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I think it would be nice to teach security concepts by giving practical examples. I am looking for some practical cases for x509 certificates, kerberos and SET.

How could I know an ecommerse site uses SET? Or is it the defacto standard?

How could I explain kerberos from a practical view point

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1. Kerberos

The best example of explaining Kerberos from a practical viewpoint I've ever come across, is Bill Bryant's Designing an Authentication System: a Dialogue in Four Scenes. Originally intended to provide an understanding of the conceptual ideas in Kerberos, as a way to promote implemenations of KerberosV4, it does a decent job, and is quite amusing if you ask me.

2. SET

SET is not a de-facto standard, although intended and promoted as such during development. Even VISA, one of the sponsors and heavy proponents of SET, now promotes newer and more modern security standards for e-commerce.

3. X.509

The first practical case of X.509 certificates that comes to mind, is the widespread use of SSL/TLS to encrypt data transactions on websites over HTTPS

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I always liked the idea of the e-wallet aspect of SET. Not especially flexible so likely one of several reasons why it wasn't adopted. – jl01 Feb 8 '12 at 21:53

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