Information Security Defense Situation Assessment of Network Warfare Based on Dynamic Bayesian Network

With the development of global informatization, increasingly rampant information security event has caused wide attention of people to information security problem. However, current information security technology based on traditional defense technology is hard to deal with it. Therefore, experts of information security start to focus on information security technology research based on active defense thought. At present, research on information security defense technology mainly focuses on active defense for information security relevant to security situation evaluation and security threat prediction. From the perspective of technology, based on Bayes Model, research has been implemented to security situation evaluation method in information security field and attack route prediction method. This paper puts forward a kind of evaluation method for evaluating overall system security and vulnerabilities severity degree, which can effectively evaluate overall system security and vulnerabilities severity degree.; firstly, it puts forward a kind of Cause Result Detection Algorithm (CRDA) to confirm causal relationship; secondly, it provides Bayes Attach Diagram and provide generation algorithm BAGA of BAG according to system structure of attack model; finally, it is proved that the method can effectively solve error calculation problem of node confidence coefficient by experiment to accurately predict transmission route of network threat.