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CISSP 14.2 - Implementing Authentication Systems (Part 1 of 2)
This episode of the ISC2 Certified Information Systems Security Professional (CISSP) exam prep series turns from access models to the systems that carry authentication across the web, part of identity and access management in Domain 5. It studies how single sign-on works on the Internet and how organizations trust each other without leaking credentials.
What this episode covers
- Never share credentials — modern standards share proof of identity or authorization instead, so your secret stays put.
- The role of XML — a shared grammar describing what data means, with several authentication standards built on its dialects.
- SAML — an open XML-based standard with a principal, service provider, and identity provider that powers browser single sign-on.
- SAML assertions — authentication, attribute, and authorization statements returned by the identity provider after one redirect.
- OAuth — an authorization framework that trades tokens so an app can act for you without ever taking your password.
- OpenID Connect — a thin authentication layer on OAuth that carries a JSON Web Token to prove who you are.
- AAA protocols — a central gatekeeper delivering authentication, authorization, and accounting while isolating remote-access risk.
Watch the full episode above for the worked examples and detailed explanations of each concept.
Frequently Asked Questions
Why should you never hand your credentials to a third party?
Imagine wanting to move money from one bank to another. You would never give the second bank your login for the first, because that hands over the keys to your entire account. The whole point of modern authentication standards is to let one service act on your behalf without ever seeing your password. They share proof of who you are, or what you may do, while your secret stays put.
How does SAML let organizations trust each other?
Security Assertion Markup Language is an open XML-based standard that carries authentication and authorization details between federated organizations and powers single sign-on in the browser. It runs on three players: the principal is the user, the service provider is the site the user wants, and the identity provider is the trusted third party that holds the credentials. The user is redirected to the identity provider to log in, which sends back signed assertions.
How does OAuth share access without sharing passwords?
OAuth is an authorization framework, not an authentication protocol. When an app wants to act on your behalf, it redirects you to the platform, which shows exactly what the app is requesting and asks you to approve. Approve, and the platform hands the app a token, not your credentials, which the app then presents whenever it acts for you. Even if that app is later breached, your actual password was never exposed to it.
How does OpenID Connect add identity on top of OAuth?
OpenID Connect is a thin authentication layer built on the OAuth framework, and its key feature is that it delivers both authentication and authorization together. It carries a signed token, a JSON Web Token, that a service retrieves to confirm the user and can even include profile details. You see this every time you log in to one site using an account from a large provider, and the whole handshake happens quietly in the background.
What are authentication, authorization, and accounting protocols, and why do they matter?
These are protocols that provide all three services from one central point. They sit in front of remote access systems, like virtual private networks and other network access servers, giving one shared place to verify and record every connection. That central design also isolates risk, so an attack on the remote access path stays with remote users rather than reaching internal accounts, and the accounting can even feed billing.
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Reference: This article is based on concepts discussed in CISSP 14.2 - Implementing Authentication Systems (Part 1 of 2).