• Title, Summary, Keyword: 스마트 컨트랙트

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Privacy-preserving Customized Order Service Protocol based on Smart Contract in Smart Factory (프라이버시를 제공하는 스마트 컨트랙트 기반의 스마트 팩토리 주문제작 프로토콜)

  • Lee, YongJoo;Woo, Sung-Hee;Lee, Sang-Ho
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.23 no.2
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    • pp.215-222
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    • 2019
  • Advances in technologies about 3D (three-dimensional) printing and smart factory related issues will have the effect of reducing the cost of building a smart factory and making various types of service available. Manufacturers and service providers of small assets work with outside experts to provide small amounts of customized ordering services. If customers have to disclose their private information to subscribe to a new service, they may be reluctant to use it and the availability of developed technology may cause slow progress. We propose a new protocol for customized order service for smart factory. The proposed approach is designed to meet requirements of security and based on smart contract in IoT convergence network. We analyzed the requirements of the proposed approach which provided anonymity, privacy, fairness, and non-repudiation. We compared it with closely related studies to show originality and differences.

Blockchain Watchdog: Real-time Blockchain Surveillance System Connecting Smart Contract Code and Distributed Storage (Blockchain Watchdog: 분산 저장소와 스마트 컨트랙트 코드 연동 실시간 블록체인 관제시스템)

  • Hong, Joongi;Kim, Suntae;Ryu, Duksan
    • The Journal of The Institute of Internet, Broadcasting and Communication
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    • v.20 no.4
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    • pp.115-121
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    • 2020
  • As the participation of blockchain increases, governance to maintain the ecosystem is being activated. Governance must be managed/supervised to maintain and improve the blockchain. However, as the usage of blockchain increases, there is a limit for people to manage it individually. In addition, smart contracts applied from Ethereum need to be verified for trade that are determined according to status values, as new trade types are possible. This research proposes a surveillance system, Blockchain Watchdog, based on the state monitoring of the blockchain smart contract as a tool for maintaining and developing the blockchain ecosystem of governance, and implemented and tested the surveillance system. As a case study, we conducted experiments on Ropsten and Ganache, and were able to see real-time information collection and visualization using dashboards, graphs, and charts. We expect to contribute to the maintenance and development of the ecosystem of blockchain governance through Blockchain Watchdog.

Private Blockchain and Smart Contract Based High Trustiness Crowdsensing Incentive Mechanism (프라이빗 블록체인 및 스마트 컨트랙트 기반 고신뢰도 크라우드센싱 보상 메커니즘)

  • Yun, Jun-hyeok;Kim, Mi-hui
    • Journal of the Korea Institute of Information Security & Cryptology
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    • v.28 no.4
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    • pp.999-1007
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    • 2018
  • To implement crowdsensing system in reality, trustiness between service provider server and user is necessary. Service provider server could manipulate the evaluation of sensing data to reduce incentive. Moreover, user could send a fake sensing data to get unjust incentive. In this paper, we adopt private blockchain on crowdsensing system, and thus paid incentives and sent data are unmodifiablely recorded. It makes server and users act as watcher of each others. Through adopting smart contract, our system automates sensing data evaluation and opens to users how it works. Finally, we show the feasibility of proposing system with performance evaluation and comparison with other systems.

Study on Digital content copyright protection and transaction activation method Using block chain Ethereum (블록체인을 활용한 디지털 콘텐츠 저작권 보호 및 거래활성화 방법 연구)

  • Baek, Yeong tae;Min, Youna
    • Proceedings of the Korean Society of Computer Information Conference
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    • pp.73-75
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    • 2018
  • 디지털 콘텐츠의 영역을 확장하여 발달된 기술을 반영한 다양한 디지털 콘텐츠 기술이 발달하고 있다. 가상현실, 증강현실, 컴퓨터그래픽, 홀로그램, 오감 인터랙션, 지능형 스마트 미디어 유통기술이 그것인데 이 중 지능형 스마트 미디어 유통기술이란 IoT, 클라우드, 빅데이터 기반 개인 맞춤형 콘텐츠 유통기술, 영상정보를 검색하여 방송, 모바일 등 연관콘텐츠를 제공하는 유통기술(Visual Browsing) 등을 말한다. 이 논문에서는 디지털 콘텐츠 중 지능형 스마트 미디어 유통기술을 안전하게 개발하고 발전시키기 위하여 블록체인 방법을 활용한 스마트 미디어 유통기술에 대하여 연구하였다. 블록체인 기반 기술을 통하여 스마트 미디어 유통 시 해킹으로부터 데이터 원본 보호의 안전함을 제공하고 유통 시 필요한 저작권관리 및 유통 기록을 위 변조 없이 관리할 수 있다.

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Access Control Mechanism for Industrial Control System Based Smart Contract (스마트 컨트랙트 기반의 산업제어시스템 접근 제어 메커니즘)

  • Cho, Minjeong;Lee, Changhoon
    • Journal of the Korea Institute of Information Security & Cryptology
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    • v.29 no.3
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    • pp.579-588
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    • 2019
  • Industrial control systems consist of various physical devices such as sensors, actuators. Security Infringement such as waterworks facilities Remote Access Infringement and power control systems Infection have been occured by vulnerability of Access Control. Access control to physical devices must be fulfilled with a reliable system. However, Having a single access control system inside company can not guarantee reliability. In addition, when single access control is struggled with error or infringement, access control system is totally unavailable. so system requires a additional access control method or system. In this paper, we proposed access control mechanism for reliable and stable operation using blockchain and smart contract. Proposed Mechanism using trust score to consider resources to be consumed depending on each industrial environment in consideration of the industrial control system where availability is more important than integrity and confidentiality. Unlike other blockchain-based access control system, proposed system is designed for the currently operating industrial control system.

Technology and Policy for Blockchain-based Spectrum Sharing (블록체인 기반의 전파 공유 기술과 전파 정책)

  • Shin, Na Yeon;Nam, Ji-Hyun;Choi, Ye Jin;Lee, Il-Gu
    • Journal of Digital Convergence
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    • v.17 no.10
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    • pp.13-21
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    • 2019
  • The restricted network or the unbalanced distribution of spectrum is causing the problems of lack of spectrum resources and deterioration of the service quality. In addition, the existing centralized radio sharing method has not been a fundamental solution for radio sharing and is inefficient in terms of cost, convenience, and security. In this paper, we propose a blockchain-based spectrum sharing as a low-cost, trustworthy, high-efficiency platform that can distribute and share spectrum resources, and propose policies to realize this. In the spectrum sharing platform, spectrum information about Wi-Fi AP and LTE mobile hotspot is registered in the blockchain, and spectrum sharers and users can conclude peer-to-peer spectrum sharing contract quickly and efficiently through smart contract. The pay for the shared spectrum resources and reward for spectrum quality management open platform ecosystem to activate the circulation-sharing and it can provide a convenient and efficient public wireless infrastructure.

Delivery Tracing Protect Model Based Smart Contract for Guaranteed Anonymity (익명성 보호를 위한 스마트 컨트랙트의 배송추적 방지 모델)

  • Kim, Young Chan;Kim, Young Soo;Im, Kwang Hyuk
    • Journal of Industrial Convergence
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    • v.16 no.1
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    • pp.15-20
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    • 2018
  • Along with the increase of internet shopping, crimes that exploited personal information on the invoice of goods are becoming more and more advanced and becoming more and more classified from the interception of goods through voice phishing attack, injury, sexual offense. Therefore, in order to guarantee the anonymity of the customer's delivery information, there is a need for a delivery tracking prevention system which keeps the route information of the product's destination secret among delivery companies. For this purpose, We suggest that delivery tracing protect model based smart contract for guaranteed anonymity to protect the anonymity by encrypting delivery information and by separation of payment and personal information using the anonymity technique of block chain-based cryptography. Our proposed model contributes to expansion of internet shopping based on block chaining by providing information about product sales to company and guaranteeing anonymity of customer's delivery information to customer.

WiCoin : Wireless LAN Sharing Using Block Chain Technology (와이코인 : 블록체인 기술을 이용한 무선랜 공유)

  • Kim, Woo-Seong;Ryu, Kyoung-Ho;Park, Yang-Jae
    • Journal of Digital Convergence
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    • v.17 no.1
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    • pp.195-201
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    • 2019
  • This paper proposes a blockchain system to share Wireless Local Area Network (WLAN) that recently suffers from mutual interference among increasing devices using unlicensed bands. Blockchain technology can induce cooperation from users by incentivizing them with cryptocurrency like shown in Bitcoin example. In this paper, we describe Blockchain based access mechanism in WLAN instead of conventional authentication based access. Here, users can access any WLAN access point by paying through smart contract while they also receive payment from others. In order to support real-time transaction, we apply proof-of-authority that is realized by Byzantine fault tolerant protocol instead of well-known proof-of-work that requires huge computing power and delay.

A Study on the Production and Consumption Authentication Power Trading System based on Big Data Analysis using Blockchain Network (블록체인 네트워크를 이용한 빅데이터 분석 기반 생산·소비량 인증 전력 거래 시스템에 관한 연구)

  • Kim, Young-Gon;Heo, Keol;Choi, Jung-In
    • Journal of Energy Engineering
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    • v.28 no.4
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    • pp.76-81
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    • 2019
  • This paper is a review of the certification system required for various energy prosumer business models, including P2P energy trading and participation in small demand response programs, which are based on reliable production and consumption certification. One of the most important parameter in energy trading is ensuring the reliability of trading account balancing. Therefore, we studied to use big data pattern analysis based blockchain smart contract between trading partners to make its tradings are more reliable. For this purpose big data analysis system collected from the IoT AMI and a production authentication system using a private blockchain network linked with the AMI is discussed, using the blockchain smart contract are also suggested. Futhermore, energy trading system concept and business models are introduced.