• Title, Summary, Keyword: 스마트 컨트랙트

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Access controlled Blockchain services based on Attribute-Based Encryption (속성기반 암호기법을 활용한 블록체인 서비스 유형 연구)

  • Ryu, Hyewon;Kim, Hyung-Jong
    • Proceedings of the Korea Information Processing Society Conference
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    • pp.201-203
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    • 2019
  • 블록체인은 P2P 네트워크로 탈중앙화된 신뢰성 기반 데이터 공유 서비스를 제공한다. 다양한 블록체인 플랫폼 중에서도 이더리움은 가장 상용화된 플랫폼으로 비트코인의 한계를 극복하면서도 스마트 컨트랙트를 통한 신뢰성 있는 서비스를 제공한다. 본 논문에서는 블록체인 기반 분산 컴퓨팅 플랫폼인 이더리움에 속성기반 암호기법을 적용하여 네트워크 내의 블록체인에 대한 제한적 접근 서비스를 제안하고 이를 통해 블록체인 서비스 유형을 제시한다.

Blockchain based Gas Station System (블록체인 기반의 주유소 시스템)

  • Choi, Seung-Ju;Jeong, Seo-Hwa
    • Proceedings of the Korea Information Processing Society Conference
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    • pp.705-708
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    • 2019
  • 본 논문에서는 블록체인 기반의 주유소 시스템을 제안하였다. 매년 주유소에서 발생하는 대표적인 불법 행위인 경유와 등유를 섞어 제조한 가짜 석유 판매 및 정량 미달 기름 판매를 막기 위해 주유소 기름의 이상 여부를 확인하는 시스템을 이더리움 블록체인의 스마트 컨트랙트를 통해 구현하였다. 시스템의 적용을 보이기 위해 가상의 주유소를 웹페이지로 구현하였으며, 시스템과 기기들 간의 상호작용을 확인하였다.

A Mobile Voting DApp Implementation and Security Issues (모바일 투표 Dapp 실행 및 보안 이슈)

  • KHERLEN, NARANTUYA;Park, Jun Beom;Park, Jong Sou
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.290-292
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    • 2019
  • Since the advent of blockchain and bitcoin, decentralization has been accelerating around the world as a public blockchain ethereum with smartcontract has begun. Developers can use Ethereum's blockchain development platform to develop "distributed applications" (DApp) running on a decentralized P2P network, and various types of devices from IoT to mobile can participate in a block-chain distributed environment have. Using Ethereum's blockchain development platform, developers can develop "Decentralized Application (DApp)" that run on a decentralized P2P network and various types of devices from IOT to mobile can participate in distributed blockchain environments. There are many ways to interact with the blockchain and the smart contract, but users tend to prefer the mobile methods due to their convenience and accessibility advantages. Therefore, the author developed an Android based voting DApp and researched related issues. Since the current development methods of DApp are not adequately researched and standardized, efficient methods for developing user-friendly DApp were studied. Because DApp has to spend a certain amount of fees to interact with blockchain, it has intensively investigated the gas problem of Smart Contract code and the security problem of code, and author would like to introduce it in this paper.

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Construction for Safe Transaction System using Blockchain Technology(Case:Used Car) (블록체인 기술을 이용한 안전 거래 시스템 구축(사례:중고자동차))

  • Ahn, Byeongtae
    • Journal of Digital Convergence
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    • v.18 no.4
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    • pp.237-242
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    • 2020
  • Online e-commerce management systems are gradually increasing, and transactions are made in various items. However, the reliability between sellers and buyers is very important in high-priced transactions such as automobiles when used transactions online. Nevertheless, in the existing used trading system, a device that prevents fraud or trusts the seller is insufficient. This paper developed a blockchain-based used transaction management system to improve the reliability that occurs during used transactions. We have improved the safety trading system by developing a trading management system for used cars with the highest amount of used cars in various fields. This system uses Ethereum-based smart contract to guarantee reliability without third party intervention. By designing the contracts required for used car trading by utilizing smart contracts, it was possible to reduce the effort and time of trading participants in the existing used car transactions, while enabling safe transactions. In addition, this system mitigated information asymmetry between buyers and sellers, and reduced and prevented brokerage fees in the distribution process without third parties.

A Study on Improvement of Housing Bond Information Relay System Using Blockchain (블록체인을 활용한 국민주택채권 정보 중계시스템 개선방안 연구)

  • Nam, Jin-Seok;Yang, Hae-Sool
    • Journal of Digital Convergence
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    • v.15 no.8
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    • pp.203-212
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    • 2017
  • The National Housing Bond Information Relay System is a representative financial information relay system in which institutions are connected with center system. A centralized structure is expensive to construct and operate center, and there is a problem that all networks are disconnected when a failure occurs in the center system. In this paper, we propose the national housing bond information relay system model based on Blockchain technology that can process information safely and efficiently. The proposed model constructs a Blockchain network so that each institution that processes the national housing bond information can transmit information safely, and each institution manages the same distributed ledge by a smart contract. The proposed model can reduce the cost because it can process complicated national housing bond transaction information without a relay center, and a network usage and disk usage decreased by 1.7% and 8.53%.

Ethereum-based game platform design for revitalizing donation (기부활성화를 위한 이더리움 기반 게임 플랫폼 설계)

  • Min, Youn-A;Kim, Seo-Yoon;Lee, Seung-Soo;Lee, Won-Chang;Baek, Yeong-Tae
    • Proceedings of the Korean Society of Computer Information Conference
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    • pp.357-358
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    • 2019
  • In this paper, we propose a donation game platform using blockchain to revitalize the shrinking donation market. The platform is designed to ensure transparency and user reliability in the use of ethereum's smart-track function and to attract interest from donors and encourage continued donations by introducing games into the donation process through donor organizations to address the opaque nature of the donation and use of the funds and the result of the donation portfolio. It also develops a donation ecosystem that benefits donors, donors and sponsor companies alike by platforming them.

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Blockchain-based talent trading platform (블록체인 기반 재능 거래 플랫폼)

  • Yang, Seonghun;you, dojin;You, Wonjun;Choi, Sol;Jin, Hoe-Yong;Kim, Sang-Kyun
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • pp.530-534
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    • 2020
  • 본 논문에서는 블록체인 기반 재능 거래 플랫폼의 프로토타입을 설계하고 구현한다. 기존에 재능 거래 플랫폼은 서버-클라이언트 모델 기반의 서비스를 제공하여. 서버를 운영하는 비용과 거래에 대한 중재자 인건비가 발생한다. 따라서 이용자들이 높은 거래 수수료를 부담하는 단점을 가진다. 이러한 단점을 보완하기 위해 이더리움 플랫폼 기반 dapp 으로 구현하여 거래 정보를 블록에 올려 서버 및 데이터베이스 운영 비용을 절감하고, 스마트 컨트랙트를 통해 거래 중재자 인건비를 절감하여 거래 수수료를 낮추기 위한 재능 거래 플랫폼을 구현하였다.

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

  • Lee, Yong-Joo;Woo, Sung-Hee;Lee, Sang-Ho
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.635-638
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    • 2018
  • The Cost for introducing smart factory will decrease and the service type will change from a large scale to small quantity manufacturing, when 3D printing technologies have actively applied and smart factory related technologies have more stably developed. If customers have to provide private information, the availability of developed technology may cause slow progress. We propose a new protocol for custom manufacturing service of smart factory. The proposed approach is designed for smart contract based IoT convergence network. We analyzed the requirements of the proposed approach which provides anonymity, privacy, fairness, and non-repudiation. We compared it with closely related studies to show originality and differences.

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A Study on the Authentication Method of IoT Devices Based on Blockchain (블록체인을 활용한 IoT 기기인증 방안에 관한 연구)

  • Lee, Jiyun;Hong, Seng-phil
    • Journal of Security Engineering
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    • v.15 no.5
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    • pp.299-308
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    • 2018
  • IoT is utilized in various fields due to the expansion of the market size and device distribution and it is receiving the attention as a core added value industry-leading new industries in ICT market. However, because the Internet of Things is a system that is based on data exchange, it is critical to security threats such as the insertion of malicious codes, modulation of data due to hacking and botnet. Since most of the devices in the market are the low specification, there are limitations in applying device authentication technologies that require high throughput. In this paper, we are going to contribute to the establishment of a stable IoT environment by proposing a secure device authentication methods based on Blockchain to complement the device authentication issues that occur within the IoT environment.

A Study about Blockchain Donation System using Ethereum (이더리움을 사용한 블록체인 기부 시스템에 관한 연구)

  • Kim, Chae-Yeon;Kim, Yeong-Hee;Lee, Ji-Ho
    • Proceedings of the Korea Information Processing Society Conference
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    • pp.453-455
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    • 2019
  • 과거 대비 국내 기부 문화의 성장 속도는 해가 거듭될수록 침체 되고 있다. 기부가 저조한 가장 큰 이유는 기부 단체에 대한 불신이다. 본 논문은 블록체인 기술을 이용한 이더리움 스마트 컨트랙트를 구현하여 거래의 투명성을 확보하고 기부에 대한 신뢰성을 향상시킬 수 있는 기부 시스템을 연구 및 설계하였다. 향후 이 시스템은 암호화폐의 사용이 활발해질 수록 보다 다양한 서비스를 제공할 수 있을 것이다.