computer science

WS-Federation

WS-Federation is a computer science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand WS-Federation rather than just read about it. In short: WS-Federation (Web Services Federation) is an Identity Federation specification, developed by a group of companies: BEA Systems, BMC Software, CA Inc. (along with Layer 7 Technologies now a part of CA Inc.), IBM, Microsoft, Novell, Hewlett Packard Enterprise, and VeriSign.

Key takeaways

WS-Federation belongs to computer science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect WS-Federation to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of WS-Federation from memory before moving on to harder problems.

Reference excerpt

WS-Federation (Web Services Federation) is an Identity Federation specification, developed by a group of companies: BEA Systems, BMC Software, CA Inc. (along with Layer 7 Technologies now a part of CA Inc.), IBM, Microsoft, Novell, Hewlett Packard Enterprise, and VeriSign. Part of the larger Web Services Security framework, WS-Federation defines mechanisms for allowing different security realms to broker information on identities, identity attributes and authentication.

Associated specifications The following draft specifications are associated with WS-Security:

WS-SecureConversation WS-Federation WS-Authorization WS-Policy WS-Trust WS-Privacy

See also List of Web service specifications Web Services SAML XACML Liberty Alliance OpenID

External links WS-Federation 1.2 specification Whitepaper: Understanding WS-Federation Archived 2016-03-15 at the Wayback Machine Whitepaper: Federation of Identities in a Web Services world

Worked examples

Example 1 — a first encounter with WS-Federation

Start with the simplest possible case. Write down what WS-Federation claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In computer science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to WS-Federation before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about WS-Federation ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of WS-Federation

In research: WS-Federation appears in computer science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses WS-Federation in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: WS-Federation is common in secondary-school and first-year university syllabi. It links to neighbouring topics Computer access control, Computer network stubs, Federated identity, so understanding it makes those chapters shorter.
In everyday life: Look for WS-Federation outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study WS-Federation in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what WS-Federation means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain WS-Federation out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is WS-Federation in simple terms?

Why does WS-Federation matter?

Because it connects several computer science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study WS-Federation?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on WS-Federation.