Database Security: Status and prospects by Pierangela Samarati, Ravi S. Sandhu (eds.)

By Pierangela Samarati, Ravi S. Sandhu (eds.)

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In this paper, we propose a Unified Security Model aiming for the integration of existing access control models, such as Mandatory Access Control and Discretionary Access Control, which could have been imposed on local components of a DOK application. Also, we extend the initial DOK multi-layered architecture proposed in (Tari et a!. 1996) to include different types of security agents allowing the enforcement of different security functions within a federated environment. Coordination agents are responsible for maintaining a federation in a secure state by delegating the different functions to specific agents, called Task agents.

Due to the rapid growth in data communications technology, databases have evolved from being central repositories of data to distributed ones, leading to the transformation of the distributed environment into federated and multidatabase environments (Sheth and Larson 1990). Security problems associated with databases have evolved accordingly, and whilst the basic need to effectively provide a secure database remains the same, the nature of the problems to be addressed has become increasingly complex.

The methods generate_access_/ist() and integrate_access_right() allow the mapping and the integration of security information of local databases into the federated level. These procedures have been described in the previous section. 3 Task level At this level, agents perform specific tasks to ensure that all the aspects of security processing are carried out properly to maintain global security. The tasks of maintaining federated security policies are delegated by the DOK manager to specialised agents such as the Global Security Processor, Query Modifier, Release Database Manager, Release Database agent and the Response Processor.

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