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两个指定验证人签名方案的安全性分析 被引量:3
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作者 曹正军 刘丽华 《软件学报》 EI CSCD 北大核心 2008年第7期1753-1757,共5页
2005年,王晓明等人把多重指定验证人签名与门限代理签名结合起来,提出了一个门限代理多重指定验证人签名(Wang-Fu).同年,陈伟东等人也提出了一个指定验证人的数字签名方案(Chen-Feng-Tan).证明Wang-Fu方案中指定验证人集合的管理者可以... 2005年,王晓明等人把多重指定验证人签名与门限代理签名结合起来,提出了一个门限代理多重指定验证人签名(Wang-Fu).同年,陈伟东等人也提出了一个指定验证人的数字签名方案(Chen-Feng-Tan).证明Wang-Fu方案中指定验证人集合的管理者可以直接伪造签名.为此,每个验证人对在验证阶段使用私钥产生的部分数据必须进行零知识证明.CFT方案不满足非传递性,即指定验证人可以向第三方证明其拥有的签名是由签名人签署的.其原因在于,该方案直接利用了Schnorr签名技巧,指定验证人很客易把拥有的签名转化为关于原始签名人公钥参数的一个普通签名. 展开更多
关键词 指定验证人签名 门限代理签名 非传递性 提名人签名 SCHNORR签名
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A simplified approach for settlement calculation of pile groups considering pile-to-pile interaction in layered soils 被引量:5
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作者 杨明辉 张小威 赵明华 《Journal of Central South University》 SCIE EI CAS 2011年第6期2131-2136,共6页
A simplified approach is presented for the analysis of the settlement of vertically loaded pile groups. In order to simulate the nonlinear pile-to-pile interaction in pile groups, the soils along the piles are assumed... A simplified approach is presented for the analysis of the settlement of vertically loaded pile groups. In order to simulate the nonlinear pile-to-pile interaction in pile groups, the soils along the piles are assumed to behave as a series of nonlinear springs subjected to the shaft shear stress at the pile/soil interface. Considering the displacement reduction induced by the pile-to-pile interaction, the shear-deformation method is adopted to approximate the displacement field of the layered soils around the piles, and the equivalent stiffness of the springs is obtained. Furthermore, the load-settlement response of pile groups is deduced by modifying the load-transfer functions to account for the pile-to-pile interaction. The settlements of a laboratory pile groups computed by the presented approach are in a good agreement with measured results. The analysis on Contrastive parameters shows that the settlements of pile group decrease with the increase of the pile space and pile length, and the part of piles exceeding the critical pile length has little contribution to the beating capacity of the pile groups. 展开更多
关键词 pile groups SETTLEMENT pile-to-pile interaction load transfer shear-deformation method
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Nonlinear analysis of pile load-settlement behavior in layered soil
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作者 吕述晖 王奎华 +1 位作者 张鹏 C.J.LEO 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第9期3615-3623,共9页
A simplified approach is presented to analyze the single pile settlement in multilayered soil. First, a fictitious soil-pile model is employed to consider the effect of layered soil beneath pile toe on pile settlement... A simplified approach is presented to analyze the single pile settlement in multilayered soil. First, a fictitious soil-pile model is employed to consider the effect of layered soil beneath pile toe on pile settlement behavior. Two approximation methods are proposed to simplify the nonlinear load transfer function and simulate the nonlinear compression of fictitious soil-pile, respectively. On this basis, an efficient program is developed. The procedures for determining the main parameters of mathematical model are discussed. Comparisons with two well-documented field experimental pile loading tests are conducted to verify the rationality of the present method. Further studies are also made to evaluate the practicability of the proposed approach when a soft substratum exists, and the results suggest that the proposed method can provide a constructive means for assessing the settlement of a single pile for use in engineering design. 展开更多
关键词 PILE load-settlement behavior fictitious soil-pile layered soil soft substratum SEDIMENT
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