• Journal of Korea Society of Industrial Information Systems
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• v.27 no.4
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• pp.127-136
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• 2022

As technological development continues, platforms with more diverse structures are emerging. Existing research predicts that a new structure based on technology and innovation will affect the two-sided market. This study evaluated the decentralized identifier (DID) platform, a new platform based on blockchain technology, of the importance of this platform from the perspective of the two-sided market. Using the Analytic Network Process, IT, platform, and blockchain experts conducted a dual comparison survey. Data with a consistency ratio value of 0.1 or less were selected and analyzed for 12 data. The research results showed the importance of service quality, policy support, openness, and uncertainty. This study is expected to be used to support the development of strategic decision-making for blockchain and DID platform-based business companies.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.31 no.6
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• pp.1115-1126
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• 2021

In this paper, we developed a mobile student ID providing a self sovereignty identity (SSI) which replaces the conventional plastic-type student ID that includes private information of a student such as a name, a student number, a facial photo, etc. The implemented mobile student ID solves the problem of exposing student's identity due to a loss or a theft of a plastic-type student ID, and it has a structure and process of FRANCHISE model which is developed by a concept of a decentralized Identity(DID) of a Blockchain, in which specialized for convenience as an electronic student ID through an application on a smart phone device. In addition, it protects student's privacy by controlling personal information on oneself. By using a smartphone, not only it easily identifies the student but also it expands to several services such as participation in school events, online authentication, and a student's exchange program among colleges.

• 한국HCI학회:학술대회논문집
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• 2009.02a
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• pp.232-239
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• 2009

Emerging social networking services provide a new paradigm for human-to-human communication. However, these services are centralized and managed by single service provider. In this paper, we propose MicroPost, a decentralized event notification service architecture for social applications based on publish/subscribe model. In our design space, event brokers are structured as an overlay network which provides the substrate of distributed peer-to-peer lookup service for storing and retrieving subscriptions with hashed keys. Event clients interact with event brokers to publish or subscribe social messages over the wide-area network. Using XML standards, we present an efficient algorithm to forward events for rendezvous-based matching in this paper. In our design space, the cost of routing is O(${\omega}log_kN$), where N is the number of event brokers, ${\omega}$ is the number of meta-data obtained from event messages, and k is a constant, which is selected by our design, to divide the identifier space and to conquer the lookup of given key. Consequently, what we achieved is an asynchronous social messaging service architecture which is decentralized, efficient, scalable, and flexible.

• Smart Media Journal
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• v.12 no.3
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• pp.60-67
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• 2023

Hyperledger Indy is an open-source implementation of DID, a decentralized identity verification technology. Hyperledger Indy uses the RBFT consensus algorithm, and if there is a lack of consensus with more than a certain number of problem nodes in the pool, data is not added. This problem can be prevented in advance by adding a node, and a node monitoring system was implemented to operate automatically. The node monitoring system continuously checks the status of the pool and automatically adds nodes when there are more than a certain number of problematic nodes to prevent consensus problems from occurring. This proposed method can increase the availability of Hyperledger Indy and is a study that can be referenced in various blockchain services that use consensus algorithms.

• Proceedings of the Korea Information Processing Society Conference
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• 2022.05a
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• pp.217-220
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• 2022

디지털 전환 시대를 맞아 일상생활 대부분이 온라인으로 이동하면서 온라인상에서 자신을 나타내는 신뢰할 수 있는 신분증의 필요성이 커지게 되었다. 신원 확인 방법은 중앙 집중식 모델에서 현재는 자기주권신원 모델로 변화하는 과정에 있으며 사용되는 핵심 기술은 탈중앙 식별자 DID(Decentralized Identifier)이다. DID는 기존 신원 체계와 달리 개인의 데이터 소유권을 개인에게 돌려줘 데이터 주권을 지킬 수 있게 해줌으로써 개인의 정보 공유 범위를 결정하는 SSI(Self Sovereign Identity)를 실현하는 기술이다. DID를 이용하면 데이터의 무결성, 투명성을 보장하는 자격 증명(Verifiable Credential, Verifiable Presentation) 발급이 가능하며 이를 검증하는 데이터는 모두 블록체인에 올라가 있는 것이 특징이다. 본 논문에서는 실제 서비스와 유사한 시뮬레이션 환경을 구축하여 자격 증명의 사용자 프라이버시를 보호하는 방법인 BBS+서명 기법에 대해 알아보고자 한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2021.11a
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• pp.355-358
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• 2021

개인의 신원정보 보호에 대한 중요성이 높아지면서 개인이 직접 자신의 신원정보를 관리하고 데이터의 주권을 신원정보 소유자에게 부여하는 자기주권 신원 시스템에 대한 관심이 높아지고 있다. 자기주권 신원 시스템 내에서 개인은 스스로 자신을 식별할 수 있는 분산 식별자(DID: decentralized identifier)를 생성하고 분산 식별자 별 개인의 자격을 증명해주는 자격증명(VC: verifiable credentials) 정보를 발급받아 개인이 보유하며 자격증명의 검증을 요구하는 검증자에게 선택적으로 자격증명 정보를 제시한다. 개인의 프라이버시를 보호하기 위해 개인의 자격증명을 제시할 때 신원정보의 실제 데이터는 감추고 자격증명의 유효성은 입증시키는 영지식 증명의 개념을 적용하고 있다. 본 논문에서는 영지식 증명 기술을 살펴보고 하이퍼레저 인디(Hyperledger Indy) 기반 자기주권 신원 시스템에서 영지식 증명 기술 도입 예를 보인다.

• Proceedings of the Korea Information Processing Society Conference
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• 2023.11a
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• pp.210-211
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• 2023

디지털 신원은 온라인 환경에서 빠르게 중요해지고 있으며, 그 관리의 중요성은 날로 커지고 있다. 중앙화된 신원 관리 시스템의 한계를 인식하며, 탈중앙화된 신원 관리 시스템인 DID(Decentralized Identifier)에 대한 연구와 관심이 확대되고 있다. 그럼에도 불구하고, DID 활용 시 개인정보 유출의 리스크는 여전히 남아 있다. 이러한 문제를 해결하기 위해, 본 연구는 일회용 DID 기법을 제시하였고, 해당 기법은 사용자의 비연결성을 향상시키며, 키 유출과 관리 문제를 최소화한다. 본 연구를 통해, 일회용 DID가 비연결성 강화, 키의 안전한 관리 등의 이점을 제공함을 확인하였다.

• Journal of Korea Society of Industrial Information Systems
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• v.28 no.5
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• pp.41-54
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• 2023

Smart grid that supports efficient energy production and management is used in various fields and industries. However, because of the environment in which services are provided through open networks, it is essential to resolve trust issues regarding security vulnerabilities and privacy preservation. In particular, the identification information of smart meter is managed by a centralized server, which makes it vulnerable to security attacks such as device stolen, data forgery, alteration, and deletion. To solve these problems, this paper proposes a blockchain based authentication protocol for a smart meter. The proposed scheme issues an unique decentralized identifiers (DIDs) for individual smart meter through blockchain and utilizes a random values based on physical unclonable function (PUF) to strengthen the integrity and reliability of data. In addition, we analyze the security of the proposed scheme using informal security analysis and AVISPA simulation, and show the efficiency of the proposed scheme by comparing with related work.

• Journal of Korean Society of Archives and Records Management
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• v.20 no.4
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• pp.81-105
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• 2020

This study examines the possibility of applying various recordkeeping methods through a platform built in 2019 by the National Archives of Korea. In particular, it aims to develop a way to track and store transactions using blockchain and to design and present the method of records management automation using smart contracts. In this regard, a literature review, a system analysis of CAMS and MAM, interviews with the experts, designing, implementation, and the development of the system's proof of concept were performed. These efforts resulted in the proposal of an archives and records management strategy utilizing blockchain, which guarantees transparency and accountability by preserving an audit trail on recordkeeping activities.

• Journal of Industrial Convergence
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• v.20 no.9
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• pp.47-58
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• 2022

Digital content is difficult to distinguish between the original and the replica due to its nature. For this reason, NFT technology using blockchain technology is attracting attention because it can guarantee the proof and scarcity of the original digital content. However, the NFT buyer does not own the copyright to the digital content, but the ownership. In particular, since the minting process of issuing NFTs is possible for anyone, there is a copyright threat to the copyright holder. In this study, we propose a verification protocol based on DID for the process of issuing and transacting NFTs for copyright protection of copyright holders' digital contents. As a research method, the problems of research cases related to digital contents were analyzed and the safety was comparatively analyzed. NFT issuance can only be issued by copyright holders whose identity has been verified through DID, and only users who have completed authentication can participate in the transaction to prevent indiscriminate theft and use of digital content and form a safe and transparent transaction market.