• Journal of Information Technology and Architecture
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• v.10 no.4
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• pp.451-466
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• 2013

기업들은 정보기술 리스크(IT Risk)에 대하여 어떻게 대처하고 있을까? 금융기관이나 공공기관은 태생적으로 이미 위험관리를 적극적으로 수행하고 있다. 정보기술에 대한 위험관리도 지난 10년동안 전산망 마비, 해킹 사고, 디도스 공격, 고객정보 유출 등을 겪으면서 적극적으로 대응해 왔다. 특히 2011년 농협사태는 IT 성과보다는 IT 보안을 훨씬 중요하게 보는 계기가 되었다. IT 보안 인력과 예산이 대폭 강화되고 망분리 사업이 추진되는 것이 대표적인 사례이다. 하지만 그동안 IT 위험관리는 특정 기술에 대한 사전 대응 및 사후 대응 강화에 집중되었다. 현재 IT 위험관리는 단편적 관리에서 종합적 관리로 전환되고 있다. 최근에 많은 기업들이 전사 차원의 정보기술 리스크 거버넌스(IT Risk Governance) 체계를 구축하고 있거나 구축하는 계획을 갖고 있다. 하지만 아직도 IT보안은 전사적으로 통합되지 못하였으며, IT 위험관리 프로세스는 조직에 내재화 되지 못 하였고, IT 성과관리와 연계성은 고려하지 못하고 있다. 본 논문에서는 IT 관리와 기술을 효과적으로 연계하기 위하여, 그리고 IT 성과와 IT 위험을 균형되게 관리하기 위하여 엔터프라이즈아키텍처(EA: Enterprise Architecture) 활용을 제안하고자 한다.

• Review of KIISC
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• v.15 no.2
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• pp.74-82
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• 2005

오늘날 네트워크 보안 기술은 해커의 침입 탐지 및 제어, 분산 서비스 거부 공격의 방지 등 많은 분야에서 발전하여 왔다. 그러나, 최근 많은 문제를 발생시키면서 등장한 인터넷 웜은 기존의 네트워크 보안 장비들을 무력화시키며 인터넷 상에 연결된 많은 호스트들을 감염시키고 동시에 네트워크 자원을 소모시켜 버렸다. 실상 초기의 웜은 작은 규모의 네트워크에서 퍼지는 정도 일뿐 심각한 피해를 주는 경우는 거의 없었고 따라서 이에 대해서 심각한 대비책 등을 생각하지는 않았다. 그러나 2001년 발생한 CodeRed 웜은 인터넷에 연결된 많은 컴퓨터들을 순식간에 감염시켜 많은 경제적, 물질적 피해를 발생시켰고, 그 이후 2003년 1월에 발생한 Stammer 웜은 10분이라는 짧은 순간 안에 75000 여대 이상의 호스트를 감염시키고 네트워크 자체를 마비시켰다. 특히 Stammer 월은 국내에서 많은 피해를 유발시켰기에 더더욱 유명하다. 명절 구정과 맞물려 호황을 누리던 인터넷 쇼핑 몰과, 인터넷 금융 거래를 수행하던 은행 전산소 등을 일시에 마비시켜 버리면서 경제적으로도 실질적인 막대한 피해를 우리에게 주었다. 이런 웜을 막기 위해서 많은 보안 업체 및 연구소들이 나서고 있으나, 아직은 사전에 웜의 피해를 막을만한 확실한 대답을 얻지 못하고 있다. 본 논문에서는, 현재 수행하고 있는 여러 웜의 탐지기법에 대해서 조사한 결과를 설명하고, 이어서 본 연구소에서 수행하고 있는 웜의 탐지 기법에 대해서 설명하고 간단한 탐지 결과를 보일 것이다.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.29 no.2
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• pp.439-449
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• 2019

The development of information technology represented by ICBMA (IoT, Cloud, Big Data, Mobile, AI), is leading to a surge in data and a numerical and quantitative increase in data centers to accommodate it. As the data center is recognized as a social infrastructure, It is very important to identify physical security threats in advance in order to secure safety, such as responding to a terrorist attack. In this paper, we develop physical security threat breakdown structure (PS-TBS) for easy identification and classification of threats, and verify the feasibility and effectiveness of the PS-TBS through expert questionnaires. In addition, we intend to contribute to the improvement of physical security level by practical use in detailed definition on items of PS-TBS.

• Convergence Security Journal
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• v.17 no.5
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• pp.71-76
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• 2017

Today, it is an information society where a large number of users access and view important data in a large number of information assets as needed. In this complexity, techniques related Identify Management are being applied, in order to verify authorized user access to important information assets and manage of history. But, the ability access to sensitive information using account has the disadvantage of being able to open the way for information to the attacker when it is hijacked. Thus, in this paper, we propose a secure Identify Management System that can control the use of accounts based on the attitude of the account holder, but also enhances the security and does not hinder the convenience.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.14 no.5
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• pp.23-36
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• 2004

This paper presents a password based authentication and key exchange protocol which can be used for both authenticating users and exchanging session keys for a subsequent secure communication over an untrusted network. Our idea is to increase a randomness of the password verification data, i.e., we split the password, and then amplify the split passwords in the high entropy-structured password verification data. And in order to prevent the verifier-compromised attack, we construct our system such that the password verification data is encrypted with the verifier's key and the private key of verifier used to encrypt it is stored in a secure place like a smart cards. Also we propose the distributed password authentication scheme utilizing many authentication servers in order to prevent the server-compromised attack occurred when only one server is used. Furthermore, the security analysis on the proposed protocol has been presented as a conclusion.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.11 no.5
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• pp.97-104
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• 2001

In this paper, we propose Recoverable Password Based Key Exchange Protocol(RPKEP). RPKEP has user who has password, server which share the secret key information with user, and password recovery agency(PRA) which help to recover the user\`s password. Proposed protocol has some advantages that it is secure against off-line dictionary attack which is considered most important in password based key exchange protocol and suer\`s security is preserved even though user\`s secret information stored in the server is disclosed. By applying Chaum\`s blind signature scheme in the process of password recovery, even the PRA can\`t obtain any information about user\`s password.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.16 no.6
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• pp.43-54
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• 2016

The occurrence of cyber crime is on the rise every year, and the security control center, which should play a crucial role in monitoring and early response against the cyber attacks targeting various information systems, its importance has increased accordingly. Every endeavors to prevent cyber attacks is being attempted by information security personnel of government and financial sector's security control center, threat response Center, cyber terror response center, Cert Team, SOC(Security Operator Center) and else. The ordinary method to monitor cyber attacks consists of utilizing the security system or the network security device. It is anticipated, however, to be insufficient since this is simply one dimensional way of monitoring them based on signatures. There has been considerable improvement of the security control system and researchers also have conducted a number of studies on monitoring methods to prevent threats to security. In accordance with the environment changes from ESM to SIEM, the security control system is able to be provided with more input data as well as generate the correlation analysis which integrates the processed data, by extraction and parsing, into the potential scenarios of attack or threat. This article shows case studies how to detect the threat to security in effective ways, from the initial phase of the security control system to current SIEM circumstances. Furthermore, scenarios based security control systems rather than simple monitoring is introduced, and finally methods of producing the correlation analysis and its verification methods are presented. It is expected that this result contributes to the development of cyber attack monitoring system in other security centers.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.25 no.5
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• pp.1043-1057
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• 2015

In order to recognize intelligent threats quickly and detect and respond to them actively, major public bodies and private institutions operate and administer an Intrusion Detection Systems (IDS), which plays a very important role in finding and detecting attacks. However, most IDS alerts have a problem that they generate false positives. In addition, in order to detect unknown malicious codes and recognize and respond to their threats in advance, APT response solutions or actions based systems are introduced and operated. These execute malicious codes directly using virtual technology and detect abnormal activities in virtual environments or unknown attacks with other methods. However, these, too, have weaknesses such as the avoidance of the virtual environments, the problem of performance about total inspection of traffic and errors in policy. Accordingly, for the effective detection of intrusion, it is very important to enhance security monitoring, consequentially. This study discusses a plan for the reduction of false positives as a plan for the enhancement of security monitoring. As a result of an experiment based on the empirical data of G, rules were drawn in three types and 11 kinds. As a result of a test following these rules, it was verified that the overall detection rate decreased by 30% to 50%, and the performance was improved by over 30%.

• The Journal of the Korea Contents Association
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• v.20 no.7
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• pp.618-628
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• 2020

The purpose of this paper is to propose a new security orchestration service model by combining various security solutions that have been introduced and operated individually as a basis for cyber security framework. At present, in order to respond to various and intelligent cyber attacks, various single security devices and SIEM and AI solutions that integrate and manage them have been built. In addition, a cyber security framework and a security control center were opened for systematic prevention and response. However, due to the document-oriented cybersecurity framework and limited security personnel, the reality is that it is difficult to escape from the control form of fragmentary infringement response of important detection events of TMS / IPS. To improve these problems, based on the model of this paper, select the targets to be protected through work characteristics and vulnerable asset identification, and then collect logs with SIEM. Based on asset information, we established proactive methods and three detection strategies through threat information. AI and SIEM are used to quickly determine whether an attack has occurred, and an automatic blocking function is linked to the firewall and IPS. In addition, through the automatic learning of TMS / IPS detection events through machine learning supervised learning, we improved the efficiency of control work and established a threat hunting work system centered on big data analysis through machine learning unsupervised learning results.

• Korean Security Journal
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• no.49
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• pp.187-214
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• 2016

In the mordern society, the reliance on the cyber domain and the cyber connectivity has been increasingly strengthened. Due to this phenomenon, the cyberterror against critical infrastructures and state organs might lead to fatal consequences. Lately, North Korea's cyberattacks against South Korea's national organizations and financial computer networks are becoming more and more intelligent and sophisticated. The cyberattacks against such critical infrastructures have caused enormous economic loss and social disorder. This paper is designed to examine comparatively the cyberterror related laws and organizations of the advanced countries such as U.S. and U.K. and to draw implications. Although those countries are under different institutional and cultural backgrounds with varying security envrionments, they are identically pursuing measures by establishing government-wide counterterror system for coordination and cooperation. They are also commonly focusing upon creating new organizations equipped with new system and upon enhancing intelligence performance and devising punishment regulations. Korea is lack of framework laws regulating cyber security, having only scattered individual laws. Since such legal base is far from efficient counterterror activities, it is necessary that the legal and policy response of the advanced countries should be closely studied for selective introduction. That will eventually lead to legislation of cyber security law. With such legislation on hand, it is subsequently required to strengthen crisis management for prevention of cyberterror and to create joint response team, cooperating with private organizations.