Do we have any good resources on WebServices Security? Any book, pdfs, articles and even the detail answers regarding the securing web services would be appreciated.
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OWASP (The Open Web Application Security Project) provides a lot of resources for developers and pen-testers.
To the degree that web applications qualify as web services, are accompanied by web service APIs, or can be hardened/probed using the same techniques as web services, OWASP is a great resource.
You might start at their Web Services page.