• Journal of information and communication convergence engineering
• /
• v.8 no.2
• /
• pp.238-243
• /
• 2010

CSD is Active RFID based Container Security Device which is proposed by the U.S Department of Home Security. It is mounted inside the container to sense opening of the container door. ConTracer is the CSD which is developed in this research whose major features are sensing door opening status as well as history inquiring on internal environment and shock to the container by mounting the temperature/ humidity/ shock sensors. Moreover, its RFID frequency bandwidth uses 433MHz and 2.4GHz to correspond actively to the frequency used by different countries. This paper introduces the development trend of CSD, compares the ConTracer which is developed thru this research and other company's CSD, and introduces CSD System which is designed and established using ConTracer. Finally, the implemented CSD System is verified by applying the demonstration service to container distribution between Korea and China.

• Journal of Power Electronics
• /
• v.15 no.1
• /
• pp.86-95
• /
• 2015

An active clamp high step-up boost converter with a coupled inductor is proposed in this paper. In the proposed strategy, a coupled inductor is adopted to achieve a high voltage gain. The clamp circuit is included to achieve the zero-voltage-switching (ZVS) condition for both the main and clamp switches. A rectifier composed of a capacitor and a diode is added to reduce the voltage stress of the output rectifier diode. As a result, diodes with a low reverse-recovery time and forward voltage-drop can be utilized. Since the voltage stresses of the main and clamp switches are far below the output voltage, low-voltage-rated MOSFETs can be adopted to reduce conduction losses. Moreover, the reverse-recovery losses of the diodes are reduced due to the inherent leakage inductance of the coupled inductor. Therefore, high efficiency can be expected. Firstly, the derivation of the proposed converter is given and the operation analysis is described. Then, a steady-state performance analysis of the proposed converter is analyzed in detail. Finally, a 250 W prototype is built to verify the analysis. The measured maximum efficiency of the prototype is 95%.

• The KIPS Transactions:PartC
• /
• v.9C no.6
• /
• pp.799-808
• /
• 2002

According to the wide-spread of information transmission system over network, the use of cryptographic system to provide the integrity of transmitted message over network is increasing and the importance of that is emphasized. Because the security of the cryptographic system totally relies on the key, key management is a essential part of cryptographic system. A number of key agreement protocols have been proposed to far, but their rigorous security analysis is still open. In this paper, we analyze the features of Diffie-Hellman based standard key agreement protocols and provide the security analysis of those protocols against several kinds of active attacks.

• Journal of the Korea Institute of Information Security & Cryptology
• /
• v.13 no.5
• /
• pp.113-127
• /
• 2003

WTLS as secure protocol of WAP makes TLS that is used in wireless Intemet protocol for TCP security be appropriate for wireless environments. And purpose of WTLS is to provide safe and efficient services. WTLS protocol consists of 4 protocols(Handshake, ChangeCipherSpec, Alert, Application Data etc.). In this papers we analyze properties of Handshake protocol and procedures of establishing master secret in detail. And then we analyze securities against several attacker models with them for a basis. Also we propose new Handshake protocol that is secure against active attacker model and can provide various security services.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
• /
• v.16 no.3
• /
• pp.7-14
• /
• 2002

The economic dispatch is one of the major concerns in case of buying and selling generated powers between electric powers companies. This paper describes the power system security the optimal power flow, and the security-constrained economic dispatch and shows the EDSA\`s active optimal power flow software package is well suited through a simple case study.

• International Journal of Computer Science & Network Security
• /
• v.22 no.12
• /
• pp.212-216
• /
• 2022

Space based constellation network is a kind of ad hoc network in which users are self-organized without center node. In space based constellation network, users are allowed to enter or leave the network at any given time. Thus, the number of active users is an unknown and time-varying parameter, and the performance of the network depends on how accurately this parameter is estimated. The so-called problem of active user identification, which consists of determining the number and identities of users transmitting in space based constellation network is discussed and a novel active user identification method is proposed in this paper. Active user identification code generated by transmitter address code and receiver address code is used to spread spectrum. Subspace-based method is used to process received signal and judgment model is established to identify active users according to the processing results. The proposed method is simulated under AWGN channel, Rician channel and Rayleigh channel respectively. Numerical results indicate that the proposed method obtains at least 1.16dB E_b/N₀ gains compared with reference methods when miss alarm rate reaches 10^-3.

• Journal of the Korea Institute of Information Security & Cryptology
• /
• v.32 no.1
• /
• pp.141-154
• /
• 2022

In the data economy era, various policies are being implemented to create an active data distribution environment. In South Korea, the formation of a big data distribution platform and data trading began with the launch of the Financial Data Exchange under public data governance. In the case of major advanced countries in the data field, they have built a data distribution environment based on the data broker industry for decades and have strengthened national data competitiveness through added values generated from the industry. However, behind the active data distribution through data brokers, there are numerous information security issues, which have resulted in various privacy issues and national security threats. These problems can occur sufficiently in the process of domestic financial data exchange. In our study, we analyzed various information security issues of data trading caused by data brokers and derived information security requirements to be considered when trading data. We verified whether information security requirements are well reflected in the information security policy for each transaction stage of the domestic financial data exchange. Based on the verification, measurements to strengthen information security for financial data exchange are presented in our paper.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• v.8 no.10
• /
• pp.3624-3637
• /
• 2014

At SAC 2004, Junod and Vaudenay designed the FOX family based on the Lai-Massey scheme. They noted that it was impossible to find any useful differential characteristic or linear trail after 8 rounds of FOX64 or FOX128. In this paper, we provide the lower bound of differentially active S-boxes in consecutive rounds of the Lai-Massey scheme that has SPS as its F-function, and we propose the necessary conditions for the reachability of the lower bound. We demonstrate that similar results can be obtained with respect to the lower bound of linearly active S-boxes by proving the duality in the Lai-Massey scheme. Finally, we apply these results to FOX64 and FOX128 and prove that it is impossible to find any useful differential characteristics or linear trail after 6 rounds of FOX64. We provide a more precise security bound for FOX128.

• Proceedings of the Korea Multimedia Society Conference
• /
• 2001.06a
• /
• pp.492-495
• /
• 2001

다양한 네트워크 시스템이 구축됨에 따라 시스템 해킹 사례도 비례해서 증가하고 있다. 점차 분산화, 자동화, 에이전트화되고 있는 공격 기법에 대하여, 본 논문에서는 최근 네트워크를 통하여 이루어지는 시스템 공격 기법을 살펴보고 그 동향을 분석한다. 그리고, 이를 효과적으로 대응하고 방어할 수 있는 새로운 개념인 능동 보안(Active Security)의 개념을 살펴보고, 핵심 기술인 이동 에이전트의 도입 및 적용에 대하여 논의한다.

• Review of KIISC
• /
• v.16 no.5
• /
• pp.72-83
• /
• 2006

XML기반 웹서비스의 활성화와 더불어 효율적인 데이터 호출 및 통합을 위해, XML 문서 안에 웹서비스 호출 노드를 내장할 수 있는 Active XML(AXML) 문서가 개발되었다. 본 논문에서는 기존 전송계층 보안 프로토콜 및 WS-Security의 제한점을 방지하기 위한, AXML 문서의 내장형 웹서비스 호출과 XML-Encryption 및 XML-Signature 보안 표준을 통합한 데이터 암호화 및 전자서명 방식에 대해 소개한다. 또한, '전자의료 시스템' 예제를 통해 AXML 문서를 이용한 중첩된 웹서비스 호출 및 쿼리위임 방식에 대해 소개한다. 마지막으로, 기존 보안성 정형분석 방법의 확장을 통한 AXML 시스템의 보안 취약 가능성에 대해 언급하고자 한다.