基于JAVA技术的MD5加密算法的设计与实现

详细描述了在数字签名、电子商务、信息加密领域中广泛应用的MD5加密算法,并针对其高效、跨平台使用,提出利用JSP与JavaBean相结合的技术方法实现MD5加密算法.该方法采用Java语言实现MD5算法,并利用JavaBean组件进行封装,通过JSP技术进行相应页面的动态展现,既简化JSP网页结构体现了Java体系的技术优势,又保证了应用系统的安全性、跨平台性和提高系统的执行效率.     

电子商务中两种支付模式的研究与分析

电子商务中网上支付安全性是电子商务交易中关键之所在.本文通过对当前电子商务中主要流行的网上支付交易模式的研究,进一步比较分析他们在购物过程中的安全性.针对网上支付交易中存在的安全问题,提出了加强网上购物过程安全性的建议.     

Hash签名在电子商务中的应用研究

数字签名是一项应用于电子商务领域的安全技术.全面分析研究了Hash签名方法及MD5算法,并对Hash签名的优势与局限性进行了总结,指出只有构造出更安全的加密算法才能适应电子商务发展的安全需要.     

基于MD5和数字水印的电子签章文件校验方案

随着电子商务和电子政务的发展,为了保证其应用中文件的安全,根据数字水印的鲁棒性、脆弱性,以及Hash、COM组件等技术,提出了一种基于MD5和数字水印的电子签章文件校验方案.实现了文档的防篡改、文档的合法性验证.     

她是破解国际两大"密码"的中国第一人--访山东大学信息安全研究所所长、教授王小云

随着电子商务的发展,网上银行、网上合同、电子签名等的应用越来越广泛,网络已经成为我们生活中不可缺少的一部分,在我们的生活中担当着一个重要的角色。然而,当电子商务给我们的工作、生活带来便捷的同时,也不可避免地存在着安全隐患。一直在国际上广泛应用的两大密码算法MD5、SHA-1,宣布被一名中国密码专家破解了!这一消息在国际社会尤其是国际密码学领域引起了不小的震动,也同时再次敲响了电子商务安全的警钟……她是谁呢?她便是生活在我们身边、山东大学的王小云教授!她成为成功破解一直在国际上被广泛应用的两大密码算法MD5、SHA-1的第一人,这在国际社会尤其是国际密码学界引起了轩然大波!山东大学王小云教授带领的密码研究小组在国家自然科学基金“网络与信息安全”重大研究计划的资金支持下,经过一年多的研究,先后破译了包含MD5与SHA-1在内的系列Hash函数算法。其中MD5由国际著名密码学家图灵奖获得者兼RSA的第一设计者Rivest设计,SHA-1由美国标准技术所NIST与美国国家安全局NSA设计的Hash函数标准算法。两大算法是目前国际电子签名及许多其它密码应用的关键技术。让我们走近她,去仔细谛听;去用心感悟……     

基于公钥的PGP安全性研究

从使用的IDEA、RSA、MD5随机数生成器几种算法的安全性能入手，研究了PGP的安全性。提出了解决PGP安全中薄弱环节的办法。     

从MD4衍生的HASH函数解析

HASH函数MD4的设计是不基于任何假设和密码体制的，为了增强MD4的安全性和抗攻击程度，由MD4衍生出多种HASH函数如MD5、SHA-1、RIPEMD-160等，讨论了由MD4函数衍生出的MD5、SHA-1、RIPEMD-160算法设计及其安全性，比较分析各函数的相同与不同点．     

计算机安全技术在电子商务中的应用

伴随因特网的飞速发展,电子商务正得到越来越广泛的应用。电子商务的安全性是影响其成败的一个关健因素。从电子商务系统对计算机网络安全,商务交易安全性出发,本文结合分析了当前电子商务面临的安全问题,介绍利用网络安全技术解决安全问题的方法.其中阐述数据加密技术、身份识别技术、智能化防火墙技术。     

数字签名技术在电子商务安全中的应用研究

随着电子商务迅猛发展,商务安全已成为一个非常突出的问题,在一定程度上制约电子商务的发展.在电子商务系统中引入数字签名技术,提出基于数字签名技术的电子商务安全解决方案,实现电子商务系统中信息传递的有效性、安全性和不可抵赖性等问题,有效防止了各种电子商务中的安全隐患.     

MD5报文摘要算法的研究与实现

在信息加密中,采用报文摘要的方法不但可以节省加密时间,还可以节省报文传输和存储的开销。在目前提出多种报文摘要中,应用最广的就是MD5。本文针对MD5报文摘要算法进行了深入研究,分析了算法的安全性,通过程序开发对算法进行了实现,总结了MD5加密算法的应用。     

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.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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