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1.
本文就Internet蠕虫的传播模型进行了研究,分析了各种传播模型的特点和适用环境,在此基础上结合良性蠕虫的特点提出.了良性蠕虫对抗恶性蠕虫的传播模型。经过比较和分析,理论上证明了蠕虫对抗蠕虫传播模型,有效地补充和改进了传统的Internet蠕虫传播模型,使其更符合Internet蠕虫传播的实际,为进一步研究蠕虫的检测与预防提供了有力的研究方法。与现有模型相比,其降低了对抗蠕虫给网络造成的冲击、可控,并降低了模型的复杂度。  相似文献   

2.
廖明涛  张德运  侯琳 《计算机工程》2006,32(15):22-24,3
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。  相似文献   

3.
当前网络蠕虫对Internet构成重要威胁,如何防范蠕虫已经成为网络安全的重要课题。由于蠕虫传播速度快、规模大,因此必须在蠕虫传播初期就能发现并采取相应措施进行隔离。本文首先介绍了蠕虫的相关概念,然后详细介绍了当前蠕虫的防御和清除方法。  相似文献   

4.
根据网络蠕虫攻击的特点,建立了能够反映蠕虫扫描特征的失败连接流量(FCT)时间序列,提出了一种基于FCT时间序列小波包能量特征和支持向量机(SVM)的蠕虫检测新方法。该方法利用小波包分析计算FCT时间序列在各频带投影序列的能量分布,获得能够表征蠕虫扫描的特征向量,使用经过样本训练的SVM分类器进行分类,实现蠕虫攻击扫描的自动检测。实验结果表明,该方法能够比较准确地检测蠕虫攻击,和理论值相比,漏报率低于6%,误报率低于1%。  相似文献   

5.
当前网络蠕虫对Internet构成重要威胁,如何防范蠕虫已经成为网络安全的重要课题。由于蠕虫传播速度快、规模大,因此必须在蠕虫传播初期就能发现并对其采取相应措施进行隔离。全面分析了蠕虫预警方面的最新研究进展,包括路由器级的蠕虫检测、基于行为的蠕虫检测、蠕虫特征的自动提取,并对蠕虫的特点进行了总结,最后对未来蠕虫检测的可能方向进行了展望。  相似文献   

6.
王炜    罗代升  王欣  方勇 《计算机工程》2007,33(16):104-105,108
分析了现有对抗代码的结构和不足,提出一种新的蠕虫主动对抗代码结构和实现方法,通过与Blaster, Nachi, Sasser等实际蠕虫的实验对比,证明了该结构和生成方法的有效性。它能减少代码长度,避免交互和额外下载,显著提高对抗代码发布速度,减少网络负担,提高发布效率达2倍~3倍,可用在良性蠕虫、蠕虫疫苗等主动对抗措施中。  相似文献   

7.
秦燊  劳翠金 《计算机工程》2012,38(9):153-154,176
大多数多态蠕虫特征提取方法不能很好地处理噪音,提取出的蠕虫特征无法对多态蠕虫进行有效检测。为此,提出一种改进的多态蠕虫特征提取算法。采用Gibbs算法从包含n条序列(包括k条蠕虫序列)的可疑流量池中提取出蠕虫特征,在识别蠕虫序列的过程中基于color coding技术提高算法的运行效率。仿真实验结果表明,该算法能够减少时间和空间开销,即使可疑池中存在噪音,也能有效地提取多态蠕虫。  相似文献   

8.
基于AOI方法的未知蠕虫特征自动发现算法研究   总被引:3,自引:0,他引:3  
近年来频繁爆发的大规模网络蠕虫对Internet的整体安全构成了巨大的威胁,新的变种仍在不断出现。由于无法事先得到未知蠕虫的特征,传统的基于特征的入侵检测机制已经失效。目前蠕虫监测的一般做法是在侦测到网络异常后由人工捕获并进行特征的分析,再将特征加入高速检测引擎进行监测。本文提出了一种新的基于面向属性归纳(AOI)方法的未知蠕虫特征自动提取方法。该算法在可疑蠕虫源定位的基础上进行频繁特征的自动提取,能够在爆发的早期检测到蠕虫的特征,进而通过控制台特征关联监测未知蠕虫的发展趋势。实验证明该方法是可行而且有效的。  相似文献   

9.
当今是网络技术普及化的时代.但网络技术和计算机技术的发展给网络带来的负面影响也是明显的。目前对网络威胁最大的是木马和蠕虫。蠕虫的攻击给网络用户带来了巨大损失,也给他们留下了深刻印象。因此,蠕虫对网络的破坏性,引起安全人员的重视,安全人员对防治蠕虫提出了各种算法。在查阅相关蠕虫文献后,提出了一种遏制网络蠕虫传播的思路。简述了蠕虫的传播方式和途径,病毒传染机理和病毒破坏机理,提出了如何从寄生于蠕虫的程序,有效防止蠕虫的传播和减小蠕虫的传播范围。  相似文献   

10.
蠕虫在网络中传播速度快,产生的危害大,如能及时检测到蠕虫入侵,则可减少很多损失。针对蠕虫的入侵模式,文章提出了一种蠕虫预警方法,并设计了一个预警系统模型,以检验该方法的有效性,实验结果表明这种方法能够比较有效地检测蠕虫的早期入侵。  相似文献   

11.
Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.  相似文献   

12.
European Community policy and the market   总被引:1,自引:0,他引:1  
Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.  相似文献   

13.
融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。  相似文献   

14.
Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.  相似文献   

15.
This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.  相似文献   

16.
Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008  相似文献   

17.
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.  相似文献   

18.
Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.  相似文献   

19.
《计算机科学》2007,34(4):148-148
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.  相似文献   

20.
This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)SM and Team Software Process (TSP){SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.  相似文献   

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