Multilevel Databases

Multilevel Databases

Alban Gabillon (IUT de Mont de Marsan, France)
Copyright: © 2005 |Pages: 7
DOI: 10.4018/978-1-59140-560-3.ch065
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In the context of multilevel security, every piece of information is associated with a classification level, and every user is associated with a clearance level. The classification and clearance levels are taken from the same set of security levels. This set is totally or partially ordered and forms a lattice. The ordering relation is called the dominance relation and is denoted by ³. An example of a totally ordered set is {Unclassified, Confidential, Secret} with Secret > Confidential > Unclassified. An example for a partially ordered set is {low, (Secret, NATO), (Secret, Defence), high} with (Secret, NATO) > low, (Secret, Defence) > low, high > (Secret, NATO), high > (Secret, Defence), (Secret, NATO) and (Secret, Defence) are incomparable.

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