As the application of orthomorphic permutations in cryptography, we simply emphasize the advantage provided by such permutation in increasing the security of a block cipher. 简要强调了利用正形置换强化分组密码的优点；利用正形置换设计了一种密码安全布尔函数。
We develop a necessary and sufficient condition under which an orthomorphic permutation is linear, and also improve the method available of constructing nonlinear orthomorphic permutations. 给出了一类线性正形置换的计数方法；对现有的非线性正形置换的构造方法进行了改进；
