API Security

  1. Authentication Mechanisms
    1. Authentication Fundamentals
      1. Identity Verification Concepts
        1. User vs Service Authentication
          1. Authentication Factors
            1. Authentication Flows
            2. API Key Authentication
              1. Key Generation and Distribution
                1. Key Storage Best Practices
                  1. Key Rotation Strategies
                    1. Key Revocation Procedures
                      1. Usage Limitations
                      2. Basic Authentication
                        1. HTTP Basic Auth Mechanism
                          1. Security Limitations
                            1. Appropriate Use Cases
                              1. Migration Strategies
                              2. OAuth 2.0 Framework
                                1. OAuth Roles and Responsibilities
                                  1. Resource Owner
                                    1. Client Application
                                      1. Authorization Server
                                        1. Resource Server
                                        2. Authorization Grant Types
                                          1. Authorization Code Grant
                                            1. Client Credentials Grant
                                              1. Resource Owner Password Grant
                                                1. Implicit Grant
                                                  1. Authorization Code with PKCE
                                                  2. Token Management
                                                    1. Access Token Lifecycle
                                                      1. Refresh Token Usage
                                                        1. Token Revocation
                                                          1. Token Introspection
                                                          2. Security Considerations
                                                            1. Grant Type Selection
                                                              1. Client Authentication
                                                                1. Redirect URI Validation
                                                                  1. State Parameter Usage
                                                                2. OpenID Connect
                                                                  1. OIDC Layer over OAuth 2.0
                                                                    1. Identity Token Structure
                                                                      1. UserInfo Endpoint
                                                                        1. Authentication Flows
                                                                          1. Claims and Scopes
                                                                          2. JSON Web Tokens
                                                                            1. JWT Structure and Components
                                                                              1. Header
                                                                                1. Payload
                                                                                  1. Signature
                                                                                  2. Signing Algorithms
                                                                                    1. HMAC-based Signatures
                                                                                      1. RSA Signatures
                                                                                        1. ECDSA Signatures
                                                                                        2. Token Validation Process
                                                                                          1. Signature Verification
                                                                                            1. Claims Validation
                                                                                              1. Expiration Checks
                                                                                              2. Security Best Practices
                                                                                                1. Algorithm Selection
                                                                                                  1. Key Management
                                                                                                    1. Token Expiration
                                                                                                      1. Audience Validation
                                                                                                      2. Common Vulnerabilities
                                                                                                        1. Algorithm Confusion
                                                                                                          1. Weak Keys
                                                                                                            1. Token Replay
                                                                                                              1. Information Disclosure

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                                                                                                          3. OWASP API Security Top 10

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                                                                                                          5. Authorization and Access Control