低速率拒绝服务(LDoS,low-rate denial of service)攻击是一种新型的周期性脉冲式DoS攻击。根据LDoS攻击的特点,通过估算正常TCP流的超时重传(RTO,retransmission time out),模拟产生LDoS攻击的周期流量,对网络目标在攻击下的性能进行...低速率拒绝服务(LDoS,low-rate denial of service)攻击是一种新型的周期性脉冲式DoS攻击。根据LDoS攻击的特点,通过估算正常TCP流的超时重传(RTO,retransmission time out),模拟产生LDoS攻击的周期流量,对网络目标在攻击下的性能进行了测试。重点研究了Web和FTP 2种服务器在LDoS攻击下吞吐量(thoughtout)性能的变化。实验表明,LDoS攻击具有隐蔽性强和破坏力大的特点,比洪(flood)攻击更具有危害性,此研究成果为LDoS攻击的检测和防御提供了依据。展开更多
Software Defined Networking(SDN) is a revolutionary networking paradigm towards the future network,experiencing rapid development nowadays.However,its main characteristic,the separation of control plane and data plane...Software Defined Networking(SDN) is a revolutionary networking paradigm towards the future network,experiencing rapid development nowadays.However,its main characteristic,the separation of control plane and data plane,also brings about new security challenges,i.e.,Denial-of-Service(DoS) attacks specific to Open Flow SDN networks to exhaust the control plane bandwidth and overload the buffer memory of Open Flow switch.To mitigate the DoS attacks in the Open Flow networks,we design and implement SGuard,a security application on top of the NOX controller that mainly contains two modules:Access control module and Classification module.We employ novel six-tuple as feature vector to classify traffic flows,meanwhile optimizing classification by feature ranking and selecting algorithms.All the modules will cooperate with each other to complete a series of tasks such as authorization,classification and so on.At the end of this paper,we experimentally use Mininet to evaluate SGuard in a software environment.The results show that SGuard works efficiently and accurately without adding more overhead to the SDN networks.展开更多
文摘低速率拒绝服务(LDoS,low-rate denial of service)攻击是一种新型的周期性脉冲式DoS攻击。根据LDoS攻击的特点,通过估算正常TCP流的超时重传(RTO,retransmission time out),模拟产生LDoS攻击的周期流量,对网络目标在攻击下的性能进行了测试。重点研究了Web和FTP 2种服务器在LDoS攻击下吞吐量(thoughtout)性能的变化。实验表明,LDoS攻击具有隐蔽性强和破坏力大的特点,比洪(flood)攻击更具有危害性,此研究成果为LDoS攻击的检测和防御提供了依据。
基金supported by the National key Research and Development Program of China(No.2016YFB0800100,2016YFB0800101)the National Natural Science Fund for Creative Research Groups Project(No.61521003)the National Natural Science Fund for Youth Found Project(No.61602509)
文摘Software Defined Networking(SDN) is a revolutionary networking paradigm towards the future network,experiencing rapid development nowadays.However,its main characteristic,the separation of control plane and data plane,also brings about new security challenges,i.e.,Denial-of-Service(DoS) attacks specific to Open Flow SDN networks to exhaust the control plane bandwidth and overload the buffer memory of Open Flow switch.To mitigate the DoS attacks in the Open Flow networks,we design and implement SGuard,a security application on top of the NOX controller that mainly contains two modules:Access control module and Classification module.We employ novel six-tuple as feature vector to classify traffic flows,meanwhile optimizing classification by feature ranking and selecting algorithms.All the modules will cooperate with each other to complete a series of tasks such as authorization,classification and so on.At the end of this paper,we experimentally use Mininet to evaluate SGuard in a software environment.The results show that SGuard works efficiently and accurately without adding more overhead to the SDN networks.
