This paper presents the proﬁles related to public-key Infrastructure (PKI) for the Internet. The PKI manages public keys automatically through the use of public-key certiﬁcates. It provides a basis for accommodating interoperation between PKI entities. A large-scale PKI issues, revokes and manages digital signature public-key certiﬁcates to allow distant parties to reliably authenticate each other. A sound digital signature PKI should provide the basic foundation needed for issuing any kind of public-key certiﬁcate.
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