Encrypt Telerik WebResource Querystring
You can choose to encrypt the querystring parameters that the Telerik WebResource request has in order to make them unreadable for a third party inspecting the network traffic as of Q3 2015.
This feature affects RadScriptManager and RadStyleSheetManager, and the Telerik.Web.UI.WebResoruce.axd handler.
<appSettings>
<add key="Telerik.ScriptManager.EnableHandlerEncryption" value="true"/>
</appSettings>
You must also ensure that the encrypted URL will not be trimmed which will break the request.
. . . .
<httpRuntime maxRequestLength="204800" executionTimeout="36000" maxQueryStringLength="4096"/>
. . . .
<security>
<requestFiltering>
<requestLimits maxAllowedContentLength="209715200" maxQueryString="4096" maxUrl="4096" />
</requestFiltering>
</security>