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本文把矢量空间秘密共享方案与多重签名方案结合起来,提出了一种新的签名方案,即矢量空间秘密共享-多重签名方案,并对该方案的安全性进行了分析。在该方案中,任何参与者的授权子集能容易地产生群签名,而参与者的非授权子集不可能产生有效的群签名,验证者可通过验证方法验证个体签名和群签名的合法性。该方案能保证一个参与者的授权子集的群签名不能被其他参与者子集所伪造,而且可以跟踪被怀疑的伪造者并将其曝光。该方案能抵御各种可能的攻击。 相似文献
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数字签名是人工手动签名的一种电子模拟,盲签名是一种特殊的数字签名技术,除了满足一般数字签名的3个基本特征(不可否认;不能伪造;能够仲裁)外,盲签名还必须满足2个附加的条件:签名者不知道所签文件或消息的具体内容及在签名被文件或消息的拥有者公布后签名者不能追踪签名。现在盲签名技术被广泛地应用在很多重要的实际工作中。本文分析了基于二元仿设变换的广义ElGamal型盲签名方案,并指出了文献[4]中一些错误结论。本文在上述盲签名方案的基础上构造了他们的多重盲签名方案,他使得多个签名人能够共同对盲化的消息实施签名。 相似文献
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1IntroductionTheAsynchronousTransferMode(ATM)isconsideredapromisingtechniquetotransferandswitchvariouskindsofmedia,suchastele... 相似文献
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本文提出一种分析共享缓冲器ATM交换机性能的新方法,该方法为复杂的排队问题的求解提供了新的途径。该方法是采用Markov链一步转移概率矩阵求得信元队长稳态概率分布的精确算法,计算机模拟结果验证了该方法的有效性和正确性。 相似文献
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模块化结构的ATM交换节点的性能分析 总被引:1,自引:1,他引:0
模块化结构是形成大容量ATM交换节点的最有效手段,本文提出一种分析模块化结构的ATM交换节点性能的新方法,该方法通过引入虚队列考虑了相邻模块间的相关性,与计算机模拟相比,分析结果在整个负载变化范围内都有很高的准确性,方法适用于任意大小模块并采用输出排队和以Banyan网为互连网的ATM交换节点的性能分析。 相似文献
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Shared buffering and channel grouping are powerful techniques with great benefits in terms of both performance and implementation. Shared‐buffer switches are known to have better performance and better utilization than input or output queued switches. With channel grouping, a cell is routed to a group of channels instead of a specific output channel. In this way, congestion due to output contention can be minimized and the switch performance can therefore be greatly improved. Although each technique is well known by itself in the traditional study of queuing systems, their combined use in ATM networks has not been much explored previously. In this paper, we develop an analytical model for a shared‐buffer ATM switch with grouped output channels. The model is then used to study the switch performance in terms of cell loss probability, cell delay and throughput. In particular, we study the impact of the channel grouping factor on the buffer requirements. Our results show that grouping the output channels in a shared‐buffer ATM switch leads to considerable savings in buffer space. Copyright © 2001 John Wiley & Sons, Ltd. 相似文献
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主要讨论突发业务情况下的ATM缓存的排队性能.首先采用状态转移概率进行模型分析,然后再给出信元丢失率和信元延时的分布. 相似文献
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本文给出了ATM交换结构性能分析的有效数学方法,通过分析几种业务流情况下不同缓冲方式ATM交换结构的信元丢失率和时延特性,证明了该方法的正确性和有效性。 相似文献
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Broadband integrated services digital networks (BISDN) are designed to offer a variety of services with bit rates ranging from several kb/s (e.g. teleactions) to hundreds of Mb/s (e.g. HDTV), and in some cases approaching Gb/s (e.g. in interconnections of high-speed LANs). A multiplicity of rates and the burstiness of traffic sources lead naturally to systems based on the fast packet switching (or asynchronous transfer mode) concept. The requirements of data buffering and high-speed processing of packet headers have resulted in a plethora of proposals for ATM switching nodes and an equal number of ways for evaluating them. In particular, the class of non-blocking architectures of ATM switches has received the most attention from the research community. This paper reviews this class of architecture with emphasis on contention resolution methods and communication traffic performance. The contention resolution methods are divided into four categories: input buffering, output buffering, shared buffering, and hybrid buffering. The communication traffic characteristics are divided into two categories: uniform traffic and bursty traffic. 相似文献
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The Shared buffer memory switch (SBMS) architecture was originally proposed as an effective approach to implement ATM switch fabrics. However, in this paper we find that if an error occurs in the address chain memory of one linked list which stores the address of the next cell in the shared buffer memory, the erroneous situation will spread over all linked lists in the SBMS in a short time. In order to prevent the fault spread phenomenon, we propose two doubly linked list based architectures to combat address chain failure; these are referred to as the Flush and In-Seq schemes. The first scheme flushes the remaining cells in the faulty queue but collect their addresses for later usage. The second scheme outputs the remaining cells in their correct sequence. From our simulation, if the error injection rate is low, the performance of the In-Seq scheme experiences slight degradation compared with the errorfree situation. 相似文献
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Xuan‐Hien Dang Abdullah A. Abonamah 《International Journal of Communication Systems》2006,19(5):567-584
Grouping output channels in a shared‐buffer ATM switch has shown to provide great saving in buffer space and better throughput under uniform traffic. However, uniform traffic does not represent a realistic view of traffic patterns in real systems. In this paper, we extend the queuing analysis of shared‐buffer channel‐grouped (SBCG) ATM switches under imbalanced traffic, as it better represent real‐life situations. The study focuses on the impact of the grouping factor and other key switch design parameters on the performance of such switches as compared to the unichannel allocation scheme in terms of cell loss probability, throughput, mean cell delay and buffer occupancy. Numerical results from both the analytical model and simulation are presented, and the accuracy of the analysis is presented. Copyright © 2005 John Wiley & Sons, Ltd. 相似文献
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文章提出并实现了一种共享缓存式ATM基本交换单元的设计方案,该交换单元有6条输入输出线路,它由10片大容量FPGA组成。通过简单的电路修改,用两片超大容量FPGA可以实现9×9或18×18共享缓存的ATM基本交换单元。 相似文献