On the Definition of SurvivabilityReport
The computer systems that provide the information underpinnings for critical infrastructure applica- tins, such as banking systems and telecommunications networks, have become essential to the operation of those applications. Failure of the information systems will often cause a major loss of service, and so their dependability has become a major concern. Current facets of dependability such as reliability and avail- ability, do not address the needs of critical information systems because they do not include the notion of degraded service as an explicit requirement. What is needed is a precise notion of what forms of degraded service are acceptable to the application, under what circumstances each form is most useful, and the frac- tion of time degraded service levels are acceptable. This concept is termed survivability and in this paper we show that it is a necessary new facet of dependability. W present a formal definition of survivability and present an example of its use.
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Knight, John, and Kevin Sullivan. "On the Definition of Survivability." University of Virginia Dept. of Computer Science Tech Report (2000).
University of Virginia, Department of Computer Science