Password-Capabilities: Their Evolution from the Password-Capability System into Walnut and Beyond

Since we first devised and defined password-capabilities as a new technique for building capability-based operating systems, a number of research systems around the world have used them as the bases for a variety of operating systems. Our original Password-Capability System was implemented on custom built hardware with a novel address translation and protection scheme specifically designed to support password-capabilities. The password-capability concept later formed the basis of Opal developed at the University of Washington, and Mungi from the University of New South Wales, both of which used commercially available hardware. A second generation password-capability based system, Walnut, was developed at Monash University in the 1990s. Walnut was designed to run on commercially available hardware. It addressed some shortcomings of the original Password-Capability System but had to sacrifice some features that depended on hardware support. A third generation system that will extend Wal...

• Type: Conference
• Year: 2001
• Where: APCSAC
• Authors: Ronald Pose
• Keywords: APCSAC 2001, Available Hardware, Computer Architecture, Operating Systems, Original Password-capability System