Single Sign-On (SSO) Explained | SAML, OIDC, OAuth 2.0 & SCIM Full Guide

🔐 Welcome to IAM Foundations Module 2 —
Single Sign-On (SSO) | by Askmeidentity!

One password. One login. Access to EVERYTHING.
That's the power of SSO — and in this video,
we break down exactly how it works under the hood. 💡

Whether you're based in the US, UK, Europe or
Australia — SSO is the skill every IAM engineer,
cloud architect and security professional
MUST master in 2026. 💼

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📚 WHAT YOU'LL LEARN IN THIS VIDEO:
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🔹 2.1 — What is SSO?
▶ One set of credentials for multiple apps & services
▶ How SSO eliminates password fatigue
▶ Centralizing authentication across the enterprise
▶ SSO in workforce vs. customer (consumer) contexts

🔹 2.2 — How SSO Works: The Full Flow
▶ User → Service Provider → Identity Provider (IdP)
▶ Authentication with username/password + MFA
▶ Token/assertion issued back to the application
▶ Session reuse — no re-authentication needed
▶ Step-by-step SSO flow explained visually

🔹 2.3 — SSO Protocol: SAML 2.0
▶ Security Assertion Markup Language — XML-based
▶ Key components: IdP, SP & SAML Assertions
▶ SP-Initiated vs IdP-Initiated SSO flows
▶ Trust establishment with XML metadata exchange
▶ XML Digital Signatures (XML-DSig) with RSA-SHA256
▶ Best use cases: enterprise web apps & regulated environments

🔹 2.4 — SSO Protocol: OpenID Connect (OIDC)
▶ Built on OAuth 2.0 — uses JSON Web Tokens (JWT)
▶ Key components: OpenID Provider, Relying Party, ID Token
▶ Authorization code flow, implicit & hybrid flows
▶ PKCE for securing mobile apps & SPAs
▶ ID Token structure: sub, name, email, iss, aud, exp
▶ OIDC vs SAML: JSON vs XML, modern vs legacy

🔹 2.5 — OAuth 2.0 (Authorization Framework)
▶ OAuth 2.0 = Authorization, NOT Authentication
▶ Grant types: Authorization Code, Client Credentials,
Device Authorization
▶ Access Tokens vs Refresh Tokens
▶ Scopes — defining access levels
▶ OAuth 2.0 + OIDC working together
▶ Machine-to-Machine (M2M) with Client Credentials grant

🔹 2.6 — SCIM: System for Cross-domain Identity Management
▶ SCIM = User provisioning & deprovisioning standard
▶ RESTful API for creating, updating & deleting accounts
▶ SCIM schema: users and groups standardization
▶ How SCIM complements SAML/OIDC
▶ SSO handles login. SCIM handles lifecycle.
▶ Use cases: automated onboarding/offboarding across SaaS

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🌍 WHO IS THIS VIDEO FOR?
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✅ IT professionals in the US, UK, Europe & Australia
looking to specialize in IAM & identity security
✅ Cybersecurity engineers preparing for Okta,
Azure AD, Ping or SailPoint roles
✅ Developers building SSO integrations
with SAML, OIDC or OAuth 2.0
✅ Cloud architects designing Zero Trust
identity architectures
✅ Beginners entering the IAM field
with zero prior experience

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🎓 START YOUR IAM CAREER TODAY
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✅ What is Single Sign-On (SSO)?

SSO allows users to authenticate once and gain access to multiple applications without logging in separately to each one — using a centralized Identity Provider (IdP).

✅ What is the difference between SAML and OIDC?

SAML 2.0 is XML-based and best for traditional enterprise web applications. OIDC is JSON/JWT-based, built on OAuth 2.0, and ideal for modern APIs, mobile apps and cloud-native systems.

✅ Is OAuth 2.0 the same as SSO?

No. OAuth 2.0 is an authorization framework — it grants access to resources, not identity. OIDC extends OAuth 2.0 to add authentication, making the combination usable for SSO.

✅ What is SCIM used for?

SCIM (System for Cross-domain Identity Management) automates user provisioning and deprovisioning
across SaaS applications — it works alongside SSO to manage the full identity lifecycle.

✅ What is PKCE in OAuth 2.0?

Proof Key for Code Exchange (PKCE) is a security extension for OAuth 2.0 that protects public clients like mobile apps and Single Page Applications (SPAs)
from authorization code interception attacks.
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Видео Single Sign-On (SSO) Explained | SAML, OIDC, OAuth 2.0 & SCIM Full Guide канала Askmeidentity - Identity Experts