title: Can a Classic ASP application be secured using HTTPModules?
body: <p>I have a classic ASP application currently secured using ASP.NET Forms Authentication running on IIS 6, the problem is our purposes require this application implement a Single-Signon security model using Entrust TruePass which uses Client Certificates I believe. Can this be implemented using ASP.NET Http Modules or do I have to write an ISAPI filter? Are there other options available?</p>