웹서비스의 느슨하게 결합된 특성은 그리드와 같은 이 기종 시스템들 간의 통신에 적합하다. OGSA는 그리드와 웹서비스를 결합한 새로운 구조로 XML, XACML, SAML 등의 기술을 주요 기술로 채택하고 있다. 특히, SAML이 경우 그리드 웹 포털들 간의 SSO 서비스를 제공하기 위한 목적으로 적극적으로 연구ㆍ도입되고 있다. 하지만, SAML을 이용하여 SSO 서비스를 제공하는 웹서비스에서 DoS 공격은 보안을 위협하는 결정적인 요소로 정상 트래픽을 사용하는 다수의 사용자에 서비스를 제공할 수 없는 문제를 가지게 된다. 이에, 본 논문에서는 공격자 역추적과 공격자 고립을 이용하여 SAML을 이용한 그리드 웹서비스의 DoS 취약성을 해결하고 다수의 이용자의 서비스를 보장하기 위한 방안을 제시한다.
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