Windows加密文件系统核心技术分析

加密文件系统（Enerypt File System，EFS）提供了一种核心文件加密技术，该技术用于NTFS文件系统卷上存储已加密文件。EFS采用高级的标准加密算法实现透明的文件加密和解密，任何不拥有合适密钥的个人或者程序都不能读取加密数据。文章对EFS核心技术进行了较为深入的分析并指出了EFS的不足。     

了解EFS加密及解密

Windows 2000/XP/Server 2003都配备了EFS（Encrypting File System，加密文件系统），它可以帮助您针对存储在NTFS磁盘卷上的文件和文件夹执行加密操作。如果硬盘上的文件已经使用了EFS进行加密，即使墨客能访问到你硬盘上的文件，由于没有解密的密钥，文件也是不可用的。     

使用EFS对你电脑上的脱机文件加密

Windows 2000引入了EFS（加密文件系统）和脱机文件。EFS允许用户在NTFS分区上对文件和文件夹进行加密。如果用户的电脑断开与网络或服务器的连接。可以通过脱件文件像通常一样继续处理未完成的文件。在Windows XP专业版中。具有计算机管理员权限的用户可以对脱机文件进行加密。下面就让我们去看看怎样对存储在本地磁盘上的高速缓冲存储器中的脱机文件进行加密。[编者按]     

浅析Windows XP中的EFS加密技术

随着计算机应用技术的普及，数据安全变得越来越重要。EFS是NTFS（5．0）文件系统的独有特点，使用它可以实现文件和文件夹的加密、解密和恢复代理等操作，从而保障计算机数据的安全性。     

为EFS配置数据恢复代理

在基于Windows 2000/XP/2003的计算机中，如果系统中磁盘分区的文件系统格式采用了NTFS5.0，那么我们就可以利用文件加密系统（EFS）特性来保护用户保存在计算机中的个人文件的敏感信息，EFS采用了工业标准的数据加密算法和公钥加密系统对文件的内容进行加密，加密过程十分复杂，加密强度很大，安全性极高。     

基于Windows 2000下EFS加解密方法探讨

通过文件加密保护计算机数据安全是一种很有效的技术方法。EFS（Encrypting File System）加密文件系统是Windows 2000操作系统所具有的一个实用功能,充分利用EFS加密数据是一个不错之举。对EFS加密原理、EFS加密特性、功能进行了介绍,对EFS解密方法做了深入的探讨。     

EFS加密解密之谜

EFS（Encrypting File System）是加密文件系统的缩写．它是NTFS文件系统下的一种非常有效的加密方法。笔者就有很多朋友．因为重新安装了操作系统或误删除某个帐户而导致打不开EFS加密的文件央和文件。既是使用相同的添加相同的帐户名．也无济于事．那么对于一些重要的文件。我们真的束手无策了吗？请看本文……[编者按]     

新加密文件系统的研究与实现

为了解决Windows系统中文件加密存储的难题,分析了Windows EFS系统的不足,深入研究了过滤驱动开发过程中对IRP的处理、文件状态跟踪、避免重入等关键技术,使用文件过滤驱动技术,设计并实现了一个新的加密文件系统.该系统对用户完全透明,可以根据用户的策略对指定文件、文件夹或者某一类型文件进行加密存储,支持NTFS、FAT等多种文件系统,加密算法可以更改.实验结果表明,该系统性能良好且在功能和应用上都扩充了Windows EFS.     

基于NTFS的文件加密系统

NTFS提供了一种称为加密文件系统的功能,这和功能使用户可以对自己的文件进行加密,以防止其内容暴露作入侵者面前。用户在使用这个功能的过程中,一方面会遇到自己加密的文件无法恢复的情况,另一方面是自己加密的文件被入侵者窃取,并查看其内容。本文讨论了文件加密的概念,加密解密过程,使用教程中的常见问题以及加密文件系统的安全性。     

FileVault2加密分区离线解密技术及其取证应用

苹果公司推出OS X 10.3（Panther）系统时,引入了FileVault磁盘加密功能。在最新发布的OS X Lion 系统中,引入了全新加密方式FileVault2。FileVault2使用全磁盘、AES-XTS 128加密来帮助保护数据安全。针对当前大部分的取证软件都不支持对经过FileVault2加密的磁盘进行数据解析问题,文章首先讨论了FileVault2的加密原理,接着提出了离线解密的方法,并在此基础上设计了FileVault2取证工具,使得加密磁盘摆脱了目标数据源对Mac OS系统的依赖,能够在没有Mac OS系统的环境下对经过FileVault2加密的磁盘进行取证。实践表明此离线解密方法丰富了加密数据的取证项。     

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。     

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.     

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.     

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     

Explanation and prediction: an architecture for default and abductive reasoning

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.     

Three Process Perspectives: Organizations, Teams, and People

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.     

基于复小波噪声方差显著修正的SAR图像去噪

提出了一种基于复小波域统计建模与噪声方差估计显著性修正相结合的合成孔径雷达(Synthetic Aperture Radar,SAR)图像斑点噪声滤波方法。该方法首先通过对数变换将乘性噪声模型转化为加性噪声模型,然后对变换后的图像进行双树复小波变换(Dualtree Complex Wavelet Transform,DCWT),并对复数小波系数的统计分布进行建模。在此先验分布的基础上,通过运用贝叶斯估计方法从含噪系数中恢复原始系数,达到滤除噪声的目的。实验结果表明该方法在去除噪声的同时保留了图像的细节信息,取得了很好的降噪效果。     

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。