MATLAB Web Server工具箱提供了MATLAB与网络的无缝结合,为开发基于Web网络的远程数据处理系统提供了强有力的支持。介绍了MATLAB Web Server工作原理,MATLAB Web程序处理的一般流程和相关配置文件的详细配置方法。开发了基于MATLAB Web...MATLAB Web Server工具箱提供了MATLAB与网络的无缝结合,为开发基于Web网络的远程数据处理系统提供了强有力的支持。介绍了MATLAB Web Server工作原理,MATLAB Web程序处理的一般流程和相关配置文件的详细配置方法。开发了基于MATLAB Web Server的测量平差在线计算系统,并以高程控制网平差为例,详细阐述了其程序设计中的难点和解决方法。该系统给测绘专业教学和科研带来极大的方便,同时也展示了MATLAB在远程教学领域的应用前景,为基于Web的虚拟实验室建立提供参考。展开更多
Distributed Denial of Service （DDoS） attack is a major threat to the availability of Web service. The inherent presence of self-similarity in Web traffic motivates the applicability of time series analysis in the st...Distributed Denial of Service （DDoS） attack is a major threat to the availability of Web service. The inherent presence of self-similarity in Web traffic motivates the applicability of time series analysis in the study of the burst feature of DDoS attack. This paper presents a method of detecting DDoS attacks against Web server by analyzing the abrupt change of time series data obtained from Web traffic. Time series data are specified in reference sliding window and test sliding window, and the abrupt change is modeled using Auto-Regressive （AR） process. By comparing two adjacent nonoverlapping windows of the time series, the attack traffic could be detected at a time point. Combined with alarm correlation and location correlation, not only the presence of DDoS attack, but also its occurring time and location can be deter mined. The experimental results in a test environment are illustrated to justify our method.展开更多
Distributed denial of service （DDoS） attacks exploit the availability of Web servers, resulting in the severe loss of their connectivity. We present a robust IP packets filtering mechanism which combines the detecti...Distributed denial of service （DDoS） attacks exploit the availability of Web servers, resulting in the severe loss of their connectivity. We present a robust IP packets filtering mechanism which combines the detection and filtering engine together to protect Web Servers from DDoS Attacks. The mechanism can detect DDoS attacks by inspecting inbound packets with an IP address database, and filter out lower priority IP addresses to preserve the connection for valid users by monitoring the queues status. We use the Netfilter＇s technique, a framework inside the Linux 2.4. X, to implement it on a Web server. Also, we evaluate this mechanism and analyze the influence of some important parameters on system performance. The experimental results show that this mechanism is effective against DDoS attacks.展开更多
文摘MATLAB Web Server工具箱提供了MATLAB与网络的无缝结合,为开发基于Web网络的远程数据处理系统提供了强有力的支持。介绍了MATLAB Web Server工作原理,MATLAB Web程序处理的一般流程和相关配置文件的详细配置方法。开发了基于MATLAB Web Server的测量平差在线计算系统,并以高程控制网平差为例,详细阐述了其程序设计中的难点和解决方法。该系统给测绘专业教学和科研带来极大的方便,同时也展示了MATLAB在远程教学领域的应用前景,为基于Web的虚拟实验室建立提供参考。
基金Supported by the National Natural Science Funda-tion of China (60373075)
文摘Distributed Denial of Service （DDoS） attack is a major threat to the availability of Web service. The inherent presence of self-similarity in Web traffic motivates the applicability of time series analysis in the study of the burst feature of DDoS attack. This paper presents a method of detecting DDoS attacks against Web server by analyzing the abrupt change of time series data obtained from Web traffic. Time series data are specified in reference sliding window and test sliding window, and the abrupt change is modeled using Auto-Regressive （AR） process. By comparing two adjacent nonoverlapping windows of the time series, the attack traffic could be detected at a time point. Combined with alarm correlation and location correlation, not only the presence of DDoS attack, but also its occurring time and location can be deter mined. The experimental results in a test environment are illustrated to justify our method.
基金Supported by the National Natural Science Foun-dation of China (60373075 ,60473055)
文摘Distributed denial of service （DDoS） attacks exploit the availability of Web servers, resulting in the severe loss of their connectivity. We present a robust IP packets filtering mechanism which combines the detection and filtering engine together to protect Web Servers from DDoS Attacks. The mechanism can detect DDoS attacks by inspecting inbound packets with an IP address database, and filter out lower priority IP addresses to preserve the connection for valid users by monitoring the queues status. We use the Netfilter＇s technique, a framework inside the Linux 2.4. X, to implement it on a Web server. Also, we evaluate this mechanism and analyze the influence of some important parameters on system performance. The experimental results show that this mechanism is effective against DDoS attacks.
