Impersonator

Please also reference this article http://blogs.msdn.com/jimmytr/archive/2007/04/14/writing-test-code-with-impersonation.aspx

How To: Use Forms Authentication with Active Directory in ASP.NET 1.1

http://msdn2.microsoft.com/en-us/library/aa302397.aspx

More on Kerberos

By default, the Microsoft® Windows® 2000 operating system uses the Kerberos protocol for authentication. This How To describes how to configure Kerberos delegation, a powerful feature that allows a server, while impersonating a client, to access remote resources on behalf of the client.

NTLM vs Kerberos

Both NTLM and Kerberos are forms of Integrated Windows Authentication. NTLM uses a challenge-response protocal to authenticatet the client to the server. It begins when the client attempts to connect to a secure application. The server sends a challenge to the client, and the client responds with a hashed value that the server can use to validate the user and password. All of this is seamless to the end user who simply sees the requested web page open in the browser. NTLM is simple, works well, and developers have often been able to ignore authentication concerns because it was essentially transparent. As security concerns have grown, however, the need for a more secure authentication provider has become increasingly obvious. This is where Kerberos comes in to the picture.

        <p>
        Kerberos is a ticket-based authentication protocol. When a client wants to access a
        secure application, it requests a ticket from the key distribution center (KDC), which is the server running Active Directory. The KDC then creates a ticket based on the user credentials stored in Active Directory. The ticket is then sent back to the client, which can only use the ticket if it has the correct password. Once the user is authenticated, the ticket is cached locally where it remains until it expires.
        </p>

Referencing a schema in an XML instance document

            
                            
            Paul McCartney
            July, 1998
            94303-12021-43892
            McMillin Publishing
                    ...