基于有序细胞自动机的图像加密方案

细胞自动机可以通过考虑一个系统的局部状态和整体状态之间的关系来展现该系统的复杂行为。正是由于细胞自动机的这种普适性，使得其在传统的密码学及图像处理中也得到了广泛的应用。本文中，我们结合Lafe给出的基于细胞自动机变换的压缩技巧提出了一个新的、基于有序细胞自动机的图像加密方案。新的方案既利用了基于细胞自动机的变换对二维图像具有良好压缩效果的特点，又提出了有序细胞自动机的加密技术弥补了Lafe方案中加密效果不理想的缺点。由于细胞自动机具有简单的平行结构、易于实践、密钥量大、加密速度快和成本低的特点，所以这种加密技术非常适用于光学实现领域的应用。

An Image Encryption Scheme Based on Sequential CA

Cellular Automata (CA) can exhibit fascinatingly complex behavior by dealing with the relations between the part and the whole. Due to the universality of CA model, many applications has been found in traditional cryptography and image processing. Combined with Cellular Automata Transforms (CAT) compression technologies, we propose an image encryption approach with enhanced security and much larger key space based on sequential CA The proposed image encryption scheme is suitable for optical realization based on the characteristics of simple parallelism structure of CA and satisfies the characteristics of convenient realization, very large number of security keys, fast encryption speed and low cost.