What is meant by Public Key Infrastructure (PKI)?

PKI refers to a collective ecosystem of roles, responsibilities, policies, and procedures for issuing, managing, and revoking digital certificates. The PKI ecosystem ensures the secure and private exchange of sensitive electronic information between known and unknown parties over untrusted networks.

An classical example of PKI is the management of X.509 digital certificates for HTTPS web services, offered by banks and other retailers to protect customers on the internet.

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