Master OAuth 2.0: A Practical Guide to API Security
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Master OAuth 2.0: A Practical Guide to API Security is your one-stop resource for designing, implementing, and managing secure API infrastructures. Whether you’re a seasoned developer or just starting out, this course offers a comprehensive, hands-on approach to understanding OAuth 2.0, OpenID Connect, token-based authentication, and more. Throughout the lessons, you’ll explore access tokens, refresh tokens, JWTs, SAML, and other cutting-edge security protocols to effectively secure your modern applications and services.
You’ll learn when and how to apply local token validation versus token introspection, how to choose between public and confidential clients, and how to define scalable OAuth scopes that fit your project’s exact requirements. With in-depth coverage of user-initiated flows—such as the Authorization Code Flow, Proof Key for Code Exchange (PKCE), and Implicit Flow—you’ll gain a firm grasp on configuring these flows in real-world scenarios. We’ll also tackle advanced topics like mutual TLS (mTLS), advanced client authentication methods (including JWT and SAML assertions), FAPI-compliant token security mechanisms such as Demonstration of Proof of Possession (DPoP), and even PKI (Public Key Infrastructure) basics to support secure certificate-based solutions.
For machine-to-machine communication, you’ll master the Client Credentials Flow and learn how to integrate external identity providers or legacy systems without compromising performance or security.
You’ll walk through hands-on cURL simulations, attacker scenarios, and decision trees that make it easy to map OAuth best practices to your specific project environment. By understanding each chapter’s detailed agenda and applying core concepts step by step, you’ll build robust API security strategies that scale—whether you’re migrating a legacy system or launching a new zero-trust architecture.
Don’t let confusion about flows, configurations, or integrations hold you back. Enroll now and take the guesswork out of OAuth 2.0!
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1Course Agenda and StructureVideo lesson
Explore the detailed agenda of the course, including nine chapters packed with practical use cases, real-world scenarios, and advanced OAuth 2.0 mechanisms. Learn what to expect and how to tailor your learning experience.
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2Recommendations for Maximizing Your Learning ExperienceVideo lesson
Learn how to adapt the course to your needs with tips on playback speed, chapter selection, and prerequisites. Perfect for beginners, advanced learners, or those focusing on specific project requirements.
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3Introduction and Agenda for OAuth 2.0 BasicsVideo lesson
Discover the roadmap for mastering OAuth 2.0 in this chapter. We'll cover why OAuth2 is essential, its roles, flows, scopes, token validation, and even introduce OpenID Connect (OIDC). Get a sneak peek into live demos and practical scenarios to help you secure APIs effectively. Perfect for beginners and professionals diving into OAuth2 fundamentals.
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4Why OAuth 2.0 is Essential: A Practical StoryVideo lesson
Understand the need for OAuth 2.0 through an engaging story about Sam Snapster and his photo-sharing challenges. Learn how OAuth2 secures resources, eliminates password sharing, and provides granular access control. Explore how major platforms like Google and Facebook rely on OAuth2 to protect user data.
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5Understanding OAuth 2.0 Standard Flow Through a Real-World ScenarioVideo lesson
Learn the OAuth 2.0 standard flow through a relatable real-world story! Discover the roles of Resource Owners, Clients, Authorization Servers, and Resource Servers, and see how they collaborate to securely share resources. Map technical OAuth 2.0 processes to everyday scenarios, simplifying complex concepts into practical insights.
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6Understanding OAuth 2.0 RolesVideo lesson
Solidify your understanding of OAuth 2.0 by exploring its key roles: OAuth 2.0 Resource Owner, OAuth 2.0 Client, OAuth 2.0 Resource Server, and OAuth 2.0 Authorization Server. Learn how these OAuth 2.0 roles interact in real-world scenarios and technical OAuth 2.0 flows.
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7OAuth 2.0 Demo: Real-Life Application with Photopea and OneDriveVideo lesson
Explore the standard OAuth 2.0 flow in action! Learn how Photopea, OneDrive, and Microsoft’s Authorization Server collaborate to securely share resources. Watch a hands-on demo showing token generation, permissions review, and access revocation, bringing OAuth 2.0 concepts to life.
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8OAuth 2.0 Basics: Understanding Flows, Roles, and Real-World ScenariosQuiz
Assess your knowledge of OAuth 2.0! Dive into essential concepts, the roles of Resource Owners, Clients, Authorization Servers, and Resource Servers, and explore real-world applications for secure API access.
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9Understanding OAuth 2.0 Client Types: Public vs. Confidential ClientsVideo lesson
Discover the crucial differences between Public and Confidential Clients in OAuth 2.0. Learn how client types influence API security, configuration, and flow selection for modern applications.
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10OAuth 2.0 Scopes: Controlling API Access and Permissions (Part 1)Video lesson
Understand how OAuth 2.0 scopes define and control client access to API resources. Learn how scopes enhance security by limiting permissions to only what's necessary, aligning with the principle of least privilege.
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11OAuth 2.0 Scopes: Structuring and Naming for API Usability (Part 2)Video lesson
Learn best practices for structuring and naming OAuth 2.0 scopes to ensure secure and manageable API access. Discover techniques for aligning scopes with business needs, maintaining consistency, and avoiding scope explosion.
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12OAuth 2.0 Scopes: Deriving Effective Scope Strategies (Part 3)Video lesson
Learn various strategies for deriving OAuth 2.0 scopes, including business-aligned scopes, API-based structures, and role-based access control (RBAC). Explore how to balance audit compliance, security needs, and practical implementation for robust scope management.
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13Mastering OAuth2 Client Types and ScopesQuiz
Test your understanding of OAuth2 client types, their configurations, and how to effectively define and use OAuth2 scopes for secure API access control.
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14Understanding OAuth 2.0: Access Token vs. Refresh TokenVideo lesson
Discover the differences between OAuth 2.0 access tokens and refresh tokens. Learn how access tokens grant short-term resource access and how refresh tokens enable seamless token renewal for secure, long-lasting sessions.
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15OAuth 2.0 Token Formats Explained: Opaque vs. JWT (Part 1)Video lesson
Dive into the differences between opaque tokens and JSON Web Tokens (JWTs) in OAuth 2.0. Learn how each format handles security, validation, and data transmission for modern API authentication.
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16OAuth 2.0 Token Formats Recap: Opaque vs. JWT (Part 2)Video lesson
Summarize the differences between opaque and JWT tokens in OAuth 2.0. Explore structure, readability, introspection, self-validation, and how these formats impact API security and performance.
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17OAuth 2.0 Token Validation: Real-Time Introspection Explained (Part 1)Video lesson
Learn how to validate OAuth 2.0 tokens in real-time using token introspection. Explore its process, benefits, and best practices for secure API integration.
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18OAuth 2.0 Token Validation: JWT Local Token Verification (Part 2)Video lesson
Understand how to use JWT local validation for offline OAuth 2.0 token verification. Learn about symmetric and asymmetric signing methods for secure implementation.
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19OAuth 2.0 Token Validation: Choosing the Best Approach (Part 3)Video lesson
Compare token introspection and JWT local validation. Discover their strengths, limitations, and ideal use cases to select the right method for your projects.
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20Introduction to OpenID Connect (OIDC) and OAuth 2.0 ComparisonVideo lesson
In this lesson, we’ll introduce OpenID Connect (OIDC) and see how it builds on OAuth 2.0 to enable seamless user authentication and identity management. We’ll cover the core concepts of OIDC, compare it with OAuth 2.0, and highlight the additional features that OIDC brings to the table. By the end of this lesson, you’ll have a solid understanding of the difference between OAuth 2.0 and OpenID Connect, and how they work together to handle both authorization and authentication needs in modern applications.
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21OIDC in Action: Practical Flow and User AuthenticationVideo lesson
In this lesson, we’ll dive deeper into how OpenID Connect (OIDC) works by examining a practical flow. We’ll explore the OIDC flow that integrates OAuth 2.0, focusing on how identity information is retrieved from the authorization server. You'll see how OIDC adds the concept of ID tokens to OAuth 2.0's access tokens, enabling applications to authenticate users securely. With this knowledge, you'll be able to understand how authentication data is managed and used in real-world applications.
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22Real-World Use Case Demo: OIDC Authentication with PhotopeaVideo lesson
In this lesson, we’ll walk through a real-world scenario where OpenID Connect is used for user authentication. Using Photopea as a demonstration, we’ll authenticate a user through Microsoft’s OAuth 2.0 and OIDC integration, showing how OIDC facilitates secure user sign-in and profile information retrieval. By following this example, you’ll gain hands-on experience with the OIDC process and see how user data can be securely exchanged between applications using OAuth and OIDC.
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23Mastering OAuth2 Tokens, Validation, and OpenID ConnectQuiz
Test your knowledge of OAuth2 tokens, their formats, validation methods, and how OpenID Connect extends OAuth2 for identity management.
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24Agenda: OAuth 2.0 User-Initiated Flows OverviewVideo lesson
Discover the chapter's focus on OAuth 2.0 user-initiated flows, including Implicit, Authorization Code, and PKCE. Learn about their use cases, structure, and security highlights.
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25Understanding the OAuth 2.0 Implicit Flow: A Step-by-Step GuideVideo lesson
Explore the simplest OAuth 2.0 user-initiated flow—Implicit Flow. Learn its roles, key parameters, and how it handles browser-based apps for secure API authorization.
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26OAuth 2.0 Implicit Flow: Hacker Scenario and Security ChallengesVideo lesson
Review the OAuth 2.0 Implicit Flow with a detailed sequence diagram. Discover its security risks, such as token exposure, and why it's deprecated in OAuth 2.1.
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27Understanding the OAuth 2.0 Authorization Code Flow: A Step-by-Step GuideVideo lesson
Discover the OAuth 2.0 Authorization Code Flow with this detailed step-by-step guide. Learn how it enhances security for confidential clients in web and server-side applications.
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28OAuth 2.0 Authorization Code Flow: Hacker Scenarios and Security ChallengesVideo lesson
Recap the OAuth 2.0 Authorization Code Flow with a detailed sequence walkthrough. Explore how it addresses implicit flow vulnerabilities and the security challenges for public clients.
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29Understanding the OAuth 2.0 PKCE Flow: A Step-by-Step GuideVideo lesson
Learn how the OAuth 2.0 PKCE (Proof Key for Code Exchange) flow strengthens authorization security for public and confidential clients. Understand the code verifier, code challenge, and method.
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30OAuth 2.0 PKCE Flow: Hacker Scenarios and Security EnhancementsVideo lesson
Discover how the PKCE flow prevents attacks with code verifiers and challenges. Learn how it secures public and confidential clients against hackers, ensuring robust OAuth 2.0 authorization.
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31Recap of OAuth 2.0 User-Initiated Flows and Decision TreeVideo lesson
Summarize OAuth 2.0 user-initiated flows—Implicit, Authorization Code, and PKCE. Use a decision tree to align flow selection with security needs, project scenarios, and client capabilities.
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32User-Initiated OAuth 2.0 FlowsQuiz
Test your knowledge of OAuth 2.0 user-initiated flows, including Implicit, Authorization Code, and PKCE. Learn about key concepts, security challenges, and the distinctions between public and confidential clients. Sharpen your understanding of how these flows address real-world use cases while enhancing security.
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33Agenda: Advanced Security Extensions for OAuth 2.0 User-Initiated FlowsVideo lesson
Overview of OAuth 2.0 security extensions—JAR, JWE, and PAR—to address vulnerabilities in user-initiated flows with advanced protective mechanisms.
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34OAuth 2.0 User-Initiated Flows: Hacker Scenario and Authorization Request RisksVideo lesson
Discover a hacker scenario that exposes vulnerabilities in OAuth 2.0 user-initiated flows, including PKCE, and understand the risks of tampering with authorization request parameters.
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35Understanding the JWT Secured Authorization Request (JAR) in OAuth 2.0Video lesson
Learn how the JWT Secured Authorization Request (JAR) enhances OAuth 2.0 flows by securing authorization request parameters. Discover how JAR mitigates tampering risks and ensures integrity.
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36The Limitation of JAR: Hacker Scenario and Security ChallengesVideo lesson
Dive into the security challenges of the JWT Secured Authorization Request (JAR) in OAuth 2.0 flows. Learn how a hacker could exploit the lack of confidentiality in authorization requests and why this is a critical issue.
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37Asymmetric Encryption Explained: Ensuring Confidentiality in OAuth 2.0Video lesson
Discover how asymmetric encryption protects sensitive data in OAuth 2.0. Learn how public/private keys ensure confidentiality in communication and secure authorization flows.
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38Enhancing OAuth 2.0 Security with JWE: Confidentiality in Authorization RequestsVideo lesson
Learn how JWE (JSON Web Encryption) secures OAuth 2.0 authorization requests. Discover its role in protecting sensitive data, mitigating risks, and addressing security challenges.
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39OAuth 2.0 Pushed Authorization Requests (PAR): Simplified and SecureVideo lesson
Discover how Pushed Authorization Requests (PAR) secures OAuth 2.0 authorization requests by eliminating URL-based vulnerabilities. Learn its steps, advantages, and integration with other security measures like JWT Secured Authorization Request (JAR).
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40Combining OAuth 2.0 Security Extensions: PAR, JAR, and JWEVideo lesson
Learn how to enhance security by integrating PAR, JAR, and JWE. Explore step-by-step workflows that ensure integrity, authenticity, confidentiality, and address specific security challenges.
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41OAuth 2.0 Security Extensions: Recap, Use Cases, and Decision TreeVideo lesson
Discover OAuth 2.0 security extensions like JWT Secured Authorization Request (JAR), JSON Web Encryption (JWE), and Pushed Authorization Request (PAR). Learn how to apply each extension using a decision tree based on security requirements, project needs, and compliance considerations.
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42Advanced Security for User-Initiated OAuth 2.0 FlowsQuiz
Test your understanding of advanced OAuth 2.0 security extensions, including JAR, JWE, and PAR. Learn how these flows address critical security challenges in user-initiated authorization flows, and master when to combine these mechanisms for maximum security.
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43Exploring the OAuth 2.0 ROPC Flow: Use Cases and RisksVideo lesson
Discover the OAuth 2.0 ROPC flow, designed for rare cases where user redirection isn't feasible. Understand its workings, associated risks, and why it's deprecated in OAuth 2.1. Learn when and how to use it securely.
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44Resource Owner Password Credentials (ROPC) FlowQuiz
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45Mastering the OAuth 2.0 Client Credentials Flow: Use Cases and Decision TreeVideo lesson
Explore the OAuth 2.0 Client Credentials Flow in detail. Learn its implementation, real-world use cases, and how to decide when to use it with a practical decision tree guide.
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46Mastering OAuth 2.0 Client Credentials FlowQuiz
Test your understanding of the OAuth 2.0 Client Credentials Flow. Learn its mechanics, use cases, and decision-making process to determine when this flow is the right choice for machine-to-machine communication.
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47Understanding the OAuth 2.0 Device Code Flow: A Step-by-Step GuideVideo lesson
Master the OAuth 2.0 Device Code Flow with this detailed guide. Learn to enable secure user authorization for devices with limited input, like smart TVs and IoT devices, step by step.
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48Understanding the OAuth 2.0 Device Code FlowQuiz
Test your understanding of the OAuth 2.0 Device Code Flow, its mechanics, and use cases. Learn how to securely implement authorization on devices with limited input capabilities.
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49Introduction to OAuth 2.0 Assertion Flows: JWT and SAMLVideo lesson
Discover how OAuth 2.0 assertion flows enable seamless integration with external identity providers. Learn the basics of JWT and SAML assertion flows for obtaining tokens without re-authentication.
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50Exploring the OAuth 2.0 JWT Bearer Assertion FlowVideo lesson
Learn how the OAuth 2.0 JWT Bearer Assertion Flow works. Understand its use of trusted identity providers, JWT tokens, and secure access token exchanges via the token endpoint.
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51Understanding the OAuth 2.0 SAML Bearer Assertion FlowVideo lesson
Explore the OAuth 2.0 SAML Bearer Assertion Flow. Learn how SAML assertions integrate with OAuth 2.0 to exchange access tokens securely, enabling seamless authentication via trusted identity providers.
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52OAuth 2.0 Assertion Flows: Use Cases for JWT and SAML IntegrationVideo lesson
Learn when and how to use OAuth 2.0 assertion flows with JWT and SAML. Explore practical use cases like partner integration, compliance-driven domains, legacy system bridging, and multi-organization collaboration.
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53Integrating External Identity Providers with OAuth 2.0: JWT and SAML AssertionsQuiz
Test your understanding of OAuth 2.0 assertion flows with JWT and SAML. Learn how these flows enable seamless integration with identity providers, their mechanics, and key use cases.
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54Introduction to OAuth 2.0 Advanced Client Authentication MethodsVideo lesson
Discover advanced OAuth 2.0 client authentication methods, including Client Secret, JWT Bearer, SAML Bearer, and X.509 Certificates, and their role in securing confidential clients.
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55Client Authentication in OAuth 2.0 Using Client SecretVideo lesson
Learn the simplest OAuth 2.0 client authentication method—Client Secret. Explore how confidential clients authenticate with the authorization server using securely stored credentials.
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56Client Authentication in OAuth 2.0 Using JWT Bearer AssertionVideo lesson
Explore JWT Bearer Assertion for OAuth 2.0 client authentication. Learn how symmetric and asymmetric signing secure clients, and understand integration with identity providers for enhanced security.
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57Client Authentication in OAuth 2.0 Using SAML Bearer AssertionVideo lesson
Learn how OAuth 2.0 client authentication works using SAML Bearer Assertions. Discover the process, trust setup with Identity Providers, and the role of signed XML assertions in secure client authentication.
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58OAuth 2.0 Client Authentication with mTLS and X.509 Basics (Part 1)Video lesson
Discover the foundational concepts of mutual TLS (mTLS) and X.509 certificates in OAuth 2.0. Learn how the chain of trust, certificate authorities, and key pairs enable secure client authentication.
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59OAuth 2.0 Client Authentication Using mTLS and X.509 (Part 2)Video lesson
Explore how mutual TLS (mTLS) enables secure client authentication in OAuth 2.0. Learn the role of keystores, truststores, and X.509 certificates during the TLS handshake for obtaining access tokens.
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60Choosing the Right OAuth 2.0 Client Authentication Method: Recap and Use CasesVideo lesson
Learn to evaluate and select the most suitable OAuth 2.0 client authentication method—Client Secret, JWT Bearer, SAML Bearer, or X.509 mTLS—based on security, complexity, and use case.
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61Evaluating OAuth 2.0 Advanced Client Authentication MethodsQuiz
Evaluate your knowledge of OAuth 2.0 client authentication methods, including client secret, JWT and SAML bearer assertions, and X.509 certificates with mTLS. Understand their security features and best use cases.

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