12. Public Key Infrastructure (PKI), TLS 1.3 Handshake & Let's Encrypt Automation • Git, System Design & Web Security (OWASP Top 10) • Rishabh Ki Kaksha

Git, System Design & Web Security (OWASP Top 10) › 12. Public Key Infrastructure (PKI), TLS 1.3 Handshake & Let's Encrypt Automation

45 mins

← Prev Next →

Course Syllabus

Module 1: Git Internals, Plumbing Commands & DAG Graph Architecture

01. Git Internals: Blobs, Trees, Commits & Annotated Tags (The .git Directory Anatomy) 02. Git DAG (Directed Acyclic Graph) & Plumbing Commands (cat-file, hash-object, write-tree) 03. Git Three Trees Architecture: Working Directory, Staging Index & HEAD

Part 1: Git Mastery, Security Defense & Caching

Module 2: Advanced Branching Strategies & Disaster Recovery

04. Advanced Rebasing: Interactive Rebase (squash, edit, fixup) vs Merge 05. Git Disaster Recovery: git reflog, Cherry-Pick & Recovering Deleted Commits/Branches 06. Enterprise Branching: Trunk-Based Development vs GitFlow vs Feature Flag Architecture

Module 3: Web Application Security: OWASP Top 10 Defenses

07. OWASP #1 & #3: SQL Injection (SQLi) & Server-Side Request Forgery (SSRF) Hardening 08. Cross-Site Scripting (XSS): Stored, Reflected, DOM-based & Content Security Policy (CSP) 09. CSRF vs Cross-Origin Traps: SameSite Cookies, Anti-CSRF Tokens & CORS Preflight Rules 10. Broken Object-Level Authorization (BOLA/IDOR) & Role-Based Access Control (RBAC/ABAC)

Module 4: Cryptography, PKI, SSL/TLS & Mutual Auth (mTLS)

11. Asymmetric Cryptography (RSA vs ECC) & Digital Signatures with GPG Keys 12. Public Key Infrastructure (PKI), TLS 1.3 Handshake & Let's Encrypt Automation 13. Mutual TLS (mTLS) for Zero-Trust Service-to-Service Communication

Module 5: DevSecOps, Secret Scanning & Zero-Trust Security Architecture

14. Automated Secret Scanning (Gitleaks, Trufflehog) & Git Pre-Commit Hooks 15. Software Supply Chain Security: Dependabot, SBOM (Software Bill of Materials) & Signed Commits 16. Enterprise Zero-Trust Architecture: Cloud IAM, Bastion Hosts & WireGuard VPN Networks

Interactive Lesson Studio

# 12. Public Key Infrastructure (PKI), TLS 1.3 Handshake & Let's Encrypt Automation

> Git & Web Security Notes by Rishabh - Topic 12

---

### 1. The PKI Chain of Trust 📜

Kaise pata chale ki `google.com` ki public key sach me Google ki hai na ki hacker ki?
$$\text{Root CA (DigiCert)} \longrightarrow \text{Intermediate CA} \longrightarrow \text{Domain SSL Certificate}$$
*Browser pre-installed Root CA certificates se cryptographic signature chain verify karta hai.*

---

### 2. TLS 1.3 Handshake (The 1-RTT Speed Upgrade ⚡)

*   **TLS 1.2:** 2 Roundtrips (2-RTT) negotiation latency.
*   **TLS 1.3:** Sirf **1 Roundtrip (1-RTT)** negotiation! Client `ClientHello` ke sath hi Supported Key Shares bhej deta hai.
*   **0-RTT Resumption:** Returning visitors ke liye zero-latency instant encrypted communication.

---

### 3. Automated SSL with Let's Encrypt & Certbot ACME Protocol

```bash
# Automated Certbot Nginx SSL generator:
certbot --nginx -d rishabhkikaksha.boostengine.in --non-interactive --agree-tos -m admin@boostengine.in
```

---

### 4. Master Comparison Matrix

---

### 5. Interview Ke 3 Sawal Is Topic Se

1. **Forward Secrecy (PFS - Perfect Forward Secrecy) kya hoti hai?** -> Agar future me server ki private key compromise ho jaye, tab bhi attacker purane recorded network traffic ko decrypt nahi kar sakta kyunki har session ki ephemeral key alag hoti hai.
2. **ACME (Automated Certificate Management Environment) protocol domain validation kaise karta hai?** -> HTTP-01 challenge (`.well-known/acme-challenge/token`) ya DNS-01 TXT record challenge verify karke.
3. **OCSP Stapling web server performance me kaise help karta hai?** -> Web server SSL certificate revocation status ko CA se pre-fetch karke TLS handshake me attach kar deta hai jisse browser ko alag se CA server query nahi karna padta.

---
**Next Topic:** 13. Mutual TLS (mTLS) for Zero-Trust Service-to-Service Communication

Loading lesson content...

Python 3.12

Full IDE

Live Execution Terminal

Click "Execute Live" to run code.
                

Lesson Mastery AI Quiz

AI Doubt Solver

CERTIFICATE OF COMPLETION

Rishabh Gehlot

PHP 8+ & Laravel 11 Master Track