In this paper we propose a management model to evaluate the tradeoffs between the cost of defence mechanisms for information systems with weighted service and the resulting expected survivability after a network attack and occurrence of incidents. It ...
In this paper we propose a management model to evaluate the tradeoffs between the cost of defence mechanisms for information systems with weighted service and the resulting expected survivability after a network attack and occurrence of incidents. It consists of three submodels: a stochastic process for the random occurrence of incidents at systems, a model for the state transition process for an attacked system given a level of defence - this depends on the type of attack and the defence mechanism installed in the system and the importance of service, and a method of estimation the expected survivability of the system given possible degradation due to these attack.
By varying the level of defence in the simulation, we examine how this expected survivability changes with the defense level. Since costs are assumed to increase with the strength of the defense system, we can derive a cost/survivability and weighed service/survivability curve that managers can use to decide on the appropriate level of defense for the network system of their organizations. The stochastic process was simulated based on parameter values obtained from actual reported data. Also in this paper, we showed how expected survivability would change with varying parameter analysis results values.