The PKI is a bundle of technologies, policies, and processes that facilitate the deployment of public-key cryptography in a network. The main purpose of a PKI is to ensure that all communication that takes place over a network (between a server and a client) is private and encrypted. It provides a framework for the implementation of data security techniques like encryption and digital signatures, and employs digital certificates to check the validity of various network endpoints. A digital certificate binds the public key to the entity it’s destined for, like a website or a service, and is a proof of an entity’s authenticity.
PKIs foster a highly secure environment for network communication activities like emails, online financial transactions, and critical database operations. They enhance data security and integrity by enforcing symmetric cryptography for data in transit and certificate-based asymmetric cryptography for endpoint authentication.