数字图像置乱技术，作为数字图像信息隐藏的预处理和后处理，其主要目的是将一幅有意义的图像变成一幅杂乱无章的图像，用以增加数字图像信息隐藏算法抵抗非法攻击的能力，从而增加安全性。本文以图像信息安全问题为背景，介绍了通常用于分组密码系统中的S盒的理论基础，提出了一种基于S盒的数字图像置乱方法，同时讨论了置乱算法的周期性。实验结果表明，算法具有很好的置乱效果。

The main aim of digital image scrambling, which is used as the pre-processing or post-processing in image information hiding, is to transform a meaningful image into a meaningless or disordered image in order to enhance the power to resist invalid attack and in turn enhance the security. This paper introduces the academic foundation of S-box that is usually applied to group cryptosystem with image information security as its background, and then presents a method of digital image scrambling based on S-box and discusses the periodicity of the arithmetic. The algorithm is proved to be efficient with experiments.