본 논문에서는 비밀번호 인증만을 사용하는 시스템의 취약점을 보완한 다단계 사용자 인증 시스템을 구현하였다. 제안된 다단계 사용자 인증 시스템은 사용자의 아이디/비밀번호, 스마트카드 그리고 접근제어 정보 등의 4단계 인증이 사용된다. 본 논문에서 제시하는 사용자 인증 시스템은 FreeBSD 커널에 접근제어 기능을 추가한 SecuROS/FreeBSD를 바탕으로 개발되었다. 사용자에 따라 시스템에 접근할 수 있는 범위를 제한하는 기능과 중요 정보를 입력할 때 그 요정이 시스템에서 요청한 것임을 확인할 수 있는 기능을 기공하여 신뢰성을 높였다. SecuROS/FreeB 시스템에는 강제적인. 접근제어와 역할기반 접근제어가 사용되고 있어서 시스템에 접근하는 사용자는 접근하고자 하는 접근제어 정책에 대한 정보도 인증에 사용된다. 이때, 사용자가 요청한 접근제어 정보가 시스템에 정의된 접근제어 규칙에 모두 만족하는 경우에만 시스템 접근이 허가된다.
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