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Based on chaotic theory combined with one time password authentication technology, an identity authentication scheme was presented which can resist attacks in common and resolve ordinary one time password unresisting small number attack and insecurity problems of transmitting plaintext iteration times and easily finding the security leak of collisions in traditional Hash function.

基于混沌理论和一次性口令认证技术，提出一种可以抵御常见攻击的身份认证方案。

The second encoding technique assigned a number to each plaintext character and then used these numbers to specify the placement of the Cardan grille on the table.

第二种编码方法是给每个明文字母指定一个号码，用这些号码指定卡丹格板在表上的位置。

Security analyses of a variant of a new block cipher system based on cellular automata theory are given using two cryptanalytic approaches. The results show that this variant of CAC is very insecure under chosen-plaintext attacks.

利用两种方法对一个基于细胞自动机的分组密码系统CAC的变形进行了分析，结果表明：CAC的这种变形在选择明文攻击下是极不安全的。

Secondly, the pseudo-chaotic stream cipher based on searching plaintext in a pseudo-random symbolic sequence is analyzed, by several successful cryptanalytic attacks such as one-time pad attacks, bifurcation diagram attacks, entropy attacks, differential attacks and key recovery attacks etc..

第二章研究了基于搜索机制的数字混沌序列密码算法，并详细分析了包括一次一密攻击，分叉图攻击，熵攻击，差分攻击以及基于符号动力学的攻击方法。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。