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Microsoft security expert Bryan Sullivan believes denial-of-service blackmail attacks will become more common as privilege escalation attacks become more difficult to execute. He demonstrates how to protect your apps against regular expression DoS threats.
MSDN Magazine May 2010
This article reviews what makes XML vulnerable to denial of service attacks and how to mitigate these attacks.
MSDN Magazine November 2009
A Security Token Service, or STS, acts as a security gateway to authenticate callers and issue security tokens carrying claims that describe the caller. See how you can build a custom STS with the "Geneva" Framework.
Michele Leroux Bustamante
MSDN Magazine January 2009
MSDN Magazine September 2002