The Microsoft Anti-Cross Site Scripting Library V3.0 (Anti-XSS V3.0) is an encoding library designed to help developers protect their ASP.NET web-based applications from XSS attacks.
It differs from most encoding libraries in that it uses the white-listing technique — sometimes referred to as the principle of inclusions — to provide protection against XSS attacks. This approach works by first defining a valid or allowable set of characters, and encodes anything outside this set (invalid characters or potential attacks). The white-listing approach provides several advantages over other encoding schemes. New features in this version of the Microsoft Anti-Cross Site Scripting Library include: – An expanded white list that supports more languages – Performance improvements – Performance data sheets (in the online help) – Support for Shift_JIS encoding for mobile browsers – A sample application – Security Runtime Engine (SRE) HTTP module