Systems broke at the point where trust should have been easy. You have multiple identity providers. You have applications scattered across cloud and on-prem. None of them talk to each other without friction. This is where an Identity Federation Proof of Concept comes in.
An identity federation PoC tests how separate authentication systems can share credentials and authorization securely. It verifies if users can log in once and access everything they need, regardless of the underlying provider. You measure latency, token handling, session synchronization, and fallback paths. You watch for failed handoffs, expired assertions, and mismatched claims.
Start by defining the federation protocols you will evaluate. SAML, OpenID Connect, and OAuth 2.0 remain the common standards. Your identity federation proof of concept should include configurations for at least two identity providers. Test scenarios must cover browser-based flows, API-based flows, and service-to-service authentication. Map out the mapping rules and transformation logic between identity providers.
Set up your PoC in a controlled staging environment. Deploy an identity provider (IdP) stack for each source system. Integrate them with a single service provider (SP) that acts as the unified entry point. Logging should capture every redirect, handshake, and token exchange. Use automated scripts to replay transaction flows under varying network conditions.