permutation cipher

基本解释

First a review of developing history and designing principle of block cipher is given and the important function of permutation theory in block cipher is presented in this thesis.
本文首先综述了分组密码的发展历程、设计原理，以及置换理论在这个体制设计中的重要作用。
Through these results, we analyze the cryptographic security of random permutation, present a new explication on the significance of choosing quick trickle permutation in cipher designs.
并依据这些结论分析了随机置换的相关密码安全性，对在密码设计中采用全距置换的意义提供了新的解释；
By these results, the cryptographic security of random permutation is analyzed, and a new explication is presented on the significance of choosing quick trickle permutation in cipher designs.
依据这些结论分析了随机置换的相关密码安全性问题，对在密码设计中采用全距置换的意义提供了新的解释。