In RFC1949,A. Ballardie proposed a method of scalable multicast key distribution based on the Core Based Tree multicast protocol fitting for wide-area IP multicasting. This paper analyses the method deeply,points out ...In RFC1949,A. Ballardie proposed a method of scalable multicast key distribution based on the Core Based Tree multicast protocol fitting for wide-area IP multicasting. This paper analyses the method deeply,points out that the model can't resist the key compromise of a single member effectively,and proposes two kinds of improvement. One is the distributed generating and distributing group data encryption key,the other one is partitioning the group into subgroups. These improvements can increase the security and lifetime of the group key,and decrease the loss of compromise of a single group key encryption key.展开更多
通过将计算机支持的协同工作(computer supported cooperative work,CSCW)的概念引入计算机支持的教育培训(com-puter based training,CBT)领域来设计与开发基于虚拟现实思想的娱乐型的教育培训软件——航空CBT,它支持在局域网环境下的...通过将计算机支持的协同工作(computer supported cooperative work,CSCW)的概念引入计算机支持的教育培训(com-puter based training,CBT)领域来设计与开发基于虚拟现实思想的娱乐型的教育培训软件——航空CBT,它支持在局域网环境下的多人协同的分布式交互仿真操作训练系统,并应用了虚拟仿真和多人异地协同的计算机应用领域的前沿技术。系统开发采用混合式网络结构,运用3D动画、DirectX、COM、WinSock技术,在Virtools Dev 3.0环境中编译运行,利用Visual Studio 6.0进行自主模块开发,以增强系统功能,优化运行性能。展开更多
文摘In RFC1949,A. Ballardie proposed a method of scalable multicast key distribution based on the Core Based Tree multicast protocol fitting for wide-area IP multicasting. This paper analyses the method deeply,points out that the model can't resist the key compromise of a single member effectively,and proposes two kinds of improvement. One is the distributed generating and distributing group data encryption key,the other one is partitioning the group into subgroups. These improvements can increase the security and lifetime of the group key,and decrease the loss of compromise of a single group key encryption key.
文摘通过将计算机支持的协同工作(computer supported cooperative work,CSCW)的概念引入计算机支持的教育培训(com-puter based training,CBT)领域来设计与开发基于虚拟现实思想的娱乐型的教育培训软件——航空CBT,它支持在局域网环境下的多人协同的分布式交互仿真操作训练系统,并应用了虚拟仿真和多人异地协同的计算机应用领域的前沿技术。系统开发采用混合式网络结构,运用3D动画、DirectX、COM、WinSock技术,在Virtools Dev 3.0环境中编译运行,利用Visual Studio 6.0进行自主模块开发,以增强系统功能,优化运行性能。
