Cloud Identity Federation Cheat Sheet

Cloud identity federation is the practice of extending trust across organizational and cloud-platform boundaries so that users authenticate once — in their own identity provider — and gain access to resources across AWS, Azure, GCP, and SaaS applications without maintaining separate credentials in each system. It sits at the intersection of security architecture and user experience: done well, it eliminates credential sprawl and accelerates onboarding; done poorly, it creates invisible blast radii where a single compromised signing certificate unlocks every federated application at once. The critical mental model is that federation shifts risk from password hygiene to trust-relationship integrity — your attack surface is now your IdP signing keys, your role trust policies, and your claim validation logic, not individual passwords.