The trend of rapid growing use of XML format in data/document management system reveals that securitymeasures should be urgently considered into next generation’s data/document systems. This paper presents a new certificatemanagement system developed on the basis of XML security mechanisms. The system is supported by the theories ofXML security as well as Object oriented technology and database. Finally it has been successfully implemented in usingC#, SQL, XML signature and XML encryption. An implementation metrics is evidently presented.
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