一种基于传播特征的蠕虫检测方法

随着计算机网络技术的飞速发展,网络蠕虫攻击成为目前影响网络安全的一个重要问题。实时监视网络蠕虫攻击,特别是在蠕虫传播早期检测到蠕虫,以采取相应的防御措施,减少蠕虫传播和攻击造成的损失变得尤为重要。通过分析网络蠕虫在传播过程中具有扩散性、链型以及传输数据相似等特征,提出了一种基于蠕虫传播特征的检测方法。实验结果表明:该检测方法在一定程度上降低了蠕虫检测的漏报率和错误率,对未知蠕虫具有较好的检测能力。     

基于传播特性的蠕虫检测方法

随着计算机网络技术的飞速发展,网络蠕虫攻击成为目前影响网络安全的一个重要问题。实时监视网络蠕虫攻击,特别是在蠕虫传播早期检测到蠕虫,以采取相应的防御措施,减少蠕虫传播和攻击造成的损失变得尤为重要。通过分析网络蠕虫在传播过程中具有扩散性、链型以及传输数据相似等特征,提出了一种基于蠕虫传播特征的检测方法。实验结果表明:该检测方法在一定程度上降低了蠕虫检测的漏报率和错误率,对未知蠕虫具有较好的检测能力。     

基于失败连接流量偏离度的蠕虫早期检测方法

通过分析网络蠕虫攻击的特点，定义了能够反映蠕虫攻击特征的失败连接流量偏离度（FCFD）的概念，并提出了一种基于FCFD时间序列分析的蠕虫早期检测方法。该方法利用小波变换对FCFD时间序列进行多尺度分析，利用高频分量模极大值进行奇异点检测，从而发现可能的蠕虫攻击。同时给出了一种基于失败连接分析的蠕虫感染主机定位和蠕虫扫描特征提取方法。实验结果显示，该方法能够有效检测未知蠕虫的攻击。和已有方法相比，该方法具有更高的检测效率和更低的误报率。     

基于阴性选择的网络蠕虫抑制模型

基于免疫系统的阴性选择机制,提出一种网络蠕虫抑制模型。通过主机的程序行为异常,检测蠕虫攻击并及时响应,允许主机进行大部分的正常网络通信,防止蠕虫通过主机继续传播。主机发出基于阴性选择过滤的网络服务请求,依据蠕虫的传播特征,网络主机之间相互协同,推断蠕虫所攻击的服务并进行限制。实验结果表明,该模型能有效检测并抑制传统蠕虫及拓扑蠕虫等传播隐秘的新型蠕虫。     

一种混合的网络蠕虫检测方法

提出一种综合采用网络蠕虫行为检测和网络蠕虫反馈检测的混合蠕虫检测方法.在网络蠕虫行为检测方面,将一个局域网作为一个访问模型对于蠕虫进行检测.在网络反馈蠕虫检测方面,利用网络对于蠕虫攻击反馈的信息作为网络反馈检测方法的特征.然后,通过CUSUM(Cumu lative Sum)算法将以上两种检测方法综合考虑来提高网络蠕虫检测的准确性.实验结果表明本文提出的方法可以准确高效地检测网络蠕虫.     

基于支持向量机的蠕虫检测技术

本文依据蠕虫扫描时会产生FCC失败连接概率高和FCC连接速度快这两个网络行为,通过使用支持向量机分别学习正常主机和受蠕虫感染主机的训练样本集,然后使用训练后的分类器对待测主机进行分类,实现了蠕虫攻击的自动检测,并进行了实验验证。实验结果表明,该方法对未知扫描类蠕虫有较好的检测效果。     

基于候选组合频繁模式的骨干网蠕虫检测研究

现有的网络蠕虫检测方法大多都是基于包的检测,针对骨干网IP流检测的研究较少,同时也不能很好地描述蠕虫的攻击模式。为此研究了一种在骨干网IP流数据环境下的蠕虫检测方法,通过流活跃度增长系数和目的地址增长系数定位可疑源主机,接着采用基于候选组合频繁模式的挖掘算法(CCFPM),将候选频繁端口模式在FP树路径中进行匹配来发现蠕虫及其攻击特性,实验证明该方法能快速地发现未知蠕虫及其端口扫描模式。     

基于有向图分析的蠕虫早期检测方法

网络蠕虫给互联网带来了巨大的损失,实践证明,越早发现蠕虫的传播行为,就越有利于对蠕虫的遏制。首先分析了网络蠕虫早期传播的特征,然后借鉴GrIDS入侵检测系统的图分析思想,提出了一种利用有向图对网络蠕虫早期传播行为进行检测的蠕虫早期检测方法,并设计了有向图分析算法,对网络蠕虫与P2P应用、网络扫描以及突发访问等类网络蠕虫行为进行了准确识别。实验证明,可以准确检测网络蠕虫的早期传播行为,并定位蠕虫源主机。     

基于传播模式的本地网络蠕虫检测模型*

针对传统的蠕虫检测方法对未知蠕虫检测效率较低的问题,提出了一种基于蠕虫传播行为的优化解决方案。通过自定义二元模式向量准确描述网络蠕虫的传播行为,并构造三层安全过滤结构优化未知蠕虫检测。对比研究表明,上述方案对传播行为的改进显著提高了对未知蠕虫传播行为描述的完备性,给出了运用传播模式对感染特定蠕虫进行传播行为检测的结果。实验结果表明,方案显著提高了对未知蠕虫传播行为的准确性,可以快速地检测出入侵本地网络的扫描蠕虫。     

网络蠕虫扫描机制分析

网络蠕虫作为一种自治代理,能够在网络中迅速传播,给网络安全带来了巨大的威胁和破坏。扫描作为蠕虫攻击感染主机的前奏,对蠕虫的传播速度和范围起着决定性的作用。文章对蠕虫的扫描机制进行了较深入的探讨,并给出了防范高效网络蠕虫的措施和思路。     

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.     

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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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