光学信息处理技术本身具有高速度、并行性、信息容量大的特点。同时，光波又具有振幅、相位、波长、偏振等多种属性，是多维信息的载体。因此，光学加密在信息安全传输领域意义重大。现有的图像加密方法存在效率低、安全性差、加密容量小等问题。为了实现多图像二次加密传输，提出了一种基于级联相位迭代与计算关联成像的多图像加密算法。该方法可以同时对多幅图像进行高效加密，计算简单，安全可靠，传输数据少。利用相关系数指标评估了该方法的加密效果，并通过仿真实验验证了该方法的有效性和安全性。

Optical information processing technology has the characteristics of high speed and parallelism. The wavelength of light is short and the information capacity is large. At the same time, it has many attributes such as amplitude, phase, wavelength and polarization, which could be the carrier of multi-dimensional information. Therefore, optical encryption is of great significance in the field of information security transmission and is widely used in the field of image encryption. For multiple image encryption, this paper proposes a multi image encryption algorithm based on cascaded phase iteration and computational ghost imaging. This method can encrypt multiple images efficiently at the same time, which is simple, safe and reliable, and has less transmission data. The encryption effect of this method is evaluated by using correlation coefficient, and the effectiveness and security of this method are verified by simulation.