对称密码体制及其算法研究

密码算法是实现网络信息安全的基础,本文对现代密钥密码算法及体系进行了研究,介绍了对称密码体制与非对称密码体制,重点分析了对称密码体制中分组密码与序列密码算法的原理、性质,比较了分组密码与序列密码的不同应用特性。     

基于Java的网络传输信息加密解密系统的研制

在对公钥密码体制的分析基础上,研究了RSA密码体制的实现算法,设计了系统程序模块,并开发了端对端的网络传输信息加密解密系统. 结果证明,采用RSA密码体制可以研制出安全性更高的网络传输信息加密解密系统.     

基于混合密码体制的数字签名方案设计

针对网络环境下信息安全技术中基于对称和非对称密码体制的数字签名技术的不足,提出了混合方式密码体制的数字签名方案;利用密码学中基本的对称密码体制DES算法和非对称密码体制RSA算法,设计出了三种具体的方案,并对比了它们的特点.     

两种密码学体制的研究与分析

随着网络的日益普及化,人们对在网上传输信息的安全性,尤其是对敏感信息的保密性要求越来越高。文章介绍了现代密码体制的两大类：对称密码体制和非密码体制。详述了DES算法的流程,AES算法,RSA公钥算法及其原理。并对两种密码体制进行了比较分析。     

基于RSA的公钥密码系统

基于对公钥密码体制的分析,研究了RSA密码体制的实现算法,开发了端对端的网络传输信息加密解密系统,在实际网络环境条件下进行的测试证明了其安全性和可靠性.     

无线网络安全中椭圆曲线密码体制应用分析

文章对椭圆曲线密码体制(ECC)作了简要介绍，针对椭圆曲线密码体制及无线网络的特点，分析了在无线局域网及移动通信网络中与椭圆曲线密码体制相关的无线网络协议及技术．     

银行网络电子资金传送系统密钥体系的研究

探讨了银行网络电子资金传送系统密钥体系的问题,从计算机密码的学角度介绍了适合ＥＦＴ系统的密码技术的两大方向,公开密钱体系（ＲＳＡ）传统密码体系以及个人识别号,数字签名等技术,给出了运用公开密钥体制和传统密码体制实现数学签名的技术实现过程和方法。     

公开密钥密码算法及其应用技术研究

网络安全是计算机网络构建的基本要求,人们对网络安全中的密码技术也越来越关注．阐述了公钥密码技术、RSA加密算法及其在实际中的应用,讨论了RSA公钥密码体制在应用过程中的安全性及其防范措施,并对公钥密码算法的研究方向和发展动态进行了展望．     

一种基于Internet结构的数据加密传输系统

基于网络的数据安全传输问题是信息安全领域的重要课题之一.分析了对称密码和公钥密码体制优缺点及其几种通用的密码算法,建立了数据加密传输系统的网络模型,利用DES、RSA和MD5算法构建了一种能够实现数据快速加密、并具有数字签名功能的数据加密传输系统.     

移动Ad Hoc网络基于椭圆曲线密码体制的安全性研究

安全性是限制移动Ad Hoc网络广泛应用的主要瓶颈；Ad Hoc网络的安全问题表现为密钥生成、密钥管理和路由安全方面．基于椭圆曲线的密码体制以其更短的密钥长度以及较低的资源需求，更适合应用于资源有限的Ad Hoc环境中、对移动Ad Hoc网络，首先给出基于椭圆曲线密码体制的GDH、3协议产生组密钥的方案；其次利用椭圆曲线密码体制实现安全路由协议SAODV(Securing Ad Hoc on—demand distance vector muting)，并通过试验进一步验证了方案的可行性．     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with