What are the core concepts covered in OAuth 2.0 (PKCE), Multi-Factor Auth & STRIDE Threat Modeling?

OAuth 2.0 Authorization Code Flow with PKCE (Proof Key for Code Exchange); Multi-Factor Authentication (TOTP / WebAuthn FIDO2 keys); The STRIDE Threat Modeling framework (Spoofing, Tampering, Repudiation, Info Disclosure, DoS, Elevation of Privilege)

Advanced 22 min readModule: Module 11: Authentication, OAuth 2.0 & Threat Modeling

OAuth 2.0 (PKCE), Multi-Factor Auth & STRIDE Threat Modeling

Implement delegated authorization with OAuth 2.0 + PKCE and systematically analyze architecture risks with STRIDE.

What You Will Learn in This Lesson

OAuth 2.0 Authorization Code Flow with PKCE (Proof Key for Code Exchange)
Multi-Factor Authentication (TOTP / WebAuthn FIDO2 keys)
The STRIDE Threat Modeling framework (Spoofing, Tampering, Repudiation, Info Disclosure, DoS, Elevation of Privilege)

Introduction & Core Concept

OAuth 2.0 is the industry-standard authorization framework enabling third-party applications to obtain limited access to user accounts without sharing passwords. STRIDE provides a structured method to find vulnerabilities during architectural design.

WHY DOES THIS MATTER IN THE REAL WORLD?

Threat modeling before writing code prevents fundamental architectural security flaws that cost millions to fix post-launch.

STRIDE Threat Modeling Taxonomy

text

1
2
3
4
5
6
S - Spoofing Identity (Prevent with MFA & Digital Signatures)
T - Tampering with Data (Prevent with Hashes & TLS)
R - Repudiation (Prevent with Audit Logs & WORM Storage)
I - Information Disclosure (Prevent with Encryption & Least Privilege)
D - Denial of Service (Prevent with Rate Limiting & Autoscaling)
E - Elevation of Privilege (Prevent with Role-Based Access Control RBAC)

Line-by-Line Technical Breakdown

1PKCE (RFC 7636) prevents authorization code interception attacks on single-page apps and mobile devices.

Try It Yourself (Interactive Editor)

Modify the code in real-time and click Run to test live browser output and console logs.

Intelligent Code Runner & Live Sandbox[TEXT]

TEXT SOURCE EDITOR

Interactive Live Code

>[TEXT Runtime Initialized]

>Program compiled and executed with 0 errors.

>Output generated successfully.

Industry Best Practices & Professional Standards

Perform STRIDE threat modeling on all new system architecture diagrams before implementation.

Lesson Summary & Core Takeaways

Threat modeling and modern OAuth standards build secure-by-design software systems.