To address the problem that existing bipartite secret sharing scheme is short of dynamic characteristic, and to solve the problem that each participant can only use secret share once, this paper proposed a bipartite (...To address the problem that existing bipartite secret sharing scheme is short of dynamic characteristic, and to solve the problem that each participant can only use secret share once, this paper proposed a bipartite (n1+n2, m1+m2)-threshold multi-secret sharing scheme which combined cryptography and hypersphere geometry. In this scheme, we introduced a bivariate function and a coordinate function over finite field Zp to calculate the derived points of secret share, which can reconstruct the shared secrets by producing the intersection point of hypernormal plane and normal line on the hypertangent plane. At the initial stage the secret dealer distributes to each participant a secret share that can be kept secret based on the intractability of discrete logarithm problem and need not be changed with updating the shared secrets.Each cooperative participant only needs to submit a derived point calculated from the secret share without exposing this secret share during the process of reconstructing the shared secret. Analyses indicate that the proposed scheme is not only sound and secure because of hypersphere geometric properties and the difficulty of discrete logarithm problem, but also efficient because of its well dynamic behavior and the invariant secret share. Therefore, this bipartite threshold multi-secret sharing scheme is easy to implement and is applicable in practical settings.展开更多
Verifiable secret sharing is a special kind of secret sharing. In this paper, A secure and efficient threshold secret sharing scheme is proposed by using the plane parametric curve on the basis of the principle of sec...Verifiable secret sharing is a special kind of secret sharing. In this paper, A secure and efficient threshold secret sharing scheme is proposed by using the plane parametric curve on the basis of the principle of secret sharing. And the performance of this threshold scheme is analyzed. The results reveal that the threshold scheme has its own advantage of one-parameter representation for a master key, and it is a perfect ideal secret sharing scheme. It can easily detect cheaters by single operation in the participants so that the probability of valid cheating is less than 1/p (where p is a large prime).展开更多
高层建筑作为应对城市人口和经济增长的重要手段,是世界性城市发展的必然趋势之一。高层建筑的空间分布与高度控制对城市景观有显著影响,是城市景观控制的重要方面。本文以伦敦市为例,总结了高层建筑控制相关政策的发展历程,并从区域控...高层建筑作为应对城市人口和经济增长的重要手段,是世界性城市发展的必然趋势之一。高层建筑的空间分布与高度控制对城市景观有显著影响,是城市景观控制的重要方面。本文以伦敦市为例,总结了高层建筑控制相关政策的发展历程,并从区域控制、天际轮廓线和景观保护区三个方面详细介绍了高层建筑的控制内容和方法,同时以让·努维尔(Jean Nouvel)设计的新交易港一号(One New Change)商场为例进一步说明。最后,文章讨论了英国城市景观中的高层建筑控制对我国的启示。展开更多
文摘To address the problem that existing bipartite secret sharing scheme is short of dynamic characteristic, and to solve the problem that each participant can only use secret share once, this paper proposed a bipartite (n1+n2, m1+m2)-threshold multi-secret sharing scheme which combined cryptography and hypersphere geometry. In this scheme, we introduced a bivariate function and a coordinate function over finite field Zp to calculate the derived points of secret share, which can reconstruct the shared secrets by producing the intersection point of hypernormal plane and normal line on the hypertangent plane. At the initial stage the secret dealer distributes to each participant a secret share that can be kept secret based on the intractability of discrete logarithm problem and need not be changed with updating the shared secrets.Each cooperative participant only needs to submit a derived point calculated from the secret share without exposing this secret share during the process of reconstructing the shared secret. Analyses indicate that the proposed scheme is not only sound and secure because of hypersphere geometric properties and the difficulty of discrete logarithm problem, but also efficient because of its well dynamic behavior and the invariant secret share. Therefore, this bipartite threshold multi-secret sharing scheme is easy to implement and is applicable in practical settings.
文摘Verifiable secret sharing is a special kind of secret sharing. In this paper, A secure and efficient threshold secret sharing scheme is proposed by using the plane parametric curve on the basis of the principle of secret sharing. And the performance of this threshold scheme is analyzed. The results reveal that the threshold scheme has its own advantage of one-parameter representation for a master key, and it is a perfect ideal secret sharing scheme. It can easily detect cheaters by single operation in the participants so that the probability of valid cheating is less than 1/p (where p is a large prime).
文摘高层建筑作为应对城市人口和经济增长的重要手段,是世界性城市发展的必然趋势之一。高层建筑的空间分布与高度控制对城市景观有显著影响,是城市景观控制的重要方面。本文以伦敦市为例,总结了高层建筑控制相关政策的发展历程,并从区域控制、天际轮廓线和景观保护区三个方面详细介绍了高层建筑的控制内容和方法,同时以让·努维尔(Jean Nouvel)设计的新交易港一号(One New Change)商场为例进一步说明。最后,文章讨论了英国城市景观中的高层建筑控制对我国的启示。
