基于Triple DES与RSA的文件加密系统

比较对称密码体制与非对称密码体制的特点,简述Triple DES算法与RSA算法的基本原理。在详细分析文件安全的相关问题和深入研究.NET Framework密码算法类的基础上,提出Triple DES算法与RSA算法结合运用的文件加密方案,设计系统的总体结构和基本流程,并以VB.NET实现了基于Triple DES与RSA的文件加密系统。实践表明,用本系统进行文件加密简单而方便。     

RSA算法安全性分析

网络系统最主要的安全技术是数据加密,而RSA算法是密钥系统最安全的一种体制,其算法的安全性基于数论中大素数分解的困难性。该文首先介绍RSA公开密钥加密算法数学原理,并讨论RSA算法固有缺陷,最后分析RSA算法的安全性。     

基于RSA数字信封技术的Android数据安全机制

文章分析了当前手机领域面临的安全问题和Android系统在安全性方面的不足,根据现有的数字认证技术和RSA算法,提出了一种基于RSA数字信封技术的Android系统数据安全机制。该方案实现了对Android系统的安全认证和数据加密,有效提高了Android系统的数据安全性。     

非接触式支付系统中安全机制的改进

深入介绍了非接触式支付系统中所采用的安全机制,通过对RSA算法和ECC算法比较和分析,提出在非接触式支付系统中采用ECC算法代替RSA算法的可行性。     

DSP和RSA密码体制在电子商务中的应用

提出了一种采用DSP作为主处理器实现RSA算法的嵌入式快速加解密及数字签名系统的解决方案。RSA算法是目前已知的最为安全的算法之一,但在软件环境下实现速度慢,很难满足现实应用的需要。TI公司的DSP性能特征能很好地满足RSA运算的需要,能很好地解决RSA的快速实现问题。     

C3I系统信息加密技术研究

对C^3I系统的信息安全性进行了分析，讨论了安全体系结构及数据保密的实现途径，建立了C^3I系统的安全模型，综合使用IDEA类算法、RSA相关算法、HAVAL杂凑算法设计了一个C^3I数据加密系统。     

基于RSA的安全应用及漏洞分析

目前,公钥密码系统在网络安全中的应用越来越广泛,尤其在典型代表RSA系统得到大量使用。将系统地介绍和阐述RSA公钥密码系统的基本原理,介绍目前在计算机网络安全领域的几类基本应用,并针对其设置和应用的漏洞分析,提出安全应用RSA的参数选取和避免攻击的解决办法,最后还探讨了RSA的发展趋势。     

不停车收费系统信息加密

论述了RSA加密算法的过程,分析了算法中素数测试、密钥产生和现阶段的安全性。剖析了不停车收费系统中存在的数据安全问题,选择RSA加密算法对系统中使用的AES密钥进行加密并通过语言实现。     

RSA算法的改进

RSA加密算法现在是一个在互联网上、银行系统、军事系统等等许多领域用处相当广泛的加密算法之一,已经深深的影响到互联网上的每一个人。极大的保证了交易的安全性,一组以RSA算法产生的密码是需要当前世界上所有电脑联机不断的工作二十五年才能够破解的,这个足以说明他的价值之大,用处之广泛。本文根据RSA算法的优缺点,提出了一种以小数相乘的计算效率大于大数相乘的思想为基础RSA算法的改进算法,并对改进算法的可行性和效率进行了说明。     

基于PKI安全体系的在线考试系统研究

针对现行在线考试系统的安全问题,引入PKI安全体系,设计了基于PKI安全体系,MD5、RSA、CPRS三重加密保护的在线考试系统,主要结构较基本考试系统增加了CA、RA、证书管理机构、加解密模块等,实现了高效安全的在线考试系统。     

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.