Availability Evaluation Method andImplementation Framework of MultilevelSecuerity Systems with CredibilityCharacteristics
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Graphical Abstract
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Abstract
| To evaluate and choose proper credibil-
ity evaluation functions and credibility threshold parame-
ters in the Multilevel security (MLS) system based on the
CBLP model which was proposed in the authors' previous
paper, we devised a sampling statistics method to evalu-
ate the availability of the MLS system, by obtaining the
change curve of the subjects' credibility and the rejection
ratio of access operations. The validity of this method was
evaluated according to the strong law of large numbers
and the central limit theorem. The analysis of speci¯c
scenarios showed that the result of the sampling statistics
method is highly consistent with that of the formal analy-
sis methods. Then an implementation framework based on
the availability evaluation method is proposed. Since it is
hard to evaluate the availability of the system completely
by formalization analysis, the sampling statistics analysis
method can provide an important reference for the e®ec-
tive implementation of the CBLP system.
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