This paper raises an issue that the digital certificate can be represented in the form of XML. There are two fundamental issues of PKI must be solved： one is the interoperability, the other is trust evaluation criterion. XML works as an exchange format for normative data in network; not only can it simplify mutual operation, but also achieve the commutation of digital certificate by using the relational agreement of XML directly. Clients can take advantage of many automated tools to create and handle XML-based certificates. By using XML techno...
