Fundamentals

PKI

• Verify a certificate chain using openssl verify - Stack Overflow (Recommended)
• What happens in a TLS handshake? | SSL handshake | Cloudflare (Recommended)
• How to use OpenSSL and the Internet PKI on Linux systems | Enable Sysadmin (redhat.com) (Heavily Technical Hands-on & Recommended)
• What Is Public Key Infrastructure (PKI) & How Does It Work? | Okta
• What is PKI? A Public Key Infrastructure Definitive Guide | Keyfactor
• The Difference Between Root Certificates and Intermediate Certificates (thesslstore.com)