基于磁盘数据分析的Bootkit静态检测研究与实现

Bootkit这种新型恶意代码通过感染磁盘的主引导记录(MBR)或卷引导记录(VBR)来获取执行权,从而将加载时间大大提前以使常规基于动态行为分析的安全软件都不能对其进行有效检测[1]。针对Bootkit检测这一难题提出一种新型静态检测方法,设计实现相关的MBR匹配算法,并针对国内外知名的Bootkit恶意代码样本进行实验。实验结果显示此方法可以有效检测出当今主流的Bootkit恶意代码,进而证明了静态检测思路的可行性。     

基于导入表迁移的PE文件信息隐藏技术研究

在分析PE文件导入表结构的基础上,利用Windows加载器的工作原理和PE文件导入表存储位置不确定性的特点,提出了一种迁移PE文件导入表并将信息隐藏在PE文件原导入表位置的信息隐藏算法。理论分析与实验结果表明,该算法较好地弥补了传统PE文件信息隐藏算法中隐藏信息过于集中、交换PE文件导入表数据结构元素将破坏隐藏信息的不足,提高了隐蔽性和抗攻击性。     

决策树方法在恶意DLL文件检测中的应用

本文对现有恶意DLL文件注入技术和PE结构进行了分析,提出了一种检测恶意DLL文件的新方法。通过分析DLL文件的文件属性和PE文件字段值,利用决策树方法中的C4.5算法构造恶意DLL文件检测模型,并且通过实验验证该检测模型的检测效率。     

基于多级签名匹配算法的Android恶意应用检测*

针对Android恶意应用泛滥的问题,提出了一种基于恶意应用样本库的多级签名匹配算法来进行Android恶意应用的检测。以MD5哈希算法与反编译生成的smali文件为基础,生成API签名、Method签名、Class签名、APK签名。利用生成的签名信息,从每一类恶意应用样本库中提取出这类恶意行为的共有签名,通过匹配待检测应用的Class签名与已知恶意应用样本库的签名,将待测应用中含有与恶意签名的列为可疑应用,并回溯定位其恶意代码,确定其是否含有恶意行为。在测试中成功的发现可疑应用并定位了恶意代码,证明了本系统的有效性。     

基于PE文件资源数据的信息隐藏方案

研究PE图标和位图资源存储格式及其特点,提出基于PE资源数据的信息隐藏方案。该方案利用PE文件的隐蔽性,采用有效的信息隐藏算法将秘密信息嵌入到PE资源数据中,提高信息隐藏的安全性和隐藏容量。针对PE图标和位图特点,提出一种新的调色板冗余颜色分配算法,提高基于调色板颜色冗余隐藏算法的嵌入量。     

针对插入攻击型Bootkit的分析及检测

通过分析Bootkit采用的关键技术,研究目前已有Bootkit样本的工作原理,给出插入攻击型Bootkit形式化描述,建立一个通用的插入攻击型Bootkit模型.针对该模型建立了Bootkit检测模型,并在检测模型基础上提出新的检测算法.新算法不仅能检测目前已有的样本,而且适用于所有符合插入攻击型Bootkit模型的未知Bootkit.最后对该检测算法进行了测试,实验结果表明,提出的算法可对Windows平台上的多款基于NT内核的Bootkit实现有效检测,同时能够确定Bootkit的类型.     

Windows环境下隐秘磁盘的设计与实现

在Windows下创建一个虚拟磁盘,将数据加密后隐藏在文件中。向虚拟磁盘写入数据时,驱动程序使用口令的SHA-1哈希值作为加密密钥,用AES算法加密数据后,密文隐藏在WAV声音文件的16位采样值中的最低4位。和BMP图像文件相比,采用WAV文件作为载体提高了磁盘I/O操作的性能。PESQ测试验证了隐藏数据后声音的音质基本保持不变。     

一种基于PE文件的信息隐藏方法的研究与实现

通过研究PE文件的格式,分析了目前存在的冗余空间进行信息隐藏的不足,利用PE文件资源结构提出一种基于PE文件的信息隐藏方法,通过将信息隐藏于PE文件资源节中,隐藏后PE文件的大小没有改变,而且也不破坏原PE文件的执行,最终达到将信息分散隐藏的目的,提高信息的隐蔽性.     

面向PE病毒检测的行为特征分析方法研究

目前,计算机病毒的存在成为了信息安全的一大威胁,其中以Windows32 PE文件为感染目标的PE病毒最为盛行,功能最强,分析难度也最大。对此,本文研究了一种面向PE病毒检测的行为特征分析方法,详细分析PE病毒执行过程中的关键行为特征、一般行为特征等,并以其十六进制行为字符串特征码作为PE病毒的检测依据,通过对可疑PE文件中字符串的匹配实现PE病毒的启发式检测。     

基于增量链接的PE文件信息隐藏技术研究

增量链接旨在提高编译速度和方便程序调试。通过分析采用增量链接后生成的PE文件的特点,提出了一种基于编译器增量链接特性的信息隐藏算法。该方案将隐秘信息隐藏在两个相邻函数代码之间的填充字节中,使得隐藏的信息与程序指令代码紧密结合在一起,极大地提高了隐蔽性和杭攻击性。实验结果表明:该算法隐藏容量大,隐藏信息后的PE文件的长度不会增加,程序性能不受影响,隐蔽性好。     

Only connect: teaching, technology and telesis

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.     

European Community policy and the market

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.     

一种自适应子融合集成多分类器方法

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。     

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.     

Avoiding semantic and temporal gaps in developing software intensive systems

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.     

基于QTE的蒙古文显示机制研究与实现

蒙古语言是中国蒙古族使用的通用语言,由于蒙古文区别于其他文字的书写方式和其自身变形机制等特点,在很多通用的文字处理引擎中都不被支持。在嵌入式产品开发与应用领域中Linux加QTE已经成为流行方式。该文给出了一种在QTE环境上实现基于标准Unicode的蒙古文点阵显示和变形算法, 并自定义了支持蒙古文的QTE组件,扩展了QTE功能,为在Linux加QTE方式的嵌入式体系结构中处理蒙古文提供了一种解决方法。     

Designing economic np control charts: A programmed simulation approach

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.     

基于AD9626的模拟信号采集存储卡设计

自然界的绝大部分信号都是以模拟的形式存在,因此模拟信号的采集转换存储在数字时代十分关键。文章讨论了在雷达信号处理领域基于AD9626的AD采集存储卡的设计原理、硬件结构和程序设计与芯片配置等问题,为今后相关领域的研究提供了可参考的方案。     

The development of robot art

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     

A human-computer interface for non-computer specialists

The COM teleconferencing system was designed to be easy to use for both beginners and people with much computer experience. A number of design choices in organizing the human-computer interface were considered very carefully. These design problems are not unique for teleconferencing applications, but will appear in many other developments of human-computer interfaces for non-computer specialists. This report discusses naming conventions, menu format, user commands, help facility and the treatment of ‘type ahead’ from the users.