Traditional computer security revolves around access control. “It is where security engineering meets computer science.” —Ross Anderson, Security Engineering Access control is to control whom or who, has access to which resources in a system. Access control works at a number of levels from Hardware at the base, up through the Operating System, then Middleware, and up to the Application level. “As we work up from the hardware through the operating system and middleware to the application layer, the controls become progressively more complex and less reliable.” —Ross Anderson, Security Engineering Complexity tends to be at opposites with security. “Now now of the biggest challenges in computer security is preventing…