• Title, Summary, Keyword: 블록체인

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Protection Technologies against Large-scale Computing Attacks in Blockchain (블록체인에서 대용량 컴퓨팅 공격 보호 기술)

  • Lee, Hakjun;Won, Dongho;Lee, Youngsook
    • Convergence Security Journal
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    • v.19 no.2
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    • pp.11-19
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    • 2019
  • The blockchain is a technique for managing transaction data in distributed computing manner without the involvement of central trust authority. The blockchain has been used in various area such as manufacturing, culture, and public as well as finance because of its advantage of the security, efficiency and applicability. In the blockchain, it was considered safe against 51% attack because the adversary could not have more than 50% hash power. However, there have been cases caused by large-scale computing attacks such as 51% and selfish mining attack, and the frequency of these attacks is increasing. In addition, since the development of quantum computers can hold exponentially more information than their classical computer, it faces a new type of threat using quantum algorithms. In this paper, we perform the security analysis of blockchain attacks composing the large computing capabilities including quantum computing attacks. Finally, we suggest the technologies and future direction of the blockchain development in order to be safe against large-scale computing attacks.

A Study on the Application of Block Chain Technology on EVMS (EVMS 업무의 블록체인 기술 적용 방안 연구)

  • Kim, Il-Han;Kwon, Sun-Dong
    • Management & Information Systems Review
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    • v.39 no.2
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    • pp.39-60
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    • 2020
  • Block chain technology is one of the core elements for realizing the 4th industrial revolution, and many efforts have been made by government and companies to provide services based on block chain technology. In this study we analyzed the benefits of block chain technology for EVMS and designed EVMS block chain platform with increased data security and work efficiency for project management data, which are important assets in monitoring progress, foreseeing future events, and managing post-completion. We did the case studies on the benefits of block chain technology and then conducted the survey study on security, reliability, and efficiency of block chain technology, targeting 18 block chain experts and project developers. And then, we interviewed EVMS system operator on the compatibility between block chain technology and EVM Systems. The result of the case studies showed that block chain technology can be applied to financial, logistic, medical, and public services to simplify the insurance claim process and to improve reliability by distributing transaction data storage and applying security·encryption features. Also, our research on the characteristics and necessity of block chain technology in EVMS revealed the improvability of security, reliability, and efficiency of management and distribution of EVMS data. Finally, we designed a network model, a block structure, and a consensus algorithm model and combined them to construct a conceptual block chain model for EVM system. This study has the following contribution. First, we reviewed that the block chain technology is suitable for application in the defense sector and proposed a conceptual model. Second, the effect that can be obtained by applying block chain technology to EVMS was derived, and the possibility of improving the existing business process was derived.

Science Mapping Analysis for Blockchain by using R Package (R 툴을 이용한 블록체인 기술의 사이언스 매핑 분석)

  • Noh, Kyung-Ran;Kwon, Oh-Jin;Moon, Yeong-Ho;Sohn, Eun-Soo
    • Proceedings of the Korea Contents Association Conference
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    • pp.397-398
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    • 2018
  • 이 연구의 목적은 블록체인 기술에 관한 최신 연구동향을 살펴보는 것이다. 2010년 이후 블록체인 기술에 관한 연구가 급증하고 있다. 블록체인 기술 연구분야와 관련하여 가장 생산적인 연구자와 국가를, 많은 논문을 발표한 학술지를 탐지하고자 한다. 블록체인 기술 연구와 관련하여 가장 관련있는 키워드들을 밝혀내고자 한다. 여러 관점에서 블록체인기술 연구에 대한 빅픽쳐를 제공하고자 한다.

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Proposal of A Transaction Structure to Improve Compatibility of Blockchain regarding Post-Quantum Digital Signatures (블록체인의 양자 내성 전자서명 호환성을 증대하기 위한 트랜잭션 구조 제안)

  • Kim, Mee Yeon;Lee, Jun Yeong;Yoon, Kisoon;Youm, Heung Youl
    • Journal of the Korea Institute of Information Security & Cryptology
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    • v.30 no.1
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    • pp.87-100
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    • 2020
  • Researches on Post-quantum blockchain, which is a synthesis of blockchain and post-quantum cryptography[1], are relatively unrevealed areas but have needs to be studied with the regard to the quantum computers. However there could be several fundamental problems, e.g. unsustainably large size of public key and signature, or too lengthy time for sign and verification, if any post-quantum cryptography is adopted to the existing blockchain to implement post-quantum blockchain. Thus, a new method was proposed in this paper that produces fixed length of references for massive signatures and corresponding public keys to enable relatively lightweight transactions. This paper proposed the mechanism that included a new transaction structure and protocols, and demonstrated a post-quantum blockchain that the proposed mechanism was adopted. Through this research, it could enhance compatibility of blockchain regarding post-quantum digital signature, possibly reducing weights of the whole blockchain.

A Study on the Blockchain-based System Authentication Method (블록체인 기반 시스템 인증 방법에 대한 연구)

  • Kim, Sunghwan;Kim, Younggon
    • The Journal of The Institute of Internet, Broadcasting and Communication
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    • v.20 no.1
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    • pp.211-218
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    • 2020
  • Recently, with the advent of blockchain technology, attempts to apply this technology to existing systems are increasing. By using the blockchain technology consensus ledger and smart contract, it is necessary to distribute certificates to various fields that require documents, attestation, authentication, verification, etc. We are studying methods using hash operation, blockchain, etc., but it is difficult to spread the technology as it has not yet reached the stage of commercialization. In this paper, user device registration authentication algorithm, blockchain-based question and answer authentication algorithm, certificate issuance, verification process and encryption algorithm, and server-side authentication for easy application in blockchain based business platform environment We proposed a blockchain-based system authentication method using four algorithms.

An Exploratory Study on the Factors Determining Acceptance of Blockchain-Based Financial Platform by Gender (블록체인 기반 금융 플랫폼의 성별 수용의도 결정요인에 관한 탐색 연구)

  • Kim, Si-Wook;Park, Hyeon-Suk
    • Journal of Digital Convergence
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    • v.18 no.3
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    • pp.139-147
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    • 2020
  • In the fourth revolution resulting from ICT convergence, Blockchain-based platform is being applied to various fields. This trend is expected to become stronger in the future. This study aims to explore several factors pertaining to user acceptance of Blockchain-based financial platform. It is important for finance business managers and blockchain technical managers to verify the user's willingness to accept the blockchain. In this study, the factors determining the acceptance of blockchain-based platform we explore are innovation, convenience, security and preference. Based on the results of the survey, 465 users(male 262, female 212) completed the questionnaire, a structural equation analysis was used in order to analyze the blockchain's users acceptance framework. Through the results we were able to identify and validate the differences in innovation and convenience by gender as well as the factors determining the acceptance of blockchain-based financial platform.

Study on Improvement and Correlation of Blockchain and Right to be Forgotten (잊혀질 권리와 블록체인의 상관관계 및 개선방안 연구)

  • Heo, Jae-Wook;Kim, Sung-Soo;Kang, Jeong-Ho;Jun, Moon-Seog
    • Proceedings of the Korea Information Processing Society Conference
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    • pp.231-234
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    • 2018
  • 4차 산업혁명을 주도하는 신기술인 블록체인은 블록체인 네트워크에 속한 모두가 신뢰성을 가질 수 있는 새로운 형태의 탈중앙화 P2P 플랫폼이다. 2018년 기존 개인정보 보호 지침을 대체하는 GDPR이 발효되어 다양한 부분의 개인정보 보호에 법적인 영향을 미치게 되었다. 블록체인 또한 GDPR의 법적 규제를 피할 수 없게 되었고, 블록체인에서 잊혀질 권리를 충족시키기 위해 정보주체의 요청 시 민감한 개인정보를 삭제할 수 있어야 하는 필요성이 요구되었다. 본 연구에서는 기존 블록체인 시스템에서 잊혀질 권리를 준수할 개선방안을 제안한다.

사물인터넷 서비스 연동을 위한 블록체인 아키텍처

  • Choi, Jongseok;Heo, Shinwook;Kim, Howon
    • Review of KIISC
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    • v.28 no.5
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    • pp.20-25
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    • 2018
  • 본 논문에서는 사물인터넷 서비스와 블록체인 플랫폼간의 연동을 위한 아키텍처를 제안한다. 블록체인은 다양한 산업분야에서 데이터 신뢰성 및 안전성 측면에서의 효율성을 제공한다. 반면에 데이터 쓰기 및 읽기에 대한 낮은 성능 때문에 실제 서비스 적용하기 어렵다. 특히 사물인터넷 서비스와 같은 다량의 데이터가 발생하는 분야에서는 블록체인을 실질적으로 적용하기 어렵지만, 사물인터넷은 프라이버시 및 데이터 보안 측면에서 많은 보안 문제를 야기할 수 있는 분야로써, 블록체인을 통한 데이터 추적 및 신뢰성 보안을 필수적으로 요구된다. 본 논문에서는 이와 같이 실시간성과 신뢰성을 보장하기 위한 사물인터넷 연동형 블록체인 플랫폼 아키텍처를 소개한다. 실시간성을 유지하기 위해서 단일 피어 검증을 통한 실시간 데이터 관리를 활용하며, 신뢰성 유지를 위해서 합의를 통한 분산원장을 활용한다. 단일 피어 검증 데이터는 합의 과정을 거치기 이전에 데이터를 수신받은 단일피어가 분산원장과 별도의 상태 데이터베이스를 통해 실시간 데이터를 저장하여 실시간 서비스에 제공한다.

Blockchain Beyond Bitcoin (비트코인 후 블록체인)

  • Hong, S.Y.;Cho, S.R.;Kim, S.H.
    • Electronics and Telecommunications Trends
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    • v.32 no.1
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    • pp.72-81
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    • 2017
  • 2008년, Satoshi Nakamoto라는 가명을 쓰는 신원미상의 사람(들) 혹은 단체가 비트코인을 소개하였다. 그 이후, 현재 비트코인의 총액은 10억달러 이상에 달한다. 비트코인을 지탱하는 기술인 블록체인에 의해 이론적으로 비트코인은 거의 조작이 불가능하며 거의 영구적으로 기록에 남게 된다. 이 획기적인 기술로 인해 비트코인 이 후 약 700개가 넘는 암호화폐가 생겨났으며, 암호화폐뿐만이 아닌 금융권/비금융권, 정부기관 등 많은 도메인에서 블록체인 기술이 도입되어 가고 있다. 비트코인 이후 가장 대표적인 블록체인 기반의 프로젝트로는 튜링 완전한 컴퓨팅 기능이 있는 이더리움이 있다. 이 튜링 완전한 컴퓨팅 기능으로 인해 이더리움 상에서 투명하게 데이터 저장 및 프로그램 실행을 할 수 있다. 이로 인해 이더리움을 이용한 많은 혁신적인 이용 사례가 생겨났다. 본고에서는 비트코인 후 블록체인의 기술을 이더리움 중심으로 소개하며 해결해야 할 기술적 이슈들과 동향에 관해 분석한다. 그리고 현재 이더리움 외에 개발되어오는 블록체인에 대해 간략히 살펴본다.

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Trends of Block Chain Cryptography in Wireless Mobile Security Environments (무선모바일 보안 환경에서 블록체인 암호기술의 동향)

  • Hong, Dong-sung;Cho, Young-bok
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.67-70
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    • 2019
  • Blockchain, which emerged with the development of IT technology, has emerged as a new technology in security in recent years, although it has only been known as a technology associated with digital currencies, such as bitcoin. In particular, various studies have been conducted involving biometric technology and blockchain in the security of the mobile environment, and blockchain-based certifications between different devices are also presented in the IoT base of the wireless mobile environment. In this paper, we want to analyze the trends that are currently being applied to various wireless mobile environments and set up guidelines for future blockchain research.

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