Distributed Secure Systems: Then and Now

摘要: The early 1980s saw the development of some rather sophisticated distributed systems. These were not merely networked file systems: rather, using remote procedure calls, hierarchical naming, and what would now be called middleware, they allowed a collection systems to operate as coherent whole. One such system in particular was developed at Newcastle that pre-existing applications (Unix) used, completely unchanged, components an apparently standard large (multiprocessor) Unix system. secure (DSS) described our 1983 paper proposed new way construct by exploiting design freedom created this form computing. DSS separated security concerns policy enforcement from those due resource sharing used variety mechanisms (dedicated components, cryptography, periods processing, separation kernels) manage ways simpler than before. In retrospective, we provide full original text paper, prefaced introductory discussion context its time, followed account subsequent implementation deployment industrial prototype DSS, description modern interpretation MILS architecture. We conclude outlining current opportunities challenges presented approach security.