• Proceedings of the Korea Information Processing Society Conference
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• 2017.04a
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• pp.370-372
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• 2017

사이버 위협이 고도화, 지능화되면서 사이버보안 사고로 비롯한 유무형 손실이 점차 증가추세에 있으며, 이러한 피해를 최소화 하기 위해 사이버보안에 대한 필요성이 증대되고 있다. 기업에서는 각종 규제와 법률에 근거하여, 또는 신뢰할 수 있는 서비스를 고객에게 제공하기 위해서 보안 솔루션, 보안 서비스, 보안 컨설팅 등 다양한 방면에서 보안에 대한 투자를 늘리고 있다. 기업의 보안에 대해 투자는 비용과 효과를 분석하여야 효율적이고 효율적인 투자일 것이나, 아직은 이에 적합한 방안이 제시되지 않고 있다. 따라서 본 연구는 사이버보안 환경에 적합한 비용/효과 분석 방안으로 CMU SQUARE 팀의 비용효과분석 프레임워크를 선택하였고, SQUARE의 프레임워크를 기반으로 사이버보안 투자에 적합한 비용/효과 측정 방안을 제시하였다. 특히 기존의 금전적 효과에만 치중되어 연구가 부족했던 정성적 효과를 고려하여, 사이버보안 투자에서 발생되는 효과를 종합적으로 측정할 수 있도록 한다. 본 연구의 결과는 사이버보안과 관련된 투자의 비용/효과를 산출함으로써 기업의 보안 투자 방안 추진의 기준이 될 것이다.

• Journal of Internet Computing and Services
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• v.15 no.3
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• pp.91-100
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• 2014

While IT security investment of organizations has been increased, the amount of the monetary loss of organizations caused by IT security breaches did not decrease as much as their expectation. Also, from surveys, it was discovered that the poor usage of their security budget thwarted the improvement of the organization's security level. In this paper, to resolve the poor usage of security budget of organizations, we propose a comprehensive economic model for determining the optimal amount of investment in security solutions, including the proactive security solutions(PSSs) and the reactive security solutions(RSSs). Using the proposed analytical model under different parameters of security solutions, we show the optimal condition to maximize the expected net benefits from IT security investment of organizations. Also, we verify the common belief that the optimal level of investment in security solutions is an increasing function of vulnerability. Through simulations, we find the optimal level of IT security investment, given parameters of different characteristics of security solutions.

• Convergence Security Journal
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• v.9 no.1
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• pp.39-44
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• 2009

To get legitimacy of a security investment, the analysis of ROI about the security investment is required. In this paper, we suggest a practical quantitative model with considering factors that do decision-making of optimized security investment difficult. This model makes use of the value of a residual risk to decide the best information security solution and considers a corelation of response techniques of the information security solution against each threat to do exact decision-making.

• Proceedings of the Korean Information Science Society Conference
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• 2007.06d
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• pp.80-83
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• 2007

최근 들어 보안에 대한 피해의 급증으로 많은 기업들이 정보시스템에 막대한 기업 자원을 투입하고 있다. 뿐만 아니라, 다양한 ROI 평가 방법을 통해 투자대비 최대 수익률을 이끌어 내기 위해 끊임없이 시도하고 있다. 이는 많은 기업들이 정보시스템에 대한 투자를 유보하거나 정확한 평가 및 방법을 내리고 싶어한다는 증거이다. 이러한 기업의 추세는 최근 보안 분야에 있어 합리적인 보안 투자 방침을 세우는데 좋은 지침이 되어 지고 있다. 그러나. 지금의 대규모 정보 시스템 구축 및 웹기반의 인프라 환경에서는 적절한 보안 투자를 한다는 것은 쉽지 않다. 이러한 근본적인 이유 중 하나는 수익률을 측정하는 방법의 부재에서 찾을 수 있다. 따라서, 본 논문에서는 보안 분야에서 쓰이는 기존의 ROSI(Return On Security Investment)모델을 소개하고, 투자의 위험부담을 줄이기 위한 확률 기반의 개선된 ROSI(Probability based ROSI = PROSI) 방법론을 제안하고자 한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2012.11a
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• pp.857-860
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• 2012

본 논문은 금융투자업계에 대한 보안관제 정책을 기준으로 업계가 공동이용 가능한 통합보안관제시스템이 구축 가능하도록 금융투자회사들이 구축 운용하고 있는 보안인프라를 비롯한 전산망의 보안관제를 위한 적용 기술과 운용체계 등을 조사하고, 이를 토대로 외부로부터 공격에 대비한 모니터링, 침입탐지 및 실시간 방어 등의 기능이 적절하게 수행되고 업계 차원의 종합적이고 체계적인 관리가 가능한 통합보안관제시스템 모델과 운영방안을 제시하고자 한다.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.28 no.1
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• pp.269-281
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• 2018

Many organizations are threatened by numerous information security attacks which are resulting in information security incidents. To prevent information security incidents, organizations invest on various information security measures like information security products, monitoring services and security training and educations. However they do not have enough knowledge about measurable utilities of information security investments. Since there is little studies empirically examining the effect of information security investments, this research aims to find out utilities of information security investment. We especially focuse on information security service investments. This study examined the data from the survey on information security for business sector which was conducted by Korean information & security agency. We utilized negative binomial regression model, which is a suitable model for over-dispersed count data. We found out that an investment on information security education and vulnerability testing have direct impact on reducing information security incidents. This research academically contributed to shed light on the utility of information security investments on reducing information security incidents. This research practically contributed to providing information security investment guideline for organizations which want to reduce information security incidents efficiently.

• Proceedings of the Korea Information Processing Society Conference
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• 2008.11a
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• pp.574-577
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• 2008

실제 소프트웨어 개발에서 지속적으로 보안관련 문제들이 발생하고 있으므로 이를 해결하기 위하여 소프트웨어 개발 주기의 초기 단계인 요구사항 분석단계에서 보안 요구사항을 추출하는 것이 필요하다. 이는 요구사항 분석 단계에 대한 투자가 소프트웨어 개발의 성공률을 높일 수 있기 때문이다. 보안 요구사항을 추출하는 기법에 대해서는 여러 방면으로 연구가 시작되었으나, 보안 요구사항을 토대로 향후 소프트웨어 개발과정에서의 보안관련 위험도를 산정하여 보안 투자의 우선순위를 정하는 기법은 아직 연구되어 있지 않다. 그러므로 본 논문에서는 추출된 보안 요구사항을 가지고 소프트웨어 보안에 대한 위험도를 산정하여 투자 비용의 우선순위를 산정하는 절차에 대해 제안한다.

• Convergence Security Journal
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• v.15 no.3_2
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• pp.83-93
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• 2015

In this research, we used KOSPI, KOSDAQ and a stock price of Information Security related Company - S1, Ahnlab, Suprema, Raonscure and Igloosecurity. From August 2010 to July 2014, that is during 208 weeks(4 years), we had grasped index and stock price trend. Also we had attempted various Empirical analysis - Basic statistics of Security related Stock, Analysis of variance, Correlation analysis and Weekly Rate of Rise trends. The first purpose of this research is to see correlation between Security related Company and KOSPI, KOSDAQ. The second purpose of this research is to analyze whether stock items have investment value or not while watching features of flow of stock price per item. We expect possibility and merit of investment when we suppose Security industry's high potential to grow. It seems that Security related Company deserves to be invested. We expect investment for Security related Company that has high possibility of growing will create high yields compared to Market yields.

• Information Systems Review
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• v.9 no.1
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• pp.105-120
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• 2007

With the fast development of the Internet and the increasing dependence on information infrastructures, companies are faced with various information security threats such as information leakages, modifications, and information breaches. South Korea is one of the leading countries in the Internet usage, but is ranked relatively low when it comes to information security. In fact, many Korean firms have suffered financial losses and damaged corporate images from the information security breaches. However, because of the difficulties in quantifying the costs of the information security breaches, Korean companies tend to delay their investment decisions on information security. The purpose of this study is to measure the cost of information security breach and the economic value of security investment using the event study methodology. Our results show that the announcement of an information security breach negatively influenced the market value of the corresponding company. The effect was statistically significant at the significance level of p=0.05. The breached companies lose, on average, 0.86% of their market values on the day of the announcement - an average loss in market capitalization of $55 million. On the other hand, the investment on information security had no effect on the stock price or the market value of the firm.

• Information Systems Review
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• v.25 no.4
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• pp.27-45
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• 2023

The importance of information security has grown alongside the development of information and communication technology. However, companies struggle to select suitable countermeasures within their limited budgets. Sönmez and Kılıç (2021) proposed a model using AHP and mixed integer programming to determine the optimal investment combination for mitigating information security breaches. However, their model had limitations: 1) a lack of objective measurement for countermeasure efficacy against security threats, 2) unrealistic scenarios where risk reduction surpassed pre-investment levels, and 3) cost duplication when using a single countermeasure for multiple threats. This paper enhances the model by objectively quantifying countermeasure efficacy using the beta probability distribution. It also resolves unrealistic scenarios and the issue of duplicating investments for a single countermeasure. An empirical analysis was conducted on domestic SMEs to determine investment budgets and risk levels. The improved model outperformed Sönmez and Kılıç's (2021) optimization model. By employing the proposed effectiveness measurement approach, difficulty to evaluate countermeasures can be quantified. Utilizing the improved optimization model allows for deriving an optimal investment portfolio for each countermeasure within a fixed budget, considering information security costs, quantities, and effectiveness. This aids in securing the information security budget and effectively addressing information security threats.