• Journal of the Korean Society for Aviation and Aeronautics
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• v.23 no.2
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• pp.57-62
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• 2015

As the issuance of type certificate and production certificate for KC-100 Naraon, Korea is ranked as the State of Design and the State of Manufacture for civil aircraft specified in the Convention on International Civil Aviation. It means that another responsibilities are imposed and new frameworks are required for the airworthiness management including the continuing airworthiness. So far the minimum airworthiness management system was sufficient as the State of Registry for the aircraft operations and safety management. However, we need to establish and maintain the airworthiness management system for the effective certification and oversight of our air operators and approval holders. This paper introduces the new obligations under the Convention on International Civil Aviation, reviews the current aviation regulations and procedures and presents the strategy for the establishment of the regulatory system to ensure the airworthiness of aircraft.

• Journal of the Korea Society of Computer and Information
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• v.22 no.9
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• pp.49-55
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• 2017

Despite the Openflow's switch migration occurs after the channel was established in secure manner (optional), the current cryptography protocol cannot prevent the insider attack as the attacker possesses a valid public/private key pair. There are methods such as the certificate revocation list (CRL) or the online certificate status protocol (OCSP) that tries to revoke the compromised certificate. However, these methods require a management system or server that introduce additional overhead for the communication. Furthermore, these methods are not able to mitigate power abuse of an insider. In this paper, we propose a role-based identity-based cryptography (RB-IBC) that integrate the identity of the node along with its role so the nodes within the network can easily mitigate any role abuse of the nodes. Besides that, by combining with IBC, it will eliminate the need of exchanging certificates and hence improve the performance in a secure channel.

• Journal of the Korea Society of Computer and Information
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• v.22 no.12
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• pp.109-116
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• 2017

Short-lived pseudonym certificates as vehicle identities could satisfy both security and privacy requirements. However, to remove revoked certificates especially in vehicle communications, pseudonym certificate revocation list (CRL) should be distributed resource-efficiently from a practical deployment point of view and in a timely manner. In this paper, we propose a novel CRL distribution scheme capable of CRL multicast to only activated vehicles registered to the CRL multicast group using the group communication system enabler, namely, the GCSE which is being standardized. The scheme is resource efficient by using CRL distribution paths instead of paging processes to find out multicast vehicle(s) within a certain region. The analyzed results show that the proposed scheme outperforms in terms of paging cost, packets transmission cost, and the processing cost at the respective entities compared to the existing four schemes in the literature.

• Journal of Internet Computing and Services
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• v.9 no.4
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• pp.69-77
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• 2008

I propose adding users’Media Access Control (MAC) addresses to standard X.509 certificates to provide more secure authentication. The MAC address can be added by the issuing Certification Authority (CA) to the "extensions" section of the X.509 certificate. I demonstrate that when two users with MAC address information on their digital certificates communicate, the MAC address on the first user’s certificate can be easily verified by the second user. In this way, security can be improved without markedly degrading system performance and the level of initial trust between participants in virtual communities will be improved.

• Proceedings of the Korea Information Processing Society Conference
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• 2003.05c
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• pp.2077-2080
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• 2003

일반적으로 기존의 도메인으로부터 인증서를 검증하는 방법은 CRL(Certificate Revocation List), OCSP(Online Certificate Status Protocol), Freshest CRL, Delta CRL등이 있으나 CRL 검증 방식에 대해서 여러 단점이 부각되었다. 현재 CRL 검증 방법에 대해서 효율적으로 검증하기 위한 방안이 OCSP, Delta CRL등이 제시하여 서비스를 하고 있는 실정이다. 피러나 이런 검증 서비스 시스템에도 한계성이 드러나게 되었고 그 단점을 보완하기 위한 검증 시스템을 채택하여 기존의 인증서 검증 서비스보다 효율적이고 안정적인 시스템을 구현하기 위해 CSMS(Certificate Status Management Server)를 제시한다. CSMS는 OCSP와 같이 실시간으로 검증과 빠른 서비스로 USER에게로의 응답을 위한 서비스를 제공함으로써 전자상거래를 통한 트랜젝션에 적합한 시스템을 위한 것이다.

• Journal of the Korea Society of Computer and Information
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• v.21 no.1
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• pp.91-99
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• 2016

A certificate revocation list(CRL) should be distributed quickly to all the vehicles in the network to protect them from malicious users and malfunctioning equipments as well as to increase the overall security and safety of vehicular networks. However, a major challenge is how to distribute CRLs efficiently. In this paper, we propose a novel Regional CRL distribution method based on the vehicle location registration locally to manage vehicle mobility. The method makes Regional CRLs based on the vehicles' location and distributes them, which can reduce CRL size and distribution time efficiently. According to the simulation results, the proposed method's signaling performance of vehicle's registration is enhanced from 22% to 37% compared to the existing Regional CRL distribution method. It's CRL distribution time is also decreased from 37% to 67% compared to the existing Full CRL distribution method.

• Proceedings of the Korean Information Science Society Conference
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• 2002.10c
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• pp.550-552
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• 2002

인증서기반의 인터넷뱅킹과 온라인증권거래에서, 금융거래 서비스 제공자는 많은 사용자의 인증서상태 검증이 요구된다. 금융거래 서비스는 사용자 인증서상태를 실시간의 검증이 보장되어야 한다. 인증서 상태 검증을 위해 기존의 CRL(Certificate Revocation List), Delta CRL, Freshest CRL과 실시간 인증서상태 검증을 위하여 OCSP(Online Certificate Status Protocol)의 표준이 제안된 바 있다. 실시간성과 검증속도는 상호 대비되기 때문에 응용프로그램의 특성을 고려하여 인증서상태 검증방법을 채택한다. 본 논문에서는 CRL의 갱신되기 이전의 폐지에 대하여 실시간으로 전송하는 시스템을 설계한다. 제안하는 인증서폐지 전송서버는 서명자의 검증자 리스트를 관리하여 금융거래 사용자가 CA에 폐지를 요청하면 사용자가 이용하는 금융거래 서비스 제공자들에게 실시간으로 폐지를 고지한다. 본 논문은 CRL 생성이후 갱신까지의 인증서 폐지정보를 검증자에게 전송하여 인증서의 실시간 상태정보를 유지하면서 OCSP보다는 검증속도를 향상시켜 금융거래 환경에서 향상된 효율성을 제공한다.

• KSCI Review
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• v.14 no.1
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• pp.221-228
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• 2006

In this paper we propose an active learning method that makes a database for the information about certificates and practical examinations and accesses it easily. First of all, this method makes it possible to evaluate students individually, improves the motive of learning and gives students a sense of achievement by providing a user-specific question filtering technique using user pronto information by weight. And, it elevates the acquisition rate of certificates by advising and managing for certificate-acquisition and it also draw more interest and understanding for future directions.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.10 no.2
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• pp.3-12
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• 2000

In this paper we propose a new algorithm which resolves the inconsistency problems occurring when DNS severs are employed as elements of PKI. The inconsistency may take place between primary name servers and secondary name servers and between cached certificate and original certificate. The former can be removed by adapting RFC 1996 NOTIFY opcode for DNS. In order to eliminate the latter type of inconsistency we develope a new algorithm which is implemented with two additional RR(Resource Record). The present algorithm is designed such that DNS contacts the destination DNS prior to returning public key to users. Therefore the inconsistency problem occurring when DNS is operated as PKI can be eliminated by using the proposed adaptation and algorithm.

• Journal of Applied Reliability
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• v.15 no.2
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• pp.101-107
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• 2015

In this paper, we review the domestic reliability standards and its global counterparts IEC/TC 56 international reliability standards. Recently private transfers of reliability certification control tower has established in Korea. Some check points to consider regarding the control tower transfer process to the non-government organization are suggested. Also the IEC/TC 56 and its relevant reliability standards are introduced. Understanding of the IEC/TC56 system will be helpful for the time of non-government organization control tower transfer in the reliability certificate specification