Network security situational awareness method of multi-period assessment

After analyzing and comparing the existing security situation assessment methods,a network security situation assessment method was proposed based on time dimension,which focused on the necessity of using different methods for shortterm and long-term assessment respectively. Based on the alarm information which came from security device such as firewall and Intrusion Detection Systems(IDS),the whole short-term situation was got according to the score of destination host.Combining the result of short-term assessment and static index,the weight of long-term assessment system was determined by entropy method. The proposed assessment method divides network security situation into short-term and long-term,and makes up for the lack of setting situation assessment boundaries in terms.