기존의 사이버 공격은 특정 호스트나 서버를 목표로 하여 정보의 탈취 및 변경 등에 집중되었으나, 현재는 직접 혹은 간접적으로 과다 트래픽을 유발하여 네트워크 서비스를 마비시키는 방향으로 그 경향이 변하고 있다. 이런 사이버 공격을 방지하여 네트워크의 안정적인 서비스의 제공을 위해서는 공격 징후나 이상 징후를 탐지하고 네트워크 차원에서 이에 대한 대응 방안을 결정하여 이를 네트워크 상에 강제할 수 있는 체계적인 보안 관리가 이루어져야 한다. 또한 네트워크 각 운용 주체별로 개별 보안 상황에 대해 적용할 보안 정책이 다르므로 이를 모델링하고 적용할 수 있는 방법이 제공되어야 한다. 본 논문에서는 정책 기반 네트워크 보안 관리 기능을 수행하기 위해 필요한 공격 및 이상 징후의 탐지, 그에 대한 대응과 이런 일련의 작업에 보안 정책을 강제하기 위한 보안 정책관련 연구 동향에 대해 다루도록 한다.
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