WLAN与3G融合网络中认证体系研究

认证体系是3G与WLAN融合网络健康发展的关键技术之一.现在研究分析EAP/SIM认证协议基础上,对EAP/SIM认证协议进行了改进,增加了共享密钥加双向认证过程.改进后的EAP/SIM认证协议在安全性上更加可靠.     

一种轻量级共享密钥认证协议

EAP是一种通用认证框架,广泛用于有线和无线局域网中。本文首先介绍了EAP协议的运行过程,然后重点介绍了EAP-PAX中两个不同的认证子协议PAX_STD和PAX_SEC。最后对EAP_PAX进行了分析,该认证方法计算量小,保持整个协议的轻量级。此外,该协议能提供双向认证和完整性保护,并抵御重放攻击。     

Radius服务器中EAP认证子系统的设计

无线网络的信息安全问题一直是限制它发展的一个重要因素.解决这个问题的一个办法是在认证服务器中部署EAP认证子系统.Radius是目前应用最广泛的AAA协议,提供用户的认证,授权和计费服务.基于EAP协议,可以在Radius服务器上支持多种不同安全性能的身份验证方法.在Radius服务器上设计了一种EAP认证子系统,该系统支持EAP-MD5、EAP-MSCHAPv2、EAP-TLS、EAP-TTLS、EAP-PEAP五种认证方法,并且具有良好的安全性和可扩展性.     

基于状态机的802.1X协议攻击检测方法

针对802.1X协议存在一定漏洞且易受重放、拒绝服务等攻击,结合802.1X协议的认证过程,抽象出802.1X协议认证的状态转移过程,同时针对802.1X协议的功能性攻击,构造出一套攻击状态转移机制:分析802.11报文和基于局域网的扩展认证协议(EAPOL)/扩展认证协议(EAP)报文的结构;剔除出重传的报文,逐个字段解析出关键字并存入链表中;将根据EAPOL/EAP报文格式取得检测所需的EAP报文存入缓存.据此,设计出基于状态机的802.1X的攻击检测方法.实验结果表明,在实际组网环境下的重放/DoS等802.1X功能性攻击能够得到准确的检测,并具有有效、统一的检测结果.     

无线局域网认证机制的改进方案

无线局域网的安全性问题已日渐成为重要的研究问题,其中,认证机制是安全机制的重要内容。无线局域网采用IEEE802．1x认证协议。本文针对IEEE802．1x／EAP—TLS认证机制存在的安全缺陷,提出了协议的改进方案,在现有认证机制的基础上增加对客户端STA和接入点AP之间的双向认证．从而提高无线局域网的安全性。     

IEEE 802.1x 认证技术的原理和应用

介绍了IEEE802．1x协议的起源、体系结构、技术特点等，指出了需要认证的端口有受控和非受控两种状态，没有通过认证前，只有EAP报文可以通过端口到达认证服务器，认证通过后，其他数据报文才可以通过。     

基于消息的加权负载均衡算法

在研究EAP协议与Diameter协议的基础上,为解决分布式认证系统节点间会话一致性的问题,以及尽可能减少服务节点数量改变时产生的会话迁移数量,提出了一种基于消息的加权负载均衡算法(MOLB)。该算法使用散列法、虚拟节点和红黑树相结合的技术,实现了客户端请求在服务节点间的合理分布。Diameter网络环境中的实验结果表明:与其他常用的负载均衡算法相比,本文算法具有较小的负载均衡度和会话破坏度以及较低的会话破坏分布度。     

基于EAP/TLS的无线局域网安全认证系统的研究与实现

根据EAP/TLS认证技术802.1x标准中的认证原理,在分析了如何在802.1x认证框架中的申者系统和认证服务器系统之间,建立安全的加密认证,以阻止未授权设备访问受限网络资源的基础上,提出了一个具体的无线局域网安全认证系统解决方案;并构建安全认证系统实验平台进行实验,从理论和实践上验证EAP-TLS认证技术对增强无线局域网安全性的可行性和实用性。     

EAP项目的本土化困境及对策分析

随着我国经济社会的迅猛发展和剧烈变革,EAP作为保障员工心理健康,调节员工行为的有效模式,已成为现代人力资源管理与开发的一项新手段。然而在我国由于传统观念滞后、服务理念错位、技术问题桎梏、专业人才匮乏、行业认证无序等因素严重制约着EAP的进一步实施和推广,针对上述制约因素,文章提出相应的对策分析,以促进EAP项目的本土化进程。     

一种基于零知识证明的远程桌面认证协议

目前桌面云环境下用户身份认证过程中用户属性可能存在泄漏。针对此种安全威胁,提出了一个远程桌面认证模型。在该模型的基础上,提出了一种基于零知识证明的远程桌面认证协议ZPBRDAP。该协议包括属性注册协议(AR协议)与身份认证协议(IA协议),在不暴露用户身份属性的同时完成用户身份认证。最后,分析了该协议的正确性、安全性以及协议效率,表明该协议具有良好的可用性。     

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.     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

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