Improvement research of distributed DoS attack detection system

An improved distributed denial of service (DDoS) attack detection system was proposed for defending DDoS attack.The system detection was improved using bayesian methods to compute posterior probability and according to the state of the first connection was used.In order to improve system response function,the passive response is used against the intrusions by the real-time response.The result of simulation indicated that the improved system has reduced the rate of false positives and omission,and improved the real-time responsiveness.