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Protecting Unattended Computers Without Software
Carl E. Landwehr
In many environments, users log in to workstations and then leave them
unattended. Rather than trying to stop users from doing what comes
naturally, this paper suggests a simple, hardware-based system that can
protect computers in such an environment from unauthorized use by those
with physical access to the monitor and keyboard. Requirements for the
system are described, some design issues are discussed, and a sketch of a design for an initial prototype is provided, together with an
assurance argument for it. A prototype implementing many of the
concepts described has been built; two dozen copies of a second
prototype are to be installed in an office environment.
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