• Journal of KIISE:Computer Systems and Theory
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• v.30 no.7_8
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• pp.408-416
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• 2003

An electronic cash system has to provide the security, to prevent the double spending and to support the divisibility of electronic cash for the easy of use. Divisible electronic cash system allows an electronic cash to be divided into subdivisions. Each subdivision is worth any desired value, but all values must add up to the original cash value. Divisible scheme brings some advantages. It reduces to make the change and also there is no necessity that a customer must withdraw a cash of the desired value whenever transactions occur. In this paper, we present an electronic cash protocol which provides the divisibility based on the double hash chain technique. Electronic cash is constructed in the form of coins. Coins, generated by the double hush chain, have different denominations. The divisibility based on the double hash chain technique. Electronic cash is constructed in the form of coins. Coins, generated by the double hash chain, have different denominations. The divisibility of an electronic cash is satisfied by the payment certificate, which is a pair of bank´s proxy signature received from the bank. When a customer pays the coin of subdivision, the fairness of that coin is certified by a customer´s signing instead of a bank. Although the proposed method does not guarantee user´s anonymity, it generates coins which cannot be forged, and the customer can use an electronic cash conveniently and efficiently with its divisibility.

• Proceedings of the Korea Society for Industrial Systems Conference
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• 2000.05a
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• pp.33-41
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• 2000

최근 정보기술, 정보통신기술등의 발달로 기존의 상거래 방식과는 많이 다른 방식의 거래가 이루어지고 있다. Electronic Commerce의 활성화는 가상상점(Electronic Shopping Mall), 전자지불체계 (Electronic Payment System), Web EDI 등 인터넷을 기반으로 한 전자적 경제활동을 다양하게 하였다. 이러한 EC의 한 패러다임으로 이동 상거래 방식이 등장하게 되었다. 이것이 개방 네트워크와 공중망을 통하여 이용자의 위치, 시간과 관계없이 텍스트, 음성, 화상의 디지털 데이터를 이용하여 기업 또는 개인의 상거래 활동을 정의하는 전자상거래(Electronic Commerce) 방식 중의 하나인 모빌커머스(Mobile Commerce)이다. 본 연구에서는 이러한 모빌커머스가 기존의 인터넷 비즈니스의 한 방향으로서 유, 무선 통신망을 이용한 자유스런 정보의 전달을 통한해 어떤 상거래를 구축하는 것이 성공할 수 있는 것인가 이해하고자 전자상거래에서의 모빌커머스 역할에 대해 연구하고자 한다.

• Journal of Convergence Society for SMB
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• v.5 no.2
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• pp.21-26
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• 2015

Recently, NFC technology of short-range wireless communication using a smart phone to perform personal authentication with the electronic payment has been in the spotlight in various fields. However, the security associated with the personal information and the location information is vulnerable because it is easily fused with the existing mobile services and devices. In this paper, we propose a model for NFC payments help protect personal information and location information of NFC payment systems and services in various fields. Proposed model uses tag-based services in order to protect personal information and position information. The proposed model using the tag-based services is the place to check the various features available information in a simple Tag that can be easily accessed.

• Journal of the Korea Computer Industry Society
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• v.2 no.10
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• pp.1329-1338
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• 2001

This paper describes the biometrics system for user authentication in electronic commerce. At present, social demands are increasing for information security techniques against the information wiretapping in open communications network. For this, these techniques such as anti-virus, firewall, VPN, authentication, cryptography, public key based systems and security management systems have been developed. This Paper discusses the user authentication for the implementation of efficient electronic payment systems. In particular. user authentication system has keen developed using biometrics techniques and the effectiveness of this paper is demonstrated by several experiments.

• The Journal of the Korea institute of electronic communication sciences
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• v.18 no.6
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• pp.1371-1378
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• 2023

Kiosks are gaining popularity as an essential tool that offers unmanned services and payment systems, and their use is rapidly increasing in the service industry. However, the use of kiosks can be challenging for the elderly who are not accustomed to digital technology and touchscreens. Consequently, this study develops an educational program that utilizes metaverse technology to enhance the digital skills and kiosk service accessibility of older adults. This research has created an educational system that allows the elderly to learn digital skills and kiosk access through play.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.29 no.2C
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• pp.348-353
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• 2004

Development of an efficient and secure payment system is prerequisite for the construction of electronic payment mechanism in mobile environment. Since current PayWord protocol system generates vendor's certificate for each transaction, it requires lot of operation for transaction. In this paper, we use a session key generated by ID-based tripartite Key agreement protocol which use an Elliptic Curve Cryptosystem over finite field $F_{q}$ for transactions. Therefore, our protocol reduces algorithm operations. In particular, proposed protocol using ID-based public key cryptosystem has the advantages over the existing systems in speed and it is more secure in Man-in-the-middle attacks and Forward secrecy.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.9 no.2
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• pp.348-354
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• 2005

These days, Electronic mail is being used in everyday's life. And on the other hand, we are facing spam mails' problems. Spam mails are widely used by means of marketing in e-Commerce. To block these spam mails, we are using filtering or pricing systems. But these solutions are raising other problems such as impediment in reception or availability caused by false positive or payment resistance. To solve these problems, we propose an Indirect Model on Electronic Mail Control System(IMEMCS) which controls an unsolicited electronic mail and prevents an useful electronic mail from discarding. We design and implement the IMEMCS to enhance the usefulness and the availability. Being tested the IMEMCS to verify the usability and the efficiency, it gave us a very successful result.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.11 no.1
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• pp.73-85
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• 2001

Electronic check schemes are more efficient than electronic coin scheme with respect to computational costs and the amount of information exchanged. In spite of these, difficulties in making a refund reusable and in representing the face value of a check have discouraged its development. In this paper, a new online electronic check system is presented, which solves the above problems. This system uses the partially blind signature to provide user anonymity and to represent the face value of a check. The partially blind signature enables us to make the format of refunds and initially withdrawn checks identical. Thus, it allows refunds to be reused to buy goods without any limitatiosn. Both initially withdrawn checks and refunds in our system guarantee untraceability as well as unlinkability. We also use a one-time secret key as the serial number of a check to increase the efficiency of payments. The presented check system also provides multiple offline shopping sessions to minimize the number of online messages handled by a bank. During the multiple offline shopping session, we use a one-way accumulator to provide non-repudiation service. We also analyze our new systems our new system\`s security, efficiency, and atomicity.

• Proceedings of the Korean Information Science Society Conference
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• 1998.10a
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• pp.353-355
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• 1998

전자지불 시스템은 여러 조건을 필요로 하지만, 그 중에서도 이중 사용의 방지는 전자현금의 구현을 위해 꼭 갖추어야 할 조건이다. 이러한 이중사용의 방지를 위해 안전한 하드웨어를 사용하거나, 중앙서버에서 확인을 해주는 방법이 제안되고 있다. 중앙서버에서 확인을 해주는 방법은 기반 시스템이 없어도 사용이 가능하고 더 안전하다고 여겨지고 있다. 그러나, 중앙서버에서의 병목현상이 문제가 되며, 중앙서버가 외부의 침입에 의해 사용할 수 없게 되면 전체 시스템을 사용할 수 없게 된다. 본 논문에서는 중앙서버와 상점의 사이에 Gateway 를 두어 이러한 문제를 줄일 수 있는 구조를 제안하고자 한다.

• The Journal of Society for e-Business Studies
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• v.4 no.3
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• pp.95-118
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• 1999

There have been many research papers and practical implementations on the various EC(Electronic Commerce) aspects such as merchant system, security, payment gateway, legal and policy issues. However, it is very hard to find the systematic approaches and business process models from the viewpoint of the company willing to start B2C(Business-To-Customer) EC. Therefore, we develop business process models for the planning, systems analysis and design, implementation, and operation of internet shopping mall to suggest a guideline and reference model for the realization of successful B2C EC.