• Journal of the Korea Institute of Information and Communication Engineering
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• v.23 no.8
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• pp.1018-1023
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• 2019

Since 2010, vehicle black boxes have become popular with many people, if there is no record of the vehicle accident scene, or if the offender deliberately deletes the image data, the victim succeeds. The biggest advantage of blockchain is that it is impossible to modify and delete data by data distribution storage. The biggest disadvantage is that sensitive data is also distributed. In this paper, we propose a blockchain method for the black box by using the advantage of shared block data and we intend to solve the problem of personal information leakage which is a disadvantage of blockchain by storing sensitive information stored in a blockchain in a private server by LINK blockchain with a private server. We also attached code(Github) and demonstration video(Youtube) linking LINK blockchain with the private server in this paper.

• Journal of Industrial Convergence
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• v.20 no.11
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• pp.57-63
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• 2022

If ECU data, which is responsible for collecting and processing data such as sensors and signals of automobiles, is manipulated by an attack, it can cause damage to the driver. In this paper, we propose a system that verifies the integrity of automotive ECU data using blockchain. Since the car and the server encrypt data using the session key to transmit and receive data, reliability is ensured in the communication process. The server verifies the integrity of the transmitted data using a hash function, and if there is no problem in the data, it is stored in the blockchain and off-chain distributed storage. The ECU data hash value is stored in the blockchain and cannot be tampered with, and the original ECU data is stored in a distributed storage. Using the verification system, users can verify attacks and tampering with ECU data, and malicious users can access ECU data and perform integrity verification when data is tampered with. It can be used according to the user's needs in situations such as insurance, car repair, trading and sales. For future research, it is necessary to establish an efficient system for real-time data integrity verification.

• Proceedings of the Korea Information Processing Society Conference
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• 2018.10a
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• pp.260-263
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• 2018

현재까지 공항에서의 체크인 시스템은 기본적으로 서버-클라이언트(Server-Client)방식으로 구동되어져왔다. 서버-클라이언트 방식에서 서버는 단일실패지점이기 때문에 천재지변이나 공격자에 의해 서버마비와 같은 문제가 생기면 체크인 시스템 전체가 마비될 수 있다. 뿐만 아니라 실제 해커에 의해 항공사 중앙 서버가 공격을 받게 되면, 서버가 관리하는 항공사 데이터들의 무결성이 훼손될 수도 있다. 따라서 단일 실패지점에 대한 위협을 제거함과 동시에 저장된 데이터들의 무결성을 유지하는 방법을 논의할 필요가 있다. 그 중 하나로 블록체인 기술을 이용한 탈중앙화 시스템(Decentralized System) 모델을 적용하는 방법이 있다. 본 논문에서는 스마트 계약을 이용한 블록체인 기반 공항 체크인 시스템에 대한 모델을 제안한다.

• KNOM Review
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• v.24 no.2
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• pp.1-12
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• 2021

Recently, research on CBDC (Central Bank Digital Currency) has been actively conducted for various reasons by countries around the world. In addition, with the dazzling development of blockchain technology, blockchain technology is being adopted in CBDC. In this paper, we propose a blockchain-based CBDC system that can be effectively used in the traditional banking system. We also analyze the requirements of CBDC and suggest ways to commercialize CBDC. We present a system design and implementation method, especially in terms of compatibility, interoperability, and privacy.

• Proceedings of the Korea Information Processing Society Conference
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• 2021.05a
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• pp.202-204
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• 2021

다양한 IoT 기기로 구성된 모바일 IoT 환경에서는 IoT에서 수집된 데이터가 다른 IoT의 학습 데이터로 사용되는 순환 구조로 이루어져 있다. 따라서 해당 환경에서 데이터는 공유되는 자원이며 매우 중요한 요소이다. 특히 IoT 기기가 밀집된 지역에서는 많은 트래픽이 발생하기 때문에 전송지연 및 데이터 손실로 인한 시스템 성능이 저하되는 문제가 발생한다. 따라서 본 논문에서는 안전한 데이터 통신을 위한 블록체인 기반의 시스템 구조를 제안한다. 해당 시스템은 블록체인을 사용하여 IoT 기기의 이동성과 밀집도를 판별하고, 트래픽 밀집 구역이 발생하였을 경우 UAV를 활용하여 통신이 원활하게 이루어질 수 있도록 한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2021.05a
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• pp.117-120
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• 2021

지능형 교통 시스템의 주요 인프라 중 하나인 VANET 은 차량과 인프라 간의 통신을 통해 교통을 예측함으로써 도로 상에서의 안전을 보장한다. VANET 은 모든 노드가 네트워크에 가입할 수 있는 개방형 네트워크이기 때문에 개인 정보 보호가 주된 관심사이다. 분산형 신뢰 관리 시스템은 차량 네트워크에서 수신된 메시지가 신뢰할 수 있는 지에 대한 여부를 결정함으로써, 악의적인 공격자로부터 차량을 지킬 수 있다. 분산형 k-익명성 체계와 블록체인을 결합한 신뢰 관리 시스템은 주변 차량들과 협력하여 익명의 은폐 영역을 구축한다. 본 논문에서는 블록체인을 적용한 분산형 신뢰 관리 시스템을 통해 차량의 위치 정보를 보호하는 최근 연구들을 살펴본 뒤에 향후 발전 방향에 대해 논하도록 하겠다.

• Smart Media Journal
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• v.13 no.4
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• pp.65-75
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• 2024

This paper proposes a new approach to video surveillance systems, which have become essential components in modern urban management. By utilizing blockchain and IPFS, it enhances data integrity and privacy protection. Additionally, anomaly detection and automatic video storage are enabled through object detection technology, thus improving urban safety and security. This integrated approach serves as an efficient management methodology for surveillance systems, providing city administrators and citizens with a safer and more effective monitoring environment.

• Journal of Internet of Things and Convergence
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• v.4 no.2
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• pp.13-20
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• 2018

In this paper, we propose an authentication system that combines 'Single-Sign-On' and 'Token-based authentication' based on 'Block Chain' technology. We provide 'access control' function and 'integrity' by combining block-chain technology with single-sign-on authentication method and provided stateless self-contained authentication function using Token based authentication method. It was able to enhance the security by performing the encryption based Token issuance and authentication process and provided convenience of authentication to Web Server. As a result, we can provide token-based SSO authentication service efficiently by providing a convenient way to improve the cumbersome authentication process.

• Smart Media Journal
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• v.8 no.2
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• pp.94-98
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• 2019

In this paper, we developed the tools enabling to manage the IoT systems owned by managers. Since equipment agents consists based on open-source block-chain framework, we can secure the invariance on data and furthermore can locate the resources by searching the AP connected to the equipments. Also the manager can trace the connecting details on equipments from their block-chain accounts. In addition, we work on the possibility of protecting ARP poisoning attacks by removing the credibility on additional ARP requests being generated during the process of network creation.

• The Transactions of the Korea Information Processing Society
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• v.13 no.3
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• pp.102-110
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• 2024

Blockchain records all transactions issued by users, which are then replicated, stored, and shared by participants of the blockchain network. Therefore, the capacity of the ledger stored by participants continues to increase as the blockchain network operates. In order to address this issue, research is being conducted on methods that enhance storage efficiency while ensuring that valid values are stored in the ledger even in the presence of device failures or malicious participants. One direction of research is applying techniques such as Reed-Solomon encoding to the storage of blockchain ledgers. In this paper, we apply Reed-Solomon encoding to the key-value store used for ledger storage in an open-source blockchain, and measure the storage efficiency and increasing computational overhead. Experimental results confirm that storage efficiency increased by 86% while the increase in CPU operations required for encoding was only about 2.7%.