Abstract
Survivability has been one of the active fields in network security recently. In order to evaluate the survivability of networked system effectively, this paper proposes a method of combining improved TOPSIS and grey relation analysis for quantitative assessment. Firstly, it normalizes indicator matrix according to traditional TOPSIS method and determines the positive and negative ideal solutions. Secondly, it calculates relation degree of every critical service in terms of grey relation analysis, according to which it gets the optimal dependency degree. Then it evaluates the whole survivability of networked system depending on the survivable function. At last a case study is given to show the availability and effectiveness of the method.
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