查询词典 a cipher

Encryption Algorithm simple description : DES is a block cipher algorithm, his 64 for a pair of data encryption Encryption algorithm principle :The password system may divide into 2 big kinds from the principle, namely single key password system and double key password system.

加密算法的简单描述：DES是一种分组加密算法，他以64位为分组对数据加密。加密算法的原理：密码体制从原理上可分为2大类，即单钥密码体制和双钥密码体制。

Considering that magic cube is easy to disarrange and hard to solve, I designed the Magic Cube Stream Cipher: the main part is a virtual cube filled with data; by turning the magic cube many times, original data are disarranged and new ones are generated; new data serve as current secret key, which is a part of the key stream.

我根据魔方"打乱容易恢复难"的特性，设计了魔方流密码算法：主体是一个由数据构成的虚拟魔方；利用多次魔方变换改变数据"魔方"的整体状态并生成新的数据；以此作为本次加密运算的密钥。

In cryptography,the additional characters added to a plaintext message,to ensure that its length is an integral number of blocks for encryption by a block cipher.

在密码学中，为了使明文信息的长度为分组密码加密中所用的块的整数倍，而在明文中添加的附加字符。

At last, a method on creation and calculation of a kind of irrational number is researched. The digit number of the extension of this irrational number is random on certain basis. Therefore, a stream cipher is designed, which uses the extension digit of the irrational number as the key stream.

最后本文在研究一种无理数的生成方法和计算方法的基础上，利用该类无理数在某基底的展开序列中各个位的数字具有良好的随机统计特性的特点，提出了一种以这类无理数的展开数字流作为密钥流的序列密码设计方法，并对生成的密钥流的统计特性进行了分析和测试。

He made codes like Justinian, he dictated like Caesar, his conversation was mingled with the lightning-flash of Pascal, with the thunderclap of Tacitus, he made history and he wrote it, his bulletins are Iliads, he combined the cipher of Newton with the metaphor of Mahomet, he left behind him in the East words as great as the pyramids, at Tilsit he taught Emperors majesty, at the Academy of Sciences he replied to Laplace, in the Council of State be held his own against Merlin, he gave a soul to the geometry of the first, and to the chicanery of the last, he was a legist with the attorneys and sidereal with the astronomers; like Cromwell blowing out one of two candles, he went to the Temple to bargain for a curtain tassel; he saw everything; he knew everything; which did not prevent him from laughing good-naturedly beside the cradle of his little child; and all at once, frightened Europe lent an ear, armies put themselves in motion, parks of artillery rumbled, pontoons stretched over the rivers, clouds of cavalry galloped in the storm, cries, trumpets, a trembling of thrones in every direction, the frontiers of kingdoms oscillated on the map, the sound of a superhuman sword was heard, as it was drawn from its sheath; they beheld him, him, rise erect on the horizon with a blazing brand in his hand, and a glow in his eyes, unfolding amid the thunder, his two wings, the grand army and the old guard, and he was the archangel of war!

他象查士丁尼那样制定法典，象恺撒那样独理万机，他的谈吐兼有帕斯加尔的闪电和塔西佗的雷霆，他创造历史，也写历史，他的战报是诗篇，他把牛顿的数字和穆罕默德的妙喻糅合在一起，他在东方留下了象金字塔那样高大的训谕；他在提尔西特把朝仪教给各国帝王，他在科学院里和拉普拉斯争鸣，他在国务会议上和梅尔兰辩论，他经心整饬纪律，悉力排难解纷，他象检察官一样了解法律，象天文学家一样了解天文；象克伦威尔吹灭两支蜡烛中的一支那样，他也到大庙①去为一粒窗帘珠子讨价还价；他见到一切，他知道一切，这并不妨碍他伏在他小儿子的摇篮上笑得象个天真烂漫的人；突然，惊骇中的欧洲屏息细听，大军源源开拔了，炮队纷纷滚动了，长江大河上建起了浮桥，狂风中驰聘着漫山遍野的骑兵，叫喊声，号角声，所有的宝座全震动了，所有的王国的国境线全在地图上摇晃起来了，人们听到一把超人的宝剑的出鞘声，人们看见他屹立在天边，手里烈焰飞腾，眼里光芒四射，霹雳一声，展开了他的两翼，大军和老羽林军，威猛天神也不过如此！

In the meantime, we got several achievements during the process:Firstly, a sequence encryption algorithm of real-time video in use of one dimension piece-wise linear chaotic map is carried out. This algorithm makes use of Inter' s SSE2 special dictates and makes nonlinear change of chaotic sequences.As a result, the algorithm not only encrypts faster, but also resists several cipher analysis methods. Secondly, this paper presents a block encryption algorithm of real-time video based on chaotic neural network which makes use of numerical transient chaotic neural network to produce chaotic sequences and uses these sequences to do encryption.

同时，在实现系统的过程中，取得了以下研究成果：(1)提出了一种利用一维的分段线性混沌映射来对实时视频进行序列加密的算法，该算法利用Inter的SSE2专用指令集来实现，并对产生的混沌序列进行了有效的非线性变换，从而使该算法不仅加密速度快，并且能有效的抗多种密码分析；(2)提出了一种利用混沌神经网络对实时视频进行分组加密的算法。

To begin with, theory of FCSR and its sequence is summarized and investigated. Furthermore, emphasis is placed on the vaule of 2-adic complexity. A conclusion is drawn that the vaule lies in the relation between 2-adic complexity and lineai complexity of a same seqence. Fact that there exists sequence with high linear complexity but low 2-adic complexity is given and analyzed. The value of 2-adic complexity in cryptanalysis can be directly drawn from the very fact. A series of problems are opened based on the value and discussions are done in various depth. Some good results are obtained in these problems such as the 2-adic complexity distribution of periodic sequences and the stability of 2-adic complexity. The value of FCSR in stream cipher design is discussed at the same time.

首先对FCSR及其序列理论进行了系统的总结和研究，然后重点探讨了2-adic复杂度的流密码意义，通过论证表明，存在线性复杂度较大而2-adic复杂度较小的序列类，从而明确了2-adic复杂度的流密码分析意义，进而提出了一系列相关的研究问题并进行了不同深度的探讨，对其中周期序列的2-adic复杂度分布和2-adic复杂度的稳定性等问题得到了较好的结果；同时对FCSR的流密码设计意义进行了探讨，对其中的问题给出了一些思路或简单结论。

In a typical example emphasized index of coincidence in Kerckhoff assumption to cryptanalyze the polyalphabetic substitution cipher, the Vigenère cipher for exemple.

针对一个典型实例重点讲解重合指数法在Kerckhoff假设下破解多表代换（以Vigenère密码为例）方面的应用。

Stream cipher trivium design manual and C source code contains a stream cipher design principles and security analysis.

详细说明：流密码算法trivium的设计手册和C源代码，包含了流密码的设计原则和安全性分析。

No one is impressed if a random person creates an cipher he can't break; but if one of the world's best cryptographers creates an cipher he can't break, now that's worth looking at.

随便一个什么都可能设计一个自己无法破解的密码算法，但没有人会把它放在心上，而假如世界上最好的密码学家之一设计了一个自己无法破解的密码算法，那么它就值得关注了。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。