• Proceedings of the Korea Information Processing Society Conference
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• 2020.05a
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• pp.52-55
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• 2020

본 논문에서는 분산 원장의 미들웨어 플랫폼으로 예상되는 블록체인 시스템의 실질적인 운영과 관련하여 블록체인 그룹 구조의 단점에 대하여 연구하고 이를 해결하기 위한 해결책으로 현재 ISO/IEC JTC1 SC6 에서 표준화가 진행중인 만물 네트워크 프로토콜의 사물 유저 소셜 그룹 관리기능을 이용한 블록체인의 운영 방법을 제시하였다. ISO/IEC JTC1 SC6 에서 표준화가 진행중인 만물네트워크의 사물 유저 소셜 그룹 관리기능은 안정적인 프로토콜 기능과 데이터 전송 관리를 제공하고 있으며 멤버 디스커버리기능, 데이터 전송 통로 관리기능 등의 그룹 관리 기능을 제공하고 있다. 이러한 기능을 블록체인 플랫폼에 활용할 수 있어서 블록체인 멤버 관리 및 그룹 관리 기능에 도움이 될 것으로 예상하며 표준화가 진행되고 있는 ISO/IEC JTC1 SC6 의 미래 네트워크 기능과 구조에 적극 반영하고자 한다.

• KIPS Transactions on Software and Data Engineering
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• v.9 no.11
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• pp.332-338
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• 2020

The blockchain contains potential to contribute for the development of education, teaching and learning as it provides the basic technologies which can handle the data transparently and stably in reliability. Especially, blockchain technology can guarantee the transparency, stability and reliability on the data especially in managing longitudinal education data. This study designed the Badgechain service platform combining badges and blockchains. This service consists of Badgechain solution, Moodle LMS linked to Badgechain added with Badgechain service as a learning activity, and Badgechain Wallet site where badges issued by various agencies can be viewed and managed. This study was performed as a basic study on educational use of blockchain.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.29 no.2
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• pp.309-320
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• 2019

Blockchain has been developed as a key technology for many cryptocurrency systems such as Bitcoin. These days, blockchain technology attracts many people to adopt it to various fields beyond cryptocurrency systems for their information sharing and processing. However, with the development and increasing adoption of the blockchain, security incidents frequently happen in the blockchain systems due to their implementation flaws. In order to solve this problem, in this paper, we analyze the software vulnerabilities of Bitcoin and Ethereum, which are the most widely used blockchain applications in real world. For that purpose, we conduct an in-depth analysis of source code of them to detect software vulnerabilities, and examine an OS command injection attack exploiting the detected ones.

• Proceedings of the Korean Society of Computer Information Conference
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• 2020.07a
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• pp.37-40
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• 2020

최근 블록체인이 활성화되면서 블록체인 시장 및 블록체인 모델의 활용도가 늘어나고 있다. 그중 하이퍼레저 패브릭은 프라이빗 블록체인의 대표적인 플랫폼이다. 하이퍼레저 패브릭에서 클라이언트는 트랜잭션을 보증 피어에게 전송할 때 사전에 정해진 보증 피어에게만 전송한다. 이는 트랜잭션의 실행 비용 및 보증 피어의 성능을 고려하지 않아 보증 시간을 증가시키는 문제가 발생한다. 본 논문은 이 문제를 해결하기 위해 트랜잭션의 실행 비용에 따라 효율적으로 보증 피어를 라우팅하는 기법을 제안한다.

• Smart Media Journal
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• v.12 no.2
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• pp.76-82
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• 2023

In the 4th industrial revolution, the blockchain that distributes and manages data through a P2P network is used as a new decentralized networking paradigm in various fields such as manufacturing, culture, and public service. However, with the advent of quantum computers, quantum algorithms that are able to break existing cryptosystems such as hash function, symmetric key, and public key cryptography have been introduced. Currently, because most major blockchain systems use an elliptic curve cryptography to generate signatures for transactions, they are insecure against the quantum adversary. For this reason, the research on the quantum-resistant blockchain that utilizes lattice-based cryptography for transaction signatures is needed. Therefore, in this paper, we propose a blind signature scheme for the blockchain in which the contents of the signature can be verified later, as well as signing by hiding the contents to be signed using lattice-based cryptography with the property of quantum resistance. In addition, we prove the security of the proposed scheme using a random oracle model.

• Journal of Korea Society of Industrial Information Systems
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• v.28 no.2
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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.

• Journal of Digital Convergence
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• v.17 no.10
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• pp.67-75
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• 2019

As 4th industrial revolution has emerged as a hot topic, the blockchain technology capable of enabling super intelligence as a premiere has been an attracting attention. With the interest in blockchains, various platforms using blockchains are emerging. Reflecting this trend, several countries including US, EU, China, and Japan are preparing blockchain and related laws or amending existing laws. In Korea, the platform business based on blockchain is being done, but the related laws are insufficient. In this study, we first present the legal system of the blockchain, examine each component, and then compare the current state of the legal system in US, EU, China, and Japan based on the blockchain legal system. Finally, we propose a brief improvement plan of the legal system for industrial development by commercialization of blockchain. In the future, we would like to study the individual legal system about the blockchain.

• The Journal of the Korea Contents Association
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• v.18 no.7
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• pp.620-627
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• 2018

With the widespread adoption of blockchain in the field of business, the importance of confidentiality of critical information has been emerging. Although blockchain models solve the security problem regarding integrity threat by sharing transactions and making them public, it is vulnerable in terms of confidentiality. Therefore, a security mechanism to provide confidentiality of critical information and private information of a firm is necessary to utilize block chain in the process of work. In order to solve the problem, we suggest Private blockchain based cryptographic protocol application model using Smart contract commitment scheme of the Ethereum. It can contribute to activation of blockchain services by enabling non-trusted participants to perform businesses through application of smart contract enhanced in terms of confidentiality and integrity to private blockchain.

• Management & Information Systems Review
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• v.38 no.1
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• pp.83-101
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• 2019

Blockchain is considered as an innovative technology along with Artificial Intelligence, Big Data, and Internet of Things. However, since the inception of the genesis of blockchain technology, the cryptocurrency Bitcoin, the technology is not utilized widely, not let alone disruptive applications. Most of the blockchain research deals with the cryptocurrency, general descriptions of the technology such as trend, outlook of the technology, explanation of component technology, and so on. There are no killer applications like Facebook or Google, of course. Reflecting on the slow adoption by businesses, we wanted know about the current status of the research on blockchain in Korea. The main purpose of this paper is to help business practitioners to identify the application of blockchain to enhance the competitiveness of their organization. To do that, we first use the framework by Iansiti et al (2017) and categorize the blockchain related articles published in Korea according to the framework. This is to provide a benchmark or cases of other organizations' adoption of blockchain technology. Second, based on the value proposition of blockchain applications, we suggest evolutionary paths for adopting them. Third, from the demand pull perspective of technology adoption for innovation, we propose applicable areas where blockchain applications can be introduced. Fourth, we use the value chain model to find out the appropriate domains of blockchain applications in the corporate value chains. And the five competitive forces models is adopted to find ways of lowering the power of forces by incorporating blockchain technology.

• Korean Journal of Construction Engineering and Management
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• v.22 no.1
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• pp.116-124
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• 2021

As the utilization of the BIM model increases in the design and construction stages of a construction project, the utilization of BIM in the maintenance stage can also increase. In the maintenance stage, BIM objects created in the design and construction stages that have already been completed are used. Therefore, it is necessary to verify the reliability of whether the used BIM object is a certified model created in the design stage. In particular, the reliability of the BIM model becomes more important in a project such as railway facilities composed of various construction activities with civil engineering, architecture, electricity, signal, and track work. This study proposes a methodology of using blockchain technology as a way to secure the reliability of the BIM model used in the maintenance phase, and constructs the block structure and detailed process for applying the blockchain technology to BIM. In addition, by applying this process to the BIM model of an actual facility to generate a block, it was confirmed that the blockchain technology can be used as a tool to secure the reliability of the BIM model.