• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2016.05a
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• pp.317-320
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• 2016

The NH-NongHyup network and servers were paralyzed in 2011, in the 2013 3.20 cyber attack happened and Classified documents of Korea Hydro & Nuclear Power Co. Ltd were leaked on December in 2015. All of them were conducted by a foreign country. These attacks were planned for a long time compared to the script kids attacks and the techniques used were very complex and sophisticated. However, no successful solution has been implemented to defend an APT attack thus far. Therefore, we will use big data analytics to analyze whether or not APT attack has occurred in order to defend against the manipulative attackers. This research is based on the data collected through ISAC monitoring among 3 hierarchical Korean defense system. First, we will introduce related research about big data analytics and machine learning. Then, we design two big data analytics models to detect an APT attack and evaluate the models' accuracy and other results. Lastly, we will present an effective response method to address a detected APT attack.

• Journal of Internet Computing and Services
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• v.23 no.6
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• pp.1-13
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• 2022

As the information and communication environment develops, the environment of military facilities is also development remarkably. In proportion to this, cyber threats are also increasing, and in particular, APT attacks, which are difficult to prevent with existing signature-based cyber defense systems, are frequently targeting military and national infrastructure. It is important to identify attack groups for appropriate response, but it is very difficult to identify them due to the nature of cyber attacks conducted in secret using methods such as anti-forensics. In the past, after an attack was detected, a security expert had to perform high-level analysis for a long time based on the large amount of evidence collected to get a clue about the attack group. To solve this problem, in this paper, we proposed an automation technique that can classify an attack group within a short time after detection. In case of APT attacks, compared to general cyber attacks, the number of attacks is small, there is not much known data, and it is designed to bypass signature-based cyber defense techniques. As an attack model, we used MITRE ATT&CK® which modeled many parts of cyber attacks. We design an impact score considering the versatility of the attack techniques and proposed a group similarity score based on this. Experimental results show that the proposed method classified the attack group with a 72.62% probability based on Top-5 accuracy.

• Journal of the Korea Society of Computer and Information
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• v.25 no.9
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• pp.71-80
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• 2020

As societies become hyperconnected, we need more cyber security experts. To this end, in this paper, based on the analysis results of the real world cyber attacks and the MITRE ATT&CK framework, we developed CyTEA that can model cyber threats and generate simulated cyber threats in a cyber security training system. In order to confirm whether the simulated cyber threat has the effectiveness of the actual cyber threat level, the simulation level was examined based on procedural, environmental, and consequential similarities. in addition, it was confirmed that the actual defense training using cyber simulation threats is the same as the expected defense training when using real cyber threats in the cyber security training system.

• Convergence Security Journal
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• v.13 no.4
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• pp.3-10
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• 2013

Cyber attacks are threats to national security. Today, cybersecurity threats have various types, the theft or spread of privacy and national secret, the realization of direct attacks to infrastructure and the hacktivism with political or social objectives. Furthermore, There are special situations in South Korea because of North Korea's threats. Thus, It is necessary to handle cybersecurity as a kind of national security problem. It is a time to identify problems of governance system in cybersecurity and to improve related Acts and subordinate statutes. There are several tasks for legal improvement for governance system in cybersecurity. They are improving legal bases for the roles of the relevant authorities in cybersecurity, consolidating national joint response to cyber accidents, establishing and vitalizing information sharing system, constructing foundation of cybersecurity through industry promotion and manpower development, and acquiring defensive tools by enhancement research an development. In order to address these challenges, it is necessary to pay much attention to enactment and to revision laws and to practice legislative procedure.

• Journal of Digital Convergence
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• v.17 no.10
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• pp.93-102
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• 2019

This paper aims to set the priorities for the cybersecurity strategy of Cambodian government. To this end, we built a AHP research model by adopting 4 factors from the ITU national interests model and selecting 7 strategies from best practices of 8 countries leading the cyber security. Using a questionnaire, 19 experts evaluated Cambodia's cybersecurity strategy priorities. The key policy factors were evaluated in the order of homeland defense, economic welfare, value promotion and favorable world order. Their strategic alternatives were identified in the order of legislation, capacity building, and cyber attack prevention for critical infrastructure. This study will contribute to setting the strategic priorities and feasible action plans to strengthen Cambodia's cybersecurity capabilities.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.30 no.6
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• pp.1167-1187
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• 2020

We are facing the situation where cyber threats such as hacking, malware, data leakage, and theft, become an important issue in the perspective of personal daily life, business, and national security. Although various efforts are being made to response to the cyber threats in the national and industrial sectors, the problems such as the industry-academia skill-gap, shortage of cybersecurity professionals are still serious. Thus, in order to overcome the skill-gap and shortage problems, we propose a Cybersecurity technical response Job Competency(CtrJC) framework by adopting the concept of cybersecurity personnel's job competency. As a sample use-case study, we implement the CtrJC against to personals who are charged in realtime cybersecurity response, which is an important job at the national and organization level, and verify the our framework's effects. We implement a sample model, which is a CtrJC against to realtime cyber threats (We call it as CtrJC-R), and study the verification and validation of the implemented model.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2013.10a
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• pp.165-168
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• 2013

The USA has declared the cyber space as the 5th battlefield following land, sea, air, and space. In contrast to physical wars, in national cyberwarfare differentiation between friend and foe is impossible, and the boundaries between the lines of attack and defense are obscure. Therefore, to perform national cyberwarfare, credibility of all command delivery information performed in the cyber space should be confirmed. In this paper, the authors have determined the commands performed in national cyberwarfare, granted authorized IPv6 in space including the earth, moon and Mars for information credibility, and used LINK joints loaded with stealth functions to secure the credibility of command information.

• Electronics and Telecommunications Trends
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• v.28 no.3
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• pp.19-29
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• 2013

최근 외부 해킹으로 대량의 개인정보 유출, 대규모 시스템 장애 등 사고가 빈번히 발생하고 있다. 특히, 보안체계를 잘 갖추고 있던 조직들도 APT(Advanced Persistent Threat) 공격과 같이 지속적으로 특정 표적을 목표로 하는 공격 앞에 무력하게 당하는 사건들을 접하면서 많은 기업 및 조직들이 대응 방안 마련에 고심하고 있다. 본고에서는 사이버테러, 사이버전(戰), 핵티비즘 등의 공격방법으로 활용되고 있는 사이버 표적공격 위협에 대한 방어 기술로서 최근 관심을 받고 있는 빅데이터 처리 기술을 기반으로 다중소스 데이터 수집 분석을 통한 지능형 보안 기술에 대한 개념과 관련 기술 및 제품의 동향에 대하여 살펴본다.

• 한국IT서비스학회:학술대회논문집
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• 2003.11a
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• pp.558-565
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• 2003

오늘날 대부분의 컴퓨터 시스템에 대한 사이버 공격은 특정 어플리케이션이 제기능을 발휘하지 못하도록 하기 위한 의도로 행해진다. 이러한 사이버 공격을 방어하기 위한 현행 정보보호시스템은 어플리케이션으로의 접근을 보호하는 기능을 갖는 형태로 하드웨어, 네트워크, 운영체제 등의 인프라를 보호하기 위한 시스템이 대부분이다. 본 논문은 사이버 공격에도 불구하고 어플리케이션이 서비스를 지속할 수 있는 침입감내시스템을 제안하고 설계 구현하였다. 제안 시스템은 어플리케이션의 기능과 침입감내 기능을 분리하고 다양한 보안 메커니즘을 통합하고 있는 미들웨어 기반의 시스템이다. 일상 생활에 많은 영향을 미치는 중요한 서비스인 경우에는 시스템의 기능 중 서비스의 지속성이 가장 중요하다. 제안한 침입감내 시스템은 향후 침입감내기능이 필요한 국방, 의료, 금융 시스템과 같은 사회기반시스템의 구축에 많은 부분이 활용될 것으로 생각한다.

• Annual Conference of KIPS
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• 2010.04a
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• pp.993-996
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• 2010

우리나라의 전자정부 서비스 대부분은 웹 환경을 기반으로 하고 있으며, 이는 국민생활의 질적인 향상을 가져온 반면 개인정보의 수집, 활용, 유통이 급격히 증가되면서 각종 프라이버시침해, 사이버 위협 등의 부작용이 수반되고 있으며 웹 브라우저의 다양화에 따른 웹접근성이 해결되어야 하고, 장애우 차별을 금지하기 위한 서비스가 동시에 제공되어야 한다. 따라서 웹서비스를 대상으로 하는 사이버 위협에 대한 보안대책과 다양한 서비스에 대한 대책이 중요한 요소로 부각되고 있다. 웹 환경에서의 보안문제를 해결하기 위해 기존에는 방어벽등 보안 모듈 부분을 강화하는데 초점을 맞추었으나, 본 논문에서는 그에 국한되지 않고 소프트웨어 개발초기 단계인 분석, 설계단계에서부터 보안문제를 고려하여 운영단계에 이르기까지 보안 취약점을 해결할 수 있는 방안을 제시하였다.