置换密码(permutation cipher)加密和解密算法，对英文文章中小写字母加密，输入中文将出错，接受到密文的一方，只有知道密钥句子才能解密。-Replacement password (permutation cipher) encryption and decryption algorithms, written in English letters encryption small article, enter the Chinese will go wrong, the party received ciphertext, only know the key to decrypt the sentence.