Modern web applications offload user authentication to a centralized Identity Provider (IdP) such as Ping Identity(PingFederate \/ PingOne Advanced Identity Cloud) or Microsoft Entra ID (Azure AD). This federated login model lets multiple applications trust a single identity hub for verifying user credentials, enabling Single Sign-On (SSO): users sign in once and gain access to multiple systems. The business application (the Service Provider or OAuth Client) never sees the user’s password \u2014 it receives only security tokens from the IdP. In SAML, the application trusts the IdP’s signed assertion and grants access without ever handling the user’s credentials directly. This design improves security and user experience: credentials are managed in one hardened service, and users avoid repeating logins across apps.<\/p>\n\n\n\n
Both SAML 2.0 and OAuth 2.0 \/ OpenID Connect (OIDC) are widely-used standards enabling federation and SSO. SAML uses XML-based assertions and works best in browser-based enterprise applications, while OIDC uses lightweight JSON tokens and fits modern web, mobile, and API-driven architectures. Below is a comprehensive technical analysis of each, including how to incorporate multi-factor authentication (MFA), secure password handling, token design & validation, API security, and threat mitigations \u2014 all oriented toward designing a custom identity solution with the robustness of a commercial IdP.<\/p>\n\n\n\n