실생활에서 권한의 위임을 통한 대리 서명은 일상적으로 널리 사용되고 있다. 이러한 대리 서명을 온라인 상에서 사용하기 위해서는 위임자의 권한 위임장이 위 변조와 오남용의 위험으로부터 안전하게 보호되어야 한다. 위임 인증서는 안전한 대리서명을 효과적으로 달성하기 위해 등장하였으며 현재 여러 가지 응용 서비스가 제안되고 있다. 위임 인증서는 대리 서명자가 대리 서명을 위한 키 쌍을 생성하고 이를 위임자의 이름과 묶어 서명을 한 인증서이다. 위임자는 이 인증서 내에 대리 서명자를 지정할 수 있으며 대리 서명자의 서명 권한을 제한할 수 있다. 본 논문은 이러한 위임 인증서를 이용하여 안전한 대리 서명을 지원할 수 있는 기술을 제안한다.
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