PKI is an acronym for Public Key Infrastructure which is a system of digital certificates, encryption protocols, and authentication measures that ensure the secure exchange of data over networks.

PKI enables organizations to securely identify users and devices as well as ensure the confidentiality and integrity of data sent over any network.

It is used in many industries such as healthcare, finance, government agencies, e-commerce sites, online banking services etc., for providing security to their confidential information.

The primary components of PKI include public key cryptography which uses two keys – one private key known only by its owner while another public key shared with anyone who needs it; digital certificates which are issued by Certificate Authorities (CAs); certificate revocation lists; trust models that determine how different entities interact with each other; directory services like LDAP or Active Directory for managing identities within an organization’s network; cryptographic algorithms like RSA or ECC for encrypting/decrypting messages between two parties etc.

In conclusion, PKIs provide strong authentication mechanisms through various means such as passwords , tokens , biometrics etc.

They also enable secure communication protocols among multiple parties across networks. The use cases are vast ranging from protecting sensitive customer information in e-commerce websites to ensuring patient privacy during medical records transfers.

Thus we can conclude that Public Key Infrastructure provides a robust security framework needed today’s technology driven world.

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