在普通高中数学教材新增加的《信息安全与密码》实施后,近几年部分省市的数学中考试题中,出现了有关信息安全与密码的考题.这就要求学生初步了解加密与解密,明文与密文,密钥等知识,能完成简单的明文转换成密文和密文转换成明文,这样向广大初中数 In the ordinary high school mathematics textbooks added “information security and password” after the implementation in recent years, some provinces and cities in mathematics exam questions, there has been a test of information security and password.This requires students to understand the initial encryption and decryption, plaintext And ciphertext, key and other knowledge, to complete a simple plaintext conversion into ciphertext and ciphertext into plaintext, so to the majority of junior high school