Puzzle for March 13, 2002

We discussed the Bell-LaPadula Model, and noted that subjects could read and write objects only if the subjects were 
in the same compartment as objects. This leads to a notion of confinement, and raises the issue of leaking information 
among compartments. Such leakage led one security expert to speculate that, as the need for secure computing con-
tinued to climb, people would gradually shift from multi-user computing systems to single-user computer systems, 
because then information could not leak among compartments (as there are no other processes on the system to leak 
information to).

1.	How do single-user systems connected by a network (such as the Internet) differ from multi-user systems?

2.	Do you agree or disagree with the expert?