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Ubiquitous services are currently being expanded to various applications such as uhealthcare,
u-government, u-city, etc. Security and performance issues are some key
challenges to the deployment of such emerging ubiquitous systems, and hence a CC
system for ubiquitous applications should incorporate efficient security mechanisms.
In order to guarantee a secure computer topologies system, first of all, the system should authenticate
agents. During cooperation, agents interact with other agents to get information or
request execution of other agents' actions, which may be critical. To ensure security
of such critical actions or data, we need a proper access control mechanism to ensure
that agents are engaged in only authorized activities.
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