置换密码算法的原理是不改变明文字符，只将字符在明文中的排列顺序改变，从而实现明文信息的加密。置换密码也叫换位密码。试编程实现矩阵换位密码。它的加密方法是将明文中的字母按照给定的顺序安排在一个矩阵中，然后用根据密钥提供的顺序重新组合矩阵中的字母，形成密文。-Permutation cipher does not change the principle is expressly characters, only characters in the explicit change in order to achieve explicit information encryption. Password replacement is also called transposition password. Programming test matrix transposition password. Its encryption method is to express the letter in accordance with the order given in a matrix, and then use the key provided in accordance with the order re-arrangement of the letters in the matrix to form a ciphertext.