• Review of KIISC
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• v.13 no.3
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• pp.31-37
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• 2003

전자정부 구현에 있어 온라인상에서 유통되는 각종 행정정보에 대한 정보보호는 필수적인 선결 조건이다. 미국 등 각국에서는 전자전부의 정보보호 기반 구축을 하여 가상행정을 환경에서 당사자의 신원 확인,기밀성,무결성,부인봉쇄 등을 보장하는 정부차원의 PKI(Public Key Infrastructure)를 구축.운영 중에 있다. 본 논문에서는 주요 정보의 비밀성, 무결성 등을 보장하는 정부차원의 정보보호체계 구축을 위해 2000년부터 추진되고 있는 GPKI(Govermment Public Key Infrastructure) 구축 현황, 인증서비스 현황 및 향후 방향에 대하여 논하였다.

• The KIPS Transactions:PartC
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• v.13C no.1 s.104
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• pp.113-120
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• 2006

A node of mobile IPv6 moving foreign networks needs authentication process to support right services against from security threat. AAA is a trust infrastructure that authenticates, authorizes, and accounts nodes receiving a network service. And Mobile IPv6 Working Group recommends use of AAA infrastructure to authenticate mobile nodes. Event though AAA infrastructure provides strong authentication functions, it should exchange a lot of messages to authenticate mobile nodes every movement. The exchange of lots of messages causes latency and it is interfered with realization of real-time communication. This paper proposes an authentication method of improved speed using hash value of mobile node to reduce authentication latency. Directly after movement, a mobile node applying a Proposed method uses extended existing security authentication for a while and deletes the establishment latency of new security authentication. Performance evaluation of a proposed method verifies the efficiency through the analysis of cost comparison with other methods. The conclusion of performance evaluation is that the proposed method gets more 25% performance improvement than a general method when a mobile node moves another subnet.

• International Journal of Computer Science & Network Security
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• v.22 no.10
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• pp.145-154
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• 2022

Based on the obtained results of the study, the most problematic issues and legal conflicts are identified, which are related to the ratio of norms of domestic and foreign legislation, taking into account the requirements of the Constitution of Ukraine and the provisions of the Law of Ukraine "On international agreements". Along with this, it is stated in this scientific article that there are a number of provisions and examples of positive practice on the specified topic abroad and in international legal acts today, which should be used by Ukraine both in improving legislation on the issues of banking activity and in increasing the level of criminal legal protection of relevant critical infrastructure facilities, especially those that are substantively related to prevention and counteraction of activity, with regard to the legalization (laundering) of criminally obtained funds, financing of terrorism and the financing of the proliferation of weapons of mass destruction, which is quite relevant for our state, given the military conflict that is taking place on its territory in the Donbass. Again, in the same context, the need for more active cooperation between Ukraine and the FATF (international body developing a policy to combat money laundering) has been proven.

• Proceedings of the Korea Information Processing Society Conference
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• 2019.10a
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• pp.491-494
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• 2019

The results from the analysis of recent security breach cases of industrial control systems revealed that most of them were caused by the employees of a partner company who had been managing the control system. For this reason, the majority of the current company security management systems have been developed focusing on their performances. Despite such effort, many hacking attempts against a major company, public institution or financial institution are still attempted by the partner company or outsourced employees. Thus, the institutions or organizations that manage Industrial Control Systems (ICSs) associated with major national infrastructures involving traffic, water resources, energy, etc. are putting emphasis on their security management as the role of those partners is increasingly becoming important as outsourcing security task has become a common practice. However, in reality, it is also a fact that this is the point where security is most vulnerable and various security management plans have been continuously studied and proposed. A system that enhances the security level of a partner company with a Virtual Desktop Infrastructure (VDI) has been developed in this study through research on the past performances of partner companies stationed at various types of industrial control infrastructures and its performance outcomes were statistically compiled to propose an appropriate model for the current ICSs by comparing vulnerabilities, measures taken and their results before and after adopting the VDI.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.21 no.4
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• pp.39-46
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• 2011

This study is conducted to examine the optimal integrated security policy based on network in case of attacks by implementing unique security policies of various network security equipments as an algorithm within one system. To this end, the policies conduct the experiment to implement the optimal security system through the process of mutually integrating the unique defense policy of Firewall, VPN(Virtual Private Network), IDS(Intrusion Detection System), and IPS(Intrusion Prevention System). In addition, this study is meaningful in that it designs integrated mechanism for rapid detection of system load caused by establishment of the security policy and rapid and efficient defense and secures basic network infrastructure implementation.

• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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• 2002.11a
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• pp.225-229
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• 2002

The electronic voting becomes new challenging area in cryptographic application. A variety of schemes are designed and implemented based on cryptographic protocols. Initiated by ICU, one of best practices was votopia[1] which was successfully served into the Internet voting based on modified Ohkubo et al.'s scheme[2] under Public Key Infrastructure (PKI) and Java technology. Votopia was used to select the Most Valuable Player and Best Goal Keepers of 2002 FIFA World Cup Korea/Japan$\^$TM/ through the Internet where most voters can access and cast their ballots from any place and at any time. However, votopia assumed that the resources of the Internet voters only connected via wired environment. In this paper, we suggest how to extend votopia to mobile voting which has limited computing resources.

• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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• 2001.11a
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• pp.318-321
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• 2001

We have designed an Internet voting system applicable for worldwide voting which is based on Ohkubo et. al,'s scheme[9] combined with Public Key Infrastructure (PKI). To the best of our knowledge, this is the first trial to serve secure Internet voting system to the world. In our system, voter's privacy is guaranteed by using blind signature and mix-net, and robustness is provided through the threshold encryption scheme. By employing Java technology, we propose a way of typical implementation for internet voting system. Furthermore, PKI permits worldwide key distribution and achieve “one certificate/one vote” policy. Therefore, anyone can participate in the voting if he gets a certificate from Certificate Authority (CA). By the joint work between Korean and Japanese teams, the implementation aims to select MVPs in 2002 FIFA World Cup Korea-Japan$\^$TM/ in easy and friendly manner for any Internet user to participate and enjoy Internet voting.

• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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• 2003.07a
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• pp.167-172
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• 2003

무선 단말기에서 인터넷 서비스를 제공하기 위한 인터넷 접속 프로토콜이 등장함에 따라 무선 인터넷 사용의 편리성과 특성에 대한 인식이 급속한 속도로 확산되고 있다. 무선 인터넷에서 전자상거래를 비롯한 데이터 서비스가 성공적으로 제공되기 위해서는 반드시 해결되어야 할 요소가 보안이다. 무선 인터넷의 안전한 전자상거래 서비스를 제공하기 위해서는 통신정보에 대한 기밀성, 개체인증 등의 정보보호를 위한 기능과 부인방지 기능 등을 제공해야 한다. 공개키 기반구조 (Public Key Infrastructure, PKI)는 사용자에게 정보보호기능과 부인방지 기능을 제공한다. 본 논문에서는 무선 인터넷 환경에 적용 가능한 공개키 기반구조 적용 모델을 제안한다.

• KIPS Transactions on Computer and Communication Systems
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• v.5 no.9
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• pp.269-274
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• 2016

In this paper We focuses on suggestion to quality model for IoT infrastructure services for Internet of Things. Quality model is suggested on security set out in ISO25000 quality factors and assessment of the existing traditional software application of ISO 9126 quality model. We validated that the proposed model can be realized it was applied to evaluate the 4 elements and related security in Metrics.

• International journal of advanced smart convergence
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• v.10 no.4
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• pp.22-29
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• 2021

For web application vulnerability diagnosis, from the development stage to the operation stage, it is possible to stably operate the web only when there is a policy that is commonly applied to each task through diagnosis of vulnerabilities, removal of vulnerabilities, and rapid recovery from web page damage. KISA presents 28 evaluation items for technical vulnerability analysis of major information and communication infrastructure. In this paper, we diagnose the vulnerabilities in the automobile goods shopping mall website and suggest security measures according to the vulnerabilities. As a result of diagnosing 28 items, major vulnerabilities were found in three items: cross-site scripting, cross-site request tampering, and insufficient session expiration. Cookie values were exposed on the bulletin board, and personal information was exposed in the parameter values related to passwords when personal information was edited. Also, since the session end time is not set, it was confirmed that session reuse is always possible. By suggesting security measures according to these vulnerabilities, the discovered security threats were eliminated, and it was possible to prevent breaches in web applications and secure the stability of web services.