The Confused Deputy (or why capabilities might have been invented)

  title={The Confused Deputy (or why capabilities might have been invented)},
  author={Norman Hardy},
  journal={Operating Systems Review},
This is a nearly true story (inessential details have been changed). The events happened about eleven years ago at Tymshare, a company which provided commercial timesharing services. Before this happened I had heard of capabilities and thought that they Were neat and tidy, but was not yet convinced that they were necessary. This occasion convinced me that they were necessary. Our operating system was much like Unix (aM of AT&T) in its protection structures. A compiler was installed in a… CONTINUE READING
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