视觉密码在数字水印中的应用

文中利用视觉密码"一次一密"的特点,即安全又省时,将或运算和异或运算运用在视觉密码中.最终将视觉密码技术与数字水印技术相联接,使水印的植入过程、水印的提取过程更加形象和具体.     

基于视觉密码的RFID安全协议

RFID系统中标签计算能力低、资源受限等对感知层安全带来很多威胁,因此设计一种高效、安全、计算简单的认证协议是保障物联网安全的重点。现有认证协议所采用的加密算法较复杂、运算量大。利用视觉密码无条件安全、解密简单的特性,构造一种新的RFID认证协议,可弥补传统认证协议的不足。使用视觉密码实现标签与读写器之间的认证,并在认证后更新标签中的影子图像,可有效抵御位置跟踪、窃听、重放、非法读取等攻击。该协议具有前向性安全、成本低、安全性好等特点。     

密码的一种制定方法

现代工作生活需要用到很多的密码,怎么样制定一个安全的密码就成了一个重要的问题。我们首先简单了解制定密码的原则,知道了什么是强密码;再了解几种加密的原理,最后用加密基础字符串的方法来产生需要的密码,这就是一种所见即所得制定密码的方法。     

CMOS密码的清除

对CMOS中的两种密码:Setup密码和System密码的作用进行简单介绍,并详细介绍了破解与清除的几种方法。     

浅析椭圆曲线密码体制

针对现在流行的操作系统Windows的CDKey加密体制采用的技术--椭圆曲线密码体制,本文对其原理和应用进行了简单的分析。椭圆曲线密码体制是一种安全度很高的密码技术,易于实现,有良好的应用前景。     

破解CMOS密码的新方法

该方法是针对计算机用户因遗忘(口令)密码或他人私设密码，无法正常启动计算机而设置的一个破解密码的装置，它给计算机用户提供了一种简单易行的破解CMOS密码的新方法；该方法操作简单，实用性强，便于推广。     

破译密码题

<正>密码问题主要涉及密码学中的密码编码和密码破译两类知识,即加密和解密,而利用初中数学知识也可以破译一类密码问题.下面选取几例加以说明.一、密码编码——加密例1(2005年浙江省)在日常生活中如取款、上网等都需要密码.有一种用"因式分解"法产生的密码,方便记忆.原理是:如对于多项式x~4-y~4,因式分解的结果是(x-y)(x+y)(x~2+y~2),若取x=9,y=9时,则各个因式     

靠不住的“我爱你一生一世”

密码与口令 什么是密码?根据《辞海》的解释,密码是"按特定法则编成,用以对通信双方的信息进行秘密变换的符号".换句话说,密码是隐蔽了真实内容的符号序列.是把普通的文字信息通过一种变换手段,变为除通信双方以外其他人都不能读懂的信息编码,这种独特的信息编码就是密码.从这个意义上来说,我们使用的计算机登陆密码、网络游戏密码、银行卡密码,甚至开启保险箱使用的密码都不是真正意义上的密码,而只是一种特定的文字口令.     

《达·芬奇密码》:“神圣女性”回归了吗?

《达·芬奇密码》颠覆了父权制社会以男性中心价值为主导的基督教历史,追溯了被尘封的"神圣女性"的历史。在小说中"神圣女性"代表着两性之间的平等以及权力的平衡。国内学术界大多认为《达·芬奇密码》是"神圣女性"回归的一种信号,在此笔者将从分析《达·芬奇密码》中索菲·奈芙这一角色出发,探寻"神圣女性"是否真的回归。     

几种常用密码算法的研究探

密码算法的目的是为了保护信息的保密性、完整性和安全性,简单地说就是信息的防伪造与防窃取。本文主要讨论几种常用密码算法的特点及实现方法等内容。     

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.