基于USBkey的虚拟实验平台动态身份认证方案设计及实现

本文提出了一种基于USBkey的动态身份认证方案,该方案利用公钥密码算法和USBKey的硬件保护特性,使密钥能够安全方便的分发和保存,避免了使用时间戳带来的重放攻击的潜在风险,并能抵抗假冒攻击和口令攻击.该动态身份认证方案很好地满足了虚拟实验平台身份认证系统的实际需求.     

可信DRM中直接匿名认证的应用研究

数字版权管理(DRM)技术一直致力于数字内容的保护,特别是防止售后非法使用.而所依靠的密码学保护措施很容易被攻击和破解.为了在硬件方面加入保护,可信DRM引入了TPM安全芯片,借助TPM在身份认证、许可授权等方面加强保护.为了解决身份认证时用户隐私泄露的问题,可信DRM采用了直接匿名认证协议.在此基础上提出了基于零知识认证和ElGamal算法的双随机数签名的改进方案,并介绍了该方案在可信DRM中是如何应用的.最后经过分析得出该方案在安全性和匿名性方面都有所提高.     

一种认证方案的形式分析

首先对用于认证方案分析的BAN逻辑进行了分析并指出了它的限制,在此基础上提出了一种新的扩展,并将BAN逻辑应用到基于HMAC认证方案的分析中。通过对已实现的远程访问认证方案的分析,证明了上述扩展的有效性和合理性,分析结果表明认证方案达到了预期的安全设计目标。     

可信网络连接双向认证协议的设计与分析

针对可信网络连接认证协议的现有方案存在单向认证、平台身份和配置信息泄露、无法抵御伪装及重放攻击等安全问题,提出了一种新的认证协议。该协议通过引入可信第三方实现了双向用户身份和平台身份的认证,防止了伪装攻击。直接匿名证明方法和时间戳的应用,保护了平台身份和配置信息的安全,防止了重放攻击。采用BAN逻辑对协议进行形式化描述及分析,验证了本协议可以提高认证的安全性,具有较高的应用价值。     

远程无纸化阅卷系统身份认证机制的构建方案

首先介绍基于PKI(即“公共密钥体系”)的身份认证机制 ,然后提出远程无纸化阅卷系统中基于PKI的身份认证机制的设计和开发过程 ,接着讨论这一方案在实际应用中的使用方法 .最后 ,对该方案安全性作简要分析 .     

基于OTP的移动商务身份认证机制设计与研究

移动商务的身份认证问题已成为制约移动商务发展的瓶颈.一次性口令(OTP)技术实现简单、成本低、无须第三方认证的特点使其较适合移动商务的身份认证.利用椭圆曲线密码体制实现数字签名,提出一套基于OTP的移动商务身份认证机制,最后利用BAN逻辑方法证明了该机制的安全性.     

一种基于AAA证书和身份签名的混合认证方法

基于移动IPv6结合证书认证和身份签名认证,对移动节点安全提出一种快速、低成本和扩展性好的混合认证方法.该方法综合证书认证和身份签名认证的优点,在认证过程中不完全依赖于可信第三方的安全认证,能够实现移动节点与接入网络的双向认证.并用BAN逻辑方法对提出的改进方法进行了分析,结果表明该方法提高了移动节点的认证效率.     

对NPKI机制的形式化分析

通过一对等实体通信的实例说明了NPKI的认证原理，在分析了传统PKI公钥证书认证原理的基础上，较为具体地说明了NPKI的身份认证过程，指出了NPKI是一种高效率的证书认证机制。然后对NPKI按照BAN逻辑进行了形式化，在明确其初始条件后，按照BAN逻辑中的有关推理规则，重点证明了NPKI是一种安全可靠的身份认证机制。     

移动Adhoc网络环境下的一种安全的通信方案

移动Adhoc网是一种开放式、无中心、自组织的无线局域网,它的开放通信信道导致它在认证、路由、通信时的安全性很难得到保证。在本文,一种安全的移动Adhoc通信方案被提出,该方案首先对认证中心实行分布式管理,由多个节点协同颁发CA证书,路由建立时,利用CA证书和公钥加密技术对通信双方的信息的可靠性进行验证,在会话密钥协商时,采用Diffic-Hellman算法实现了密钥的协商与交换。最后使用BAN逻辑对该方案进行安全性分析,分析结果证明该方案具有较高的安全性和有效性。     

一种基于软令牌的企业即时通信双向认证方案

为了提高EIM(Enterprise Instant Messenger)的安全性,在对比当前常用认证技术的基础上,提出了一种结合HASH函数、对称密码机制以及挑战/应答机制的基于软令牌的双向认证方案.最后对该方案进行了性能分析.结果表明:该方案具有保护用户身份信息,防止诸如重放、假冒和穷举等常见身份认证攻击,实现双向...     

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.     

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     

Journal of Donghua University ( English Edition) Contents of Volume 31

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