Evaluation and reliability analysis of network security risk factors based on D-S evidence theory

摘要

Evaluation of the security risks of the Internet had a very important significance to enhance the security level of the Internet and take security measures to eliminate security incidents, and to reduce security risks. After constructing the index system of network security risk assessment, the Dempster synthesis rule was optimized, and the weights of each index system were determined based on D-S evidence theory. In order to verify the reliability of this method, the reliability distribution values of each index layer were synthesized by the optimized Dempster synthesis rule. We can see from the calculation results and Matlab simulation results that the reliability of the network risk level was significantly improved with the combination rule. Furthermore, the sensitivity analysis was carried out by perturbation method and individual risk factors were adjusted for comparative analysis in two different situations A, B. We can see from the results of comparative analysis that the single factor risk factor had little influence on the whole network risk level, which showed that the stability was better.