• Review of KIISC
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• v.14 no.4
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• pp.10-18
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• 2004

상호운영성, 유연성, P2P(피어투피어), 역동성, 확장성 등 웹 서비스가 지닌 다양한 특성으로 인하여 웹 서비스 보안은 안전한 웹 서비스 운영을 위한 핵심요소라 할 수 있다. 웹 서비스의 기본 구성은 서비스 수요자와 제공자, 검색소로 구성되며 WSDL(Web Service Definition Language), UDDI(University Discovery and Integration of Business for Web), SOAP(Smple Object Access Protocol)등 세 개의 표준으로 서비스는 이루어진다. 이 중에서 특히 메시지 교환을 담당하는 통신 프로토콜인 SOAP는 웹 서비스 보안의 중심에 있으며, 웹 서비스 보안은 SOAP 메시지의 사용자 인증과 무결성, 기밀성을 보장하는 것으로 정의할 수 있다. SOAP는 HTTP를 통해 일반적으로 전송되므로 HTTP 상의 모든 위협을 가지게 되며 전송계층에 기반을 둔 보안을 생각할 수 있지만, 사실상 웹 서비스는 다수의 중간 중개자를 가질 수 있는 구조이기 때문에 단대단 보안(메시지 레벨의 보안)이 반드시 필요하다. 또한, 웹 서비스 상에서 단대단 보안을 보장하기 위해서는 각 객체와 키와의 연결이 중요하며 특정 객체에게 발행한 보안토큰의 신뢰성 화보를 위한 메카니즘을 필요로 한다. 본 논문에서는 이러한 보안 요구사항을 만족하기 위하여 XML 메시지 보안을 위한 전자서명 및 암호화 표준과 SOAP을 위한 W3C, OASIS의 통합표준을 중심으로 SOAP 메시지 보안기술을 분석하고자 한다.

• Journal of Auto-vehicle Safety Association
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• v.9 no.2
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• pp.33-39
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• 2017

In recent days, crash safety system based on vehicle-to-vehicle communication (V2V) has been legislated. This V2V based safety system collects information from nearby vehicles to predict any crash possibility. Thus, it requires accurate and reliable data. Regularly updated features of Basic Safety Message(BSM) will be used to test validity of various elements included in the BSM. Then, the focus was made on whether values of these elements had notable differences compared to previous values. Through this paper, the validation tool was implemented and the result from V2V OBU experiment was used to identify problems in the current model and additional features that need to be implemented in V2V OBU for more accurate BSM.

• Journal of Navigation and Port Research
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• v.33 no.6
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• pp.423-428
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• 2009

Recently, the marine traffics have been increased along with enlargement of overseas commerce. Increasing the marine traffic may make higher the risk of marine accidents. Especially, the rate of accidents on costal area are more frequently. As if the marine safety information can be afforded to vessel and shore, the accident rate would be down. AIS AtoN is the navigational safety support device which is subject to functional requirements of IALA and technical standards of ITU. In this paper, we extend and implement the user-defined specification of AIS AtoN with message 21 for AIS basic information, messsage 6 for status report and message 12/14 for safety management.

• Journal of Auto-vehicle Safety Association
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• v.15 no.2
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• pp.28-34
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• 2023

The Republic of Korea aims to complete the commercialisation of Level 4+ cooperative autonomous driving in 2027. It also plans to include V2X OBU in the K-NCAP evaluation items. Therefore, communication performance safety evaluation criteria for V2X OBU need to be established, and an OBU with necessary functions is needed to develop V2X communication performance safety evaluation technology for vehicles. In this study, we implemented a V2X OBU control board prototype that can be used to develop a V2X communication performance safety evaluation technology for Level 4+ autonomous vehicles, and confirmed that the control board prototype works normally.

• KIPS Transactions on Computer and Communication Systems
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• v.6 no.4
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• pp.203-210
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• 2017

Address resolution protocol (ARP) is used for binding a logical address to a physical address in many network technologies. However, since ARP is an stateless protocol, it always abused for performing ARP-based attacks. Researchers presented many technologies to improve ARP protocol, but most of them require a high implementation cost or scarify the network performance for improving security of ARP protocol. In this paper, we present an address auto-resoultion (AAR) network system to neutralize the ARP-based attacks. The AAR turns off the communication function of ARP messages(e.g. request and reply), but does not disable the ARP table. In our system, the MAC address of destination was designed to be derived from destination IP address so that the ARP table can be managed statically without prior knowledge (e.g., IP and MAC address pairs). In general, the AAR is safe from the ARP-based attacks since it disables the ARP messages and saves network traffics due to so.

• Journal of the Korea Society of Computer and Information
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• v.10 no.2 s.34
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• pp.39-47
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• 2005

This paper proposes and analyzes the MAC(Message Authentication Code) algorithm that is used for the transition integrity and the entity authentication of message. The MAC algorithm uses the DES algorithm which has 64-bit block and 56-bit key and we compare the security according to 64-bit and 32-bit length of MAC value. Moreover, we use the SEED algorithm which has 128-bit block and 128-bit key and compare the security according to 128-bit and 64-bit length of MAC value. We analyze the security the forgery attack according to length of message and length of MAC value. this paper, a coarse-to-fine optical flow detection method is proposed. Provided that optical flow gives reliable approximation to two-dimensional image motion, it can be used to recover the three-dimensional motion. but usually to get the reliable optical flows are difficult. The proposed algorithm uses Horn's algorithm (or detecting initial optical flow, then Thin Plate Spline is introduced to warp a image frame of the initial optical flow to the next image frame. The optical flow for the warped image frame is again used iteratively until the mean square error between two image sequence frames is lowered. The proposed method is experimented for the real moving Picture image sequence. The proposed algorithm gives dense optical flow vectors.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2014.10a
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• pp.624-627
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• 2014

In vehicular network, the basic goal is to provide vehicle safety service and commercial service such as ITS(Intelligent Transportation System) or video, etc on the road. And most research concentrated on transportation of safety message in congestion situation. It is important to allocate channel for safety message in congestion situation, but providing suitable service is also important problem in vehicular network. For this reason, IEEE 1609.4 allocate 4 multiple service channels (SCHs) for non-safety data transfer. But, in congestion situation with many vehicles, the contention for channel acquisition between services becomes more severe. So services are provided improperly because of lack of service channel. This paper suggests dynamic channel allocation algorithm. The proposed algorithm is that RSU(RaodSide Unit) maintain and manage the information about service and status of channels. On based of the SJF(Shortest Job First) scheduling using those information, RSU selects the most appropriate channel among the 4 SCHs allocated by IEEE 1609.4 in network congestion situation.

• Journal of Auto-vehicle Safety Association
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• v.13 no.1
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• pp.26-30
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• 2021

K-city is an experimental area for developing self-driving cars. V2X communications such as WAVE, C-V2X and 5G are an essential technology for autonomous driving above level 4. In this paper, the research on the V2V communication environment was carried out through BSM receiving level analysis on the driving route in K-city. A stationary vehicle communicated with a test vehicle moving along urban area and suburban road in two different scenarios. The communication range and receiving levels obtained from this study will be used to develop and verify various safety scenarios using V2V communication within K-city in the future.

• Proceedings of the Korean Information Science Society Conference
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• 2003.10a
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• pp.658-660
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• 2003

경매 프로토콜의 우수성은 보안성, 효율성, 안정성의 측면에 있다. 기존에 제안된 경매 프로토콜은 보안을 강화함으로 인해 많은 계산량과 메시지 전승이 요구되어 높은 트래픽을 발생한다. 또한 경매의 규모가 커짐에 따라 Auctioneer의 부담이 가중된다. 본 논문에서는 다항함수의 특성과 개인 정보 분할을 통해 기존의 보안성을 유지하면서도 효율성을 높인 경매 프로토콜 PAP를 제안하고자 한다. 효율성을 높이기 위해 곱연산을 피하고 xor연산을 이용하여 계산량을 줄이고. 안전성을 높이기 위해 다항함수(Polynomial)의 기본 성질을 이용해서 Bidder들의 정보를 분할한다. 제안한 경매 프로토콜은 계산량을 줄이면서도 Bidder들의 정보는 보호된다.

• Journal of Auto-vehicle Safety Association
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• v.12 no.4
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• pp.48-53
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• 2020

This paper describes in work which is currently underway to the minimum safety performance requirements and test methods of V2V based on IEEE 802.11p in vehicle level like below. - The ranges and positions at static and driving condition of vehicle for BSM (Basic safety message) - Various road conditions such as straight road, crossroad, slope-way Based on this study, We will define the minimum safety performance requirements and test methods of V2V in vehicle considering various road conditions.