The proactive secret sharing (PSS) scheme divides the lifetime of a secret into a series of time periods, in which the shares are periodically updated without changing the secret. This paper proposes a practical method for evaluating and analyzing the security of PSS cryptosystem. Based on the response of server to the mobile attack, we apply the stochastic modeling techniques to depict the state transition of PSS cryptosystem, transferring from secure states to the compromised states. With the relationship of security to the threshold, the time period and the intrusion rate, an evaluation of security is obtained. The simulation figures show that the method is practical and applicable.
Survivability of network system is a very important issue in security field. Based on analyzing existing methods and defining the system attributes about survivability evaluation, the paper adopts StochasticPetri Net (SPN) to analyze the survivability characteristics of the telecommunication switching system. The performance and fault-repair models are depicted by SPN and the quantitative evaluation approach of main survivability attributes are presented in the paper. At last, the simulation results show that the approach is correct and efficient.
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