加密领域还真的有这样的方法。
你去查这篇2019年的论文看。里面就做了你说的这件事情
Silhouette-free interference-based multiple-image encryption using cascaded fractional Fourier transforms
文章第二页里这句话是描述
In the second layer using interference, the amplitude h𝐾+1 is decomposed into two phase-only masks denoted as exp (iM1 ) and exp (iM2 ), where the corresponding phase distributions are considered as the ciphertext images.
公式15~17描述的就是这个过程,但是公式18的有点问题。需要先进行几次逆傅立叶变换才能解出来。