提出一种新的虚拟光学加密方法，该方法分3个步骤将两幅图像隐藏于3个随机相位板中。将两幅图像分别作为相位和幅度信息隐藏于一个复数场中，利用随机相位板作为参考光，并采用数字全息术将该复数场转换成平稳随机白噪声，利用干涉加密原理进一步将此白噪声储存于2个随机相位板中，从而将两幅图像信息隐藏于3个纯随机相位板中。该方法原理简单，无需进行迭代操作。计算机模拟结果显示：任何一个密钥错误，均无法得到原始图像的任何信息。同时，解密过程对系统中距离及波长等参数非常敏感，较大地提升了系统的安全性。

In this paper a novel virtual optical encryption system was proposed. With the new system two images could be hidden in the three random phase plates. First of all, the two original images were encoded into the amplitude and phase of a complex signal, then the complex signal was transformed into stationary random white noise by using digital holography with the reference wave that generated by random phase plate. Then the white noise was further hided in two random phase plates by using the interference principle. The encryption algorithm for this new method was quite simple and did not require iterative operation. Simulation results prove the encryption effects. The influences of additive parameters on the decryption results are studied, and it is found that the encryption system is highly sensitive to these additive parameters, and the security of the system is further improved.