| Summary: | 碩士 === 國立交通大學 === 資訊科學系 === 90 === With the fast development and increasing popularity of the XML, there was more and more documents will be present by XML. Every XML document is insecure because there was no access control on this document. And there was no access control standard for XML document, so we propose a security architecture to improve the XML document access control and enhance it’s performance by cryptography method.
In this thesis, we design a distributed system to improve XML document access control. When we want to control some document’s elements, we encrypt them by cryptography method, and we can security those elements. If client or users want to access those encrypted elements, they should decrypt it through the server called decryption server. And we can authorize user by this way when they want to access the element. For simplify the client program, we propose a library named agent. This agent will implement all protocol we will use, and this agent will enhance the flexibility and extensibility of our system.
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