Network Security Risk Assessment Based on Node Correlation

Abstract

A network security risk assessment method based on node correlation is proposed in order to solve the problem that little consideration is given to node correlation and diversity in tradition network security risk assessments. This method which is based on Hidden Markov model quantifies security risk of the node through indirect risks caused by the direct risks and correlations of nodes. Combined the security risk and the importance of the node, the overall risk of the target network is calculated. This method can evaluate network security risk more accurately and provide basis for the formulation of network security policy.