Abstract:

An improvement in the state transition model of intrusion tolerance system was proposed and a semi-Markov process (SMP) model is built. The steady-state probability of each state in the model is computed. In order to evaluate the security attributes quantitatively, the SMP model is used to study availability, integrity and confidentiality of intrusion tolerance system under four kinds of attacks. The numerical result is presented and analyzed. The results show that they are useful references to taking effective measures to tolerate the different attacks.

Key words: intrusion tolerance, state transition, semi-Markov process, security attribute