특정 도메인에서의 공격 그래프 적용 가능성에 대한 타당성 분석
Feasibility Analysis on the Attack Graph Applicability in Selected Domains
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본 논문에서는 Enterprise 네트워크 이외 환경에서의 공격 그래프 연구 중 최근 5년간 가장 많이연구된 사이버-물리 시스템(CPS) 환경에 대한 공격 그래프 연구 동향을 살펴보고, 기존 연구의 한계와 앞으로 나아갈 방향을 분석한다. 최근 5년간 발표된 공격 그래프 논문 150여 편 중 35편이CPS 환경을 대상으로 하고 있으며, 본 논문에서는 CPS 환경의 보안 측면 특징을 살펴보고, 대상연구들을 이러한 특징들에 따라 물리 시스템 모델링 여부와 네트워크 단절 구간에 대한 고려 여부의 두 가지 관점으로 분류 및 분석한다. 본 논문에서 소개한 20편의 논문 중 절반이 CPS 환경의 특징을 제대로 반영하지 못하며, 나머지 절반의 연구가 물리 시스템 모델링과 네트워크 단절구간 중 하나씩을 다루고 있다. 본 논문에서는 이러한 상황을 바탕으로 CPS 환경에서의 공격 그래프 연구가 직면한 어려움을 진단하고 이에 따라 앞으로의 CPS 환경 공격 그래프 연구는 국가주도 연구, 공개된 상용 시스템을 대상으로 한 연구가 주를 이룰 것으로 분석한다.
Abstract
In this paper, a research trend of attack graph studies for Cyber-Physical System (CPS) environments is surveyed, and we analyse the limitations of previous works and prospect the future directions. 35 among around 150 attack graph studies conducted within 5 years target CPS, and we inspect key features of CPS environment in the security aspect. Also, we categorize and analyze target studies in the aspect of modelling physical systems and considering air gaps, which are derived as key features of the security aspects of CPS. Half of 20 research that we surveyed do not reflect those two features, and other studies only consider one of the two features. In this circumstance, we examine challenges that attack graph studies on CPS environment face. Finally, we expect state-led studies or studies targeting open-spec commercial CPS will dominate.
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