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Cloud computing can improve utilization of powerful computer systems. However, security problems become an important challenge in the cloud systems. Implementation of antivirus software can cost a lot of resource. This paper describes an access-control based architecture of operation systems which ensure the high availability of the whole system. System resource cost on security can be dropped by the implementation of this architecture. Security is a serious problem for any computer systems. Malwares exhaust system resource, steal important information and tamper important configurations.
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