1. Introduction | 简介 Simplified DES (SDES) is a simplified version of the Data Encryption Standard (DES), designed to help understand the DES encrypti
Introduction | 简介 Symmetric encryption is a widely used cryptographic technique where the same secret key is employed for both encryption and decrypti
1. 引言 | Introduction 随着计算机和互联网的广泛应用，网络安全（Network Security） 成为了信息技术领域的重要课题。本章介绍了计算机安全的基本概念、网络安全模型、安全攻击及其防护措施。 With the widespread use of computers and
