【摘要】 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(CA)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,又用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,使得密钥空间至少达到2H×2512×233 554 432。模拟结果表明,该方案具有良好的细胞自动机雪崩效应的特性,即局部规则的微小改变将导致密文的大幅度变化,且具有易于实践、成本低等优点。由于有序细胞自动机具有平行结构简单、密钥量大和加密速度快的特点,所以这种加密技术非常适用于光学实现领域的应用。更多还原

【Abstract】 Due to the universality of Cellular Automaton(CA) model,many applications have been found in traditional cryptography and image processing.Combined with Cellular Automaton Transform (CAT) compression technologies,an image encryption approach with enhanced security and more larger key space at least 2H×2512×233 554 432 is proposed based on sequential CA.The simulation results show that the proposed scheme has the advantages of convenient realization,avalanche effect,confusion and diffusion properties,and low cost,which is suitable for optical realization based on the characteristics of simple parallelism structure of sequential CA,very large security key space and fast encryption speed.更多还原