JP2007164306A - Location certification system, certification center device, location certification method, certification device and terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology of location certification for making it difficult to do something dishonest, and for increasing the accuracy of a location, regarding a terminal. <P>SOLUTION: A certification center device 300 is connected to a plurality of certification devices 20 installed in a predetermined area, and on the basis of the date and time of radio communication and the location of the certification device 20 received from the certification device 20 which has performed radio communication with the movable terminal 10, certifies that a terminal 10 has been present at the above location at the above date and time. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a technique for proving that a terminal device (hereinafter referred to as a terminal) carried by a pedestrian or mounted on a vehicle is present at a specific place at a specific date and time.

  2. Description of the Related Art Conventionally, as a technique for terminal location certification, for example, there is a technique that uses GPS (Global Positioning System). According to this, the terminal can identify its own position by receiving radio waves from a plurality of GPS satellites, and can store the position information and date / time information in association with each other to obtain terminal position certification. Can do.

Further, as another location certification technique related to the terminal, there is one disclosed in Patent Document 1. In the technique of Patent Document 1, the position of a mobile phone is specified by using the principle of triangulation in a mobile phone (terminal) and a plurality of base stations, and the position information and date / time information are associated and stored in a server. Thus, it can be used as location certification of the mobile phone.
JP 2003-284113 A

  However, the above-described location verification technology using GPS has a problem that false location verification can be easily performed by using a device called a GPS simulator that can transmit the same radio wave as a GPS satellite. .

  Further, the technique of Patent Document 1 has a problem that the accuracy related to the position of the terminal cannot be improved more than about 100 meters due to the accuracy of time at which radio waves are transmitted from the respective base stations.

  Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide terminal location certification that is difficult to be fraudulent and has high location accuracy.

In order to solve the above problems, a location certification system according to the present invention includes a movable terminal, a plurality of certification devices installed in a predetermined area, and a certification center device connected to the plurality of certification devices. And the certification center device proves that the terminal was in a specific position at a specific date and time.
For that purpose, when the terminal receives information requesting transmission of the terminal ID and certification request information that the certification device transmits to the vicinity thereof, the terminal ID is encrypted with a unique key unique to each terminal. The certification request information is transmitted to the certification device.
Further, when the certification device receives the terminal ID and the encrypted certification request information from the terminal, the certification device is an identifier of the certification device in the terminal ID and the encrypted certification request information The ID and the date and time when the terminal performed wireless communication with the certification device are added and transmitted to the certification center device.
Further, when the certification center device receives the terminal ID, the encrypted certification request information, the certification device ID, and the date and time from the certification device, the certification center device refers to the first DB. The encrypted certification request information is decrypted with the unique key corresponding to the terminal ID acquired in step (b) to authenticate the terminal, and the terminal ID, the certification device ID, and the date and time are used as certification information. Stored in the database.
Other means and methods will be described later.

  According to the present invention, it is possible to perform location verification of a terminal that is difficult to cheat and whose location accuracy is high.

Hereinafter, a location certification system according to an embodiment of the present invention will be described with reference to the drawings as appropriate. FIG. 1 is an overall configuration diagram of the location certification system.
The location certification system S includes a terminal 10, a certification device 20, and a certification center 30. The certification device 20 and the certification center 30 are connected by a communication line 40 such as the Internet.

  The terminal 10 is, for example, a mobile phone or an in-vehicle terminal device, and includes a security module (storage unit) 11, a personal authentication sensor unit 12, a main storage unit 13, a request receipt information storage unit 14, a wireless communication unit 15, and a display unit 16. The input unit 17 and the processing unit 18 are provided.

  The security module 11 is a storage device that has improved protection performance against unauthorized external data analysis (such as data reading). The security module 11 stores a terminal ID that is an identifier of the terminal 10 and a unique key that is unique to each terminal 10 and is used for encryption and decryption of information. Examples of the unique key include those using a common key cryptosystem, a public key cryptosystem, and the like.

The personal authentication sensor unit 12 is means for performing personal authentication of the operator of the terminal 10, and is, for example, a sensor that reads the fingerprint, iris, vein, etc. of the operator.
The main storage unit 13 stores an operation program of the processing unit 18 and various types of information, and includes, for example, a RAM (Random Access Memory), a ROM (Read Only Memory), a flash memory, and the like.

The request receipt information storage unit 14 stores request receipt information received from the certification device 20 and indicating that the communication between the terminal 10 and the certification device 20 has been normally performed. For example, a RAM, a flash memory, etc. Consists of
The wireless communication unit 15 is a device for performing wireless communication with the certification device 20 and the certification center 30.

The display unit 16 is a display device that displays position information and date / time information in response to a request from the processing unit 18, and details thereof will be described with reference to FIG.
The input unit 17 is used by the operator of the terminal 10 to input information and is, for example, an input button.
The processing unit 18 is connected to the security module 11 to the input unit 17 and performs various arithmetic processes, and is, for example, a CPU (Central Processing Unit).

  A plurality of certification devices 20 are installed at various locations in a predetermined area for the location certification of the terminal 10. The certification device 20 includes a wireless communication unit 21, a transmission / reception unit 22, a certification device ID storage unit 23, a main storage unit 24, and a processing unit 25.

The wireless communication unit 21 is a device for performing wireless communication with the terminal 10.
The transmission / reception unit 22 is a device for transmitting / receiving information to / from the certification center 30 via the communication line 40.

The proof device ID storage unit 23 stores a proof device ID that is an identifier for each proof device 20, and is, for example, a ROM.
The main storage unit 24 stores an operation program of the processing unit 25 and various types of information, and includes, for example, a RAM, a ROM, a flash memory, and the like.
The processing unit 25 is connected to the wireless communication unit 21 to the main storage unit 24 and performs various arithmetic processes, and is, for example, a CPU.

The certification center 30 is a facility for accumulating information received from the certification device 20 and includes a certification center device 300.
The certification center device 300 includes a transmission / reception unit 31, a main storage unit 32, a terminal ID / unique key DB (Data Base) (first DB) 33, a certification information DB (second DB) 34, a certification device DB (Data Base). ) 35, a request reception information DB 36, an output unit 37, a wireless communication unit 38, and a processing unit 39.

The transmission / reception unit 31 is a device for transmitting / receiving information to / from the certification device 20 via the communication line 40.
The main storage unit 32 stores an operation program of the processing unit 39 and various types of information, and includes, for example, a RAM, a ROM, a hard disk, and the like.

The terminal ID / unique key DB 33 stores the terminal ID and information of the unique key corresponding to the terminal 10 in association with each other.
The certification information DB 34 stores the date and time, the terminal ID, and the certification device ID in association with each other when the terminal 10 and the certification device 20 communicate with each other.
The certification device DB 35 stores the certification device ID and its installation location in association with each other with respect to the plurality of certification devices 20.
The request receipt information DB 36, when request receipt information is transmitted from the certification center device 300 to the terminal 10 via the communication line 40 and the certification device 20, the date and time, the terminal ID of the destination terminal 10 and the contents of the request receipt information. Are stored in association with each other.
The terminal ID / unique key DB 33 to request receipt information DB 36 are constituted by, for example, hard disks.

The output unit 37 displays or prints information processed by the processing unit 39, and is, for example, a CRT (Cathode Ray Tube) or a printer.
The wireless communication unit 38 is a device for performing wireless communication with the terminal 10.
The processing unit 39 is connected to the transmission / reception unit 31 to the wireless communication unit 38 and performs various arithmetic processes, and is, for example, a CPU.

Next, a display example of the display unit 16 of the terminal 10 will be described with reference to FIG. 2 (see FIG. 1 as appropriate). FIG. 2A is a display example of the display unit 16 when the terminal 10 receives request reception information from the certification device 20.
When the terminal 10 receives the request receipt information from the certification device 20, the display unit 16 of the terminal 10 identifies the terminal 10 at a specific date and time (displayed in the area indicated by reference numeral 161) as shown in FIG. The certification center 30 displays that the certification data indicating that the user has been in the location (displayed in the area indicated by reference numeral 162).

FIG. 2B is a display example of the display unit 16 when the operator uses the terminal 10 to request the certification center device 300 for location certification.
When the operator uses the terminal 10 to request the certification center device 300 of the certification center 30 for location certification, the operator operates the terminal 10 as follows according to the display on the display unit 16 as shown in FIG. To do.

  The operator first performs personal authentication with the personal authentication sensor unit 12 according to the instruction (1). If the result is satisfactory, the OK display 163 is lit. Next, according to the instruction (2), the operator uses the input unit 17 to input the date and time at which he / she wants to receive position certification in the area indicated by reference numeral 164. Subsequently, the operator operates the transmission button 165 using the input unit 17 in accordance with the instruction (3), whereby the request information for location certification is transmitted from the terminal 10 to the certification center device 300.

  FIG. 2C is a display example of the display unit 16 when the terminal 10 receives a location certificate from the certification center device 300. When the terminal 10 receives the location certificate from the certification center device 300, the display unit 16 of the terminal 10 displays the contents of the location certificate, that is, the terminal 10 has a specific date (code) as shown in FIG. (Displayed in the area indicated by 166) is displayed to indicate that the user is in a specific place (displayed in the area indicated by reference numeral 167).

Next, the installation status of the certification device 20 will be described with reference to FIG. 3 (see FIG. 1 as appropriate). FIG. 3 is a diagram showing the installation status of the certification device 20.
In the predetermined area A, six main roads 50 and general roads 60 other than the main roads 50 are provided. Illustrations of buildings and the like are omitted.

There are nine intersections between the main roads 50, and the certification device 20 is installed in the vicinity of each intersection. Each proving device 20 has a communication performance of such a degree that it can communicate with a terminal 10 possessed by a pedestrian or vehicle passing through the intersection, that is, a pedestrian (eg, about 10 meters).
The installation location of the certification device 20 is not limited to the intersection between the trunk roads 50, and can be any place such as a place other than the intersection on the trunk road 50, an intersection between the trunk road 50 and the general road 60, and the like. It is.

  Also, the distance between the certification devices 20 is, for example, long on a highway, short on a sidewalk, long on a local area, short on a city, etc. It may be set as appropriate in the range of several tens of meters to several tens of kilometers according to the above.

Next, the processing of each device in the location certification system S when the certification center device 300 stores certification information regarding the location of the terminal 10 will be described with reference to FIG. 4 (see FIGS. 1 and 3 as appropriate). FIG. 4 is a flowchart showing the flow of processing of each device at that time.
The wireless communication unit 21 of the proving device 20 installed at the intersection of the main road 50 receives a terminal ID so that the terminal 10 in the vicinity (for example, within a radius of 10 meters) can be received regularly (for example, every second). Information (signal) requesting transmission of certification request information is transmitted to the surroundings (step S401).

  In the terminal 10 possessed by the pedestrian or vehicle passing through the intersection of the main road 50, the wireless communication unit 15 receives the terminal ID and the certification request information transmission request information from the certification device 20. In response to this, the processing unit 18 of the terminal 10 encrypts the certification request information using the unique key stored in the security module 11 (step S403). The certification request information is information (signal) to be transmitted when the terminal 10 requests location certification from the certification center device 300. The format or content between the terminal 10 and the certification center device 300 in advance. Is determined information.

Subsequently, the processing unit 18 of the terminal 10 transmits the terminal ID stored in the security module 11 and the certification request information (encryption) created in step S403 to the certification device 20 via the wireless communication unit 15. (Step S404).
Note that step S403 and step S404 may be performed automatically by the terminal 10, or may be performed only when the operator operates the input unit 17.

  The processing unit 25 of the certification device 20 determines whether or not the terminal ID and certification request information (encryption) have been received from the terminal 10 (step S402), and if not received (No), returns to step S401, On the other hand, if it has been received (Yes), the process proceeds to step S405.

  In step S405, the processing unit 25 of the certification device 20 obtains the date / time (information), terminal ID, certification request information (encryption), and certification device ID stored in the certification device ID storage unit 23 at that time. The data is transmitted to the certification center device 300 via the transmission / reception unit 22 (step S405).

When the processing unit 39 of the certification center device 300 receives each piece of information transmitted by the certification device 20 in step S405 via the transmission / reception unit 31, the processing unit 39 searches the terminal ID / unique key DB 33 and identifies the unique information corresponding to the received terminal ID. A key is extracted (step S406).
Subsequently, the processing unit 39 decrypts the received certification request information (encrypted) with the extracted unique key (step S407), authenticates the terminal 10 (confirms the validity), and whether the authentication result is good or not. Is determined (step S408).

  When the authentication result of the terminal 10 is not good (No in step S408), the processing unit 39 ends the process. On the other hand, if the authentication result of the terminal 10 is good (Yes in step S408), the processing unit 39 accumulates (stores) the date and time, the terminal ID, and the authentication device ID as certification information in the certification information DB 34 (step S409). ).

  After step S409, the processing unit 39 encrypts (creates) the request reception information for the terminal 10 using the unique key corresponding to the terminal 10 stored in the terminal ID / unique key DB 33, and the proving apparatus 20 (Step S410). The request receipt information is information for notifying the terminal 10 that the certification center device 300 has received the certification request information from the terminal 10.

  The processing unit 25 of the certification device 20 transfers the request receipt information (encrypted) received from the certification center device 300 via the transmission / reception unit 22 to the terminal 10 via the wireless communication unit 21 (step S411).

The processing unit 18 of the terminal 10 decrypts the request receipt information (encrypted) received from the certification device 20 via the wireless communication unit 15 with the unique key stored in the security module 11 and displays it on the display unit 16. (See FIG. 2A), the decrypted request receipt information is stored in the request receipt information storage unit 14 (step S412).
Thereby, the operator can confirm that the location certification data (certification information) of the terminal 10 is accumulated in the certification center device 300 by looking at the display unit 16.

After step S410, the processing unit 39 of the certification center apparatus 300 accumulates the request receipt information log, that is, the date and time when the request receipt information is transmitted to the request receipt information DB 36, the target terminal ID, and the request receipt information. Is stored (stored) (step S413).
As described above, the certification request information transmitted from the terminal 10 in step S404 and the request reception information transmitted from the certification center apparatus 300 in step S410 are encrypted with the unique key for each terminal 10, so that the illegal data A high level of security against reception and tampering can be realized.

  Next, with reference to FIG. 5, a description will be given of those processes when the terminal 10 requests the certification center device 300 for location certification (see FIG. 1 as appropriate). FIG. 5 is a flowchart showing a processing flow of the terminal 10 and the certification center apparatus 300 at that time.

  When the operator of the terminal 10 wants to prove the position of the terminal 10 at a specific point in the past, first, the personal authentication sensor unit 12 of the terminal 10 is used according to the display on the display unit 16 (see FIG. 2B). Personal authentication. And the process part 18 of the terminal 10 judges whether the result of the personal authentication was favorable (step S51).

  If the result of personal authentication is not good (No in step S51), the processing unit 18 of the terminal 10 ends the process. On the other hand, if the result of personal authentication is good (Yes in step S51), the processing step 18 Proceed to S52.

Subsequently, according to the display on the display unit 16 (see FIG. 2B), the operator uses the input unit 17 to input the date and time (designated date and time) at which position verification is desired, and operates the send button 165.
Then, in step S52, the processing unit 18 of the terminal 10 displays the terminal ID stored in the security module 11, the request reception information (corresponding to the specified date) stored in the request reception information storage unit 14, and the specified date and time. The data is transmitted to the certification center device 300 via the wireless communication unit 15 to request location certification (step S52).

  The processing unit 39 of the certification center apparatus 300 receives the terminal ID, the request reception information, and the specified date and time transmitted by the terminal 10 via the wireless communication unit 38, and refers to the request reception information DB 36 to obtain the request reception information. Authentication (verification) is performed, and it is determined whether or not the authentication result is good (step S53).

  If the authentication result of the request receipt information is not good (No in step S53), the processing unit 39 ends the process. If the authentication result of the request receipt information is good (Yes in step S53), the processing unit 39 performs step S54. Proceed to

Next, the processing unit 39 searches the proof information DB 34 based on the terminal ID received from the terminal 10 and the specified date and time (step S54), and also refers to the proof device DB 35, so that the terminal of the terminal ID Creates a location certificate (certification information) for the location at the specified date and time (the location where the certification device 20 can be identified from the certification device DB 35), and transmits it to the terminal 10 via the wireless communication unit 38 (step S55). ).
In step S55, an electronic signature (signature information for guaranteeing the validity of digital data, such as a digital signature using a public key cryptosystem) may be added to the location certificate.

The processing unit 18 of the terminal 10 displays the location certificate received from the certification center device 300 via the wireless communication unit 15 on the display unit 16 (see FIG. 2C), and the location certificate is displayed in the main storage unit 13. (Step S56).
In this way, the operator can obtain a highly accurate position certificate of about 10 meters related to the terminal 10.

  In the flowchart of FIG. 5, the operator makes a request for location certification to the certification center device 300 using the terminal 10, but for example, whether the operator goes to the certification center 30. A request for location certification is made along with the designated date and time by making a telephone call, etc., and the staff of the certification center 30 operates the certification center device 300 to issue a location certification on a paper medium etc. You may make it pass to.

  As described above, according to the position certification system S of the present embodiment, communication is performed between the plurality of certification devices 20 installed in a predetermined area and the terminal 10 passing therearound, and the date and time of the communication and the certification device 20 By storing the location in the certification center device 300 and inquiring the certification center device 300 from the terminal 10 as necessary, it is possible to realize location certification for the terminal 10 that is difficult to cheat and has high location accuracy. it can.

  Further, in the flowchart of FIG. 4, transmission of request receipt information from the certification center device 300 to the terminal 10 (steps S410 to S413) is not necessarily an operation, and may be omitted. In that case, the flowchart of FIG. 5 may be dealt with as appropriate, such as not transmitting the request receipt information in step S52.

This is the end of the description of the embodiments, but the aspects of the present invention are not limited to these.
For example, the terminal may be provided with a GPS positioning function, and the reliability of positioning by GPS may be enhanced by position verification by the proving apparatus of the present invention. In addition, the specific configuration can be changed as appropriate without departing from the spirit of the present invention.

It is a whole block diagram of a position certification system. (A) is a display example of the display unit 16 when the terminal 10 receives the request receipt information, and (b) is a display example of the display unit 16 when the operator requests location certification using the terminal 10. (C) is a display example of the display unit 16 when the terminal 10 receives a location certificate. It is the figure which showed the installation condition of the certification | authentication apparatus. 4 is a flowchart showing a flow of processing when certification information relating to the position of a terminal 10 is stored in the certification center device 300. 10 is a flowchart showing a flow of processing when the terminal 10 requests the certification center device 300 for location certification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Terminal 13 Main memory | storage part 18 Processing part 20 Proof device 23 Proof device ID memory | storage part 30 Proof center 300 Proof center apparatus 33 Terminal ID and intrinsic | native key DB
34 Certification information DB
35 Proof device DB
36 Request receipt information DB
39 Processing section

Claims (11)

A movable terminal, a plurality of certification devices installed in a predetermined area, and a certification center device connected to the plurality of certification devices, wherein the terminal is in a specific position at a specific date and time A location certification system certified by the certification center device,
The terminal
When receiving the terminal ID (Identification) and the information requesting transmission of the certification request information, the certification device transmits the terminal ID and the certification request information encrypted with a unique key unique to each terminal. Sent to the proving device,
The proving device is
When receiving the terminal ID and the encrypted certification request information from the terminal, the terminal ID and the encrypted certification request information include a certification device ID that is an identifier of the certification device, and the terminal Add the date and time of wireless communication with the certification device, send to the certification center device,
The certification center device
When the terminal ID, the encrypted proof request information, the proof device ID, and the date / time are received from the proof device, the information obtained by referring to a first DB (Data Base) The encrypted certification request information is decrypted with the unique key corresponding to the terminal ID to authenticate the terminal, and the terminal ID, the certification device ID, and the date and time are stored as certification information in the second DB. A location verification system characterized by The location verification system according to claim 1, further comprising:
The certification center device
When at least the terminal ID and the specified date / time transmitted from the terminal based on the information input by the operator of the terminal are received, the second DB is searched based on them, and the terminal is set to a specific date / time. Create proof information that you were in a specific location, send it to the terminal,
The terminal
The location certification system, wherein the certification information received from the certification center device is stored. A certification center device that is connected to a plurality of certification devices installed in a predetermined area and proves that a movable terminal was at a specific position at a specific date and time,
A first DB that stores a terminal ID and a unique key for encryption stored in association with each terminal;
A second DB for storing certification information including a date and time when the terminal performs wireless communication with the certification device, the terminal ID of the terminal, and a certification device ID that is an identifier of the certification device;
A processing unit for performing various arithmetic processes,
The processor is
From the certification device that has received the certification request information encrypted with the terminal ID and the unique key from the terminal, the terminal ID, the encrypted certification request information, the date and time of wireless communication with the terminal, and Receiving the proof device ID of the proof device,
Search the first DB to identify a unique key corresponding to the terminal ID, decrypt the encrypted certification request information using the unique key, and authenticate the terminal,
The certification center device, wherein the terminal ID of the authenticated terminal, the date and time when wireless communication was performed with the terminal, and the certification device ID are stored in the certification device DB. The processor is
When the location certification request information including the terminal ID and the specified date / time is received from the terminal or input from the input unit of the certification center device,
Search the second DB based on the location certification request information, create location certification information including the location of the terminal at the specified date and time, send the location certification information to the terminal, or The certification center device according to claim 3, wherein the certification center device is displayed on a display unit of the certification center device. A location certification method by a certification center device that is connected to a plurality of certification devices installed in a predetermined area and proves that a movable terminal was at a specific location at a specific date and time,
The certification center device
A first DB that stores a terminal ID and a unique key for encryption stored in association with each terminal;
A second DB for storing certification information including a date and time when the terminal performs wireless communication with the certification device, the terminal ID of the terminal, and a certification device ID that is an identifier of the certification device;
A processing unit for performing various arithmetic processes,
The processor is
From the certification device that has received the certification request information encrypted with the terminal ID and the unique key from the terminal, the terminal ID, the encrypted certification request information, the date and time of wireless communication with the terminal, and Receiving the proof device ID of the proof device,
Search the first DB to identify a unique key corresponding to the terminal ID, decrypt the encrypted certification request information using the unique key, and authenticate the terminal,
The location certification method characterized by storing the terminal ID of the authenticated terminal, the date and time of wireless communication with the terminal, and the certification device ID in the certification device DB. The processor is
When the location certification request information including the terminal ID and the specified date / time is received from the terminal or input from the input unit of the certification center device,
Search the second DB based on the location certification request information, create location certification information including the location of the terminal at the specified date and time, send the location certification information to the terminal, or 6. The location certification method according to claim 5, wherein the location certification method is displayed on a display unit of the certification center device. A plurality of proof devices installed in a predetermined area, wirelessly communicating with a mobile terminal, and transmitting / receiving information to / from a proof center device that certifies that the terminal was at a specific location at a specific date and time,
A proof device ID storage unit for storing a proof device ID that is its own ID;
A wireless communication unit that wirelessly communicates with the terminal;
A transmission / reception unit for transmitting / receiving information to / from the certification center device;
A processing unit for performing various arithmetic processes,
The processor is
Via the wireless communication unit, to the range that can be received by the terminal in the vicinity of the certification device, to send information requesting the terminal ID and certification request information to the terminal,
When the terminal in the vicinity of the certification device receives the information and transmits the terminal ID and certification request information encrypted with a unique key for each terminal, the terminal ID and the encryption The proof device ID and the date and time when the terminal wirelessly communicated with the proof device are added to the proof request information, and the proof request information is transmitted to the proof center device storing the proof information via the transceiver. Proving device characterized by that. By performing wireless communication with a certification device that transmits information requesting transmission of a terminal ID and certification request information to a terminal existing in the vicinity, the terminal receives a specific date and time from the certification center device that receives information from the certification device. A device that proves that you were in a specific location,
A wireless communication unit that performs wireless communication with a plurality of the certification devices installed in a predetermined area;
A storage unit that stores a terminal ID, which is its own identifier, and a unique key unique to each terminal;
A processing unit for performing various arithmetic processes,
The processor is
In the vicinity of the certification device, when receiving information requesting transmission of the terminal ID and the certification request information from the certification device, it is encrypted with the terminal ID stored in the storage unit and the unique key A terminal characterized by transmitting certification request information to the certification device. The processor is
If the request receiving information is received from the certification center device, which is encrypted with the unique key of the terminal, informing that the certification data indicating that the terminal was in a specific position at a specific date and time is received, the encryption 9. The terminal according to claim 8, wherein the received request reception information is decrypted with a unique key stored in the storage unit and displayed on the display unit of the terminal. The processor is
Based on the information input by the operator of the terminal, at least the terminal ID and the specified date / time are transmitted to the certification center device, and proof that the terminal received from the certification center device is in a specific position at a specific date / time. The terminal according to claim 9, wherein information is stored in the storage unit. The terminal according to claim 10, wherein
And a personal authentication sensor unit for receiving personal authentication information of the operator of the terminal,
The processing unit transmits at least the terminal ID and a specified date and time to the certification center device when valid personal authentication information is input from the personal authentication sensor unit.

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