What are the standard method known to secure WCF services or web services in general?

What I am looking for is a set of article that can help me understand the basics, so I can be sure of what I am doing.

Methods regarding secure authen开发者_如何学Gotification are the most welcome.

Thanks.

see this article about Securing WCF Services with Authentication Service. also this one on Certificate based Authentication.

take a look at Programming WCF Security in msdn library