RAS算法在VFP中数字签名的实现

VFP(Visual Foxpro)是现在使用比较广泛的数据库软件之一,数据签名可以实现签名认证,但是在VFP中实现数字签名的方法却很少.提出了RSA非对称密钥算法在VFP中实现数字签名的方法,简单介绍了公钥密码体制,描述了RSA算法实现数字签名的原理、数字签名的原理和Hash函数,介绍了在VFP中产生大素数和公开密钥的方法,详细描述了私有密钥的生成过程,提出了在数据表中提取摘要的一种简单方法,用流程图的方式描述了数字签名在VFP中实现签名验证过程.最后给出RAS数字签名在VFP中的实现界面图.     

数字签名实施方案的探讨

文章经过对基于对称密钥的数字签名和非对称密钥的数字签名的研究，提出了一种新的数字签名实施方案，它能很好地解决上面两种方法中存在的弊端。     

任意数量托管者的密钥托管方案

在已有的密钥托管方案中,包括门限方案,均要求在恢复密钥时所必须的托管者数量是一定的,但基于椭圆曲线和椭圆曲线数字签名的托管者数量可以是任意的密钥托管方案,且具有防欺诈功能.     

非对称RSA算法用于数据加密的相关技术探讨

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,从一个公开密钥和密文中恢复出明文的难度等价于两个大素数相乘后,再将两素数从乘积中分解开来.除加密功能外,RSA系统还可以利用公共密钥和专用密钥两对密钥,提供指纹式数字签名.     

公共密钥密码体制在数字签名中的应用

数字签名机制是保证信息安全的一种重要方法 .简单介绍了公共密钥密码体制在数字签名中的应用 ,特别是集体全签名问题 .为了防止公钥被伪造、篡改 ,讨论了认证机制     

改进的数字签名方案在电子档案数据安全中的应用研究

在使用RSA进行数字签名的基础上,引入门限方案的秘密共享思想,提出一种改进的防欺诈数字签名方案,通过对数字签名中安全性要求极高的签名密钥进行处理,保证了电子档案数据的安全性。     

基于椭圆曲线数字签名的软件加壳保护技术的实现

结合软件加壳、脱壳技术,提出了一种基于椭圆曲线数字签名算法的软件保护方案,并用JBuilder语言实现其基本功能.该方案的安全性不寓于算法本身,只要密钥不被泄漏,破解者无法根据算法和公钥生成新的私钥,因此具有很好的安全性和有效性.     

RSA的加密算法与安全性浅析

在现代密码体系中,RSA被认为是保密性能好的一种密钥体系,既能用于数据加密也能用于数字签名,它的安全性依赖于大素数因数分解的困难性.文章重点介绍RSA的加密算法理论,密钥的算法原理、具体如何实现加密与解密,以及分析它的安全性问题.     

XML数字签名浅析

数字签名是以数字代表身份,对电子文档进行签名,以确保其完整性、可靠性和有效性的一种机制.XML数字签名集安全性与灵活性于一体,打破了传统数字签名的局限,不仅可以保证信息的完整性、真实性和不可否认性,还可以提高数据的扩展性和互操作性.这里介绍了数字签名、XML数字签名以及XML数字签名分类和XML数字签名的生成和验证过程,并对XML数字签名的类型进行综合改进.     

信息安全与密码

"信息安全与密码"是《普通高中数学课程标准(实验)》中选修系列3中的专题之一.文中介绍了密码学中的基本概念(如明文、密文、密钥、加/解密等)和通讯中的基本问题(如密钥管理和数字签名等),同时简要介绍了流密码、RSA密码体制、Diffie-Hellman密钥交换协议和ElGamal算法.供高中数学教师开设此专题讲座时参考.     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…     

库克斯顿城堡

城堡, 是欧洲典型的建筑之一, 每个城堡都有一个美丽的传说或是一段历史。从本期开始, 我们将推出“城堡之旅”, 带各位读者去浏览、观赏欧洲各地的城堡, 开始一段文化与历史的旅途!     

胡主席在印度,我却在中国

Today, Sunday morning, I sit thinking and typing at my computer. My thoughts are in my homeland, India and my body is in China. The body is here and mind there for a good reason. Mr. Hu is president and I am resident and both are in each other's countries (what a difference the absence of one small letter makes!). Mr. Hu will return in a few days and I will stay on longer.