The Microsoft Anti-Cross Site Scripting Library V4.0 (AntiXSS V4.0) 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:- A customizable safe list for HTML and XML encoding- Performance improvements- Support for Medium Trust ASP.NET applications- HTML Named Entity Support- Invalid Unicode detection- Improved Surrogate Character Support for HTML and XML encoding- LDAP Encoding Improvements- application/x-www-form-urlencoded encoding support
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