Distributed systems are vital for the efficient processing required in military applications. For these applications it is especially important that the distributed database management systems (DDBMS) should operate in a secure manner. For example, the DDBMS should allow users, who are cleared to different levels, access to the database consisting of data at a variety of sensitivity levels without compromising security. The authors focus on secure query processing in a DDBMS. Implementation of secure query processing algorithms in a DDBMS as well as an analysis of the performance of the algorithms is described.
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