In order to have a secure control system, it must be designed, built, tested, implemented, maintained, and finally retired in a secure manner. The end-user needs to ask for, and be willing to pay for, secure control systems. The control system vendor needs to have the competency to develop secure control systems (if necessary in conjunction with security experts). The end-user needs to be able to work with the vendor to certify and assure via test the control system is secure when it leaves the factory.