A method of providing access to an authenticated user, and restricting access to an unauthorized user, of a computer system, is provided. The method includes determining whether a user is authenticated to access at least one resource included in the computer system. The method also includes establishing a session and a session identifier such that the user has access to the at least one resource if the user is authenticated to access the at least one resource. The method also includes changing the session identifier each time the user completes an interaction with the computer system during the session.