密码学中，由替代密码和置换密码结合使用而构成的一种密码。
In cryptography, a cipher produced by a composition of a number of substitution and transposition ciphers.
置换密码是一种简单的加密技术，采用这项技术将把字母表中的每个字母替换为字母表中的其他字母。
A substitution cypher is a simple encryption technique where every letter of the alphabet is substituted with another letter from the alphabet.
但是简单的置换密码玩起来很有趣，尤其是在RPG环境中给某个人传递一条可以在玩游戏的过程中破解出来的编码信息。
But simple substitution cyphers can be fun to play with, especially in an RPG context by handing someone an encoded message that they can work out during game play.
创建一个数据池，置换测试中的用户ID和密码的值。
Create a data pool to replace the user ID and password value in the test.
布尔置换在密码体制的设计中有着重要的应用。
Boolean permutations have important applications in the design of cryptosystems.
布尔置换在密码体制中有着非常重要的应用。
Boolean permutations are in very important applications in cryptosystems.
最初大家都只知道它的序列很短，是极其微小的RNA控制片断，大家叫它为反义RNA，它通过置换作用而阻止抑制基因的活性，从而阻碍密码子的转录与翻译活动。
It was previously known that short, tiny control RNA, called antisense RNA, can stop the activity of genes by placing themselves so that "reading" of the code is impeded.
替代和置换部分组成了具有良好密码特性的SP网络结构。
The substitution and the permutation formed the SP network architecture with desirable cryptographic property.
核苷酸序列变化主要表现在同义密码子的置换。
The variations of nucleotide mainly occurred the replace of synonymous codons.
结果表明，在所用分组密码是伪随机置换的条件下，方案在分块适应性攻击模型下是可证明安全的。
Investigation shows that the scheme is provable security under the blockwise adaptive attack model if the underlying block cipher is a pseudorandom permutation.
指出了分组密码的多次迭代使对称置换结构复杂化，可以选择对称置换作为分组密码算法的扩散部分来设计。
This paper shows that Hi-times substitute makes permutation structure more complicity, so symmetrical permutation can be chosen as the diffusion module in block cipher algorithm design.
基于这一模型，设计了一个称为基于全非奇异矩阵的代替置换网络的密码结构。
Based on this model, a new crypt structure called completely nonsingular matrix based substitution permutation network is designed.
论文介绍了一种基于全非奇异矩阵的代替置换网络，它可有效的提高分组密码抗线性密码分析的能力。
This paper introduces a completely nonsingular matrix based substitution permutation network that can effectively improve the performance of the block cipher against linear cryptanalysis.
包含代替置换网络的分组密码是一种广泛使用的分组密码系统。
The block cipher with a substitution permutation network is the best known and widely used block cipher system.
指出了使用大规模的基于全奇异矩阵的代替置换网络可有效地提高分组密码抗差分密码分析的安全性。
Therefore, using large completely nonsingular matrix based substitution permutation networks can effectively improve cipher security in relation to differential cryptanalysis.
指出了使用大规模的基于全奇异矩阵的代替置换网络可有效地提高分组密码抗差分密码分析的安全性。
Therefore, using large completely nonsingular matrix based substitution permutation networks can effectively improve cipher security in relation to differential cryptanalysis.
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