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From the purpose of ensuring the security and reliability of the trusted connect architecture (TCA), the issues related to quantifying its security attributes were studied, and the security threats in its bi-directional user identity authentication and platform authentication were analyzed. The trusted network connect process under attack behaviors was modeled as a stochastic Petri net. This model was used to describe attack behaviors and bi-directional authentication process in TCA. The main security attributes of confidentiality and integrity were analyzed and quantified by computing the steady state probability of a Markov model derived from the stochastic Petri net. Finally, the model analysis was illustrated in a numerical example. The method demonstrated in the study is of theoretical and practical significance.
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