RSA公钥密码体制在数字签名中的应用

RSA的安全基于大数分解的难度,其公开密钥和私人密钥是一对大素数的函数,从一个公开密钥和密文中恢复出明文的难度等价于分解两个大素数之积.鉴于这种特性,利用RSA公钥密码体制可在电子商务中实现数据的加密和数字签名.文中介绍了RSA体制的算法过程及RSA体制在加密和数字签名中的应用,分析了RSA实现的效率和安全性.由此可见,RSA体制能很好地实现数字签名的功能,并得到了广泛应用.     

用RSA实现电子商务系统中的数字签名

安全性、易用性与加解密的效率是建构PKI客户端系统的重要内容。这些问题与密钥的管理、加密的硬件实现有关。RSA的安全基于大数分解的难度,其公开密钥和私人密钥是一对大素数的函数,从一个公开密钥和密文中恢复出明文的难度等价于分解两个大素数之积。鉴于这种特性,利用RSA公钥密码体制可在电子商务中实现数据的加密和数字签名。文中介绍了RSA体制的算法过程及RSA体制在加密和数字签名中的应用,分析了RSA实现的效率和安全性。     

用RSA实现电子商务系统中的数字签名

安全性、易用性与加解密的效率是建构PKI客户端系统的重要内容。这些问题与密钥的管理、加密的硬件实现有关。RSA的安全基于大数分解的难度,其公开密钥和私人密钥是一对大素数的函数,从一个公开密钥和密文中恢复出明文的难度等价于分解两个大素数之积。鉴于这种特性,利用RSA公钥密码体制可在电子商务中实现数据的加密和数字签名。文中介绍了RSA体制的算法过程及RSA体制在加密和数字签名中的应用,分析了RSA实现的效率和安全性。     

基于RSA的网络安全及其在评估系统中的应用研究

RSA算法是一种公开密钥算法,它的安全系数取决于大素数分解的难度。其公开密钥和私人密钥是一对大素数(100到200个十进制数或更大)的函数。从一个公开密钥和密文中恢复出明文的难度等价于分解两个大素数之积。该文研究了RSA算法的实现过程,并对其中的一些重要步骤进行了详细的讨论。最后,实现了RSA算法在房地产评估系统中的应用。     

RSA密码分析中分解大整数的判定算法

RSA的安全性是依据大整数分解的困难性而设计的。在RSA的密码分析中,根据RSA公钥加密体制中的公开密钥n为2个大素数乘积的特性,针对形如n=pq(其中,p、q为大素数)的大整数n分解,提出一种分解n的判定算法,并对n的素因子特征与该算法的有效性关系进行分析。经过数学证明和相应算法设计证实,该算法的复杂度低于O(plogn)。     

RSA算法的一种快速软件实现

RSA算法是基于数论的公开密钥密码体制。RSA算法已经成为现在最流行的公钥加密算法和数字签名算法之一。RSA算法的加密、解密操作要进行十进制位数达百位以上的大数运算，实现难度大，运算时间长。而影响其运算速度的主要因素是大数乘幂算法和取余算法。本文提出一种改进大数乘幂算法和取余算法，并加以实现，该算法可以提高RSA算法的运算速度。     

USB Key认证方式及其数学原理

USB Key认证方式是目前应用较多的认证方式。它的理论基础是公开密钥密码体制，公开密钥密码体制的基础是单向陷门函数。求两个大素数的乘积是典型的单向陷门函数，它是RSA算法的核心，构建了数字签名的数学基础。     

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。     

RSA算法的一种实现以及在CAS中的应用

为解决数据信息交换过程中的安全问题,在对RSA公开密钥加密算法数学原理进行描述的基础上,给出了利用Solovay-Strassen概率算法生成素数的一种实现方法,用本方法进行的素数测试,可以达到较快的运行速度。讨论了RSA算法在数字电视CAS中的应用,RSA算法会使其加密体制更安全、更有效。     

RSA加密体制的密钥生成技术的研究

RSA是一种非对称加密算法,在公钥加密标准和电子商业中被广泛应用.RSA的可靠性基于大整数的分解难度.事实证明,因子分解的难度随着密钥长度的增加而增加.本文讨论密钥长度为1000位以上密钥生成技术,这种技术主要涉及通过素性检测生成一个大素数.运用Rabin-Miller算法检测素数,并在成功生成两个大素数之后,运用欧几里德算法在默认公钥的前提下求得私钥,然后就可运用公钥和私钥进行加密与解密了.     

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     

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.     

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。