Digital Certificates: How to Generate and Validate using Chain of Trust? скачать в хорошем качестве

Digital Certificates: How to Generate and Validate using Chain of Trust?

How Certificate Authorities Work — Step‑by‑Step TLS Certificate Chain of Trust In this lecture (University Network Security course) I walk you through how a Certificate Authority (CA) actually *generates* certificates, how those certificates are *signed* (root → intermediate → leaf), and how browsers verify a website certificate using the chain of trust. I also explain the differences between *Domain Validation (DV)**, **Organization Validation (OV)**, and **Extended Validation (EV)* and show real examples of verification checks. 🔔 WATCH NEXT: [Upcoming video: Certificate Expiration & Revocation — what to watch for] (link when ready) --- 00:00 — Intro & learning goals 00:18 — Key pair generation & CSR (Certificate Signing Request) explained 01:35 — Domain, Organization and Extended Validation 02:55 — How to generate a certificate? 04:45 — How a CA signs a certificate (root CA → intermediate CA → leaf cert) 05:35 — What happens when browser sends a request to website server? 06:10 — How browsers verify certificates step‑by‑step 07:58 — Chain of Trust Quiz (advanced — try after watching): 1) Explain how a browser validates a certificate chain if the server sends only the leaf certificate. 2) If an attacker obtains an intermediate CA private key, what can they do and how can the PKI ecosystem detect/mitigate it? 3) Why is the hashing algorithm field included in X.509 certificates, and what happens if algorithms change? --- Who this is for: • University students in Network Security / Cybersecurity • Developers & sysadmins who manage TLS certs & CAs • Anyone curious how the browser "lock" is actually verified If this video helped, please: • Like 👍 • Subscribe 🔔 • Share with classmates • Comment any questions — I read and reply to technical comments.