KR20000012607A - certification system using radio communication device - Google Patents
certification system using radio communication device Download PDFInfo
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- KR20000012607A KR20000012607A KR1019990057586A KR19990057586A KR20000012607A KR 20000012607 A KR20000012607 A KR 20000012607A KR 1019990057586 A KR1019990057586 A KR 1019990057586A KR 19990057586 A KR19990057586 A KR 19990057586A KR 20000012607 A KR20000012607 A KR 20000012607A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/32—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials
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- G—PHYSICS
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- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q20/00—Payment architectures, schemes or protocols
- G06Q20/38—Payment protocols; Details thereof
- G06Q20/40—Authorisation, e.g. identification of payer or payee, verification of customer or shop credentials; Review and approval of payers, e.g. check credit lines or negative lists
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Abstract
본 발명은 고객이 항상 휴대하는 무선통신단말기를 이용하여 고객의 신원을 확인할 수 있도록 된 새로운 개념의 무선단말기를 이용한 인증시스템에 관한 것이다.The present invention relates to an authentication system using a wireless terminal of a new concept that enables a customer to check the identity of a customer using a wireless communication terminal that is always carried by the customer.
본 발명에 따르면, 각 고객소유의 무선단말기(2)와, 각 고객의 ID 및 무선단말기(2)의 번호가 기록된 데이터베이스(4)가 구축되며 무선통신을 이용하여 상기 무선단말기(2)에 데이터를 송신할 수 있도록 된 서버(6)와, 유,무선통신 또는 인터넷을 통해 상기 서버(6)와 연결되어 고객의 ID와 인증키를 입력할 수 있도록 된 입력수단(8)을 포함하여 구성되며, 고객이 상기 입력수단(8)을 이용하여 자신의 ID를 입력하면, 서버(6)는 임의의 인증키를 결정하여 이를 ID에 해당되는 고객의 무선단말기(2)에 전송하고, 고객이 상기 입력수단(8)을 통해 자신의 무선단말기(2)에 수신된 인증키를 입력하면, 서버(6)는 무선단말기(2)에 전송한 인증키와 입력수단(8)에 의해 입력된 인증키를 비교하여, 고객의 신원을 확인할 수 있도록 된 것을 특징으로 하는 무선단말기를 이용한 인증시스템이 제공된다.According to the present invention, a wireless terminal 2 owned by each customer, and a database 4 on which each customer's ID and the number of the wireless terminal 2 are recorded are constructed and connected to the wireless terminal 2 using wireless communication. And a server 6 capable of transmitting data, and an input means 8 connected to the server 6 via wired, wireless communication or the Internet so as to input a customer ID and authentication key. When the customer inputs his ID using the input means 8, the server 6 determines an arbitrary authentication key and transmits it to the wireless terminal 2 of the customer corresponding to the ID. When the authentication key received in the own wireless terminal 2 through the input means 8, the server 6 is the authentication key transmitted to the wireless terminal 2 and the authentication input by the input means (8) By comparing the keys, using the wireless terminal, characterized in that the identity of the customer can be confirmed This increases system is provided.
Description
본 발명은 무선단말기를 이용한 인증시스템에 관한 것으로서, 보다 상세하게는 고객이 항상 휴대하는 무선통신단말기를 이용하여 고객의 신원을 확인할 수 있도록 된 새로운 개념의 무선단말기를 이용한 인증시스템에 관한 것이다.The present invention relates to an authentication system using a wireless terminal, and more particularly, to an authentication system using a wireless terminal of a new concept that enables a customer to check the identity of a customer using a wireless communication terminal that is always carried by the customer.
요즈음에 들어, 통신기술이 발전되고 사회가 복잡해져 감에 따라, 신용카드나 현금카드를 이용한 전자결제 또는 인터넷을 이용한 전자상거래와 같이, 통신을 이용하여 온라인으로 결체를 하는 온라인 결제시스템의 사용이 급속히 증가하고 있다.In recent years, as communication technology has developed and society has become more complex, the use of online payment systems, such as electronic payments using credit or debit cards or electronic commerce using the Internet, has been rapidly used. It is increasing.
이러한 통신을 이용한 온라인 결제시스템은 고객이 업소나 인터넷 쇼핑몰 등을 이용하여 대금결제를 요청할 경우, 별도의 인증시스템을 이용하여 고객의 신원을 확인하게 된다. 이러한 인증시스템은 각 고객에게 ID와 비밀번호를 부여하여, 고객이 자신의 ID와 비밀번호를 입력하도록 하므로써, 고객의 신분을 확인할 수 있도록 구성된다. 이때, 고객이 ID를 손쉽게 입력할 수 있도록, 신용카드나 현금카드 또는 기타 ID카드와 같이, 고객의 ID가 기록된 마그네틱 테이프가 구비된 카드를 고객에게 지급하여, 카드에 기록된 고객의 ID를 카드리더로 읽어 판독할 수 있도록 한 경우도 있다. 따라서, 고객이 직접 또는 카드를 이용하여 ID를 입력하고, 필요에 따라 비밀번호를 입력하여, 고객의 신원을 확인한 후, 온라인 결제시스템을 이용하여 대금을 결제할 수 있었다.The online payment system using such a communication checks the identity of the customer by using a separate authentication system when the customer requests payment through a business or an internet shopping mall. This authentication system is configured to confirm the identity of the customer by giving each customer an ID and password, and allowing the customer to enter their ID and password. At this time, in order to allow the customer to easily enter the ID, a card with a magnetic tape on which the customer's ID is recorded, such as a credit card, cash card or other ID card, is provided to the customer and the ID of the customer recorded on the card is provided. In some cases, the card reader can be read and read. Therefore, after the customer inputs an ID directly or by using a card, inputs a password as necessary, confirms the identity of the customer, and then pays the price using the online payment system.
그런데, 이러한 인증시스템에서 사용되는 ID나 비밀번호는 타인에게 노출될 수 있으므로, 타인이 고객의 ID와 비밀번호를 도용하여 부정사용할 수 있는 문제점이 있었다. 특히, 신용카드나 현금카드는 복제가 가능하고, 사용시 비밀번호가 쉽게 노출될 뿐 아니라, 절차상의 불편함 때문에, 별도의 비밀번호를 입력하지 않고, 카드의 뒷면에 기재된 사인과 사용자가 매출전표에 기록한 사인만을 비교하여, 사용자의 신원을 확인하므로, 부정사용이 용이한 문제점이 있었다.However, since the ID or password used in this authentication system may be exposed to others, there is a problem that others can use the customer's ID and password by fraudulent use. In particular, credit cards and cash cards can be duplicated, passwords are easily exposed when using them, and procedures are inconvenient. Compared only, so as to confirm the identity of the user, there was a problem that it is easy to use fraudulently.
이러한 문제점은 전술한 거래시스템에서만 발생되는 것이 아니라, 보안시스템과 같이, ID와 비밀번호를 이용하여 고객이나 방문자의 신원을 확인할 수 있도록 된 모든 종류의 시스템에서 공통적으로 발생된다.This problem is not only occurred in the above-described trading system, but is common in all kinds of systems that can identify the customer or the visitor by using an ID and a password, such as a security system.
따라서, 복제가 가능한 카드를 사용하지 않고, 고객의 ID 또는 비밀번호의 노출에 따른 부정사용을 방지할 수 있도록 된 새로운 인증시스템이 필요하게 되었다.Therefore, there is a need for a new authentication system capable of preventing unauthorized use due to exposure of a customer's ID or password without using a card that can be duplicated.
본 발명은 상기의 문제점을 해결하기 위한 것으로서, 본 발명의 목적은 별도의 카드를 이용하지 않고, 고객이 항상 휴대하는 무선단말기를 이용하여 사용자의 신원을 즉석에서 확인할 수 있으며, 고객의 ID 또는 비밀번호의 노출에 따른 부정사용을 바지할 수 있도록 된 새로운 인증시스템을 제공하는 것이다.The present invention is to solve the above problems, the object of the present invention is to use the wireless terminal that the customer always carry, without using a separate card, you can instantly identify the user's identity, customer ID or password It is to provide a new certification system that can cope with fraud due to the public exposure.
도 1은 본 발명에 따른 무선단말기를 이용한 인증시스템을 도시한 구성도1 is a block diagram showing an authentication system using a wireless terminal according to the present invention
<도면의 주요부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>
2. 무선단말기 4. 데이터베이스2. Wireless terminal 4. Database
6. 서버 8. 입력수단6. Server 8. Input Means
본 발명에 따르면, 각 고객소유의 무선단말기(2)와, 각 고객의 ID 및 무선단말기(2)의 번호가 기록된 데이터베이스(4)가 구축되며 무선통신을 이용하여 상기 무선단말기(2)에 데이터를 송신할 수 있도록 된 서버(6)와, 유,무선통신 또는 인터넷을 통해 상기 서버(6)와 연결되어 고객의 ID와 인증키를 입력할 수 있도록 된 입력수단(8)을 포함하여 구성되며, 고객이 상기 입력수단(8)을 이용하여 자신의 ID를 입력하면, 서버(6)는 임의의 인증키를 결정하여 이를 ID에 해당되는 고객의 무선단말기(2)에 전송하고, 고객이 상기 입력수단(8)을 통해 자신의 무선단말기(2)에 수신된 인증키를 입력하면, 서버(6)는 무선단말기(2)에 전송한 인증키와 입력수단(8)에 의해 입력된 인증키를 비교하여, 고객의 신원을 확인할 수 있도록 된 것을 특징으로 하는 무선단말기를 이용한 인증시스템이 제공된다.According to the present invention, a wireless terminal 2 owned by each customer, and a database 4 on which each customer's ID and the number of the wireless terminal 2 are recorded are constructed and connected to the wireless terminal 2 using wireless communication. And a server 6 capable of transmitting data, and an input means 8 connected to the server 6 via wired, wireless communication or the Internet so as to input a customer ID and authentication key. When the customer inputs his ID using the input means 8, the server 6 determines an arbitrary authentication key and transmits it to the wireless terminal 2 of the customer corresponding to the ID. When the authentication key received in the own wireless terminal 2 through the input means 8, the server 6 is the authentication key transmitted to the wireless terminal 2 and the authentication input by the input means (8) By comparing the keys, using the wireless terminal, characterized in that the identity of the customer can be confirmed This increases system is provided.
이하, 본 발명의 바람직한 실시예를 첨부한 도면에 의거하여 설명하면 다음과 같다.Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.
도 1은 본 발명에 따른 무선단말기를 이용한 인증시스템을 도시한 것으로, 각 고객소유의 무선단말기(2)와, 고객의 ID 및 무선단말기(2)의 번호가 기록된 데이터베이스(4)가 구축된 서버(6)와, 유,무선통신 또는 인터넷을 통해 상기 서버(6)와 연결되어 소정의 문자기호를 입력할 수 있도록 된 입력수단(8)으로 구성된다.1 shows an authentication system using a wireless terminal according to the present invention, in which a wireless terminal 2 owned by each customer, and a database 4 in which a customer ID and a number of the wireless terminal 2 are recorded are constructed. It is composed of a server (6) and input means (8) connected to the server (6) via wired, wireless communication or the Internet to input a predetermined character symbol.
상기 무선단말기(2)는 통상의 휴대폰이나 PCS, PDA, IMT200 등과 같이, 문자통신이 가능한 모든 종류의 무선통신용 단말기를 이용한다. 고객의 ID는 고객이 전자결제서비스에 가입할 결정되는 것으로, 필요에 따라 변경가능하다. 상기 서버(6)는 가입고객의 신원을 확인하는 인증서비스를 제공하는 회사에 설치되며, 무선통신을 통해 상기 무선단말기(2)와 테이터통신을 할 수 있도록 구성된 것으로, 고객이 상기 입력수단(8)을 통해 자신의 ID를 입력하면, 기호나 문자 또는 숫자로 이루어진 임의의 인증키를 결정하여 고객의 무선단말기(2)에 전송한다. 상기 입력수단(8)은 각 업소에 설치된 통상의 퍼스널 컴퓨터 또는 전용 단말기를 이용하는 것으로, 고객이 이 입력수단(8)을 이용하여 자신의 ID와 자신의 무선단말기(2)에 송신된 인증키를 입력할 수 있다. 이때, 상기 입력수단(8)은 인터넷 쇼핑몰의 홈페이지에 구성된 입력부를 이용하여, 고객이 인터넷쇼핑시 자신의 ID와 인증키를 입력할 수 있도록 하는 것도 가능하다.The wireless terminal 2 uses any type of wireless communication terminal capable of text communication, such as a conventional mobile phone, PCS, PDA, IMT200, or the like. The customer's ID is determined by the customer to subscribe to the electronic payment service, and can be changed as necessary. The server 6 is installed in a company that provides an authentication service for confirming the identity of a subscriber, and is configured to perform data communication with the wireless terminal 2 through wireless communication. If you enter your ID through), it determines the arbitrary authentication key consisting of symbols, letters or numbers and transmits to the customer's wireless terminal (2). The input means 8 uses a normal personal computer or a dedicated terminal installed in each business, and the customer uses the input means 8 to send his ID and the authentication key transmitted to his wireless terminal 2. You can enter In this case, the input means 8 may also enable the customer to input his or her ID and authentication key using the input unit configured on the homepage of the Internet shopping mall.
따라서, 고객이 각 업소나 인터넷 쇼핑몰을 이용한 후, 상기 입력수단(8)을 통해 자신의 ID를 입력하면, 상기 서버(6)가 임의의 인증키를 결정하여 고객의 무선단말기(2)에 인증키를 전송한다. 그리고, 고객이 자신의 무선단말기(2)에 수신된 인증키를 상기 입력수단(8)을 통해 입력하면, 상기 서버(6)는 자신이 결정한 인증키와 고객이 입력한 인증키를 비교하여, 결제를 신청한 고객의 신원을 확인할 수 있다. 이때, 상기 버서에는 은행이나 카드회사 등의 금융기관의 결제용 서버(10)가 연결되어, 신원이 확인된 고객의 계좌에서 금액을 인출하여 결체를 할 수 있다. 또한, 인터넷 쇼핑몰의 홈페이지에 구비되어 고객의 ID와 인증키를 입력할 수 있도록 된 입력부를 이용하여 상기 입력수단(8)을 구성하므로써, 인터넷을 이용한 인터넷 쇼핑몰의 결제시에도 적용할 수 있다.Therefore, when the customer enters his or her ID through the input means 8 after using each business or Internet shopping mall, the server 6 determines an arbitrary authentication key and authenticates the wireless terminal 2 of the customer. Send the key. Then, when a customer inputs the authentication key received in his wireless terminal 2 through the input means 8, the server 6 compares the authentication key determined by the customer and the authentication key input by the customer, The identity of the customer who applied for payment can be verified. At this time, the server is connected to a payment server 10 of a financial institution such as a bank or a card company, and withdraw money from the account of the customer whose identity is confirmed. In addition, by configuring the input means (8) using the input unit provided on the homepage of the Internet shopping mall to be able to enter the ID and authentication key of the customer, it can be applied to payment of the Internet shopping mall using the Internet.
이와같이 구성된 무선단말기를 이용한 인증시스템은 고객의 결제신청시, 고객이 자신의 무선단말기(2)에 수신된 인증키를 상기 입력수단(8)을 통해 입력하여야 하여야만 고객의 신원을 확인하여 거래를 승인하므로, 고객의 휴대폰과 ID를 동시에 이용하여야만 거래를 할 수 있다. 따라서, ID가 노출되거나, 휴대폰을 잃어버려도 타인이 부정사용할 수 없는 장점이 있다. 특히, 거래에 사용되는 인증키는 수시로 변경되므로, 일정한 ID와 비밀번호를 사용하는 종래의 인증시스템에 비해 보완유지가 뛰어난 장점이 있다.In the authentication system using the wireless terminal configured as described above, the customer confirms the identity of the customer and approves the transaction only when the customer applies for payment, the authentication key received by the wireless terminal 2 through the input means 8. Therefore, you can make a transaction only by using your mobile phone and ID at the same time. Therefore, even if the ID is exposed or the mobile phone is lost, there is an advantage that others cannot use it illegally. In particular, since the authentication key used in the transaction is changed from time to time, there is an advantage that the complementary maintenance is superior to the conventional authentication system using a constant ID and password.
이러한 무선단말기를 이용한 인증시스템은 전술한 바와 같은 대금결제수단 이외에도, 고객이나 방문객의 신원을 확인하여야 하는 보안시스템이나, 고객이 티켓을 예매한 후 자신의 인증키를 이용하여 티켓을 찾아갈 수 있도록 하는 티켓예매시스템 또는, 기타 신원확인이 필요한 신용거래를 위한 인증시스템 등에 적용될 수 있다. 특히, 이러한 인증시스템을 컴퓨터 네트워크에 적용하여, 매번 다른 비밀번호를 입력하도록 하므로써, 해커가 비밀번호를 해킹하여 네트워크에 침입하는 것을 방지하도록 할 수 있다.In addition to the above payment methods, the authentication system using the wireless terminal is a security system that needs to confirm the identity of the customer or the visitor, or allows the customer to visit the ticket using his own authentication key after booking the ticket. It may be applied to a ticket reservation system or an authentication system for credit transactions requiring identification. In particular, by applying such an authentication system to a computer network, by entering a different password every time, it is possible to prevent hackers to hack into the network by hacking the password.
이상에서와 같이 본 발명에 의하면, 고객의 ID를 입력하면, 서버(6)가 입의의 인증키를 고객의 무선단말기(2)에 전송하고, 고객이 자신의 무선단말기(2)에 수신된 인증키를 서버(6)에 재전송하여 고객의 신원을 확인할 수 있도록 하므로써, 별도의 카드를 이용하지 않고 고객이 항상 휴대하는 무선단말기(2)를 이용하여 사용자의 신원을 즉석에서 확인할 수 있으며, 고객의 ID 또는 비밀번호의 노출에 따른 부정사용을 바지할 수 있도록 된 새로운 인증시스템을 제공할 수 있다.According to the present invention as described above, when the ID of the customer is input, the server 6 transmits the authentication key of the mouth to the wireless terminal 2 of the customer, and the customer receives the received wireless terminal 2 of the customer. By re-sending the authentication key to the server 6 so that the identity of the customer can be verified, the identity of the user can be immediately confirmed by using the wireless terminal 2 that the customer always carries without using a separate card. It is possible to provide a new authentication system that can prevent fraudulent use due to the exposure of an ID or password.
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| Application Number | Priority Date | Filing Date | Title |
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| KR1019990057586A KR20000012607A (en) | 1999-12-14 | 1999-12-14 | certification system using radio communication device |
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| KR1019990057586A KR20000012607A (en) | 1999-12-14 | 1999-12-14 | certification system using radio communication device |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000017997A (en) * | 2000-01-03 | 2000-04-06 | 고문규 | System and method of user verification for electronic commerce using a wireless communication terminal |
| KR20000072433A (en) * | 2000-09-04 | 2000-12-05 | 오재연 | Anti-hacking Technique using mobile data terminal and temporary password |
| KR20020015760A (en) * | 2000-08-23 | 2002-03-02 | 안세환 | Monetary settlement system in electronic commerce with pre-registered id of credit card and method of electronic commerce using thereof |
| KR20020046813A (en) * | 2000-12-15 | 2002-06-21 | 조정남 | User verification method by using voice for use in electronic commerce |
| WO2003014994A1 (en) * | 2001-08-07 | 2003-02-20 | Wedison Technologies, Inc. | Accounting method by authentication of mobile telecommunication company |
| WO2003014995A1 (en) * | 2001-08-07 | 2003-02-20 | Wedison Technologies, Inc. | Accounting method by authentication of mobile telecommunication company |
| KR100378368B1 (en) * | 2000-07-28 | 2003-03-29 | 삼성전자주식회사 | Method for preventing outflow of internet personal information using mobile terminal |
| KR20030037147A (en) * | 2001-11-02 | 2003-05-12 | 주식회사 엠넷소프트 | System and method for looking into a person's identity through a wired and wireless network |
| KR100790495B1 (en) * | 2006-03-07 | 2008-01-02 | 와이즈와이어즈(주) | Authentication method, system, server and recording medium for controlling mobile communication terminal using encryption algorithm |
| KR20130076949A (en) * | 2011-12-29 | 2013-07-09 | 주식회사 인프라웨어 | Device authentication method by login session passing |
| KR101443849B1 (en) * | 2014-03-10 | 2014-09-23 | 주식회사 민앤지 | Security management method for authentication message |
| WO2016064127A1 (en) * | 2014-10-25 | 2016-04-28 | 홍승은 | System and method for mobile cross-authentication |
| KR20170029483A (en) * | 2017-03-09 | 2017-03-15 | 홍승은 | Mobile cross-authentication system and method |
| KR20190036740A (en) * | 2017-09-28 | 2019-04-05 | 에스케이플래닛 주식회사 | Service providing system and method for security based on multi-channel authentication, and non-transitory computer readable medium having computer program recorded thereon |
| US11966907B2 (en) | 2014-10-25 | 2024-04-23 | Yoongnet Inc. | System and method for mobile cross-authentication |
-
1999
- 1999-12-14 KR KR1019990057586A patent/KR20000012607A/en not_active Ceased
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000017997A (en) * | 2000-01-03 | 2000-04-06 | 고문규 | System and method of user verification for electronic commerce using a wireless communication terminal |
| KR100378368B1 (en) * | 2000-07-28 | 2003-03-29 | 삼성전자주식회사 | Method for preventing outflow of internet personal information using mobile terminal |
| KR20020015760A (en) * | 2000-08-23 | 2002-03-02 | 안세환 | Monetary settlement system in electronic commerce with pre-registered id of credit card and method of electronic commerce using thereof |
| KR20000072433A (en) * | 2000-09-04 | 2000-12-05 | 오재연 | Anti-hacking Technique using mobile data terminal and temporary password |
| KR20020046813A (en) * | 2000-12-15 | 2002-06-21 | 조정남 | User verification method by using voice for use in electronic commerce |
| WO2003014995A1 (en) * | 2001-08-07 | 2003-02-20 | Wedison Technologies, Inc. | Accounting method by authentication of mobile telecommunication company |
| WO2003014994A1 (en) * | 2001-08-07 | 2003-02-20 | Wedison Technologies, Inc. | Accounting method by authentication of mobile telecommunication company |
| KR20030037147A (en) * | 2001-11-02 | 2003-05-12 | 주식회사 엠넷소프트 | System and method for looking into a person's identity through a wired and wireless network |
| KR100790495B1 (en) * | 2006-03-07 | 2008-01-02 | 와이즈와이어즈(주) | Authentication method, system, server and recording medium for controlling mobile communication terminal using encryption algorithm |
| KR20130076949A (en) * | 2011-12-29 | 2013-07-09 | 주식회사 인프라웨어 | Device authentication method by login session passing |
| KR101443849B1 (en) * | 2014-03-10 | 2014-09-23 | 주식회사 민앤지 | Security management method for authentication message |
| WO2016064127A1 (en) * | 2014-10-25 | 2016-04-28 | 홍승은 | System and method for mobile cross-authentication |
| US11966907B2 (en) | 2014-10-25 | 2024-04-23 | Yoongnet Inc. | System and method for mobile cross-authentication |
| KR20170029483A (en) * | 2017-03-09 | 2017-03-15 | 홍승은 | Mobile cross-authentication system and method |
| KR20190036740A (en) * | 2017-09-28 | 2019-04-05 | 에스케이플래닛 주식회사 | Service providing system and method for security based on multi-channel authentication, and non-transitory computer readable medium having computer program recorded thereon |
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