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The security of PKI system itself is especially emphasized during the system design and implementation process, which is in accordance with the pervasive characteristic of PKI. Second, the concept of a Trusted Key Management Center is introduced for the first time. This technology greatly strengthens key management practices and allows for smooth transition from PKI to Key Management Infrastructure . Third, certificate status mechanisms are investigated in depth, and a certificate revocation performance simulation system is devised. All these work will provide guides to practice and employment of PKI applications. Based on time constraints, a new taxonomy for authenticated dictionaries is proposed. Fourth, formal analysis of OCSP protocol is carried out; then an efficient and scalable OCSP system is developed. Fifth, the special requirements caused by the working environments of Wireless PKI are analyzed. Based on communicative hashing and dynamic Merkle hash tree, an efficient certificate status validation method suitable for WPKI is presented. Sixth, one important kind of fair exchange protocols is studied, and a new CEMBS based on RSA cryptosystem is proposed. Afterwards, a novel fair exchange protocol totally based on RSA signature scheme is devised.

在系统设计和实现的过程中,考虑到PKI作为普适性安全基础平台的特点,特别强调PKI系统自身的安全性;第二,首次在PKI系统的设计中提出了"可信密钥管理中心"的概念,这一独特设计大大地强化了密钥管理功能的实施,为PKI向密钥管理基础设施的平滑过渡提供了良好的技术准备;第三,对证书状态验证机制进行了深入研究,设计了证书状态模拟系统,以指导PKI系统和应用的部署和实施;在此基础上,基于时间约束首次给出了认证字典的一种新的分类方法;第四,对OCSP协议进行了形式化分析,设计和实现了一种高效、可扩展的OCSP系统;第五,分析了WPKI工作环境对设计安全基础平台提出的特殊要求,结合无线移动设备的具体特点,基于可交换杂凑函数和动态Merkle杂凑树设计出了一种适用于WPKI环境的高效证书状态查询机制;第六,对一类公平交换协议进行了深入的研究,从设计公平交换协议的密码基础结构出发,提出了一种新型的基于RSA密码体制的高效CEMBS;在此工作的基础上,设计了一种基于RSA密码体制的最优化公平交换协议。

ResultsAfter the first injection,the excellent and good results was obtained in 78% of the patients and after second treatment, the excellent and good results reached 9 8%.ConclusionFor the treatment of this condition,the points of injection should be selected a t the junction between dorsal part and f acies ventralis of wrist in slight flexi on,just at the middle of retinaculum and 2mm towards facies ventralis from above the point.

结果:一次封闭治疗后痊愈39例,占785;两次封闭后痊愈49例,治愈率为98%,结论:封闭治疗桡骨茎突性腿鞘炎时,可常规选用两点注射;一是腕关节轻度内收时,在腕关节的背侧面与腹侧面的交界处,支持带中间;第二点是在第一个注射点处水平向背侧移动2mm。

Based on the hypothesis of Brands, this thesis presents two off-line electronic cash system applied to small payment: one is an off-line nondivisible electronic cash system with complete anonymity, and the other is an off-line nondivisible electronic cashsystem with repealed anonymity. The two systems can solve the bottleneck problem of bank server. Furthermore, based on the concept of virtual debit as well as the payment demand of pay-per-use electronic commerce and mobile commerce, this paper designs a micro-system NPAY, which can solve the problem of extra-consuming, greatly reduce the system communication overhead, and the consumer can anonymously consume.

基于Brands假设,设计了两个适用于小额支付的离线电子现金系统:一个是具有完全匿名性的离线不可分电子现金系统,另一个是可撤消匿名性的离线不可分电子现金系统,这两个系统都较好地解决了银行服务器的瓶颈问题;针对即付即用(pay-per-use)类型电子商务和移动商务的支付需求,基于&虚借记&的概念,设计了一个微支付系统NPAY,较好地解决了消费者超额消费问题,系统的通讯开销也大大减少,并且消费者可以匿名消费。

Based on the hypothesis of Brands, this thesis presents two off-line electronic cash system applied to small payment: one is an off-line nondivisible electronic cash system with complete anonymity, and the other is an off-line nondivisible electronic cash'system with repealed anonymity. The two systems can solve the bottleneck problem of bank server. Furthermore, based on the concept of virtual debit as well as the payment demand of pay-per-use electronic commerce and mobile co mmerce, this paper designs a micro-system NPAY, which can solve the problem of extra-consuming, greatly reduce the system communication overhead, and the consumer can anonymously consume.

基于Brands假设,设计了两个适用于小额支付的离线电子现金系统:一个是具有完全匿名性的离线不可分电子现金系统,另一个是可撤消匿名性的离线不可分电子现金系统,这两个系统都较好地解决了银行服务器的瓶颈问题;针对即付即用(pay-per-use)类型电子商务和移动商务的支付需求,基于&虚借记&的概念,设计了一个微支付系统NPAY,较好地解决了消费者超额消费问题,系统的通讯开销也大大减少,并且消费者可以匿名消费。

But then, the mobile market is not only one challenge, but also one innovation of overthrowing, in front of the Symbain market share, that can supply the periscopical applied base for mobile phone games and strong internet service in the future!

不过,面对Symbian的市场份额,移动市场期待的不仅是一种挑战,而是颠覆性创新,可以未来手机游戏和手机超强的互联网服务提供可展望应用的基础!

Four cases with maxillary osteotomy developed bone unhealing in the lateral wall of the maxilla, with oral antral fistula in 2 patients. CONCLUSIONS: With orthognathic surgery and rigid internal fixation, it is easy to reduce long-standing maxillofacial fracture and recover normal occlusion.

利用正颌外科设计程序和截骨手段结合坚强内固定技术治疗颌面骨陈旧性骨折,在将错位骨愈合的骨段重新复位或设计骨段移动到位的情况下,可恢复良好的面部外形和最大限度地改善咬合关系。

It can be used in the tracking system of a mobile satellite communication system to make the beam of the directional antenna on a vehicle point to the satel...

该系统能消除载体的变速运动对输出航姿角的影响,结构简单、紧凑,成本较低,可用于定向性移动卫星通信天线跟踪卫星的开环控制系统中。

In this study, LDL was oxidized by copper ion, 2, 2'-azobis(2-amidio-propane)dihydrochloride or macrophages in the absence or presence of apoH to delineate the correlation between apoH and LDL peroxidation,. It was shown that the formation of thiobarbituric acid reactive substances and conjugated dienes was decreased and the electrophoretic mobility of LDL was reduced in the presence of apoH. It suggests that apoH exerts an antioxidative effect.

为了进一步了解脂蛋白元 H 的表现与低密度脂蛋白氧化之间的关连性,分别以铜离子、 2, 2'-azobis(2-amidio-propane)dihydrochloride (一种可生成自由基的化合物)或巨噬细胞等来氧化低密度脂蛋白,发现在有脂蛋白元 H 的存在下,不论是 thiobarbituric acid reactive substances、共轭双烯的生成以及低密度脂蛋白电泳移动速率,都受到明显抑制。

In addition, this method is used in the motion control study of spinning machine tool, and achieve good control effect

机床的工作台可视为直角坐标型的机器人,这类机器人是近似线性系统,可以采用比较复杂的迭代学习控制方法,因此,本文提出了弹性移动关节机器人的混合PID迭代学习控制律,证明了该方法的收敛性,并将这种方法应用于旋压机床的学习运动控制,达到了良好的控制效果。

A six-wheeled space exploration robot with active configuration function is proposed.

建立了轮式星体探测机器人的抗倾覆性评价模型,对六轮摇臂星体探测机器人和双曲柄滑块探测机器人的抗倾覆性进行分析和比较,提出一种提高自适应悬架机器人移动性能的措施和方法,实现了一种可主动配置的六轮摇臂星体探测机器人。

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In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国,慢性酒精中毒,肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题,你可以随时联系我。

Very pretty, but the airport looks more fascinating The other party wisecracked.

很漂亮,不过停机坪更迷人。那人俏皮地答道。