Single Sign-On (SSO): SAML 2.0 vs OIDC Federation
Architect enterprise federated identity: Identity Providers (IdP) vs Service Providers (SP), SAML 2.0 XML assertions, modern OIDC federation, SCIM automated user provisioning, and instant employee offboarding mechanics.
01.1. Single Sign-On (SSO) & Enterprise Identity Federation
Single Sign-On (SSO) is an access control mechanism that enables an employee to authenticate once with a centralized Identity Provider (IdP) (e.g., Okta, Microsoft Entra ID / Azure AD, Ping Identity, Google Workspace) and gain authorized access to dozens or hundreds of independent Service Providers (SP) (e.g., Slack, GitHub, Salesforce, Jira, custom enterprise SaaS apps) without typing passwords into each service.
The Security Superpower: Centralized Lifecycle & Instant Offboarding
In an enterprise without SSO, when an employee resigns or is terminated, IT administrators must manually log in to 50+ separate SaaS portals to revoke individual accounts. If one service is missed, the former employee retains unauthorized access to corporate data.
With Enterprise SSO & Identity Federation:
- One-Click Instant Offboarding: When an employee is deactivated in the corporate IdP (Okta/Azure AD), they are immediately locked out of all connected enterprise SaaS applications simultaneously.
- Centralized MFA & Adaptive Compliance: The IdP centrally enforces hardware security keys (FIDO2/WebAuthn), IP geo-fencing, and device compliance checks before issuing authentication assertions.
Enterprise SAML 2.0 SP-Initiated SSO Handshake 🏢
Enterprise SAML 2.0 SP-Initiated SSO Handshake 🏢
Cryptographically signed XML assertion exchange between Identity Provider (IdP) and Service Provider (SP).
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