In electronic payment system, it is more suitable to introduce the distributed electronic bank scheme in networks environment. However, in current scheme, the users obtain their cards issued by the bank in which they have opened their accounts and withdraw and store their e-coin at the bank. Due to limits of current network neckbottle and security, dispersed and mobile users in different areas, there are some defects in a practical monadic account e-bank scheme.

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After adopting the theory of large scale turbulent simulation to natural rivers, upwind scheme plus Peaceman Rachfords alternating scheme and Douglas alternating scheme are used in this model.

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Simulations show that the proposed scheme has a better performance than that of the traditional scheme when the channel information is not perfectively known at transmitter. And the scheme is obviously robust when the uncertanty of channel information changing.

仿真結果表明：當發(fā)射端獲得的信道信息不準確時，提出的算法表現(xiàn)出比傳統(tǒng)特征波束成形算法更低的誤比特率啊啊插进去在线观看免费网站视频，并且當信道信息的不確定程度變化時www.精品在线观看，提出算法的性能有很好的魯棒性。

The analysis results show that this scheme doesn't need additional memory space and increases the probability that neighbor nodes have the same key space. Compared with the pairwise key predistribution scheme, this scheme can increase the threshold of captured nodes and improve the security of WSN, and fits the network environment and meets the security requirements of WSN.

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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.

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On the basis of published paper, an ID-based provable secure and strong designated verifier signature scheme, a modified strong designated verifier signencryption scheme, and a modified extended aggregate signature scheme based on the supersingular elliptic curve is presented in this thesis.

在已有文獻的基礎上，綜合形成了一種基于身份標識的超奇異橢圓曲線上的強指定驗證者的數(shù)字簽名方案国产无码盗摄视频、簽密方案和可擴展的群簽名方案自拍日韩欧美变态在线观看。

In this paper, we have proposed a flexible encryption blocks selection buyer-seller watermarking protocol integrated the RSA asymmetric encryption system and homomorphism mechanism to protect the ownership of digital contents and fit real life. And consider the secondhand transaction in the real life. We also propose a buyer-reseller watermarking protocol based on the flexible encrypt blocks selection buyer-seller watermarking protocol to offer a solution of secondhand transaction. In our scheme, it's more light data transport requirement than other schemes. All roles in protocol will benefit by their participation. Our scheme can overcome various of the known attacks and security problems in the buyer-seller watermark protocol, such as buyer's right problem, unbinding problem, piracy tracing problem, conspiracy problem, buyer's participation in the dispute resolution problem, man-in-the-middle attack problem and anonymous problem. Furthermore, the seller and arbiter can verify the buyer's watermark without decrypting it in our scheme.

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In this paper, the first identity-based proxy signature scheme without random oracles is proposed based on Paterson, et al's identity-based signature scheme. The unforgeability of the proposed scheme is based on the hardness of the well known computational Diffie-Hellman problem.

利用Paterson等的基于身份的簽名方案構造了一個基于身份的代理簽名方案，并在標準模型下基于計算Diffie-Hellman假設證明了它的安全性91精品国产综合久久小仙女。

To realize the objective of costsaving development, a more advanced centralized pressure boost technologies of multibranch manifold station arrangement scheme has been drafted via a great deal of technical innovations, researches, comparison and selection on general scheme of station arrangement. This scheme is better fit for this "six lows" gas field.

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Firstly, the flood control regulation of TGP in Sep is computed based on the analyses on the inflow in Sep and Oct, and the risk and loss on the ahead impounding scheme is calculated and analyzed. Then, the storage level, power production and releasing discharge are achieved by computing on the electricity generation model through reservoir regulation graph. Thirdly, obstruction in channel is analyzed and the problem in the Chongqing reach is more serious in 175-145-155m scheme. The sediment aggrading process and distribution on different schemes is calculated by 1-D reservoir mathematical model. The navigation benefit is computed by navigation model. Based on above calculations, the impounding time is decided by the multi-purpose decision model, and evaluate by analytical hierarchy and balance layout model. A best impounding scheme is achieved to match the requirement of flood control electricity generation and navigation et al.

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