Optimal Redundancy Calculation of Self-Cleansing Intrusion Tolerant System

Intrusion tolerance is the rising third generation technology of network security. The self-cleansing intrusion tolerant system (SCITS) is a typical application of this technology. Through quantifying the redundancy of SCITS, a conclusion that a specific SCITS has an optimal redundancy which can maximize its intrusion tolerant performance is obtained in this paper. The method of computing the optimal redundancy is given, and the effect of SCITSpsilas parameters on intrusion tolerant performance and optimal redundancy is analyzed through simulation. Lastly some notes about the design of SCITS are given based on the simulation.