Computer System Survivability Modeling

E. Garšva


Survivability is a comon, numeric characteristic of system ability to survive the incident. It is used for system comparison, and security mechanism evaluation. Modeling system survivability includes incident modelining, system description with state set {S}, and choosing survivability evaluation form. Incident uprising is Poiison process. Survivability is system functioning in the new state comparison to system functioning in normal state, and can be evaluated using diferent aspects, e.g.: minimal service survivability, relative survivability and others. Using survivability simulation model it is possible to find dependence between survivability and systems security mechanism strength or cost. Survivability is better when attacks are mild, and when the price rises it at the beginning grow quicker. Ill. 3, bibl. 7 (in Lithuanian; summary in Lithuanian, English and Russian).

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