we have designed and implemented IX, a multilevel- … [UNIX]. IX aims at sound, practical security, suitable for private- and … cooperation among privileged processes, structured management of privilege, … and processes are checked at every system call … on inputs. … [p. 673] IX supports document classification with mandatory access … IX clips the wings of the superuser. … [p. 674] IX will protect information from automated theft … laboriously by dishonest programs run on behalf of …
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