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安全路由协议设计是Ad hoc网络安全研究的重要组成部分。当前研究主要集中在采用经典密码学中的方法来保证路由安全。结合可信计算中的TPM和典型的安全路由协议ARAN,提出了一种新的安全路由协议TEARAN,该协议不再采用集中式的公钥证书分发中心PKI,而是采用TPM中的DAA(Directed Anonymous Attestation)方式来进行节点的身份认证,以及软安全中可信阂值来监测部居节点的行为,从而进行公钥可信分发,同时确保了无恶意节点加入网络,另外,也采用公钥签名、会话密钥加密来保证端到端通信的保密性、完整性和不可否认性。理论证明了提出的TEARAN协议能够实现网络的匿名安全,防范当前常见的攻击方式,达到了很好的安全保证效果。 相似文献
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在计算机网络中高效实现具有延迟约束的Multicast功能,是计算机网络应该提供的一种基本功能,是保证视频会议系统、多媒体教学系统、视频点播系统(VOD)等应用得以实现的基础。该文针对这一问题,提出了一种加速加权方法,根据已经经过的部分路径的延迟和剩余延迟,将成本加速加权,利用加权成本构造Multicast树。利用该算法,可以在计算机网络中以分布式方式建立接近最小成本、满足延迟约束条件、适于实时通信的动态Multicast连接,避免了传统方法将成本和延迟分别考虑、大量回溯的弊端。 相似文献
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To solve the problem of data integrity in cloud storage,an aggregated privacy-preserving auditing scheme was proposed.To preserve data privacy against the auditor,data proof and tag proof were encrypted and combined by using the bilinearity property of the bilinear pairing on the cloud server.Furthermore,an efficient index mechanism was designed to support dynamic auditing,which could ensure that data update operations did not lead to high additional computation or communication cost.Meanwhile,an aggregation method for different proofs was designed to handle multiple auditing requests.Thus the proposed scheme could also support batch auditing for multiple owners and multiple clouds and multiple files.The communication cost of batch auditing was independent of the number of auditing requests.The theoretical analysis and experimental results show that the proposed scheme is provably secure.Compared with existing auditing scheme,the efficacy of the proposed individual auditing and batch auditing improves 21.5% and 31.8% respectively. 相似文献
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多层分布并行处理系统WUDP91硬件系统设计 总被引:1,自引:0,他引:1
本文介绍了多层分布并行处理系统WUDP91的硬件系统的组成及功能,详细说明了WUDP91第两组动态拓扑分布并行处理环境DTPD的实现方法。 相似文献
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