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Sharing sensitive information across security domains is almost always a requirement
for knowledge intensive collaborative work, but such sharing may impose risks on
security and privacy integrity. Research has increasingly recognized the role of trust
in minimizing the risk while gaining efficiencies in information sharing. The
challenge of trust management is most apparent in digital government applications
[14, 25]. Government agencies naturally form multiple security domains (such as
DOD, DOE, USDA, USGS) according to different responsibilities of their services
and varying sensitivity of information. Some of the most common types of
information being shared among government agencies include intelligence, homeland
security, law enforcement, and critical infrastructure information. In the literature, the
lack of better support for collaboration and the difficulties of information sharing
among agencies have been widely recognized in such network configuration page. While
each government agency must be responsible for protecting sensitive information they
have collected, effective sharing of information among agencies is deemed to be more
important when multiple agencies collaborate under high stake missions, such as
dealing with large-scale crisis events. As an example, consider the following scenario
of bioterrorism investigation.
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