• International Commerce and Information Review
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• v.11 no.4
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• pp.47-73
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• 2009

Electronic Commerce has become the leading method of business in many countries. And related laws are being established and is operating in Korea and China. In this circumstance, Korea's electronic signature law was enacted on February 5, 1999, and has been applied from July 1, 1999. But China's electronic signature law was enacted on August 28, 2004, and has been formally applied from April 1, 2005. This paper is to drive problems of the electronic signature system and law and to show the whole point to be considered in enterprise and the present status of internal and external service under the basis of electronic trade. The purpose of this study aims to present a comparative analysis on the Korean and Chinese electronic signature system and law. In addition to, another point of this paper is suggestions for improvement of legal problem.

• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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• 1997.11a
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• pp.354-367
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• 1997

Chaum's blind signature scheme is the typical withdrawal procedure of electronic cash. In blind signature scheme, a signer sign a document while he never knows the content of the signed document. Yung and Jakobsson presented new signature scheme with which the content of document can be unblinded if unusual activity is detected. This signature is referred to as the magic ink signature. In this paper, we analyze the magic ink signature, and present two new magic ink signature schemes using KCDSA and Schnorr signature algorithm. We propose two types of the efficient electonic cash system using these magic ink signature schemes. One is the electronic cash system with a single server magic init signature scheme, and the other is the electronic cash system with a distributed magic ink signature scheme.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.9 no.2
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• pp.13-24
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• 1999

Electronic cash is a digital signature issued by bank. If the concept of the distributed secret sharing and magic ink signature is introduced in the existing electronic cash system we can increase the security level and the availability of electronic cash system and trace the electronic cash itself and the owner of electronic cash which was issued anonymously to a user in case of illegal usage of electronic cash by users. If the trust is concentrated on one bank system. the problem of misuse of bank can be occurred. To solve this problem, the distributed secrete sharing scheme need to be introduced in electronic cash system. In this paper We propose a DSS(Digital Signature Standard) distributed magic ink signature scheme and a KCDSA(Korea Certificate-based Digital Signature Algorithm) distributed magic ink signature scheme using a verifiable secret sharing method. and we compare two methods with respect to the required computation amount for the generation of magic-ink signature.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.9 no.4
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• pp.85-97
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• 1999

A blind signature scheme is a protocol allowing verifier to obtain a valid signature for a message m from a signer without him seeing the message. This means that the bank in collaboration with the shop cannot trace the electronic cash to user. However anonymous electronic cash also facilitates fraud and criminal acts such as money laundering anonymous blackmailing and illegal purchaes. Therefore in this paper we propose fair blind signature scheme based on KCDSA which is a domestic digital signature scheme and it apply a electronic cash system. In particularly a proposed electronic cash system have an anonymity control ability which trace a user who make use a electronic cash illegally in association with a trusted center.

• The KIPS Transactions:PartC
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• v.12C no.2 s.98
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• pp.169-174
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• 2005

Electronic signature system is required to be used in the promotion of the e-Commerce. Because the application system for electronic signature system has inconvenience and vulnerability of security, users are reluctant to use it. Therefore, the electronic signature system should give a guarantee of convenience and security. In this paper, we propose server-based application model, which uses identity information and makes users access transparently to solve electronic signature problems. We also design and verify electronic signature system that reduces threats to security, which cause server attack by distributing the part of signature key to both server and client. The application model with lightweight server system based on the electronic signature system is expected to be used in the promotion of the e-Commerce and help to make its business more efficient and competitive.

• Journal of Information Processing Systems
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• v.13 no.6
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• pp.1516-1526
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• 2017

Many organizations today use patch management systems to uniformly manage software vulnerabilities. However, the patch management system does not guarantee the integrity of the patch in the process of providing the patch to the client. In this paper, we propose a method to guarantee patch integrity through dual electronic signatures. The dual electronic signatures are performed by the primary distribution server with the first digital signature and the secondary distribution server with the second digital signature. The dual electronic signature ensures ensure that there is no forgery or falsification in the patch transmission process, so that the client can verify that the patch provided is a normal patch. The dual electronic signatures can enhance the security of the patch management system, providing a secure environment for clients.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.13 no.1
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• pp.3-10
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• 2003

In this paper, a partially blind signature schemes baled on EC-KCDSA is proposed and we applied it to design an electronic check payment system. Because the proposed partially blind signature scheme uses elliptic curve cryptosystem, it has better performance than any existing schems using RSA cryptosystem. When issuing a refund check, one-time pad secret key is used between the bank and the customer to set up secure channel. So the symmetric key management is not required.

• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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• 1994.11a
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• pp.35-44
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• 1994

We propose an undeniable digital signature scheme which is practical since it has less computation and communication overhead than Chaum's one. We expect that this protocol be useful to develop secure systems such as electronic contract system, electronic mail system and electronic cash system.

• ETRI Journal
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• v.37 no.1
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• pp.138-146
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• 2015

This paper presents a new non-constraining online optical handwritten signature reconstruction system that, in the main, makes use of a transparent glass pad placed in front of a color camera. The reconstruction approach allows efficient exploitation of hand activity during a signing process; thus, the system as a whole can be seen as a viable alternative to other similar acquisition tools. This proposed system allows people with physical or emotional problems to carry out their own signatures without having to use a pen or sophisticated acquisition system. Moreover, the developed reconstruction signature algorithms have low computational complexity and are therefore well suited for a hardware implementation on a dedicated smart system.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.11 no.3
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• pp.33-44
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• 2001

E-commerce has various advantages such as saving the cost and no constraint on time and space, unlike real-world commerce. On the other hand, e-commerce has some important issues to solve since the commerce is conducted on the cyberspace. The issues are a mutual confidence of parties participating in the commerce as well as a method of payments. On early days, electronic cash was designed using blind digital signature to protect the personal information from being exposed and to provide the perfect anonymity for user. In this paper, a new blind signature scheme based on Feige-Fiat-Shamir digital signature is proposed, which is very efficient compared with the other schemes in terms of the computational complexity. Also, a traceable Electronic Cash System which is based on the proposed blind digital signature is designed, which has a nice feature of identifying the spender in case of using the money illegally.