• Review of KIISC
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• v.28 no.2
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• pp.5-11
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• 2018

지능형 지속 위협(Advanced Persistent Threat) 공격은 Intrusion Kill Chain과 같은 일련의 단계로 구성되어 있기 때문에 특정 단계가 차단되면 공격은 실패하게 된다. Moving Target Defense(MTD)는 보호대상의 주요 속성(네트워크, 운영체제, 소프트웨어, 데이터)을 변화시켜 Intrusion Kill Chain을 구성하는 각 단계를 차단하는 능동적 사전 보안 기술이다. MTD 전략 중에서 네트워크 주소 변이(Network Address Mutation) 기술은 보호대상의 네트워크 주소(IP. Port)를 능동적으로 변이하는 기술로써, Intrusion Kill Chain의 첫 단계인 정찰(Reconnaissance) 행위에 소요되는 비용을 급격하게 증가시킬 수 있는 효율적인 보안 기술이다. 본 논문은 네트워크 주소 변이 기술 분야의 관련 연구들을 살펴보고 네트워크 주소 변이 기술 설계 시 고려해야하는 보안 요구사항과 기능 요구사항을 제안한다.

• Journal of Korea Multimedia Society
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• v.20 no.12
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• pp.1940-1950
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• 2017

The security threat types in underwater communication networks environment are almost the same as the terrestrial, but the security of mechanisms the terrestrial RF-based networks environment can not be directly applied due to not only the limited resources of each node but also unsafe channel such as low propagation delay, high bit error rate etc. Nevertheless there has not been much research on the security of underwater acoustic communication networks. Therefore, in this paper analyzes the differences between the terrestrial communication networks and underwater acoustic communication networks, and identifies issues that are the starting points of underwater communication networks security research.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.5 no.7
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• pp.1232-1237
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• 2001

The technology of the internet has made advanced progress the number of users increase rapidly. but, the technology doesn't only show users good and beautiful sides. the immoral hackers containing even children create computer viruses, and then spread them over network. so it makes the threat of viruses more serious. In this paper, we designed an improved blocking system against the infected file with viruses on router after analysing blocking systems against virus previously developed. comparising with other systems, the system designed is more efficient in terms of communication in complexity since it omits the transmission time between router and blocking system.

• Journal of Korea Society of Digital Industry and Information Management
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• v.11 no.1
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• pp.59-67
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• 2015

A novel authentication mechanism is biometric authentication where users are identified by their measurable human characteristics, such as fingerprint, voiceprint, and iris scan. The technology of biometrics is becoming a popular method for engineers to design a more secure user authentication scheme. In terms of physiological and behavioral human characteristics, biometrics is used as a form of identity access management and access control, and it services to identity individuals in groups that are under surveillance. In this article, we review the biometric-based authentication protocol by Althobati et al. and provide a security analysis on the scheme. Our analysis shows that Althobati et al.'s scheme does not guarantee server-to-user authentication. The contribution of the current work is to demonstrate this by mounting threat of data integrity and bypassing the gateway node on Althobati et al.'s scheme. In addition, we analysis the security vulnerabilities of Althobati et al.'s protocol.

• Journal of KIISE:Computing Practices and Letters
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• v.15 no.6
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• pp.430-434
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• 2009

In this paper, we propose an efficient content sharing scheme for structured P2P overlay network. The main idea of this paper is to exploit the identified routing table instead of anonymous one using social relationships among nodes. The contribution of this paper is to present a means of mitigating the problem of 'free riding' and the threat of misrouting attack by malicious nodes.

• Journal of Aerospace System Engineering
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• v.4 no.1
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• pp.19-22
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• 2010

The accuracy and integrity of global navigation satellite systems (GNSS) can be improved by using GNSS augmentation systems. Large ionospheric spatial gradient, during ionosphere storm, is a major threat for using GNSS augmentation systems by increasing the spatial decorrelation between a reference system and users. Ionosphere decorrelation behavior can be analyzed by using dual frequency GPS data. GNSS receivers have their own biases, called inter-frequency bias (IFB) between dual(P1 and P2) frequencies and they must be accurately estimated before computing ionosphere delays. GPS network data in Korea is used to compute each receiver's IFB, and their estimation accuracy and variability are analyzed. IFB estimation methodology to apply for ionosphere gradient analysis is discussed.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2017.05a
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• pp.314-316
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• 2017

Ransomware, a malicious program that requires money and then locks computers and files on network users for financial harvesting, will continue to evolve. Ransomware is a threat in mail systems that send and receive business information. By using Block Chain, Distributed Ledger technology, it is designed to be a safe mail system in which the automatically generated Ramsomware symptom data is directly linked to the security policy in the enterprise.

• Journal of the Korea Society of Computer and Information
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• v.22 no.5
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• pp.29-39
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• 2017

In this paper, we analyse security threats and security requirements about the designated PC solution which restricts usable PCs that are only an user own PCs or a registered PC for online banking or very important services. Accordingly, causable threats of the designated PC solution are classified a process, a network layer, a software module, and an environment of platform, and we draw security requirements based on analysed security threats. Results of this research are considered utilization of criteria for improving security of the designated PC solution and standards for giving hint of imposition of the designated PC solution.

• Convergence Security Journal
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• v.9 no.4
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• pp.35-41
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• 2009

Internet routing protocols currently in use in the typical protocol of the existing BGP protocol to strengthen the security of the BGP protocol by comparison with research on emerging issues of the AS-Path, IP Fake, DRDoS BGP protocol must be used when such the information you need, but due to malicious attack, or an incorrect setting can prevent the global Internet network operating in an security to threat information are analyzed.

• KEPCO Journal on Electric Power and Energy
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• v.1 no.1
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• pp.55-59
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• 2015

Denial of Service (DoS) attack is to interfere the normal user from using the information technology services. With a rapid technology improvements in computer and internet environment, small sized DoS attacks targeted to server or network infrastructure have been disabled. Thus, Distributed Denial of Service (DDoS) attacks that utilizes from tens to several thousands of distributed computers as zombie PC appear to have as one of the most challenging threat. In this paper, we categorize the DDoS attacks and classify existing countermeasures based on where and when they prevent, detect, and respond to the DDoS attacks. Then we propose a comprehensive defense mechanism against DDoS attacks in Control System to detect attacks efficiently.