Module 5 · Federation at Scale — SAML, OIDC, SCIM Patterns

Manish Garg
Manish Garg Associate of (ISC)² · RingSafe
May 14, 2026
3 min read
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Why this module exists. Federation — SAML, OIDC, SCIM — is the plumbing of modern identity. Done well, it produces single-sign-on across hundreds of SaaS with automatic user provisioning. Done badly, it produces broken integrations, security gaps, and an audit nightmare. This module covers the protocols and the operational patterns.

The three protocols

Protocol Purpose
SAML 2.0 Browser-based SSO; enterprise standard since 2005
OIDC (OpenID Connect) SSO on top of OAuth 2.0; modern API-first
SCIM Automated user provisioning and de-provisioning
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