• The Journal of Society for e-Business Studies
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• v.10 no.1
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• pp.121-134
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• 2005

The MANET has many problems in security despite of its many advantages such as supporting the mobility of nodes, independence of the fixed infrastructure, and quick network establishment. In particular, in establishing security, the traditional certification service has many difficult problems in applying to the MANET because of its safety, expandability, and availability. In this paper, a secure and effective distributed certification service method was proposed using the Secret Sharing scheme and the Threshold Digital Signature scheme in providing certification services in the MANET. In the proposed distributed certification service, certain nodes of relatively high safety among the mobile nodes consisting of the MANET, were set as privileged nodes, from which the process of issuing a certification started. The proposed scheme solved problem that the whole network security would be damaged by the intrusion to one node in the Centralized Architecture and the Hierarchical Architecture. And it decreased the risk of the exposure of the personal keys also in the Fully Distributed Architecture as the number of the nodes containing the partial confidential information of personal keys decreased. By the network simulation, the features and availability of the proposed scheme was evaluated and the relation between the system parameters was analyzed.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.33 no.1
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• pp.104-109
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• 2005

The aircraft gas turbine engines with the Electronic Engine Controls(EEC) had been developed to save fuel and enhance their performance in the early days, and had employed the health monitoring function in the Full Authority Digital Engine Controls(FADEC) to improve their reliability. This has led to an increasing demand for the certification technology of these controls. The design and certification issues of power supply, aircraft supplied data, failure modes, software verification/validation, and lightning requirements need to be addressed. This paper presents the design considerations and the certification techniques applied to the electronic engine controls. And it is believed that this paper will be basis to establish a requirement in Korean Airworthiness Standard.

• Journal of Aerospace System Engineering
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• v.17 no.1
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• pp.1-9
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• 2023

Recently, aerospace industries in South Korea are expected to continue to grow due to UAM. Accordingly, certification services for aircraft are expected to increase. As a way to cope with the increase of certification work, one could consider a delegation system that can limitedly delegate the unique role of airworthiness authorities. In this paper, we reviewed regulations of FAA's individual delegation (DER, DAR, DMIR, etc.), the organizational delegation system (ODA), and the EASA's organizational delegation system (DOA, POA). We also reviewed regulations and actual status of delegation system in South Korea. On the basis of these, considering circumstances of aerospace industries in South Korea, we presented a method to introduce certification delegation system gradually and to improve domestic certification regulation.

• Journal of Korea Ship Safrty Technology Authority
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• s.31
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• pp.71-80
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• 2011

STCW-F협약은 어선에서 인적요소에 의한 해양사고예방을 위하여 IMO가 1995년에 채택한 협약으로 발효 요건은 15개국만 비준하면 발효되도록 한 협약이나 아직 발효되고 있지 않으나 최근에 비준국가의 급격한 증가로 발효가 임박하였다. 협약은 그 명칭에서 보는 바와 같이 어선 해기사의 자격증명과 훈련 및 당직근무의 기준에 관한 것이다. 자격증명은 무제한 수역에서 조업하는 길이 24미터 이상 항해어선의 당직항해사와 선장, 길이 45미터 이상 제한수역에서 조업하는 당직항해사 및 선장에 대한 자격증과 주기관 추진력 750킬로와트 이상 어선에 승무하는 일등기관사 및 기관장에 대한 자격증명 및 무선통신사의 자격증명이 있다. 훈련은 모든 어선원을 위한 기초안전훈련이 있으며 당직근무기준은 어선에서 항해당직을 유지하기 위하여 준수해야할 원칙이 있다. 또한 회의에서 채택한 결의서가 9개 있다. 특히 동 협약이 발효되면 비차별 조항에 따라 당사국은 항만국 통제를 시행할 수 있으므로 주요 연안국에서 입어 협상 등에서 자기 나라의 입지를 강화하기 위한 수단으로 사용될 소지도 있어 이에 대한 연구가 필요하다.

• Journal of Korean Institute of Industrial Engineers
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• v.26 no.4
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• pp.411-420
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• 2000

Among the standards of CALS, CITIS(Contractor Integrated Technical Information Service) is a standard in information share procedure which manages all data and services occurred between a contractor and a purchaser. CITIS services have some security problems like authentication problem and repudiation problem, when they are implemented using the Internet. To solve these problems, CITIS needs a user certificate system which can allow to access important information only to qualified users. This paper proposed a PKI(Public Key Infrastructure) Certificate Authority for CITIS, and created a real User Certificate System which can be adjusted to circumstances of real CITIS.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.42 no.11
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• pp.27-34
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• 2005

Mobile Ad Hoc Networks (MANETs) are self-organized networks that do not rely in their operation on wired infrastructure. As in any networking technology, security is an essential element in MANET as well, for proliferation of this type of networks. But supporting secure communication in MANETs proved to be a significant challenge, mainly due to the fact that the set of nodes in the network can change frequently and rapidly and due to the lack of access to the wired infrastructure. In particular, the trust model and the authentication protocols, which were developed for wired and infrastructure-based networks, cannot be used in MANETs. In this paper, we address the problem of efficient authentication of distributed mobile users in geographically large networks. In particular, we propose a new authentication scheme for this case of MANETs. The proposed scheme exploits Randomized Groups to efficiently share authentication information among nodes that together implement the function of a distributive Certification Authority (CA). We then evaluate the performance of authentication using Randomized Groups.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.7 no.5
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• pp.858-865
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• 2006

A certificate that is issued by the certification authority can be revoked within the period of validity by various reasons such as the loss of private key, disqualification or the change in key. Therefore, the certificate status verification must precede prior to use Currently, the CRL or the OCSP methods are used in most cases. But the CRL system can't guarantee the present status of the certificate, and the OCSP generates heavy network traffic by checking or requesting certificate status in real-time using high-capacity messages. In this paper, we propose a system that requests the certificate verification by creating VDN for user identity information. Through this system, the certification authority will be able to guarantee the certificate's status in real-time, and solve the problem of the sewer and network overload by verifying and finding user identity information from VDN, Based on the results, we propose a real-time certificate status verification system which can improve the speed of the verification. We confirmed the improvement in speed by testing and comparing it with the existing methods.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2016.10a
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• pp.463-466
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• 2016

Sharing of product and process information with partners is a basic activity and key requirement which ensures success of distribution. ePedigree that encapsulates all of the event data from manufacturer to retail shop provides a flexible mechanism of storing and sharing traceable information to the partners of supply chain and credibility of shared information through digital signature based on Public Key Infrastructure (PKI). To generate the signature that can be authenticated through PKI, the partners of supply chain should pay for PKI certificates from Certificate Authority (CA). In case of agrifood cooperatives which consist of petty merchants or farmers, it is hard to pay for the PKI certificate for all members and is a big obstacle for the ePedigree to be applied to the supply chain. This paper proposes a private certification method of ePedigree for cooperatives. Cooperatives can apply the ePedigree using the proposed method to all the members at small cost and the proposed method can assure the credibility of information at the same level of the previous ePedigree.

• Korean Journal of Food Science and Technology
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• v.48 no.3
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• pp.193-200
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• 2016

The purpose of this study was to investigate whether the electronic nose can be applied as a primary screening procedure to detect ethanol in gochujang for halal certification. First, ethanol content in 25 traditional gochujang was measured by gas chromatography with flame ion detector, widely accepted as the conventional method of alcohol detection. The content ranged from 0.14 to 2.7%. Then, 8 gochujangs selected from among the initial 25 samples were analyzed by electronic nose. Similar ethanol content patterns were observed between the two detection methods. In addition, commercial gochujang products were examined by electronic nose to ensure that they complied with the required ethanol standard of the halal certification authority. Consequently, it was confirmed that electronic nose analysis can be applied as a primary screening method for halal certification.

• Journal of Convergence Society for SMB
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• v.2 no.2
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• pp.35-41
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• 2012

The rapid development of cloud computing and mobile internet service changes to an mobile cloud service environment that can serve and pay computing source that users want anywhere and anytime. But when user misses mobile device, the respond to any threat like user's personal information exposal is insufficient. This paper proposes cloud service access control model to provide secure service for mobile cloud users to other level users. The proposed role-based model performs access authority when performs user certification to adapt various access security policy. Also, the proposed model uses user's attribute information and processes before user certification therefore it lowers communication overhead and service delay. As a result, packet certification delay time is increased 3.7% and throughput of certification server is increased 10.5%.