A dynamic protocol stack(DPS) for ad hoc networks, together with a protocol stack construction scheme that is modeled as a multiconstrained knapsack problem is proposed. Compared to the traditional static protocol sta...A dynamic protocol stack(DPS) for ad hoc networks, together with a protocol stack construction scheme that is modeled as a multiconstrained knapsack problem is proposed. Compared to the traditional static protocol stack, DPS operates in a dynamic and adaptive manner and is scalable to network condition changes. In addition, a protocol construction algorithm is proposed to dynamically construct of the protocol stack each network node. Simulation results show that, the processing and forwarding performance of our scheme is close to 1 Gb/s, and the performance of our algorithm is close to that of the classical algorithms with much lower complexity.展开更多
In networked control systems （NCS）,the control performance depends on not only the control algorithm but also the communication protocol stack.The performance degradation introduced by the heterogeneous and dynamic ...In networked control systems （NCS）,the control performance depends on not only the control algorithm but also the communication protocol stack.The performance degradation introduced by the heterogeneous and dynamic communication environment has intensified the need for the reconfigurable protocol stack.In this paper,a novel architecture for the reconfigurable protocol stack is proposed,which is a unified specification of the protocol components and service interfaces supporting both static and dynamic reconfiguration for existing industrial communication standards.Within the architecture,a triple-level self-organization structure is designed to manage the dynamic reconfiguration procedure based on information exchanges inside and outside the protocol stack.Especially,the protocol stack can be self-adaptive to various environment and system requirements through the reconfiguration of working mode,routing and scheduling table.Finally,the study on the protocol of dynamic address management is conducted for the system of controller area network （CAN）.The results show the efficiency of our self-organizing architecture for the implementation of a reconfigurable protocol stack.展开更多
基于应用层探测来识别传输层安全性协议(transport layer security,TLS)的上层服务是了解互联网服务配置和安全性的重要手段。当前的应用层扫描器在工作时依赖于默认的网络协议栈,其传输控制协议(transmission control protocol,TCP)协...基于应用层探测来识别传输层安全性协议(transport layer security,TLS)的上层服务是了解互联网服务配置和安全性的重要手段。当前的应用层扫描器在工作时依赖于默认的网络协议栈,其传输控制协议(transmission control protocol,TCP)协议专为通用场景设计,只能以受限的速率获取TLS上层服务信息;而TLS协议部分,由于现代化安全配置的软件库,与部分目标服务器不兼容。针对当前应用层扫描器识别TLS上层服务效率不高且不够全面的问题,本文从协议栈优化的角度,首先提出了一种应用于TCP协议栈的混合状态模型,通过引入无状态工作模式和优化有状态工作模式,以减少协议栈中不必要的状态维护和转换,从而提高应用层探测效率;然后,提出了一种面向TLS协议栈的宽松配置策略,通过最大限度的版本和配置兼容来与更加广泛的服务器建立TLS会话;最后,以用户态协议栈的方式将该模型和配置策略实现为异步应用层扫描器TLSnap,并通过可扩展模块的形式提供自定义接口,以支持多种TLS上层服务的识别任务。实验结果表明,在普通硬件配置下,TLSnap扫描器针对大规模端口的TLS上层服务的识别效率比当前先进方法提高3.5倍以上,且平均识别数量增加9%,有效提高了TLS上层服务识别的效率和全面性。展开更多
基金supported by the National Science and Technology Major Project of the Ministry of Science and Technology of China (Grant No. 2014ZX03006003)the ZTE Research and Development Fund
文摘A dynamic protocol stack(DPS) for ad hoc networks, together with a protocol stack construction scheme that is modeled as a multiconstrained knapsack problem is proposed. Compared to the traditional static protocol stack, DPS operates in a dynamic and adaptive manner and is scalable to network condition changes. In addition, a protocol construction algorithm is proposed to dynamically construct of the protocol stack each network node. Simulation results show that, the processing and forwarding performance of our scheme is close to 1 Gb/s, and the performance of our algorithm is close to that of the classical algorithms with much lower complexity.
基金supported by National Natural Science Foundation of China (No. 60674081,No. 60834002,No. 61074145)
文摘In networked control systems （NCS）,the control performance depends on not only the control algorithm but also the communication protocol stack.The performance degradation introduced by the heterogeneous and dynamic communication environment has intensified the need for the reconfigurable protocol stack.In this paper,a novel architecture for the reconfigurable protocol stack is proposed,which is a unified specification of the protocol components and service interfaces supporting both static and dynamic reconfiguration for existing industrial communication standards.Within the architecture,a triple-level self-organization structure is designed to manage the dynamic reconfiguration procedure based on information exchanges inside and outside the protocol stack.Especially,the protocol stack can be self-adaptive to various environment and system requirements through the reconfiguration of working mode,routing and scheduling table.Finally,the study on the protocol of dynamic address management is conducted for the system of controller area network （CAN）.The results show the efficiency of our self-organizing architecture for the implementation of a reconfigurable protocol stack.
文摘基于应用层探测来识别传输层安全性协议(transport layer security,TLS)的上层服务是了解互联网服务配置和安全性的重要手段。当前的应用层扫描器在工作时依赖于默认的网络协议栈,其传输控制协议(transmission control protocol,TCP)协议专为通用场景设计,只能以受限的速率获取TLS上层服务信息;而TLS协议部分,由于现代化安全配置的软件库,与部分目标服务器不兼容。针对当前应用层扫描器识别TLS上层服务效率不高且不够全面的问题,本文从协议栈优化的角度,首先提出了一种应用于TCP协议栈的混合状态模型,通过引入无状态工作模式和优化有状态工作模式,以减少协议栈中不必要的状态维护和转换,从而提高应用层探测效率;然后,提出了一种面向TLS协议栈的宽松配置策略,通过最大限度的版本和配置兼容来与更加广泛的服务器建立TLS会话;最后,以用户态协议栈的方式将该模型和配置策略实现为异步应用层扫描器TLSnap,并通过可扩展模块的形式提供自定义接口,以支持多种TLS上层服务的识别任务。实验结果表明,在普通硬件配置下,TLSnap扫描器针对大规模端口的TLS上层服务的识别效率比当前先进方法提高3.5倍以上,且平均识别数量增加9%,有效提高了TLS上层服务识别的效率和全面性。
