基于AutoCAD的工程图纸可视化数字签名

数字化图纸是产品全生命周期过程中不断被传递的重要数据文件,安全有效地传递、存储、管理工程图纸成为数字化设计制造过程中需要解决的关键技术问题.探讨了将数字加密签名技术和CAD文件结合起来,通过在CAD软件中嵌入加密签名组件的方法,实现了在AutoCAD环境下的可视数字签名,使普通CAD文件变成具有安全属性的数字化图纸,为工程图文档管理或PDM提供了新的文件架构思路.     

地籍图图形数字化和计算机绘图系统研究

0 引言在建立地籍图图形数字化和计算机绘图系统过程中,本文主要研究解决了以下几个问题:(1)地籍图图形数字化;(2)Auto CAD绘图软件与高级语言的联接;(3)图命令文件的生成;(4)图纸的拼接。本系统的设计原则是,(1)图形数字化力求操作简单,特征码简单、全面,同时又能满足以后地籍图计算机管理的需要。(2)本系统具有一定的图纸管理功能,力求资料     

企业应用系统整合中的CAS单点登录技术

针对企业应用系统单点登录的需要,提出一种基于中央认证服务器(CAS)的单点登录技术方案.系统中,认证管理器通过责任链模式管理认证执行者,客户端浏览器与认证服务器之间采用HTTPS协议,认证服务器与平台应用服务器之间采用HTTP协议.在访问业务系统时,相关信息的传递均结合时间戳、关键信息加密签名和SSL加密通道技术.在自动认证完成后,业务系统可根据需要设定是否继续走安全套接层协议(SSL)加密通道,既保证单点登录过程中信息传递的保密性和真实性.又兼顾业务系统访问的安全与效率.     

XML数字签名在高校教务管理系统中的应用

作为高校数字化校园的一部分,教务管理系统正在由功能型向安全高效型转变.文中研究了在教务管理系统中利用XML数字签名取代原本需要手工签名的方法,给出了一个具体的创建证书、签名、验证的实现过程.     

用WSE实现Web服务的签名和加密

介绍了一种实现Web服务安全通信的方法,叙述了消息的签名和加密的实现过程.介绍了使用WSE来对Web服务的SOAP消息进行基于消息的签名和加密的实现方法;并给出了一个利用WSE实现Web服务签名和加密的说明性实例.     

文件加密传输系统的设计与JAVA实现

采用JAVA的TCP、UDP网络编程、多线程、I/O流、Swing、签名、加密工具等技术,设计并实现一个跨平台的文件加密传输系统,综合运用MD5、RSA、DES等密码技术对文件进行签名和加密,然后在网络上传输,确保文件能够安全可靠地到达接收方。该系统不仅可以发送和接收文件,对文件进行加密传输,还可以发送和接收即时消息,这使得用户在传输文件的同时还可以进行即时交流。     

具有关键字搜索性质的云存储加密方案

Dan_Boneh等人提出了具有关键词搜索性质的公钥加密方案,并且构造出了在随机预言模型下可证明安全的基于BDH困难问题的双线性映射对下的具体构造.本文给出了一个具有关键字搜索性质的高效云存储加密方案,而且在随机预言模型下可证明CCA-安全.该方案能够安全高效的管理云服务器中的加密文件,能够对已经加密的文件进行相等配对.构造方案能够在无安全信道环境中传输陷门Tw.     

一种无证书的公平交换协议

公平交换协议是电子商务活动的一种重要安全协议.基于无证书密码体制,首先设计了一种无证书的可验证加密签名方案;然后基于该可验证加密签名方案构建了一种无证书的公平交换协议.协议降低了密钥托管和证书管理的开销,且满足有效性、公平性、时限性和优化性.     

一种指定接收者椭圆曲线门限群签名加密方案

提出了一种指定接收者椭圆曲线门限群签名加密方案.该方案根据Nyberg和Rueppel方法,利用椭圆曲线加密技术将门限群签名与指定接收者公钥加密有机地结合在一起,构造一种指定接收者的门限签名群加密方案.与传统的消息加密再数字签名的方法相比,该方案具有数据传输安全、计算复杂度和通讯复杂度低、通讯带宽小等优点.     

论CAD电子文件归档管理的运行控制

在科研院所工程设计单位，设计生产的主要成果就是设计文件，随着新技术的推广和应用，CAD出图率已达100％。在实行“二套制”即CAD电子文件与图纸同时保存的单位，CAD电子文件的规范管理应该通过运行控制，实现科技档案纸质文件同CAD电子文件同时归档，保证纸质文件同CAD电子文件内容的一致性，确保CAD电子文件名同纸质文件保管单位号相一致，从而攻克CAD电子文件归档率低、真实性差、对应性差等课题，实现档案管理的历史性跨跃。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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