• Journal of the Korea Institute of Information Security & Cryptology
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• v.12 no.6
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• pp.125-135
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• 2002

The electronic payment system based on blind signature is susceptible to the blackmailing attack as opposed to keep the lifestyle of users private. In this paper. we suggest an efficient electronic cash system using a blind XTR-DSA scheme, which improves the method of defeating blackmailing in online electronic cash systems of ［6,9］. In case of blackmailing, to issue the marked coins we use the blind XTR-DSA scheme at withdrawal. In ［6,9］, to cheat the blackmailer who takes the marked coins the decryption key of a user had to be transferred to the Bank. But in our proposed method the delivery of the decryption key is not required. Also, in the most serious attack of blackmailing. kidnapping, we can defeat blackmailing with a relatively high probability of 13/18 compared with 1/2 in ［9］ and 2/3 in ［6］. If an optimal extension field of XTR suggested in ［7］ is used, then we can implement our system more efficiently.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2000.10a
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• pp.284-287
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• 2000

Recently, developing medical devices have a tendency becoming the module for satisfying user's mutual complex needs. Because the most effective method for the observation of patients condition a diagnosis and a treatment is collecting data from various devices and controling operation following it. Module tendency is more popular due to manage easily totally many individual systems. This study implemented communication protocol to control by one control system connecting modular medical devices. Implemented system consist of one master module controlling all module and managing communication and many Slave modules. Communication between each modules introduced SPI(Serial Peripheral Interface) among many synchronous serial communication methods for the exact transmission and receipt of data. All communication executes by packet format. This can detect error. And, this protocol introduced PNP(Plug And Play) function that auto-detect connecting or removing module during running. This protocol exactly transmitted and received in faster speed more than 1Mbps. And in practical application to the ventilator this confirmed to give and take real-time data. And various functions by th central control system is implemented in this protocol.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 1998.05a
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• pp.276-281
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• 1998

본 논문에서는 온라인 전자현금 시스템을 설계하고 개발한다 개발된 전자현금 시스템은 공개키 알고리즘, 맹목 서명, tut-and-choose등과 같은 다양한 암호화 기법들이 사용되어 안전성을 높였으며 특히, 전자현금의 이중 사용(double spending)의 효과적인 방지를 위해 2중 은행 구조(2-level bank structure)를 취함으로써 통신망을 오가는 트래픽의 양을 많이 줄이고자 하였다. 이 구조의 가장 큰 특징을 각 은행마다 그 은행에서 발행하는 전자현금을 구분하기 위해서 전자 현금의 정보에 들어 있는 일련번호(sequence number)의 값을 은행별로 범주화한다는 점과, 이를 지원하기 위해서 각 은행마다 Cash Clearing Agent라는 모듈을 가진다는 점이다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2000.05a
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• pp.43-49
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• 2000

That modem society is an information society, information society has placed a high value on information and knowledge. Therefore, modem civilization depends largely on information and knowlege so the most valuable sources of all intelligence activities. This paper was studied on the new developmental direction for intelligent network service. The results of this study is as follow: first, intelligent network service must be systematic development. Second, intelligent network service must be promoted, presenting the development and establishment direction in future society. Third, intelligent network service must be able to unify ail the networks. Fourth, intelligent network service must be development for customers. Fifth, the cost of intelligent network service is determined by Telecommunication Reguration Commission. Sixth, the number system of intelligent network service must be accomplished by number system for future

• THE INTERNATIONAL COMMERCE & LAW REVIEW
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• v.33
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• pp.247-275
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• 2007

This paper is to propose the Direction for the institutional improvement of Financial Supply Chain Management(FSCM) Solution which are currently coming into operation under Global e-Trading Platform. The Financial Supply Chain compromise the entire trade processes and information that manage a trader's cash, Accounts payable and receivable, Risk, working capital, and so on in international trade transaction. From a buyer's perspective, this involves the full procurement-to-payment process. For the seller, it is the order-to-cash cycle. Bolero provides the party concerned a e-trade platform which conformed to these fundamental pre-requisites to underpin fully electronic trade. But this FSCM solution have failed to provide the efficient platform to effectively manage the process of Global e-Trade because it does not correspond with e-Trade environment. Therefore, present FSCM system need the institutional improvement as follows: AA) Strengthening the role of the correspondent Bank under e-Trade System, BB) Extending the function of e-Trade intermediary institution, CC) The introduction of Trade Insurance System, etc. So, by streamlining and automating these processes on an open and flexible platform, The party concerned can optimize their trade transaction and maintain better relations with their business partners

• The KIPS Transactions:PartD
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• v.15D no.1
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• pp.121-130
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• 2008

In line with the enhanced weight and variety of electronic commerce in business activities, new type of payment settlement and banking system which will enable to store, create and transfer values from the existing method of payment settlement is highly required. Cyber Banking system draws strong attention being the solution of there requirements. The existing Cyber Banking system has the difficulty of operation, administration, in addition to the problem of initial facility investment of big amount, resulted from the usage of the current business process. As the existing Cyber Bank system is unable to carry out the function of storing, creating, and transferring values due to the adoption conventional credit card system instead of the application of non-stop payment system between the seller and buyer. As a result, current Cyber Bank system still imply the deficiency of non-performing cash payment function on internet. This paper describes (1) an integrated application process, One Process One Input (OPOI) which is essential for software development of the Cyber Bank, (2) an application process of payment settlement system to be applied to the electronic commerce in Internet. And then, with these for a basis, (3) design and implementation of payment settlement system through CyberBank for Electronic Commerce. Consequently, by means of this suggested process, we could attempt to solve the problem of existing Cyber Bank system and further to explore the possibility of advanced Cyber Banking being the non-stop payment settlement system. The effectiveness of this suggested system has been practically confirmed.

• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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• 1997.11a
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• pp.378-383
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• 1997

D. Chaum은 RSA암호알고리듬을 이용한 은닉서명방법으로 전자현금시스템을 제안했다. 그러나 이 방법은 사용자가 은행으로부터 전자현금을 발행받을 때 cut-and-choose방법을 사용함으로써 큰 통신부하(communication overhead)를 가지는 비효율적인 면이 있다. 본 논문은 제비뽑기방법을 이용하여 cut-and-choose방법을 사용하지 않고 사용자의 프라이버시를 보호하는 새로운 전자현금시스템을 제안한다.

• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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• 1998.12a
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• pp.85-96
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• 1998

본 논문에서는 향후 전자상거래 시대를 대비하여 전자화폐의 역기능을 검토하고 국제 결제은행(BIS)의 전자화폐시스템 모델과 일본 NTT의 전자화폐시스템 모델을 분석하였다. 그리고 전자화폐의 역기능에 대처할 수 있는 요구조건을 만족하는 전자화폐시스템 모델을 제안한다.

• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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• 2001.11a
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• pp.189-192
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• 2001

최근 정보통신기술의 발전과 인터넷의 폭발적인 사용자 증가로 인해 전자상거래가 활성화되고 있다. 또한 전자상거래에서 가장 중요한 시스템인 전자화폐 시스템에 대한 연구와 개발이 활발하게 진행되고 있다. 특히, 전자화폐 시스템의 요구사항 중에 분할성 관련된 연구는 대부분이 계층적 구조 테이블을 이용한 방식이었다. 하지만 이 방식은 많은 메모리가 필요하고, 또한 많은 계산량을 필요로 한다는 단점이 있다. 따라서 본 논문에서는 이러한 문제점을 해결하고, 계층적 구조 테이블을 이용하지 않고 분할성을 제공할 수 있는 또 다른 방식인 비밀분산 기법을 이용하여 새로운 전자화폐 시스템을 제안한다.

• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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• 2001.11a
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• pp.432-436
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• 2001

본 논문에서는 XTR을 이용해 Schnorr 개인식별 프로토콜을 구성하여 블랙메일링 공격이 있을 경우에 은행에게 블랙메일링 공격에 대한 정보를 개인식별 과정에서 알려주는 방법을 제안한다. 본 논문에서 제안한 XTR 버전의 Schnorr 개인식별 프로토콜을 사용하면 기존의 방법들이 블랙메일링 공격을 막기 위해 필요로 하는 가정들을 사용하지 않고도 효과적으로 블랙메일링 공격을 막을 수 있는 새로운 방법이 된다.