Public Key Infrastructure (PKI) is essential for enabling secure communication and verifying digital identities. This episode breaks down how PKI works, including the roles of certificate authorities (CAs), registration authorities (RAs), and digital certificates. You’ll learn about certificate chaining, revocation, validation protocols like OCSP and CRL, and how trust is established in both hierarchical and web-of-trust models. From SSL/TLS to code signing and user authentication, PKI is everywhere—and CISSPs need to know how to deploy and troubleshoot it securely.