• Journal of Korea Society of Industrial Information Systems
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• 제28권2호
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• pp.47-60
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• 2023

This study proposed to adopt consortium blockchain for the database in the research support system of national R&D projects in order to increase efficiency, to reduce administrative burden, and to promote transparent research environment focusing on servicing researchers. Specifically, storage methods were classified according to data characteristics. First, data that requires integrity and transparency is stored in the blockchain, Second, confidentiality and data that require modification and deletion are stored in the database, Third, data that requires confidentiality, integrity, and transparency at the same time stores the original in the database, and the hash value of the data is separately stored in the blockchain. If research support system adopts blockchain, it is possible to operate the system stably, to share quick exchange of information between research institutes, to reduce administrative burden, to improve transparency of process, to resolve asymmetry of information, and to secure integrity, confidentiality, and availability of data.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• 제20권1호
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• pp.55-60
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• 2020

In this paper, we propose an access control system using cryptography as a method to protect personal data in public blockchain. The proposed system is designed to encrypt data according to the access policy, store it in the blockchain, and decrypt only the person who satisfy the access policy. In order to improve performance and scalability, an encryption mechanism is implemented outside the blockchain. Therefore, data access performance could be preserved while cryptographic operations executed Furthermore it can also improve the scalability by adding new access control modules while preserving the current configuration of blockchain network. The encryption scheme is based on the attribute-based encryption (ABE). However, unlike the traditional ABE, the "retention period", is incorporated into the access structure to ensure the right to be forgotten. In addition, symmetric key cryptograpic algorithms are used for the performance of ABE. We implemented the proposed system in a public blockchain and conducted the performance evaluation.

• Proceedings of the Korea Information Processing Society Conference
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• 한국정보처리학회 2018년도 춘계학술발표대회
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• pp.123-125
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• 2018

본 논문은 블록체인 알고리즘을 탑재한 HEMS 시스템을 활용하여 전력의 생산과 소비를 동시에 수행하는 에너지 프로슈머들 간의 안전하고 신뢰성 있는 전력거래 시스템을 구현하기 위한 방안을 연구하였다. 신재생발전원의 가정내 보급이 증대하고 HEMS를 통해 댁내 에너지관리가 보다 스마트해지고 전력정보의 실시간 취득이 가능해짐에 따라 동일 변대주 인근 배전선로와 연결된 에너지 프로슈머들간의 소규모 전력거래에 있어 블록체인 기반 기술 적용이 보다 용이해 질 것으로 예상된다. 또한, HEMS를 활용하여 블록체인 기반 P2P간의 전력거래에 있어 기술적 한계를 극복하기 위한 추가적인 연구 방향을 함께 제시하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 한국정보처리학회 2022년도 춘계학술발표대회
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• pp.256-259
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• 2022

BaaS(Blockchain as a Service)는 블록체인의 사용이 어렵다는 단점을 유연한 자원운용이 가능하고 뛰어난 접근성의 특징을 가진 클라우드와 접목하여 쉽게 블록체인을 구축하고 사용할 수 있도록 해주는 클라우드 서비스이다. BaaS 의 등장으로 블록체인의 접근성은 큰 범위로 증가하였으며 다양한 도메인에 활용되고 있다. 하지만 클라우드 기반 서비스이기 때문에 클라우드 서비스의 문제점인 보안 이슈가 제기되었다. 본 논문에서는 BaaS 에 ZKP(Zero-Knowledge Proof)와 엣지 컴퓨팅 기술을 활용하여 보안성을 제공할 수 있는 새로운 BaaS 모델인 EBaaS 를 제안한다. EBaaS 는 엣지 컴퓨팅 기술을 적용하여 클라우드 서비스 공급업체에 대한 데이터 종속성을 제거하고 블록체인의 고가용성을 제공할 수 있으며 ZKP 를 활용하여 내부적으로 민감한 데이터에 대한 보안성도 제공할 수 있다.

• Journal of Software Engineering Society
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• 제29권2호
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• pp.7-12
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• 2020

A project to establish an information system with a project cost of more than 500 million won at a local public firm is subject to the Information System Audit (hereinafter referred to as IS Audit), and the IS Auditor shall conduct audit according to the audit criteria. Recently, as blockchain technology has been applied to various fields such as manufacturing, healthcare, distribution, and public sectors beyond the financial industry, the development of systems that apply blockchain technology is increasing. The use of Hyperledger Fabric, a private blockchain, is on the rise to utilize blockchain technology in public firms and private firms. However, the newly emerging blockchain-based system is not sufficient to carry out auditing with existing audit check items, so it has no choice but to make and use audit items individually. Therefore, a need for verified audit items for systems that base on blockchain technology has emerged. In this study, we customized the Delphi process to derive audit items suitable for the system development project using the blockchain technology, and verified the completeness and accuracy of the audit items derived through a survey by the IS Auditor. This research will be of direct help to the IS Auditor, and it is expected that operators and organizers who provide services through the blockchain-based system will also contribute to improving the quality of the system.

• Information Systems Review
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• 제23권3호
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• pp.97-125
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• 2021

Blockchain is a core technology to solve personal information leakage and data management issues, which are limitations of existing Genomic Sequencing services. Due to continuous cost reduction and deregulation, the market size of Genomic Sequencing has been increasing, also the potential of services is expected to increase when Blockchain's security and connectivity are combined. We created our research model by combining the Technology Acceptance Model (TAM) and the Innovation Resistance Theory also analyzed the factors affecting the acceptance intention and innovation resistance of the Blockchain Based Genomic Sequencing Information Platform. A survey was conducted on 150 potential users of Blockchain and Genomic Sequencing services. The analysis was conducted by setting the four Blockchain variables: Security, transparency, availability, and diversity). Also, we set the Perceived Usefulness, Perceived risk, and Perceived Complexity for Technology Acceptance and Innovation Resistance variables and analyzed the effect of the characteristics of the Blockchain on acceptance intention and innovation resistance through these variables. Through this analysis, key variables that need to be considered important to reduce resistance and increase acceptance intention could be identified. This study presents innovation factors that should be considered in companies preparing a new Blockchain Based Genomic Sequencing Information Platform.

• Proceedings of the Korean Society of Computer Information Conference
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• 한국컴퓨터정보학회 2021년도 제64차 하계학술대회논문집 29권2호
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• pp.111-112
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• 2021

비대면 사회 확산에 따라 디지털 콘텐츠 등 온라인상으로 거래가 관리되는 디지털 자산의 거래가 증가하고 있다. 영상 및 이미지 등 디지털 자산의 경우 창작자가 자산에 대한 충분한 대가를 받지 못하고 불법 거래 내역에 대한 파악이 어렵다. 본 논문에서는 NFT적용을 통한 효율적 디지털 자산 관리를 위하여 신뢰성과 보안을 강화한 블록체인 합의알고리즘을 연구하고 성능평가를 통하여 기존 합의알고리즘 대비 우수성을 증명하였다.

• Journal of Food Hygiene and Safety
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• 제34권5호
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• pp.489-494
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• 2019

The appropriateness of introducing blockchain technology into food safety management systems was evaluated by conducting a survey of experts on the effectiveness and constraint evaluation indicators, and a portfolio analysis was conducted to set the priorities of blockchain application. The food safety management activities considered in this study were issuing documents on food import/export, food hygiene rating scheme, civil complaint management in the food sector, food- related certification, risk information management, and food traceability systems. The sectors that can be expected to be effective in the introduction of blockchain technology were food- related certification, food hygiene rating scheme, risk information management, and issuing documents on food import/export. In the case of food traceability systems and civil complaint management, the introduction of blockchain technology was not recommended due to ineffectiveness. From the evaluation of the constraints (e.g., technical limits, cost, legal amendment, personal information disclosure, timeliness, and ease of connection) to be overcome when introducing blockchain into food safety management, it was found that there are more than average constraints in all six areas. In particular, the food traceability system was evaluated to have the most constraints. Issuing documents on food import/export is very effective with the introduction of blockchain technology, but due to high cost and legal restrictions, it is necessary to improve the institutional system in order to introduce blockchain. Among the evaluation sectors, food- related certification, food hygiene rating scheme, and risk information management on foods were suitable for preferentially adopting blockchain technology since these areas might experience greatly improved reliability and transparency through the introduction of blockchain, with relatively low constraints.

• Review of KIISC
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• 제32권2호
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• pp.5-16
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• 2022

수많은 사물들의 센서 정보를 인터넷을 통해 수집하고 분석하여 고객 맞춤형 서비스를 제공하는 사물인터넷 (Internet of Things, IoT) 서비스의 규모와 범위가 점차 확대됨에 따라 그 이점과 함께 사물인터넷이 가진 원천적인 확장성 문제와 개인정보 보안의 취약성 등에 대한 논의가 활발히 진행되고 있다. 최근에는 사물인터넷이 가진 문제점을 극복하기 위한 하나의 도구로써 블록체인을 사물인터넷에 접목하는 방안이 제시되고 있다. 본 고에서는 블록체인을 통해 사물인터넷이 가진 한계점을 극복하고 신뢰성 높은 사물인터넷 서비스를 제공하기 위해 필요한 블록체인의 합의 알고리즘들의 최신 동향에 대해 확인해 보도록 한다.

• The Korean Journal of Archival Studies
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• 제59호
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• pp.47-78
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• 2019

With the rapid changes in the digital technology, it is necessary to shift to a new paradigm corresponding to the changing environment was recognized. This study actively explores the possibility of applying new technologies for recordkeeping. This study aimed to investigate the applicability of blockchain to recordkeeping and to develop a new model for recordkeeping based on it. Through a conceptual analysis of blockchain and consideration of the recordkeeping process, a blockchain model that is suitable for the authentication of records was proposed. For this the network structure, the structure of blockchain blocks, a consensus algorithm, and recordkeeping blockchain model were designed. It also predicted potential changes in digital records management when applying blockchain. It predicted change in governance aspects to implement a horizontal cooperation system among the archives.