The purpose of PKI system is to provide a way for users to reliably authenticate each other. This requires the users to have private-public keypairs (as described in Section 11.1.1.2, Asymmetric encryption), some sort of certificate to verify the users identity, and a system to manage and distribute keys and certificates. For verifying the identity of a user, either centralized PKI systems, or webs of trust can be used.
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