Abstract
This papers describes and is primarily concerned with the security data definition and management in a distributed data base of aggregated type, although the approach described may be applied to any distributed system architecture. A multi-level logical security architecture is presented reflecting the logical architecture of the distributed system. In particular, three security logical schemata are proposed: the network security schema, the external security schemata, and the intermediate security schemata. For each schema data models are introduced, allowing the definition and the management of security information. Mapping rules between the logical levels are discussed. Finally security mechanisms are analyzed.
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