查询词典 group scheme

Though the analysis, taking different strategy according to the threshold signature synthetist\'s role, a bilinear mapping based threshold group signature scheme in which synthetist is a group member was proposed, as well as a bilinear mapping based threshold group signature scheme with forward security in which synthetist is security mediator was proposed.

在分析的基础上，根据门限签名合成者身份的不同采用不同的设计策略，提出了一个基于双线性映射的门限群签名方案，以及一个基于双线性映射的前向安全的门限群签名方案。

From now on the reduction rule according to the Group Scheme may only be used once.

从现在起，根据集团模式的减免规则可能只能使用一次。

This paper proposes a new revocation method of membership based on the ACJT group scheme.

在ACJT群签名方案的基础上，提出了新的成员撤消方法。

Finally this thesis analyses the efficient revocable group signature scheme with forward security proposed by Chen Shaozhen and Li Daxirig. An adversary can personate a legal group member by forge a group membership certificate, and then can forge group signatures that can be verified by a verifier. And the group manager can also forge group signatures that can be verified by a verifier. So the scheme is insecure. Meanwhile, there are redundancy steps in the scheme, thus the efficiency is low.

接着，对陈少真和李大兴提出的一种有效取消的前向安全群签名方案进行了密码学分析，一方面，攻击者可以通过伪造群成员证书来伪造能够通过验证的群签名；同时，群管理员也可以伪造一个可以通过验证的群签名，因此，该群签名体制是不安全的；另一方面，该体制存在冗余数据。

To further enhance the security and connectivity for wireless sensor networks,proposed an improved key management scheme.Introduced the scheme,a random key predistribution using multiple key spaces and multipath key reinforcement was based on group-based deployment model which in the paper of DU Wen-liang.

为了进一步提高无线传感器网络的安全连通性，在分析DU Wen-liang等人的group-based节点投放模型的基础上，提出了一种改进的密钥管理方案：多密钥空间与多路径增强相结合的随机密钥预分配方案。

To further enhance the security and connectivity for wireless sensor networks,proposed an improved key management scheme.introduced the scheme,a random key predistribution using multiple key spaces and multipath key reinforcement was based on group-based deployment model which in the paper of du wen-liang.analysis and simulations show that the scheme has lower memory and communication overheads, better ability against attacks besides good security performance.

为了进一步提高无线传感器网络的安全连通性，在分析du wen-liang等人的group-based节点投放模型的基础上，提出了一种改进的密钥管理方案：多密钥空间与多路径增强相结合的随机密钥预分配方案。结果分析表明，该方案需要较少的内存存储空间，不仅提高了系统的连通性，还降低了节点的被捕获概率。

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一个致力向着太阳奔跑的年轻团队，一个始终站在中国地产营销策划&智高点&的新锐团队，依托华中科技大学品牌传播研究所的专业平台和湖北工业大学艺术设计学院的技术支持，以&智者无惑·勇者无畏·仁者无敌&的企业精神专注地产营销策划行业，以国际化视野专注地产营销策划事业，并兼顾区域策划、城市营销策划、企业品牌策划、企业战略策划、企业形象策划等。

By introducing XOR operation and one-way function chains to group key management schemes based on the keys tree, a new group key management scheme based on the keys tree, XOR operation and one-way function chains is proposed. Initialization, member adding and member evicting operations are introduced. The new scheme is compared with three other group key management schemes which are based on the keys tree:SKDC, LKH, and OFT. As far as transmission, computation and storage costs are concerned, the performance of the new group key management scheme is the best.

摘 要：在基于密钥树的组密钥管理方案中引入了XOR操作以及单向函数链，提出了一种新的基于密钥树、XOR操作以及单向函数链的组密钥管理方案，介绍了新方案中初始化、成员加入以及成员退出的操作，将新方案与3种基于密钥树的组密钥管理方案SKDC，LKH，OFT进行了比较，数据表明：就传输、计算以及存储开销而言，新的组密钥管理方案性能最优。

In order to study the effect of PPh_2 group in the application of chiral ligands 4, 5, 7 and 8 to asymmetric reactions, two ferrocenyl amino alcohols 9a and 9b were Scheme 3 synthesized from chiral amino alcohol derived imines 3 (Scheme 3) and applied in the same asymmetric reactions.

为了探讨二苯氧膦基在配体参与不对称催化反应时对其催化活性和选择性的影响，合成了两个手性二茂铁基氨基醇配体9a和9b(Scheme 3)。

The main results obtained are as follows:(1)A new multisignature scheme for specified group of verifiers is proposed;(2) A new signature scheme with threshold shred verification is proposed. Based on the proposed scheme, a new password shared authentication scheme is presented to repair the security flaw in Qi et als scheme;(3) We point out some weaknesses of two directed signature scheme proposed by Lim et al.

作者取得的主要研究成果如下：(1)提出一个新的针对指定接收组的多重签名方案；(2)提出一个新的门限共享验证签名方案，并设计了一个新的口令共享认证方案，该方案可以弥补祁明等的方案的不足；(3)指出Lim et al。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。