Implementing X.509 based public-key infrastructure requires following a complex set of rules to establish if a public key certificate is valid. The XML Key Management Specification has been developed as one way in which the implementation burden can be reduced by moving some of this complexity from clients and onto a server. In this paper we give a brief overview of the XML key management specification standard, and describe how, in addition to the above, this system also provides us with the means to sensibly break many of the rules specified for X.509 based public key infrastructure.
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