摘  要

随着信息技术的快速发展，数字图像已经成为了人们日常生活中不可或缺的一部分。然而，数字图像的易复制性和易传播性也给图像的安全性带来了极大的威胁。为了保护数字图像的隐私和安全，数字图像加密技术应运而生。数字图像加密技术是一种通过加密算法对数字图像进行加密处理，使得未经授权的用户无法获取图像中的信息，从而保护数字图像的隐私和安全的技术。

在众多的对称加密算法中，DES算法是最具代表性的一种。DES算法是一种基于分组密码的加密算法，其原理是将明文分成若干组，每组64位，然后对每组进行加密。DES算法的加密过程包括16轮迭代，每轮迭代都使用不同的子密钥对数据进行混淆和置换。DES算法的优点是加密速度快、安全性较高，但密钥长度较短，容易被暴力破解。

本文主要研究了数字图像加密的关键技术，并使用Python编程实现了DES算法。首先，介绍了数字图像加密技术的背景和意义，以及数字图像加密算法的分类和特点。接着，详细阐述了DES算法的原理和实现过程，包括密钥生成、加密和解密过程。然后，提出了基于DES算法的数字图像加密方案，并使用Python编程实现了该方案。最后，通过实验验证了该方案的可行性和有效性。

关键词：数字图像加密；关键技术；Python编程；DES算法；加密方案

Abstract

With the rapid development of information technology, digital image has become an indispensable part of people's daily life. However, the easy replication and propagation of digital images also pose a great threat to the security of images. In order to protect the privacy and security of digital images, digital image encryption technology has emerged. Digital image encryption technology is a kind of encryption algorithm for digital images, so that unauthorized users are unable to obtain the information in the image, so as to protect the privacy and security of digital images.

Among the many symmetric encryption algorithms, the DES algorithm is the most representative one. The DES algorithm is an encryption algorithm based on packet passwords by dividing plaintext into groups of 64 bits, and then encrypt each group. The encryption process of the DES algorithm consists of 16 iterations, each of which confused and replaces the data using different subkeys. The advantages of DES algorithm are fast encryption speed, high security, but the key length is short, easy to be cracked by violence.

This paper studies the key techniques of digital image encryption and implemented the DES algorithm using Python programming. First, the background and significance of digital image encryption technology, as well as the classification and characteristics of digital image encryption algorithm. Then, the principle and implementation of DES algorithm, including key generation, encryption and decryption. Then, a digital image encryption scheme based on the DES algorithm is proposed and implemented using Python programming. Finally, the feasibility and effectiveness of the scheme are verified through experiments.

Key words: digital image encryption; key technology; Python programming; DES algorithm; encryption scheme