查询词典 two bits

It must improve the commonly symmetrical key block cipher arithmetic for ensuring that the data length will not be increased after encryption: using forward shift bits mode in Triple DES with Two Keys; using cipher text stealing mode in RC5 with Cipher Block Chaining.

为保证加密后数据长度不变，应对常用的对称密钥分组密码算法以改进：双密钥三重DES加密采用向前挪位法，RC5密码分组链接加密采用密文窃取方式。

In the fourth chapter, firstly it introduces the Boolean functions algebraic expressions of the 2-value clock-controlled stop-and-go generator and Gunther generator. It reveals the balanced property of the two kinds of Boolean functions, and studies the Walsh cycle spectrum and the autocorrelation function. It also obtains the coincidence rate of their output sequences with affine sum of some bits of input sequences, and analyzes their ability of resisting the best affine approximation cryptanalysis and differential cryptanalysis. Secondly, we properly present a new definition of the Best Affine Approximation, namely BAA on the Boolean vector functions, followed by the spectral characteristic of such defined BAA attacks through using the decomposition formula of the union distribution for random variables. A lower bound of such BAA attacks is proposed. Finally, we also study the spectral characteristic of the second kind of nonlinearity of Boolean vector functions, followed by a higher bound of such nonlinearity. Furthermore, the limited relationship between the second kind of nonlinearity of Boolean vector functions and the linear structure of the linear combination of every component is analyzed.

在第四章中，首先给出了2值密钥流"停走生成器"和"衮特生成器"中实际存在的布尔函数的代数表示，揭示了这两类布尔函数的平衡性，随后研究了它们的Walsh循环谱和自相关函数等，得到了它们的输出序列与输入序列中的某些bit的仿射项的符合率，分析了它们抵抗最佳仿射逼近攻击和差分攻击的能力；其次，我们合理地给出了布尔向量函数最佳仿射逼近的新定义，利用布尔随机变量联合分布的分解式考察了相应的谱特征，并给出了布尔向量函数与其最佳仿射逼近的符合率的一个下界；最后，我们还考察了布尔向量函数第二类非线性度的谱特征，给出了布尔向量函数第二类非线性度的一个上界，并揭示了布尔向量函数第二类非线性度与其各个分量的线性和的线性结构之间存在的制约关系。

We got an old tin lantern, and a butcher-knife without any handle, and a bran-new Barlow knife worth two bits in any store, and a lot of tallow candles, and a tin candlestick, and a gourd, and a tin cup, and a ratty old bedquilt off the bed, and a reticule with needles and pins and beeswax and buttons and thread and all such truck in it, and a hatchet and some nails, and a fishline as thick as my little finger with some monstrous hooks on it, and a roll of buckskin, and a leather dog-collar, and a horseshoe, and some vials of medicine that didn't have no label on them; and just as we was leaving I found a tolerable good curry-comb, and Jim he found a ratty old fiddle-bow, and a wooden leg.

还有不少牛油蜡烛，一个白铁烛台，还有一把葫芦瓢，一只白铁杯子，一条破烂的旧被子丢在床边，一只手提包，里边装着针线、黄蜡、钮扣等等东西。还有一把斧头和一些钉子。还有一根钓鱼竿，跟我的个指头一般粗细，上面还系着几只特别大号的鱼钩。还有一卷鹿皮，一只牛皮做的狗项圈，一只马蹄铁。还有几只没有标签的药瓶。正要离开的时候，我找到了一只马梳子，东西还可以。杰姆找到了一把破旧的提琴弓，还有一只木制假腿。

Firstly, chaotic kinetic characteristic of Kent mapping is analyzed, using it to encrypt watermark image; Secondly, an algorithm of only modifying the decimal part of DC components is given, bringing the least error, effectively solving the problem which embedding watermark in DC components is easy to the image's block effect; Watermark is extracted without original image utilizing two-bits algorithm.

深入分析了帐篷映射的混沌动力学特性，并将其应用于水印图像的预处理；在分析了 DCT域嵌入对策的基础上提出了一种只修改 DC 分量小数部分的嵌入算法，引入的误差小，有效的解决了以往人们在 DC 分量嵌入水印容易引起图像块效应的问题；检测过程中利用二值离散算法使得水印提取时无需原始图像。

Dibit: A group of two bits .

变数元：两个数元的组合。

It realizes a reconfigurable embedded system by embedding the thirty-two bits processor and other application IP discreteness in FPGA.

通过将32位高性能处理器在内的多种应用模块嵌入到一片通用的FPGA内，从而实现了一个完全可重置的嵌入式系统。

The energy state of an electron within an atom, represented by the electron energy level or shell, can theoretically represent one, two, four, eight, or even 16 bits of data.

用电子能级表示的原子中电子的能态，理论上可以表示1、2、4、8、甚至16位的数据。

Mr Ellison is keen on two bits of Sun's software portfolio in particular.

埃里森先生对于Sun的两个软件特别感兴趣。

And there came a poor widow, and she put in two little bits of money, which make a farthing.

12：42 有一个穷寡妇来、往里投了两个小钱、就是一个大钱。

A bit inserter segments a received data bit stream into at least two subframes, and inserts the generated specific bits at locations where an error probability is higher in the respective subframes.

位插入器将接收的数据位流分段成至少两个子帧，并将生成的特定位插在各个子帧中出错几率较高的位置上。

When this condition occurs, inbound replication with the source partner is stopped on the destination domain controller and event ID 2042 is logged in the Directory Services event log.

计算机密码学是研究计算机信息加密、解密及其变换的科学，是数学和计算机的交义学科，也是一门新兴的学科。

Instructions: click on the thumbnails to see a larger image, then use the left-right arrow keys to scroll through the slideshow.

使用说明：滑鼠点在小图上即可放大观赏。开启后键盘左右键可用来换照片。