• The Journal of the Convergence on Culture Technology
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• v.5 no.3
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• pp.55-60
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• 2019

It is true that Blockchain has been known as a core technology for cryptocurrency like bitcoin (BTC). It is caused by its rapid value rises. Now, one BTC is trading around 10,000 US dollars while it bought just less than one dollar at its first trading in May, 2010. Blockchain makes on-line transactions possible by the safe cryptocurrency swiftly based on P2P network and distributed public ledger while its on-line traffic is rapidly increasing. However, this technology has bigger potential in the fourth industrial revolution era and its application areas will be varied. The evolving intelligent information society needs to make new added value through utilizing, sharing and processing of useful digital information. Obstacles such as hacking and fraud often exist when transactions of digital properties, right transfers, etc. are done through digital network specialized with anonymity. It is expected that blockchain will be a definite solution in this regard. This paper addresses useful development directions and countermeasures for blokchain in the digital economy by analysis of its current status and issues.

• Proceedings of the Korean Information Science Society Conference
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• 2004.10a
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• pp.301-303
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• 2004

디지털 티켓이란 티켓의 소유자에게 전자 서비스에 대한 특정한 권한을 보장하는 증명서이다. 디지털 티켓이 사용되는 응용 분야는 다양하며, 분야에 따라서 사용되는 티켓의 종류가 달라진다. 익명의 디지털 티켓이란 일반적인 디지털 티켓의 조건을 만족시키는 동시에 티켓 소유자에 대한 익명성을 보장하는 디지털 티켓을 말한다. 익명의 디지털 티켓은 전자 화폐와 유사한 특성을 갖지만, 액수에 대한 정보를 노출시키지 않아야 한다는 점에서 차이를 가진다. 본 논문에서는 은닉 서명과 일 방향 함수를 이용하여 n번 사용 가능한 익명의 디지털 티켓 문제에 대한 프로토콜을 설계하고 이에 대한 안전성을 보인다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2022.07a
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• pp.547-548
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• 2022

본 논문에서는 디지털 노마드들이 활동하는 인터넷 환경에서 좀 더 진화된 형태의 메타버스 플랫폼 환경에서는 물론 컴퓨터를 활용한 디지털 환경에서 적응하며 블록체인이나 NFT와 같은 가상화폐, 가상자산과 함께 융합 발전하고 있다. MZ세대 중에서 컴퓨터를 활용하는 그래픽 아티스트들의 디지털 아트활동과 좀 더 발전된 형태의 NFT아트로의 융합 발전에 대해 알아보고 디지털 노마드를 넘어 디지털 네이티브로 진화한 이러한 디지털 창작활동을 하는 아트직군의 크리에이터들이 향후 어떻게 발전하게 될지 후속 연구 방향성을 제시한다.

• The Journal of the Korea Contents Association
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• v.20 no.10
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• pp.615-629
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• 2020

Conducting Focus Group Interview (FGI), this study examined the roles and discourses of cryptocurrency's online communities and media (legacy media and YouTube), and based on this, the study proposed the direction of cryptocurrency policy. By reviewing previous literature, this study analyzed the characteristics of investors, the online community, and YouTube, which is an investment environment factor. The study figured out the purpose of use and role of the community via interviews with cryptocurrency professional investors and online community members and analyzed main discussion themes of the five top-ranked YouTube channels related to cryptocurrency with the highest number of subscribers. The results suggested that cryptocurrency's investment was led by those who are in their 20s and 30s, the investors preferred and trusted information on new media than legacy media. The online community played the role of emotional homogeneity and empathy, and YouTube mainly performed the informational role. As a result of discourse analysis and interviews, this study argued that the legal stability of cryptocurrency's policy and protection of individual investors are needed. This study's significance indicates that it used various research methods such as literature research, interviews, content analysis of community/YouTube to analyze the informational role and emotional aspects of new media and suggested policy direction of the digital new deal blockchain technology and the fairness of financial industry.

• Information Systems Review
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• v.23 no.3
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• pp.177-200
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• 2021

Recently, the use of prepaid electronic payments such as electronic wallets, digital currency and prepaid points is gradually increasing. Prepaid electronic payments has the characteristic of being used after charging first. This study empirically investigated the factors affecting the intention to use online charging in order to help improve the service that require prepaid recharge by applying transformed TAM. Since there are not many previous studies for the intention to use online charging, we extract factors through preceding researches for electronic cash and mobile easy payment. Also we analyze the intention to use online charging for transportation card users, focusing on the moderating effects. As a result of the study, it was found that 'convenience', 'ubiquity', and 'self-efficacy' among the independent variables had a positive (+) effect on mediation variable 'perceived usefulness'. 'Perceived usefulness' was analyzed to have a significant influence on the dependent variable 'usage intention'. According to users' gender, internet usage time, internet shopping frequency, online charging frequency and transportation card usage type, the moderating effect was significant on 'perceived usefulness' and 'usage intention'. As an implication, it was suggested that service improvement and differentiated marketing are needed in direction of increasing the usefulness of services. Additional research directions were proposed for services such as e-wallets, prepaid points and digital currencies by adding other factors and moderate variables.

• The Journal of the Korea Contents Association
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• v.21 no.9
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• pp.360-371
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• 2021

The advent of virtual currencies has heightened interest in the Central Bank Digital Currency (CBDC) issued by the central bank. Recently, central banks in some countries have already decided to issue CBDCs or are in the test phase. This study will be an opportunity to compare public and private perceptions of central banks and explore various issues related to the introduction of CBDCs in the future through analysis methods of big data.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.33 no.2
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• pp.139-149
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• 2023

CBDC has characteristics similar to e-payments in which all records are kept by logs, so it is difficult to satisfy the anonymity level of cash. Therefore, in this study, the CBDC model that encrypts all transaction contents using the Diffie-Hellman key sharing algorithm was presented to enhance anonymity. The proposed model provides unlinkability anduntraceability. In addition, a CBDC certificate that uses pseudonym is used. Through this certificate, illegal transactions that require tracking can be tracked later by authorized institutions.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.2
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• pp.585-594
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• 2018

Virtual currencies have emerged along with new technologies such as block chain, artificial intelligence (AI), and big data. This study examines the benefits of a security-enhanced block chain resulting from individual trading, decentralized from governments, as well as the problems associated with misuse of virtual currencies. Virtual currencies, due to its anonymity, is vulnerable to financial crimes, such as ransom-ware, fraud, drug trafficking, tax evasion and money laundering. Use of virtual currencies can facilitate criminals avoid detection from investigative agencies. Government regulatory policy continues to address these concerns, and the virtual currency exchange has also announced a self-regulation proposal. However, a fundamental solution remains necessary. The purpose of this paper is to investigate the problems regarding abuse of virtual currency and to identify a practical system for transactions involving virtual currencies. However, in order to promote transactions involving virtual currencies and to institutionalize a governance system, multilateral cooperation is required. Although the restricting the use of virtual currencies regarding minors and foreign trade, as well as the introduction of a real-name system are considered promising prospects, many problems remain. Virtual currency is not a simple digital item but a method of redesigning the function of money. Coordinated efforts are needed globally to be able to further activate the positive aspects concerning the use of virtual currencies.

• 한국벤처창업학회:학술대회논문집
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• 2018.04a
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• pp.31-34
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• 2018

비트코인과 같은 암호화폐에 대한 높은 관심을 시작으로 블록체인 기술이 대중에 널리 알려지기 시작했다. 블록체인 기술이 가진 장점을 살려 블록체인 기술에 기반한 다양한 서비스들이 출시되고 있다. 2017년 11월, 이더리움에 기반한 크립토키티(cryptokitties)라는 디지털 수집품이 출시되었다. 사용자는 크립토키티를 통해 교배가 가능한 디지털 고양이를 이더리움을 사용해 구매할 수 있다. 본 연구에서는 블록체인 기술에 기반한 이 독특한 디지털 수집품 서비스를 사용하는 사용자들의 행동패턴에 대해 알아본다.

• Journal of Korea Multimedia Society
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• v.8 no.7
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• pp.988-999
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• 2005

As the Internet continues to have the commercial trade changed, the method of payment is one of critical components to conduct successful businesses through the internet. An electronic cash has all of the characteristics of a traditional commodity cash and ensures the security for all transactions. Accordingly an internet billing system based on the electronic cash is expected as the secure and efficient payment method for the future electronic commerces. The digital contents such as digital merchandise and services have the characteristic that both the delivery of merchandise and the payment of money can be accomplished on the same network and are helpful to idealize the design of the electronic commerce system. In this paper, Anonymity got to be possible by using a virtual ID in the process of payment, the payment steps were decreased by being processed on the same network, and the efficiency and the security were guaranteed by decreasing the frequency of the coding and communication.