JP2014109986A - Utilization method of electronic coupon and utilization system of electronic coupon - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a utilization method of an electronic coupon capable of simply performing authentication operation for preventing the electronic coupon from being altered and reducing operation load on a client.SOLUTION: The utilization method includes: a step in which a client side portable terminal 2 generates a one-time password (OTP) based on coupon identification information on an electronic coupon and displays an encryption code obtained by encrypting the generated OTP; a step in which a shop side portable terminal 4 reads the encryption code and transmits the code to a server 6 on a head office side; and a step for comparing the coupon identification information on the electronic coupon with stored coupon identification information on the electronic coupon and compares the OTP generated on the basis of the coupon identification information with the OTP from the client side portable terminal 2, thereby authenticating the electronic coupon.

Description

  The present invention relates to a method and system for using an electronic coupon distributed via a communication network.

  Electronic coupons have been issued in order to discount meal prices, product prices, etc., and to provide specific menus and services via the Internet. This electronic coupon is received by a client-side terminal such as a smartphone or iPhone (registered trademark), and is a system for receiving a predetermined service by downloading the received electronic coupon and displaying it on the client-side terminal (Patent Literature). 1 and 2).

  The electronic coupon system described in Patent Document 1 is the latest when a client-side terminal such as a personal computer requests distribution of an electronic coupon from a server via the Internet, and the expiration date of the distributed electronic coupon has expired. This is a system for requesting delivery of an electronic coupon. As a result, the latest electronic coupon can be used in the store.

  The electronic coupon system described in Patent Document 2 is a system that generates a one-time password (OTP) when issuing an electronic coupon to a client-side terminal, and displays the electronic coupon and OTP as a barcode on the client-side terminal. It is. Security is provided by using OTP.

Japanese Patent Laid-Open No. 2003-6499 JP 2009-123013 A

  However, the system described in Patent Document 1 has a problem that the reliability of the security of the electronic coupon is low and the electronic coupon is likely to be stolen. In the system described in Patent Document 2, the security of the electronic coupon is given to some extent, but the electronic coupon may be altered and used. Therefore, in any patent document, it is necessary to authenticate whether or not the electronic coupon displayed by the client-side terminal is valid. For authentication that prevents falsification of the electronic coupon, the operation for authentication becomes complicated. In addition, for authentication of the electronic coupon, since an operation at the client side terminal that has acquired the electronic coupon is required, there is a problem that the burden on the operation increases for the client, which is troublesome.

  The present invention has been made in consideration of such problems, and can easily perform an authentication operation for preventing falsification of an electronic coupon and can reduce an operation burden on a client. An object is to provide an electronic coupon usage method and an electronic coupon usage system.

  The method for using an electronic coupon of the present invention is such that a client-side mobile terminal obtains a one-time password (OTP) based on the coupon identification information of the acquired electronic coupon when the client-side mobile terminal acquires an electronic coupon via a network. A step of generating and displaying an encrypted code obtained by encrypting the generated OTP, a step of reading the encrypted code displayed on the client side portable terminal by the store side portable terminal and transmitting it to the headquarter side server, and a server on the headquarter side Decodes the encryption code, compares the decoded coupon identification information of the electronic coupon with the coupon identification information of the electronic coupon stored in the server, and generates and generates an OTP based on the coupon identification information of the electronic coupon. Client-side mobile end that sent the OTP via the store-side mobile terminal The step of authenticating the electronic coupon in comparison with the OTP from, and when the headquarters server authenticates the electronic coupon, the coupon information of the stored electronic coupon is updated based on the coupon information of the client-side mobile terminal And a step of transmitting the authentication result to the store side portable terminal.

  In the above method, the client-side mobile terminal records a plurality of electronic coupons, selects one electronic coupon from the plurality of recorded electronic coupons, and generates an OTP based on the coupon identification information of the selected electronic coupon. It is preferable.

  The electronic coupon utilization system of the present invention enables the use of an electronic coupon by a client-side mobile terminal acquiring an electronic coupon issued by a store via a network, and a server on the headquarters side authenticating the electronic coupon. A system for using an electronic coupon, wherein the client-side mobile terminal generates a one-time password (OTP) based on the coupon identification information of the electronic coupon, the coupon identification information, and the generated OTP The store includes a store-side mobile terminal, and the store-side mobile terminal is connected to the client-side mobile terminal. A reading unit for reading the encryption code displayed on the display unit; A transmission / reception unit capable of transmission / reception via a network, and the server on the headquarters side is capable of transmission / reception via the store-side portable terminal and a network, and coupon identification information of an electronic coupon issued by the store And the database which stored coupon information corresponding to a store, the decoding part which decodes the encryption code from a store side portable terminal into coupon identification information and OTP, and server side OTP which generates OTP based on the coupon identification information The generation unit compares the decoded coupon identification information with the coupon identification information stored in the database, and transmits the OTP generated by the server-side OTP generation unit and the store-side portable terminal and decodes the decoding unit. A coupon authentication unit that compares the OTP and authenticates the electronic coupon. When the coupon authentication unit authenticates the electronic coupon, the coupon information of the electronic coupon in the database is updated based on the coupon information of the electronic coupon from the store-side mobile terminal, and the authentication result is transmitted to the store-side mobile terminal. It is characterized by that.

  In the electronic coupon usage system, the client-side mobile terminal further includes a recording unit that records a plurality of electronic coupons, and a selection unit that selects one electronic coupon from the plurality of electronic coupons recorded by the recording unit. It is preferable.

  According to the present invention, since the OTP based on the coupon identification information and the coupon identification information of the electronic coupon is used in the authentication of the electronic coupon, the security is improved and the electronic coupon can be reliably prevented from being falsified. Moreover, since the store-side mobile terminal reads the encryption code displayed on the client-side mobile terminal and transmits it to the server on the headquarters side, the electronic coupon is authenticated, so the operation burden on the client can be greatly reduced. .

It is a block diagram which shows the utilization system of the electronic coupon in one Embodiment of this invention. It is a block diagram which shows the detail of the utilization system of an electronic coupon. It is a figure which shows the sequence for utilizing an electronic coupon. It is a front view which shows the state which the client side portable terminal displayed the some electronic coupon. It is a front view which shows the state which the client side portable terminal displayed the one electronic coupon. It is a front view which shows the state which the client side portable terminal displayed the encryption code. It is a front view which shows the state which the shop side portable terminal displayed the encryption code. It is a front view which shows the example of a display of the authentication result in a shop side mobile terminal.

  Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments. FIG. 1 is a block diagram showing an overall configuration of an electronic coupon utilization system 1 according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a main part of FIG.

  In the electronic coupon usage system 1 shown in FIG. 1, the client-side mobile terminal 2 is held and held by a customer. Electronic coupons are issued by stores. The store has a store computer 5 and a store-side mobile terminal 4 that can be connected to the store computer 5. The store computer 5 is connected to the head office server 6 so as to be accessible. This connection is made by the dedicated communication line 8 or the network 3. The store-side mobile terminal 4 is possessed by a store clerk, and the store-side mobile terminal 4 is connected to the headquarter-side server 6 via the network 3 when authenticating the electronic coupon.

  The electronic coupon is mutually accessed between the store computer 5 and the server 6 on the head office side. The electronic coupon is also accessed between the store computer 5 and the store-side mobile terminal 4. Through these accesses, information on rewriting, addition, and updating of the electronic coupon is shared among the store computer 5, the headquarter-side server 6, and the store-side mobile terminal 4. The store computer 5 may be omitted, and in this case, the store-side mobile terminal 4 is connected to the headquarter-side server 6 via the communication line 8.

  The client-side portable terminal 2 is a portable terminal owned by a customer, and a smartphone, an iPhone, a tablet (all are registered trademarks), and other portable terminals can be used. When using an electronic coupon in this embodiment, the customer goes to the store with the client-side mobile terminal 2 and presents it to the store clerk, so that the use of the electronic coupon is started.

  As shown in FIG. 2, the client-side mobile terminal 2 includes a transmission / reception unit 21, a reading unit 22, a recording unit 23, a selection unit 24, a display unit 25, a control unit 26, a client-side OTP generation unit 27, a timer 28, and an encoding unit 29. have.

The transmission / reception unit 21 performs communication with the server 6 on the headquarters side and other portable terminals 2 and other communication via the network 3.
The reading unit 22 is formed by a CCD camera or the like, and has the same function as a general camera.

  The recording unit 23 records a plurality of electronic coupons received by the transmission / reception unit 21. When the recording unit 23 records a plurality of electronic coupons, the customer can select one necessary electronic coupon. The selection unit 24 performs this selection. This selection can be performed by touching one selection column from the selection columns 81a to 81h displayed on the display unit 25 (see FIG. 4). Accordingly, the selection columns 81a to 81h form the selection unit 24.

  The display unit 25 includes a touch panel and a liquid crystal panel, and displays an electronic coupon acquired via the network 3. When the recording unit 23 records a plurality of electronic coupons, the display unit 25 displays a list of the plurality of electronic coupons (see FIG. 4). The display unit 25 displays an encryption code obtained by encrypting the coupon identification information and the OTP as will be described later. The displayed encryption code is read by the store side portable terminal 4. As the encryption code, a matrix type two-dimensional code (QR code (registered trademark)) can be used (see FIG. 6).

The client-side OTP generation unit 27 generates an OTP based on coupon identification information such as a coupon ID of one electronic coupon selected by the selection unit 24. The client-side OTP generation unit 27 generates an OTP that is a random number from a combination of coupon identification information and a password generation time by a predetermined algorithm. The generated OTP is a single-use type and is updated every time it is used.
The timer 28 measures the time and outputs the measured time to the client side OTP generation unit 27. As a result, the client-side OTP generation unit 27 generates an OTP in which the coupon identification information and the time are combined.

  The encoding unit 29 encodes information including the coupon identification information of the electronic coupon recorded in the recording unit 23 and the OTP generated by the client-side OTP generation unit 27 to generate an encryption code. The generated encryption code is displayed on the display unit 25 (see FIG. 6).

  The control unit 26 performs communication by the transmission / reception unit 21, reading by the reading unit 22, recording an electronic coupon in the recording unit 23, display by the display unit 25, generation of OTP by the client-side OTP generation unit 27, and encryption code generation by the encoding unit 29. Control generation and other driving.

  The store-side portable terminal 4 is a portable terminal that can be carried by a store clerk, and similarly to the client-side portable terminal 2, a smartphone, an iphon, a tablet (all are registered trademarks), and other portable terminals are used. Since the store-side portable terminal 4 is portable in this way, the client-side portable terminal 2 possessed by the customer can be easily read when using the electronic coupon.

  The store side portable terminal 4 includes a reading unit 41, a transmission / reception unit 42, a display unit 43, and a control unit 44.

The reading unit 41 includes a CCD camera or the like, and has the same function as a general camera. The reading unit 41 reads the encryption code displayed on the display unit 25 of the client side portable terminal 2.
The transmission / reception unit 42 performs communication with the server on the headquarters side and the other mobile terminals 4 via the network 3 and other communications.

  The display unit 43 includes a touch panel and a liquid crystal panel, and performs a predetermined display. In this embodiment, the display unit 43 displays the encryption code read by the reading unit 41 (see FIG. 7). Moreover, the display part 43 displays the authentication result of the electronic coupon transmitted from the server 6 on the headquarter side (see FIG. 8). When the display unit 43 displays the authentication result of the electronic coupon, an electronic coupon service is provided by a store clerk who has the store-side mobile terminal 4.

  The control unit 44 controls reading of the reading unit 41, communication by the transmission / reception unit 42, display by the display unit 43, and other driving of the store-side portable terminal 4.

  The server 6 on the headquarter side includes a transmission / reception unit 61, a server-side OTP generation unit 62, a timer 63, a store authentication unit 64, a coupon authentication unit 60, a display unit 65, an input unit 66, an output unit 67, a decoding unit 68, and a control unit 69. And a database 70.

  The transmission / reception unit 61 communicates with the store-side portable terminal 4 via the network 3. The transmission / reception unit 61 communicates with the store computer 5 via the dedicated communication line 8 or the network 3, and can communicate with the client-side portable terminal 2 via the network 3. The transmitter / receiver 61 communicates with the store computer 5 or the store-side mobile terminal 4 to input an electronic coupon issued by the store to the server 6. This electronic coupon is recorded in the database 70 (coupon database 72) of the server 6 as coupon information of the electronic coupon. Further, the transmission / reception unit 61 receives the electronic coupon transmitted from the store-side portable terminal 4. The coupon information of the electronic coupon received from the store-side portable terminal 4 is input to the coupon authentication unit 60, and the electronic coupon is authenticated.

  The input unit 66 includes a keyboard or the like and inputs predetermined data. The output unit 67 includes a printer or the like and outputs predetermined data. The display unit 65 performs a predetermined display such as a store or electronic coupon authentication result.

  The decoding unit 68 restores the encryption code (QR code (registered trademark)) of the client-side mobile terminal 2 transmitted from the store-side mobile terminal 4 and decodes it into coupon identification information and OTP. The decoding unit 68 separates the decoded coupon identification information and the OTP, outputs the coupon identification information to the server-side OTP generation unit 62, and outputs the OTP to the coupon authentication unit 60.

  The server-side OTP generation unit 62 generates an OTP based on the coupon identification information, and has OTP generation software like the client-side OTP generation unit 27. The server-side OTP generation unit 62 and the client-side OTP generation unit 27 generate OTP with the same algorithm, and for this reason, they have common OTP generation software. The server-side OTP generation unit 62 also generates an OTP that is a random number from a combination of the coupon identification information and the password generation time by a predetermined algorithm. The generated OTP is a single-use type and is updated for each use.

  The server-side OTP generation unit 62 generates an OTP based on the coupon identification information decoded by inputting the encryption code from the store-side portable terminal 4. This OTP is generated when an encryption code is input from the store side portable terminal 4. Not only this but the server side OTP production | generation part 62 may produce | generate OTP based on the coupon identification information stored in the coupon database 71 of the database 70. FIG. Even in this case, an OTP is generated when an encryption code is input from the store-side portable terminal 4. In any case, the generated OTP is output to the coupon authentication unit 60, and the coupon authentication unit 60 compares the OTP from the client-side mobile terminal 2 input from the store-side mobile terminal 4 to authenticate the electronic coupon. Is called.

  The timer 63 measures the time when the transmission / reception unit 61 receives the encrypted data from the store-side portable terminal 4 and outputs the measured time to the server-side OTP generation unit 62. The server-side OTP generation unit 62 generates an OTP based on the input time and coupon identification information.

The database 70 has at least a coupon database 71 and a store database 72.
The coupon database 71 stores coupon identification information and coupon information of an electronic coupon issued by the store computer 5 or the store-side mobile terminal 4. The coupon identification information is a coupon ID, a password, etc., and is data for identification with other electronic coupons. The coupon information of the electronic coupon includes service items such as products and meals to be serviced, service contents such as discount rate and discount rate corresponding to each service object, validity period, and other information. The coupon information is classified for each coupon identification information and stored in the coupon database 71.

  The store database 72 stores information on stores such as restaurants and merchandise stores. The store information is classified into store identification information such as a store ID for identifying the store and stored in the store database 72. The coupon identification information in the coupon database 71 is stored in association with the store ID of the store database 72. When one store is selected from the store database 72, the electronic coupon issued by the store is coupon-identified. Retrieved based on information.

  The information in the coupon database 71 and the store database 72 is updated so as to be the latest information by addition / deletion / correction or the like, and the update is performed by the control unit 69.

  The coupon authentication unit 60 authenticates the electronic coupon by comparing the coupon identification information transmitted from the store-side mobile terminal 4 and decoded by the decoding unit 68 with the coupon identification information stored in the coupon database 71. In addition to the authentication of the coupon identification information, the coupon authentication unit 60 compares the OTP generated by the server-side OTP generation unit 62 with the OTP transmitted from the store-side portable terminal 4 and decoded by the decoding unit 68. Authenticate the electronic coupon. Thus, not only the coupon authentication unit 60 compares the coupon identification information, but also compares the OTP based on the coupon identification information to authenticate the electronic coupon, thereby improving the security of the electronic coupon.

  In this embodiment, as described above, the comparison of the OTP in the coupon authentication unit 60 is stored in the coupon database 71 of the OTP or the database 70 based on the coupon identification information input from the store side portable terminal 4 and decoded. It is performed using OTP based on the coupon identification information, and authentication of the electronic coupon is performed by comparison of this OTP. Since these OTPs are updated as time passes, the security of the electronic coupon can be improved by comparing the OTP in addition to the comparison of the coupon identification information.

  Since the OTP is updated with the passage of time, it is necessary to match the date and time generated in the OTP comparison, but it may be difficult for the coupon authentication unit 60 to match the date and time when the OTP is generated. is there. In this embodiment, the coupon authentication unit 60 sets a certain range of valid time for the OTP generated by the server-side OTP generation unit 62. For example, an effective time of 2 to 3 minutes before and after the comparison time is set. If it is determined that the authentication is successful when the OTPs are equal within the valid time, the authentication can be performed even if there is a slight time lag in OTP generation.

  The store authentication unit 64 authenticates the store based on the coupon identification information of the electronic coupon transmitted from the store side portable terminal 4. This authentication is performed based on whether or not a store corresponding to the coupon identification information from the store-side mobile terminal 4 exists in the store database 72. If the store corresponding to the coupon identification information is stored in the store database 72, the store is authenticated, and if not stored, the store authentication and the electronic coupon authentication are rejected. The store authentication unit 64 is not an essential requirement and can be omitted.

  The control unit 69 controls driving of the coupon authentication unit 60, the transmission / reception unit 61, the server-side OTP generation unit 62, the decoding unit 68, the input unit 66, the output unit 67, the display unit 65, and the store authentication unit 64. The information of the coupon database 71 and the store database 72 is pulled out and written.

  Next, a usage sequence according to this embodiment will be described with reference to FIG.

  Prior to the use of the electronic coupon, the store (the store-side mobile terminal 4 or the store computer 5) issues an electronic coupon (step S1). The issued electronic coupon is transmitted to the server 6 on the headquarters side, and the coupon identification information and the corresponding coupon information are stored in the coupon database 71 of the server 6 (step S2). When there are a plurality of stores, the coupon identification information and the coupon information are stored according to each store.

  In step S <b> 3, the client-side portable terminal 2 acquires an electronic coupon via the network 3. The acquired electronic coupon is recorded in the recording part 23 of the client side portable terminal 2 (step S4). When the client-side portable terminal 2 acquires a plurality of electronic coupons, the recording unit 23 of the client-side portable terminal 2 records the plurality of electronic coupons in association with the issued store.

  When a customer uses an electronic coupon, the customer selects a necessary electronic coupon from a plurality of electronic coupons recorded in the client-side mobile terminal 2 (step S5). FIG. 4 shows a display example of the display unit 25 in the client-side portable terminal 2 when a plurality of electronic coupons are acquired and recorded. The electronic coupon (selection field) 81a is a coupon of “CD 500 yen discount coupon”, and the electronic coupon 81b is a coupon of “ramen 300 yen discount coupon”. In step S5, the customer touches and selects the display portion of the necessary electronic coupon for the display on the display unit 25. In this mobile phone, the electronic coupon (selection field) 81b is touched in order to select the electronic coupon 81b of the “ramen 300 yen discount coupon”.

  When the electronic coupon 81b is selected, the client-side OTP generation unit 27 of the client-side portable terminal 2 generates an OTP based on the coupon identification information of the electronic coupon 81b. After generating the OTP, the encoding unit 29 of the client-side mobile terminal 2 encrypts the coupon identification information and the OTP of the electronic coupon 81b to generate an encryption code (QR code (registered trademark)) (step S6).

  The client-side mobile terminal 2 displays the generated encryption code on the display unit 25 (step S7). FIG. 6 shows this display example, and the encryption code 85 is displayed on the display unit 25 together with the valid period 86 of the OTP. The store clerk uses the store side portable terminal 4 to read the encryption code 85 by the reading unit 41 of the terminal 4 (step S8). After reading the encryption code 85, the encryption code 85 is transmitted from the store-side portable terminal 4 to the head office server 6.

  In the server 6, upon receiving the encryption code, the decoding unit 68 decodes the encryption code (step S9) and separates it into coupon identification information and OTP. And the server side OTP production | generation part 62 of the server 6 produces | generates OTP based on coupon identification information (step S10). This OTP is generated based on coupon identification information decoded by inputting an encryption code from the store side portable terminal 4. Alternatively, it is generated based on coupon identification information stored in the coupon database 71 of the database 70.

  Thereafter, the coupon authentication unit 60 of the server 6 authenticates the electronic coupon. This authentication is performed by comparing coupon identification information (step S11) and comparing OTP (step S12). The comparison in step S11 is the coupon identification information transmitted from the store side portable terminal 4 and decoded by the decoding unit 68 (that is, the coupon identification information from the client side portable terminal 2) and the coupon identification information stored in the coupon database 71. This is done by comparing When the coupon identification information matches, the coupon authentication unit 60 compares the OTP decoded by the decoding unit 68 with the OTP generated by the server side OTP generation unit 62.

  When both the coupon identification information and the OTP match, the coupon authentication unit 60 authenticates that the coupon is a legitimate electronic coupon, and authenticates that the coupon is not a legitimate electronic coupon when either does not match (step S13). In addition, after authenticating that it is a regular electronic coupon, the store authentication by the store authentication unit 64 is appropriately performed.

  When it authenticates that it is a regular electronic coupon, the control part 69 updates the coupon information stored in the coupon database 71 (step S14). This update information is transmitted and received as the authentication result to the store side portable terminal 4 (step S15). FIG. 8 is a display example of the authentication result in the store-side portable terminal 4, and the store name 91, the result display 92, and the service content 93 are displayed in parallel. The store clerk can permit the use of the electronic coupon at the store by looking at the result display.

  According to such an embodiment, since the OTP based on the coupon identification information of the electronic coupon and the coupon identification information is used when authenticating the electronic coupon, the security is improved and the electronic coupon is prevented from being falsified with certainty. Can do. This makes it possible to use a reliable electronic coupon. In addition, since the store side mobile terminal 4 reads the encryption code displayed on the client side mobile terminal 2 and transmits it to the server 6 on the headquarters side, the electronic coupon is authenticated. The operation burden can be greatly reduced. Furthermore, since both the store-side mobile terminal 4 and the client-side mobile terminal 2 used for authentication are portable terminals, the degree of freedom of the authentication location and the authentication timing is expanded, and authentication becomes easy.

  In the said embodiment, although the server 6 is provided with the store authentication part 64 in addition to the coupon authentication part 60, this invention can abbreviate | omit the store authentication part 64. For example, when one store issues one electronic coupon, the store authentication unit 64 in FIG. 2 becomes unnecessary because the store coupon is specified by the authentication of the electronic coupon. Even in this case, it is possible to use an electronic coupon with improved security.

  In the said embodiment, although the client side portable terminal 2 has acquired the some electronic coupon, in this invention, when the client side portable terminal 2 acquires a single electronic coupon, it can apply similarly. . In this case, the list display of the electronic coupon shown in FIG. 4 becomes unnecessary, and the selection thereof becomes unnecessary, and the display shifts directly to the display of the electronic coupon shown in FIG.

DESCRIPTION OF SYMBOLS 1 Electronic coupon utilization system 2 Client side portable terminal 3 Network 4 Store side portable terminal 5 Store computer 6 Headquarter side server 23 Recording unit 24 Selection unit 25 Display unit 27 Client side OTP generation unit 29 Encoding unit 41 Reading unit 60 Coupon authentication Unit 61 Transmission / reception unit 62 Server-side OTP generation unit 68 Decoding unit 70 Database 71 Coupon database

Claims (4)

A client-side mobile device obtains an electronic coupon via a network;
The client-side mobile terminal generates a one-time password (OTP) based on the coupon identification information of the acquired electronic coupon, and displays an encrypted code obtained by encrypting the generated OTP;
The store-side mobile terminal reads the encryption code displayed on the client-side mobile terminal and transmits it to the headquarters-side server;
The server on the headquarters side decodes the encrypted code, compares the coupon identification information of the decoded electronic coupon with the coupon identification information of the electronic coupon stored in the server, and performs OTP based on the coupon identification information of the electronic coupon. Generating and authenticating the electronic coupon by comparing the generated OTP with the OTP from the client-side mobile terminal transmitted via the store-side mobile terminal;
When the server on the headquarters side authenticates the electronic coupon, the coupon information of the stored electronic coupon is updated based on the coupon information of the client side mobile terminal, and the authentication result is transmitted to the store side mobile terminal. A method of using an electronic coupon characterized by comprising:   The client-side mobile terminal records a plurality of electronic coupons, selects one electronic coupon from the plurality of recorded electronic coupons, and generates an OTP based on coupon identification information of the selected electronic coupon. The use method of the electronic coupon of Claim 1. An electronic coupon usage system that allows an electronic coupon issued by a store to be obtained via a network by a client-side mobile terminal, and the headquarters server authenticates the electronic coupon, thereby enabling the use of the electronic coupon.
The client-side mobile terminal generates a one-time password (OTP) based on coupon identification information of the electronic coupon, and generates an encryption code by encrypting the coupon identification information and the generated OTP. An encoding unit and a display unit for displaying the generated encryption code;
The store has a store-side mobile terminal, and the store-side mobile terminal transmits and receives via a network a reader that reads an encryption code displayed on the display unit of the client-side mobile terminal, and a server on the headquarters side A transmission / reception unit capable of
The server on the headquarters side is a transmission / reception unit capable of transmitting and receiving via the store-side mobile terminal, a database storing coupon identification information and coupon information of electronic coupons issued by the store corresponding to the store, A decoding unit that decodes the encryption code from the store-side mobile terminal into coupon identification information and OTP, a server-side OTP generation unit that generates OTP based on the coupon identification information, the decoded coupon identification information, and the database are stored Coupon authentication for authenticating an electronic coupon by comparing OTP generated by the server-side OTP generation unit and OTP transmitted via the store-side mobile terminal and decoded by the decoding unit Department and
When the coupon authentication unit authenticates the electronic coupon, the coupon information of the electronic coupon in the database is updated based on the coupon information of the electronic coupon from the store-side mobile terminal, and the authentication result is transmitted to the store-side mobile terminal. A system for using electronic coupons.   The client-side mobile terminal further includes a recording unit that records a plurality of electronic coupons, and a selection unit that selects one electronic coupon from the plurality of electronic coupons recorded by the recording unit. 3. The electronic coupon usage system according to 3.

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