Operating System Protection Domains, a New Approach

Secure computing has been an issue of high concern since the beginning of shared computers. As computers became more prevalent, so did resources shared between different users of computer systems, and naturally, users came to want to limit the access of other users to their own resources. To this end, many access control mechanisms have been devised whose general purpose are to allow access to system resources only to authorized entities. Though these methods have served us well for decades, their evolution has been overall slow.