Trusting a computer for a security-sensitive task (such as checking
email or banking online) requires the user to know something about
the computer's state. We examine research on securely capturing a
computer's state, and consider the utility of this information both
for improving security on the local computer (e.g., to convince the
user that her computer is not infected with malware) and for
communicating a remote computer's state (e.g., to enable the user
to check that a web server will adequately protect her data).
Although the recent "Trusted Computing" initiative has drawn both
positive and negative attention to this area, we consider the older
and broader topic of bootstrapping trust in a computer. We cover
issues ranging from the wide collection of secure hardware that can
serve as a foundation for trust, to the usability issues that arise
when trying to convey computer state information to humans. This
approach unifies disparate research efforts and highlights
opportunities for additional work that can guide real-world
improvements in computer security.
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