AES算法的分析与实现

Rijndael算法是美国21世纪先进加密标准（AES）。文中介绍了AES算法的基本结构及其加解密的流程;在此基础上,使用VC＋＋6．0编程实现了192位的AES加解密算法,并对其加解密结果进行充分验证,收到良好效果。     

基于AES与RSA的BLE门禁管理系统的数据加密

针对AES密钥管理中存在的安全性不高和RSA不适合大数据量加/解密的缺陷,为保障用户的敏感信息以及BLE门禁设备的重要数据,本文提出了采用AES与RSA混合的加密体制。利用AES算法来加/解密敏感数据,RSA算法来加/解密AES算法的密钥。然后,采用DBMS外层加密方式和字段级的加密粒度,在BLE门禁管理系统中实现对"敏感数据"的加/解密处理,以及混合加密体制下密钥的管理,保证了数据的安全性与可靠性。     

数据库的加解密操作

FOXPRO数据库系统没有直接提供对数据库文件的加解密操作,而有时为了数据的安全可靠,应该对数据库文件加密和解密.由于FOXPRO系统提供了对文件进行低层操作的函数,本人利用FOXPRO系统这一功能编制对数据库文件的加密和解密程序.文中提供的加解密算法比较简单,只是表达一个加解密的思想,但是却非常实用.本人多次在编程过程中利用此程序对数据库文件进行加解密操作,基     

利用组合加解密方案改进SETA协议的研究

文章首先对电子商务的安全体系进行了分析，针对SET协议对加解密算法的限制，提出了一种采用组合加解密方案来提高SET协议的适应性和安全性，同时，又给出多证书和多数字签名的生成和认证方法。     

WLAN数据加密技术中AES算法的分析与改进

分析了wLAN安全标准IEEE8021li中使用的AES数据加密算法,重点解析了AES算法中的SubBytes、ShiftRows、MixColunms和AddRoundKey个操作。同时针对AES算法密钥数量多、管理效率不高的缺点,采用AES与ECC混合加密机制,通过ECC算法来实现对AES密钥的加解密,从而提高7WLAN安全性中数据加解密的效率和性能。     

WLAN数据加密技术中AES算法的分析与改进

分析了WLAN安全标准IEEE802.11i中使用的AES数据加密算法,重点解析了AES算法中的SubBytes、ShiftRows、Mix-Columns和AddRoundKey四个操作。同时针对AES算法密钥数量多、管理效率不高的缺点,采用AES与ECC混合加密机制,通过ECC算法来实现对AES密钥的加解密,从而提高了WLAN安全性中数据加解密的效率和性能。     

Beller-Yacobi协议的研究与模拟实现

本文着重分析了Beller-Yacobi协议及以其中用到的RSA加解密及签名算法,并以RSA加解密算法为例在.NET环境下使用C#语言模拟实现了其详细过程,最终实现了整个Beller-Yacobi密钥传输协议的过程。     

基于FPGA的AES加/解密算法的可重构设计

高级加密标准(AES)的传统实现方法是对加/解密算法进行单独设计,占用了过多的硬件资源。该文在分析AES加/解密算法机理的基础上,介绍了算法各模块的设计方法,通过分析提取了加/解密算法之间存在的共性,给出算法的可重构设计实例。通过FPGA仿真验证,该方案与传统设计方案相比,减少了资源的消耗。     

截断Baker变换及其在数字图像加密中的应用

利用截断面包师变换对图像进行加解密。首先介绍了截断面包师变换定义及其性质；然后采用截断Baker变换对图像进行加密运算，将加密后的图像和密钥分别从公共通道和密钥通道传输，解密算法是加密算法的逆过程。试验结果表明，截断面包师变换具有很好的统计特性，该算法能够得到令人满意的结果。     

基于计算机网络的随圆曲线加密系统的硬件设计与实现

文章根据作者的实际开发过程,提出了一种切实可行的基于计算机网络的椭圆曲线加密系统。内容包括椭圆密码体制的选择、有效算法的设计和快速加、解密的硬件实现。并且详细阐述了利用多片数字信号处理器TMS320C50在微机上实现并行椭圆曲线加、解密系统的方法。     

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。     

How do children do mathematics with LOGO?

Abstract  This paper considers some results of a study designed to investigate the kinds of mathematical activity undertaken by children (aged between 8 and 11) as they learned to program in LOGO. A model of learning modes is proposed, which attempts to describe the ways in which children used and acquired understanding of the programming/mathematical concepts involved. The remainder of the paper is concerned with discussing the validity and limitations of the model, and its implications for further research and curriculum development.