / answer contents is stored in the client DB. Answer determination means for storing in a checker list corresponding to the accessor in
Information corresponding to the confirmer terminal that has made an access confirmation request from the confirmer list in the client DB, and information stored in the access recording area in the client DB are used as the alibi content as the confirmer terminal. An alibi content transmitting means for transmitting to,
The alibi server characterized by having. On the computer,
10. An alibi proof program that causes each means of the alibi server according to claim 9 to be executed.

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