目录引言一、PyCrypto库概述1. PyCrypto介绍2. 安装PyCrypto二、基础加密算法1. 对称加密a. AES加密2. 非对称加密a. RSA算法三、哈希与消息认证码（MAC）1. 哈希函数a. SHA-2562. 消息认证码（MAC）a. HMAC四、高级应
Let\'s assume I have a database with two tables: categories and articles. Every article belongs to a category.
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