인터넷상에서 메시지 교환을 위하여 XML의 사용이 급증함에 따라 XML문서의 보안이 필요하게 되었고, 이에 W3C는 XML-Signature 표준안을 제안 하고 있다. XML-Signature 표준 스펙에서는 서명할 문서의 내용을 선택 하는 방법으로 Transform 알고리즘들을 제안하고 있고, 그 알고리즘들은 서명자가 원하는 문서의 일부분만을 선택하거나, 변형하는 방법들을 기술하고 있다. 서명 시스템은 그런 Transform 알고리즘을 사용하여 문서의 전체 흑은 원하는 부분만을 선택하여 서명 함으로써 서명의 생성 및 검증의 처리속도를 높일 수 있고, 송.수신 시 효율을 높일 수 있고, 기존의 문서를 재사용 할 수 있는 등의 장점을 제공 하고 있다. 본 논문에서는 위와 같은 처리를 할 수 있는 4가지 Transform 알고리즘(XPath, XSLT, Enveloped. Base64 Transform)과 XML문서들의 무결성을 유지하기 위해 W3C의 Canonical XML 스펙을 기반으로 하는 Canonicalization Transform 알고리즘을 설계, 구현하였다. 이 Transform 알고리즘들은 XML 디지틸 서명 뿐 만 아니라 문서를 선택적으로 변환하는 응용등에서 사용할 수 있다.
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