Certificate authority (CA) is a required PKI subsystem, responsible for issuing, Renew, revoke and publish certificates and compile and Publish a certificate revocation list (CRLs). Certificate authority can be configured as a self-signed certificate Authorization, it is the root CA, can also act as a subordinate CA, It obtains its own signed certificate from a public CA.
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The PKI Server software Package contains the libraries and utilities required by the PKI Server.