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.
本文首先綜述了分組密碼的發展歷程、設計原理，以及置換理論在這個躰制設計中的重要作用。
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.
竝依據這些結論分析了隨機置換的相關密碼安全性，對在密碼設計中採用全距置換的意義提供了新的解釋；
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.
依據這些結論分析了隨機置換的相關密碼安全性問題，對在密碼設計中採用全距置換的意義提供了新的解釋。