• Title, Summary, Keyword: 스마트 컨트랙트

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Secure delivery system on through preventing leakage entrance password. (공동 현관 비밀번호 유출 방지를 통한 블록체인 기반의 안전한 배송 시스템)

  • Kim, Hyun-Ji;Kwon, Yong-Been;Choi, Seung-ju;Seo, Hwa-Jeong
    • Proceedings of the Korea Information Processing Society Conference
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    • pp.127-130
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    • 2020
  • 최근 변화하는 소비패턴으로 인해 당일 및 새벽 배송 등의 서비스가 보편화되고 있다. 해당 서비스는 배송 정보를 입력 시 건물에 자유롭게 출입할 수 있는 공동 현관 비밀번호를 기입해야 한다. 이는 이미 빈번하게 발생하고 있는 무단 주거 침입 등의 범죄에 더 쉽게 노출되도록 할 수 있는 위험 요소이다. 본 논문에서는 신뢰할 수 있는 사용자만이 참여 가능한 프라이빗 블록체인 네트워크에서의 차량 번호판 인식 및 스마트 컨트랙트를 통해 랜덤한 마스터 비밀번호를 제공하여, 보안적으로 취약한 비밀번호 기입 절차를 없애고 검증 받은 사용자에게만 출입을 허가하는 방식을 제안한다.

Implementing Blockchain Based Secure IoT Device Management System (블록체인 기반 안전한 사물인터넷 장치 관리 시스템 구현)

  • Kim, Mihui;Kim, Youngmin
    • Journal of IKEEE
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    • v.23 no.4
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    • pp.1343-1352
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    • 2019
  • To manage the Internet of Things(IoT) Network, which consists of a large number of various devices, a secure and automatic method of strengthening the IoT network is being proposed. Blockchain has a 'smart contract' element of autonomous execution method, which is emerging as a way to not only exchange data quickly without mediators but also securely and automatically manage processes between IoT devices. In this paper, we implement a prototype of the entire IoT device management system based on the EOSIO with DPoS(Distributed Proof of Stake)-based blockchain structure, proposed as a prior study, including the user application DApp(Decentralized Application) and the actual IoT devices (Raspberry Pi-based device, and smart lamp) that interact with the blockchain platform. We analyze the benefits of the system and measure the time overhead to show the feasibility of the system.

The Future of BlockChain Technology Leading Innovation in the Industrial Ecosystem (산업 생태계의 혁신을 선도할 블록체인 기술의 미래전망)

  • Kim, Jung-Sook
    • The Journal of the Korea Contents Association
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    • v.18 no.6
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    • pp.324-332
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    • 2018
  • Blockchain technology has the potential to revolutionize trust models and business processes in a variety of industries. However, it is considered to be the initial stage of the system that pursues autonomy rather than efficiency, and it is necessary to monitor and inspect the distributed ledger technology from the price and introduction time as compared with the existing relational DB transaction technology. However, domestic and foreign private sectors have already been activated by applying block-chain technology in the national domain, and the block chain is devoid of doubt that it is an exaggerated technology, characterized by the invariance of the record, transparency, and autonomous execution of business rules. It has begun to be utilized in history, identity, certification and auditing in the financial industry as well as various industries. In this paper, we analyze the problems such as security weakness, insufficient regulatory environment, technical consensus and lack of common standard. In addition, the business sense and possibility of the block chain technology is expected to be the innovation of the industrial ecosystem by entering into the reality system from the concept through monitoring the actual introduction performance in the field of copyright, logistics, health care and environment.

Smart Contract's Hierarchical Rules Modularization and Security Mechanism (스마트 컨트랙트의 계층형 규칙 모듈화와 보안 메커니즘)

  • An, Jung Hyun;Na, Sung Hyun;Park, Young B.
    • Journal of the Semiconductor & Display Technology
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    • v.18 no.1
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    • pp.74-78
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    • 2019
  • As software becomes larger and network technology develops, the management of distributed data becomes more popular. Therefore, it is becoming increasingly important to use blockchain technology that can guarantee the integrity of data in various fields by utilizing existing infrastructure. Blockchain is a distributed computing technology that ensures that servers participating in a network maintain and manage data according to specific agreement algorithms and rules to ensure integrity. As smart contracts are applied, not only passwords but also various services to be applied to the code. In order to reinforce existing research on smart contract applied to the blockchain, we proposed a dynamic conditional rule of smart contract that can formalize rules of smart contract by introducing ontology and SWRL and manage rules dynamically in various situations. In the previous research, there is a module that receives the upper rule in the blockchain network, and the rule layer is formed according to this module. However, for every transaction request, it is a lot of resources to check the top rule in a blockchain network, or to provide it to every blockchain network by a reputable organization every time the rule is updated. To solve this problem, we propose to separate the module responsible for the upper rule into an independent server. Since the module responsible for the above rules is separated into servers, the rules underlying the service may be transformed or attacked in the middleware. Therefore, the security mechanism using TLS and PKI is added as an agent in consideration of the security factor. In this way, the benefits of computing resource management and security can be achieved at the same time.

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A robust execution scheme for Ethereum blockchain application services

  • Kwon, Min-Ho;Lee, Myung-Joon
    • Journal of the Korea Society of Computer and Information
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    • v.25 no.3
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    • pp.73-80
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    • 2020
  • In this paper, we propose a robust execution scheme for Ethereum blockchain application services which provide continuous services and support recovery even in the case of failures of those services. As of now, blockchain services are rapidly expanding to all industries and being combined with various infrastructure services of public institutions. But if these services fail in disastrous situations such as earthquakes, floods and terrors or various hacking attacks, the aftermath is very serious and its side effects are difficult to assess. To resolve this issue, we develop the service registry as a smart contract of the Ethereum blockchain, which provides useful information on the services to users even in disasters. With the help of the service registry, we also present a method of replicating services on the basis of the ETCD distributed storage system. The proposed scheme is confirmed by the test service developed by the proposed techniques.

Implement and Experiment of Efficient Off-Chain (단방향 해시 함수를 활용한 효율적인 Off-chain Payment Channel 구현 및 실험)

  • Kim, Sun Hyoung;Jeong, Jae Yeol;Jeong, Ik Rae
    • Journal of the Korea Institute of Information Security & Cryptology
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    • v.29 no.6
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    • pp.1413-1424
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    • 2019
  • Cryptocurrency has limitations to be used as an actual payment method due to the scalability problem of the blockchain consensus protocol, and various off-chain solutions to solve these limitations are being studied. In this paper, we design an efficient off-chain payment channel using one-way hash function and implement the designed payment channel using Ethereum smart contract. In addition, the experiment was conducted to measure and analyze execution time and cost for each method by deploying it in the same environment as the previously implemented plasma MVP. As a result, compared with plasma MVP, the proposed solution was able to reduce the total cumulative time by about 34% and reduce the overall execution cost by about 41%.

A Blockchain-based User Authentication Model Using MetaMask (메타마스크와 연동한 블록체인 기반 사용자 인증모델)

  • Choi, Nakhoon;Kim, Heeyoul
    • Journal of Internet Computing and Services
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    • v.20 no.6
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    • pp.119-127
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    • 2019
  • This paper proposes a new authentication model to solve the problem of personal information takeover and personal information theft by service providers using centralized servers for user authentication and management of personal information. The centralization issue is resolved by providing user authentication and information storage space through a decentralize platform, blockchain, and ensuring confidentiality of information through user-specific symmetric key encryption. The proposed model was implemented using the public-blockchain Ethereum and the web-based wallet extension MetaMask, and users access the Ethereum main network through the MetaMask on their browser and store their encrypted personal information in the Smart Contract. In the future, users will provide their personal information to the service provider through their Ethereum Account for the use of the new service, which will provide user authentication and personal information without subscription or a new authentication process. Service providers can reduce the costs of storing personal information and separate authentication methods, and prevent problems caused by personal information leakage.

Blockchain System for Academic Credit Bank System (학점은행제를 위한 블록체인 시스템)

  • Son, Ki-Bong;Son, Min-Young;Kim, Young-Hak
    • The Journal of the Korea Contents Association
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    • v.20 no.5
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    • pp.11-22
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    • 2020
  • The academic credit banking system is an educational system to implement a lifelong learning society. Students who meet the requirements of this system can achieve academic degrees equivalent to those of junior colleges or four-year universities. Credits and degree information of these students are recorded and managed by the central institution. However, this system can cause security problem such as hacking due to centralized management. In this paper, we propose an academic credit banking system which can manage credits and degree information based on blockchain technology. In the proposed system, credits and degree information are stored in block and managed in the public ledger in a permanent manner. Blocks are connected in the form of blockchain on a distributed network to improve security problems such as hacking and manipulation. Also, the efficiency of credit bank management can be increased because the functions of the central institution are distributed to the network participants. The prototype of the proposed system was implemented on the Go-Ethereum platform and experimentally verified the blockchain information among participating organizations using smart contracts.