Definition
Public key infrastructure PKI is a system of hardware software and policies that manages digital certificates and public key encryption. It establishes a trusted framework for verifying the identity of users and devices through digital signatures and encryption. PKI enables secure communication and data protection by issuing and managing digital certificates that bind public keys to specific entities. This infrastructure is crucial for establishing trust and ensuring the authenticity and integrity of digital transactions and communications. For instance, securing a website with an SSL TLS certificate relies on PKI to encrypt data between the browser and server. It is important to distinguish PKI from simply using encryption, as PKI provides the overarching management and trust framework. PKI concepts are fundamental to cybersecurity certifications like CompTIA Security+ and CISSP.