提出了一种新颖的动态分配软件许可权的协议SRMP(Software Right ManagementProtocol)。该协议将软件副本和核心代码分离,联合考虑核心代码、运行环境以及版权状态,有效地实现了安全注册、迁移。通过加密、认证和数字签名有效地保证了在网络环境中协议交互的数据安全和完整性;联机服务器动态注册核心代码,实现了动态分配软件许可权,解决了硬盘克隆攻击。
Cascading failures often occur in congested networks such as the Internet. A cascading failure can be described as a three-phase process： generation, diffusion, and dissipation of the congestion. In this account, we present a function that represents the extent of congestion on a given node. This approach is different from existing fimctions based on betweenness centrality. By introducing the concept of ＇delay time＇, we designate an intergradation between permanent removal and nonremoval. We also construct an evaluation fimction of network efficiency, based on congestion, which measures the damage caused by cascading failures. Finally, we investigate the effects of network structure and size, delay time, processing ability and packet generation speed on congestion propagation. Also, we uncover the relationship between the cascade dynamics and some properties of the network such as structure and size.
