Abstract. In the past two or three years, most major Public Key Infrastructure(PKI) vendors have released products which allow users to roam from one machine to another without having to manually manage the export and import of their credentials such as private keys and corresponding certificates onto temporary media like diskettes. In this paper, we survey three popular key roaming products of Baltimore's, Entrust's and VeriSign's. We also propose key roaming system which improves VeriSign's roaming service and analyze its security.

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