인터넷의 급속한 발달과 더불어 네트워크 환경에서의 침입은 빠르게 증가하고 있으며, 그 피해 또한 급격히 증가하고 있다. 최근의 인터넷 공격은 특정 호스트나 네트워크에 대한 피해를 초래할 뿐만 아니라, 네트워크 전반의 성능 저하를 유발한다. 기존의 침입 탐지 시스템은 각 지역망 및 특정한 대상 시스템을 보호하기 위한 솔루션들로, 기간망 수준의 실시간 공격 탐지에 적용하기 힘든 문제점을 가지고 있다. 본 논문에서는 네트워크 수준의 실시간 공격탐지를 위하여 각 포트별 트래픽을 대상으로 지수평활법을 적용하는 광대역 네트워크 침입 탐지 기법 제안하였다. 8일간의 기간망의 트래픽 데이터를 대상으로 한 실험에서, 제안한 기법은 공격으로 추정되는 급격한 트래픽의 증가를 적절히 탐지함을 보여주었다.
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