Public Key Infrastructure
The general approach to handling keys using trusted entities and digital certificates has been formalized into a strategy called the public key infrastructure (PKI). PKI is the collection of hardware, software, policies, and procedures needed to manage digital certificates. The PKI process starts with a list of trusted entities and their public keys. A trusted entity is generally a certificate authority (CA) or a defined trusted source. Each computer system contains a list of public keys of trusted entities. A document that is encrypted with a trusted entity’s private key can be decrypted with the same entity’s public key.
When setting up a connection, you would first obtain a security certificate from a trusted entity. ...
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