• Review of KIISC
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• v.7 no.3
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• pp.39-52
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• 1997

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 2004.07a
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• pp.407-407
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• 2004

• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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• 2002.11a
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• pp.266-269
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• 2002

As a simulation or replacement of analog money in cyber space, the e-cash was introduced by using cryptographic primitives. Since a perfect anonymity system causes some illegal activities, such as money laundering, blackmailing, and illegal purchase, a revocable electronic system was paid a great attention to control the anonymity. In general, Trust Third Party(TTP) is introduced to detect any dubious user and coin, namely user tracing and coin tracing. In this paper we propose a new revocable anonymity e-cash system, and verify the security requirement as well. In our scheme a user first withdraws the e-coin from bank by using blind signature, and then TTP verifies the bank's signature and records the tracing information.

• The Journal of Information Technology
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• v.8 no.3
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• pp.159-176
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• 2005

The Purpose of this Article is to analyze the special settlement and electronic settlement system in the international trade. First, Factoring is a fast, easy and flexible way to improve a company's cash flow and generate working capital for the company. Factoring can be short-term or part of an ongoing financing program. New companies can benefit as well, since there is no requirement for a long-term credit history. Second, Forfaiting is a method of trade financing that allows exporters to obtain cash and be free of all risks by selling their medium term receivables on a 'without recourse' basis. Forfaiting can be an alternative to export credit or insurance cover, especially for those transactions in which the export credit agency is not open to a particular country and/or bank. Third, The Bolero System is jointly financed by SWIFT(Society for World International Financial Telecommunications) which handles most of the electronic funds transfer for banks, and the Through Transport Mutual Assurance Association(the TT Club), a mutual insurance association most of whose members are drawn from the Multimodal transport industry or transport intermediaries. Fourth, TradeCard is a payment and settlement system that is an alternative to letters of crdeit. That is, TradeCard is a business-to-business e-commerce infrastructure that enables buyers and sellers to conduct and settle international trade transactions securely over the Internet.

• Proceedings of the Korea Contents Association Conference
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• 2006.05a
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• pp.462-465
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• 2006

Now a days the banks, with a wide spread of credit transaction practice in every business, offer better services to their customers, while the automation of banking is being made more rapid progress in th light of efficient banking service. For example, it is true that the automation of cash payment for customers goes on its progress and the competition between companies is getting more serious. Lately the banks that pursue "Banking Automation System" expand distribution of cash dispenser for the better electronic computer service and for the better service for their customers in quality. Therefore the makers producing "CD" accelerate their development of CD in various ways in order to secure M/S as the leading group of th field. CD, a kind of an automatic paying, is being used generally, and has various functions and its design is getting more compact than ever. Under this situation, I studied more trustworthy and convenient CD design suggestions in the way of case study on the basis of the process of developing CD and I suggest the better way of developing the design of CD in the future.

• Archives of design research
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• v.12 no.2
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• pp.5-16
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• 1999

Nowadays the banks, with a wide spread of credit transaction practice in every business, offer better services to their customers, while the automation of banking is being made more rapid progress in th light of efficient banking service. For example, it is true that the automation of cash payment for customers goes on its progress and the competition between companies is getting more serious. Lately the banks that pursue "Banking Automation System" expand distribution of cash dispenser for the better electronic computer service and for the better service for their customers in quality. Therefore the makers producing "CD" accelerate their development of CD in various ways in order to secure MIS as the leading group of th field. CD, a kind of an automatic paying, is being used generally, and has various functions and its design is getting more compact than ever. Under this situation, I studied more trustworthy and convenient CD design suggestions in the way of case study on the basis of the process of developing CD and I suggest the better way of developing the design of CD in the future.of CD in the future.

• Journal of the Korea Computer Industry Society
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• v.5 no.8
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• pp.801-810
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• 2004

It is only 2 ~ 3 years in the interior to be introduced as a Ubiquitous era after going through mainframe, PC and internet era on account of the advent of computer. This thesis intends to present a model device of an epoch-making cash management system using the RFID(Radio Frequency Identification) Tag and EPC (Electronic Product Code) Platform which are core technologies of the Ubiquitous Computing on the assumption that cable and wireless internet is constructed in university. Also this sets up a purpose to minimize the administrative procedure as well as the waste of time, people and cost which are problems of the cash management system operating now. Therefore as a research project hereafter, it will be able to present an imporvement device about the problems which cannot solve these days through the model of the proposing cash management system when the standardization, normalization and commercialization of advanced IT department are accomplished.

• International Commerce and Information Review
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• v.2 no.1
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• pp.1-28
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• 2000

IT 혁명으로 전자적인 활동이 전 사회의 중심 축으로 이루어지고, 또한 컴퓨터를 이용한 정보처리와 통신기술의의 눈부신 발달에 힘입어 기업의 Business에 커다란 변화를 초래하게 되었다. 특히, 인터넷이라는 환경하에서 전자상거래는 급속하게 성장하고 있으며, 기업은 전자상거래 모델을 앞다투어 개발하면서 새로운 E-Business 환경을 수용하고 있다. 또한 기업은 무역업무에 이러한 전자상거래를 도입하면서 국제간 거래의 활성화를 위해 노력하고 있지만, 국채간 사이버 무역이 안고 있는 여러 가지 애로점을 가지고 있다. 그 중에서 국제간 전자결제에 과한 문제이다. 인터넷을 이용한 무역업무를 실행시키고, 활성화하기 위한 하나의 결제방안을 제시해 보면 제3자에 의한 결제 시스템으로서 인터넷 서비스 제공업자, S/W 개발업체, 은행과 신용카드회사를 비롯한 금융기관 등은 결제시스템을 구축하는 방안이 강구될 수 있다. 또한 이 시스템에서는 다양한 판매자의 제품을 소개하고 일정 시간간격 또는 특정 구매자의 총누적 거래대금이 일정수준에 이를 때에 결제함으로써 신용카드를 지불수단으로 사용하는 경우에도 소액거래를 지원할 수 있다. 또한 전자결제제도가 성립되기 위해서는 전자자금거래의 규제를 위한 법 제도적인 측면의 정비가 시급하다. 따라서 각종 거래의 결제에 관한 법적관계는 물론 금융관련 법률을 기본으로 하여 새로운 접근방안을 마련해야 할 것이다. 이와 같은 사항들을 고려함으로써 사이버 환경의 활성화를 도모할 수 있다.

• Proceedings of the Korea Database Society Conference
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• 2000.11a
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• pp.239-248
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• 2000

전자화폐 시스템은 인출(withdrawal), 지불(payment) 그리고 예치(deposit)의 기본적인 과정을 수행하는데, 이러한 단계에서 사용자의 사생활(privacy)을 보호하기 위해 사용자와 사용자의 구입 내용 및 지불 내용을 연계시키지 않고 인출 단계와 지불 단계가 연결되지 않도록 기본적으로 익명성을 제공하고 있다. 하지만 이러한 완전한 익명성을 제공하므로 인해 돈 세탁, 약탈, 불법 거래와 같은 불법적인 범죄 행위들에 이용 될 수 있으며 이 때 이와 같은 범죄행위를 한 사용자와 그 돈에 대한 행방을 찾을 수가 없다. 따라서 이를 방지하기 위해 일정한 조건 아래에서 익명성을 제어하기 위한 연구들이 많이 진행되어 왔다. 본 논문에서는 DSS에 기반한 새로운 공정한 은닉 서명 방식을 제안하고 이를 전자화폐 시스템에 적용시킨다.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.13 no.6
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• pp.113-119
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• 2003

In WISA 2002, Ham et al. proposed a one-way mobile payment system. They claimed that the electronic cash of the system satisfies unforgeability and double spending prevention. In this paper, we point out that their system is not secure as they claimed by showing that the forgery of payment scripts is possible.