Tim Wilkinson

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If sensitive information is to be included in a shared web, access controls will be required. However, the complex software needed to provide a web service is prone to failure. To provide access control without relying on such software, encryption can be used. Bob is a prototype system that supports complex access control expressions through the transparent(More)
In the mid eighties, the System Architecture Research Centre at City University developed a message-passing, UNIX compliant micro kernel (Meshix) for our own scalable distributed memory architecture (Topsy). Over the last two years we have been engaged in a research programme aimed at learning from this experience, and developing a new operating system(More)
The appearance of 64-bit processors allows a new approach t o microkernel desagn From our experience with a message passang microkernel MESHIX, we discovered that a multi-address space, POSIX architecture is unsvttable for general parallel applications development Angel was therefore deszgned to provide a more flexible envtronmeni. Central to these arms is(More)
This paper describes the current position of work on City University's Topsy project. Topsy is a new message passing multicomputer architecture. It comprises a fully Unix compatible distributed kernel, called Meshix, on top of a message based software system which in turn relies on new, high speed, communications hardware, Meshnet. A overview of the machine(More)