• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.10
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• pp.732-742
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• 2016

This study suggests methods of defense against low-level high-bandwidth DDoS attacks by adding a solution with a time limit factor (TLF) to an existing high-bandwidth DDoS defense system. Low-level DDoS attacks cause faults to the service requests of normal users by acting as a normal service connection and continuously positioning the connected session. Considering this, the proposed method makes it possible for users to show a down-related session by considering it as a low-level DDoS attack if the abnormal flow is detected after checking the amount of traffic. However, the service might be blocked when misjudging a low-level DDoS attack in the case of a communication fault resulting from a network fault, even with a normal connection status. Thus, we made it possible to reaccess the related information through a certain period of blocking instead of a drop through blacklist. In a test of the system, it was unable to block the session because it recognized sessions that are simply connected with a low-level DDoS attack as a normal communication.

• Convergence Security Journal
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• v.20 no.4
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• pp.91-101
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• 2020

We analyzed APT attack cases that occurred overseas in the past using a cyber kill chain model and a TTP model. As a result of the analysis, we found that the cyber kill chain model is effective in figuring out the overall outline, but is not suitable for establishing a specific defense strategy, however, TTP model is suitable to have a practical defense system. Based on these analysis results, it is suggested that defense technology development which is based on TTP model to build defense-in-depth system for preparing cyber attacks.

• Proceedings of the Korea Information Processing Society Conference
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• 2005.05a
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• pp.1225-1228
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• 2005

본 논문에서는 DDoS 공격 패킷을 사전에 탐지하고 트래픽 제어를 하기위한 방안을 제안한다. 제안된 모델은 공격대상에서 멀리 떨어 진 라우터에서 낮은 임계치를 적용하여 탐지 하게 되며 지역 연합 모델을 통한 지역적인 방어 행동을 취하게 된다. 사전에 취해지는 방어 행동으로 인해 본 시스템은 좋은 성능을 발휘 할 것이다. 시스템의 각 지역연합들은 DDoS 공격의 악의 적인 트래픽의 양을 줄이는 것에 기여 할 것이다.

• Defense and Technology
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• no.10 s.140
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• pp.54-63
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• 1990

오늘의 세계에서 대미사일 방어시스템의 절박한 필요성의 한 예로 이스라엘을 지적하고 싶다. 이스라엘군의 용감성과 용기에도 불구하고, 만일 그들의 적이 이스라엘 영토내의 도시와 주요 시설들을 파괴할수 있는 미사일을 발사한다면, 전선에서의 성공도 위태롭게 될 것이다. 이와같은 일이 벌어진다면 이스라엘은 치명적인 타격을 입게될 것이다. 이 악몽은 적의 미사일이 이스랑엘 영토내에 도달하기전에 요격할수 있는 시스템의 개발을 서두른다면 피할수도 있을 것이다. 유럽도 이와 유사한 상황에 처해 있다. 우리가 재빨리 행동하지 않는다면 잠재적 침략자가 유리한 고지를 점령하는 것을 막지 못할 것이다.

• Proceedings of the Korea Multimedia Society Conference
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• 2004.05a
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• pp.521-524
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• 2004

인터넷 사용자의 급증에 따라, 인터넷을 통한 다양한 해킹 및 불순한 의도를 지닌 공격에 의한 침해사고 역시 크게 증가되고 있다. 이러한 해킹의 피해로부터 네트워크 시스템 및 서버를 보호하기 위해 각종 보안강화 시스템이 개발되어 운용되고 있으나, 현재 사용 중인 보안강화 도구들은 수동적인 방어 위주로 공격자의 해킹 시도 자체를 제한하는 것이 아니라 해킹이 시도된 후 대처하는 제약 등으로 해킹 자체를 방지하는데는 한계를 가지고 있다. 능동적인 해킹 방어를 위한 가장 기본적인 기술은 해커의 실제 위치를 추적하는 역추적 시스템이라 할 수 있다. 현재 이에 대한 연구가 활발히 진행 중에 있다. 따라서 본 논문에서는 능동적인 해킹 방어를 위한 역추적 시스템을 분석하고, 리눅스 기반의 역추적 시스템을 설계하였다.

• 대한방사선방어학회:학술대회논문집
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• 2011.04a
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• pp.142-143
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• 2011

• Journal of Internet Computing and Services
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• v.23 no.4
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• pp.87-94
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• 2022

Recently, with the development of information and communication infrastructure, the number of Internet access devices is rapidly increasing. Smartphones, laptops, computers, and even IoT devices are receiving information and communication services through Internet access. Since most of the device operating environment consists of web (WEB), it is vulnerable to web cyber attacks using web shells. When the web shell is uploaded to the web server, it is confirmed that the attack frequency is high because the control of the web server can be easily performed. As the damage caused by the web shell occurs a lot, each company is responding to attacks with various security devices such as intrusion prevention systems, firewalls, and web firewalls. In this case, it is difficult to detect, and in order to prevent and cope with web shell attacks due to these characteristics, it is difficult to respond only with the existing system and security software. Therefore, it is an automated defense system through the collection and analysis of web shells based on artificial intelligence machine learning that can cope with new cyber attacks such as detecting unknown web shells in advance by using artificial intelligence machine learning and deep learning techniques in existing security software. We would like to propose about. The machine learning-based web shell defense system model proposed in this paper quickly collects, analyzes, and detects malicious web shells, one of the cyberattacks on the web environment. I think it will be very helpful in designing and building a security system.

• Journal of Aerospace System Engineering
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• v.16 no.5
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• pp.43-48
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• 2022

The Kinzal missile launched by Russia in Ukraine and flew on March 5 or more speeds is the first hypersonic cruise missile used in combat. High speed leads to destructive solid power, and the security system's interception time is significantly reduced. Therefore, hypersonic missiles could be a game-changer. Even the United States, with its multi-layered defense system, admits the difficulty of intercepting it. Military powers like the United States, Russia, China and North Korea are focus on developing hypersonic missiles as offensive weapons, but their defense system capabilities are inadeqate. From this perspective, this paper identifies significant countrie's hypersonic missile development status and defense system capabilities and seeks to derive a countermeasure for the ROK military.

• The Journal of the Korea institute of electronic communication sciences
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• v.7 no.5
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• pp.1041-1051
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• 2012

Attack on Cloud Computing, an intensive service solution using network infrastructure recently released, generates service breakdown or intrusive incidents incapacitating developmental platforms, web-based software, or resource services. Therefore, it is needed to conduct research on security for the operational information of three kinds of services (3S': laaS, PaaS, SaaS) supported by the Cloud Computing system and also generated data from the illegal attack on service blocking. This paper aims to build a system providing optimal services as a 4-stage defensive method through the test on the attack and defense of Cloud Computing services. It is a defense policy that conducts 4-stage, orderly and phased access control as follows: controlling the initial access to the network, controlling virtualization services, classifying services for support, and selecting multiple routes. By dispersing the attacks and also monitoring and analyzing to control the access by stage, this study performs defense policy realization and analysis and tests defenses by the types of attack. The research findings will be provided as practical foundational data to realize Cloud Computing service-based defense policy.

• 대한방사선방어학회:학술대회논문집
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• 2009.04a
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• pp.282-283
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• 2009