伪造接入点技术的智能手机拒绝服务攻防策略

随着智能手机的普及化,面向该平台的拒绝服务攻击已经成为了无线安全研究领域的一个重要研究方向。针对目前智能Android手机网络安全防护措施研究的不足,从攻击与防御两个不同角度阐述了针对该平台的拒绝服务攻击方案和防御策略。引入了伪造无线WiFi接入点技术的拒绝服务攻击方案,并且提出了应对该攻击方案的双通道验证防御模型。实验结果表明,虚假的Wi-Fi接入点技术可轻易地对智能手机发起有效的拒绝服务攻击,同时双通道验证模型可高效验证无线接入点的网络连通性,为智能手机的安全防御研究提供基础。     

网络攻击追踪技术性能分析

DoS攻击(拒绝服务攻击)和DDoS攻击(分布式拒绝服务攻击)IP追踪目前成为当今网络安全领域中最难解决的问题,IP追踪系统目的是在数据包源地址非真时识别出IP数据包源地址.对一些解决该问题最有前景的追踪技术进行了比较,以寻找更有效方法,并提出了一个新的IP追踪系统,该系统能够只用一个数据包就可以实现追踪而不需要受害者数据包.     

DDOS防御的新方法

目前,基于包标记的IP追踪和攻击包识别技术是有效防御分布式拒绝服务攻击的主要手段之一。提出一种基于确定包标记的防御新方法通过在子网中增加跟踪服务器,改变EPS编码方式,并通过边界路由器来追踪和识别攻击数据包。实验表明,方法具有追踪攻击源数量大,没有误报率,可以实现攻击包识别、单包追踪和有效保护网络拓扑的隐秘性等优点。     

基于802.15.4的低速率拒绝休眠攻击及其防御机制研究

拒绝休眠攻击是一类致力于快速耗尽节点能量的特殊拒绝服务攻击,无线传感器网络如何防御恶意节点的低速率拒绝服务攻击,保障节点正常生命周期是一个重要的问题.IEEE 802.15.4作为目前无线传感器网络较常使用的一种MAC协议,存在着信标广播漏洞.本文首次提出了一种针对该漏洞的拒绝休眠攻击方法及其防御机制,并通过仿真实验验证了攻击的危害性和防御机制的有效性.     

新的基于Huffman编码的追踪方案*

面对DDoS攻击,研究人员提出了各种IP追踪技术寻找攻击包的真实源IP地址,但是目前的追踪方案存在着标记过程中的空间问题、追踪源是否准确及追踪所需包的数量等问题.提出一种新的基于Huffman编码的追踪方案,可以节省大量的存储空间,提高空间效率,而且当遭遇DoS(拒绝服务攻击)和DDoS的攻击时能迅速作出反应,仅仅收到一个攻击包即可重构出攻击路径,找到准确的攻击源, 将攻击带来的危害和损失减小到最低程度.     

DDoS攻击原理与防范方法

分布式拒绝服务攻击是目前Internet所面临的最严峻的威胁之一。给出分布式拒绝服务攻击的原理和常用攻击方法,介绍了与其与网络病毒、漏洞和端口反弹技术相互融合的情况。分析了检测分布式拒绝服务攻击的方法,并从多个角度给出了防范措施。     

数据包标记技术综述

拒绝服务攻击（DoS）和分布式拒绝服务攻击（DDoS）一直是网络上使用频率最高的攻击方式。数据包标记技术作为一种重要应对攻击措施,是当前研究的一大热点。本文系统介绍了当前各种IP追踪中的数据包标记技术的研究成果,并对该技术的发展趋势做了简单的分析。     

基于AS协同的分布式拒绝服务攻击追踪机制研究

提出一种基于自治系统协同的分布式拒绝服务攻击的追踪算法.在该算法中,自治系统边界路由器把所在的AS信息以一定的概率对经过的数据包进行标记,受害者可通过数据包中所标记的路径信息重构出攻击路径,从而追踪到攻击源.带认证的标记方法有效地防止了攻击者伪造和篡改数据包中的路径信息.与其它追踪算法相比,该算法实现了快速实时追踪攻击源,有效地抑制了攻击流进入其它的网络,及时缓减了攻击带来的影响.     

一种无日志的快速DDoS攻击路径追踪算法

分布式拒绝服务攻击是目前Internet面临的主要威胁之一.攻击路径追踪技术能够在源地址欺骗的情况下追踪攻击来源,在DDoS攻击的防御中起到非常关键的作用.在各种追踪技术中随机包标记法具有较明显的优势,然而由于较低的标记信息利用率,追踪速度仍然不够快.为了提高追踪速度提出一种无日志的快速攻击路径追踪算法.该算法利用少量路由器存储空间和带内信息传输方式提高标记信息利用率,不仅大大提高了追踪速度,而且避免占用额外的网络带宽.     

分布式流量限速的研究与实现

流量限速技术是抵御分布式拒绝服务攻击的一种有效的应急响应措施。针对目前限流方法存在的一些缺陷,提出一种基于Overlay的分布式限流框架,并给出一些实现细节。该框架不仅为分布式限流提供了一个安全的跨域协作环境,而且借助攻击源追踪技术辅助限流,改善了限流性能。     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.     

Call for Papers The 6^th International Conference on Grid and Cooperative Computing

Recent years have seen rapid advances in various grid-related technologies, middleware, and applications. The GCC conference has become one of the largest scientific events worldwide in grid and cooperative computing. The 6th international conference on grid and cooperative computing (GCC2007) Sponsored by China Computer Federation (CCF),Institute of Computing Technology, Chinese Academy of Sciences (ICT) and Xinjiang University ,and in Cooperation with IEEE Computer Soceity ,is to be held from August 16 to 18, 2007 in Urumchi, Xinjiang, China.     

The Distributed Time-Triggered Simulation Scheme: Core Principles and Supporting Execution Engine

Distributed real-time simulation is a young technology field but its practice is under increasing demands. In recent years the author and his collaborators have been establishing a new approach called the distributed time-triggered simulation (DTS) scheme which is conceptually simple and easy to use but widely applicable. The concept was initiated in the course of developing a new-generation object-oriented real-time programming scheme called the time-triggered message-triggered object (TMO) programming scheme. Some fundamental issues inherent in distributed real-time simulation that were learned during recent experimental studies are discussed along with some approaches for resolving the issues. An execution engine developed to support both the TMOs engaged in control computation and the TMOs engaged in DTS is also discussed along with its possible extensions that will enable significantly larger-scale DTSs.     

Software-Konfigurationsmanagement in großen Softwareprojekten

Zusammenfassung Mit zunehmender Größe der Softwaresysteme verschärfen sich die für die Software-Herstellung typischen Probleme: Beherrschen großer Objektmengen, Erhalten der Systemkonsistenz, Kontrolle der ständigen Änderungseinflüsse und Gewährleisten einer langen Lebensdauer. Die Disziplin Konfigurationsmanagement bildet den methodischen Ansatz, diese Probleme besser zu beherrschen. Software-Konfigurationsmanagement faßt die Herstellung von Softwaresystemen als eine Abfolge von kontrollierten Änderungen an gesicherten Zwischen- und Endergebnissen auf. Dargestellt werden die Objekte und Funktionen des Software-Konfigurationsmanagements sowie die hierfür in großen Software-Projekten benötigten Methoden, Instanzen und Hilfsmittel.     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and     

Editorial:Brain-machine interface(BMI) and cyborg intelligence

正Brain-machine interfaces(BMIs)aim at building a direct communication pathway between the brain and an external device,and represent an area of research where significant progress has been made during the past decade.Based on BMIs,mind information can be read out by neural signals to control     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate     

SCIENCE CHINA Information Sciences SUBJECT INDEX TO VOLUME 57(2014)

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