基于路由器动态认证的网络安全

描述了在TCP／IP网络中,如何通过路由器对入网的机器进行动态安全认证以防止IP地址或使用者的身份被盗用,从而增强网络安全．详细地介绍了这种基于路由器的安全认证方法的实现模型,该模型由在路由器上运行的安全认证服务器和在用户机器上运行的安全客户程序,以及在网络管理工作站上运行的日志服务器构成;同时,还介绍了基于128位密钥的动态认证过程,以及密钥和日志记录的管理,最后探讨了这些方法的有效性及安全性．所描述的方法可以有效地解决如地址欺骗、非法网络活动的记录和追查等问题．     

一个基于Socket的安全授权及其认证的编程框架

描述了在Ｉｎｔｅｒｎｅｔ／Ｉｎｔｒａｎｅｔ环境下基于ＵＮＩＸＳｏｃｋｅｔ接口进行安全授权鉴别编程的基本原理及方法,着重讨论了ＴＣＰ／ＩＰ网络的编程,并给出一个客户机／服务器模式应用中的安全授权及其认证的实现框架。     

发布网络内部服务器及内网建站的方法

传统的域名服务要求用户有公网的IP地址。在局域网内通过网关、路由器上网的用户,通常只具有私网IP地址,要发布网络内部服务器,可以在网关、路由器上通过设置端口映射的方式;对于不具备设置端口映射的用户,如采用ADSL虚拟方式接入Internet的家庭用户,可以采用动态域名系统的方式实现对外发布网站。本文详细介绍了端口映射的设置方法和动态域名系统的使用方法。     

一体化标识网络中的用户身份认证协议

一体化标识网络解决了传统网络中IP地址二义性问题,是一种基于网络的身份与位置分离体系.本文在一体化标识网络中提出一种用户身份认证协议,基于该协议设计了一种利用数字证书构建的接入标识.这种接入标识唯一的表示一体化标识网络中的终端,实现用户身份信息与终端的绑定.该用户身份认证协议基于Diffie-Hellman密钥交换完成用户到用户真实身份的双向认证,采用谜题机制和无认证状态防止应答方受到DoS攻击.通过C-K安全模型分析用户身份认证协议的安全性,分析表明该协议是会话密钥安全的.     

面向Windows平台的日志远程采集系统研究

对日志进行远程集中化管理是日志管理的有效手段.但由于日志格式不统一,传统上很难将大型网络中Windows系统上的各类日志远程采集到集中的日志服务器.介绍了Windows平台上常见系统日志的概况,以及一种新的支持多平台且功能强大的日志采集工具nxlog,它可以非常方便地部署到Windows系统上并以客户端代理或者服务器模式运行,以此提出了基于nxlog的日志远程采集系统方案.实际运行结果表明,该方案具有实用、高效的特点,可有效解决大型网络中Windows系统日志远程采集的问题.     

基于P2P网络的安全路由协议设计与分析

由于P2P网络具有非中心化的特点,网络中每个节点都起到路由器的作用,容易遭受基于路由信息的攻击,而现今的路由协议还没有解决此问题．因此,在分析P2P网络安全特性的基础上,描述了有向路由和概率路由,给出了多路经密钥交换方案仿真结果表明：引入概率算法到基于P2P网络的路由协议中能有效避免密钥交换被破坏,增强网络的安全性能．     

可证明安全的多信任域认证密钥协商协议

为解决采用基于证书认证方式的网络用户与采用基于身份认证方式的网络用户之间相互认证的问题,利用对称加密、数字签名和消息认证码等技术,首先构造一个认证链路模型下会话密钥安全的认证协议,然后设计消息认证器把该协议转换成非认证链路模型下的会话密钥安全的认证协议,并对该协议的安全性进行了分析.分析表明,该协议实现了不同认证方式的信任域中用户间的认证、密钥协商以及密钥更新,并在Canetti-Krawczyk(CK)模型下满足安全属性需求.此外,该协议仅需4次通信即可完成,且扩展性好,为不同认证机制的网络用户间认证提供了一种较为实用的解决方案.     

Web服务器的安全与认证技术

提出了Web服务器安全的两个层次:数据传输的安全和内容的安全。介绍了Web服务常用的安全技术:对称密钥加密系统和非对称密钥加密系统。论述了SSL安全协议的安全机制和它在Web上的应用。介绍了利用WindowsNT作为Web服务器架设企业网站如何进行网站安全认证的方法。     

基于Ad Hoc网络的安全路由技术的研究

为防止Ad Hoc网络路由消息的伪造和篡改问题,本文提出了一种安全有效的路由方案SERS（Secure and Efficient Routing Scheme）.在DSR（动态源路由协议）中引入了安全机制,在尽可能降低网络资源消耗的基础上,采用SUCV（statistically unique and cryptographically verifiable）标识符避免密钥分发问题,并运用公钥PK与IP地址的绑定来完成密钥分发过程,使用公钥PK与IP地址的绑定来完成密钥分发过程,使得没有密钥的节点不可能伪造报文.使用基于端到端的认证和基于对称密钥的认证检测出被篡改后的报文,从而保证路由消息的不可伪造、并防止其它节点对消息的篡改.实验结果表明,采用该方案能够满足设计的要求.     

基于身份的多服务器认证密钥协商方案

将基于身份的密码体制与远程多服务器密钥协商相结合,提出一种基于身份的远程多服务器密钥协商方案.用户注册时由私钥生成中心颁发私钥并安全存放于智能卡中.用户登录服务器前,双方采用基于身份的双线性配对计算进行双向身份认证,并协商生成会话密钥.服务器端无须保存口令表,用户端无须建立数据表存储相关登录信息,无须在终端能离线更改登录口令.该方案减少了密钥协商的通信开销、计算开销以及存储开销,在标准BR安全模型下该方案被证明是安全的.     

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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