Authentication Architecture Explained: Passkeys, MFA, OAuth 2.0, OIDC and SSO
Learn authentication architecture fundamentals, including passkeys, MFA, biometrics, tokens, OAuth 2.0, OpenID Connect, SAML and enterprise SSO. How should an organization design authentication that is secure, usable, scalable, and compatible with modern applications? That question sits at the heart of authentication architecture. Organizations must manage passwords, passwordless authentication, multi-factor authentication (MFA), identity federation, tokens, sessions, and enterprise single sign-
🎯 Vulnerability: OAuth 2.0 / JWT Authentication Bypass
💡 Defense Fix: Strictly verify JWT signatures on the backend, enforce state parameter validation, and reject 'alg: none'.