Optica Applicata • Vol 53 • No 3
High-security image encryption by multiplexing phase encoding in domains of dual optical transforms
January 2023 • Zhihui Li, Bin Gao, Xiaoou Pan, Linlin Li, Chenxuan Wang, Weizhuo Zuo, Yu Ji, Shutian Liu, Zhengjun Liu
A novel optical image encryption is proposed based on multiplexing of the random phase encoding with shift and rotation operations in domains of two transforms, extended fractional Fourier transform (eFrFT) and Fresnel transform. The original image is subjected to eFrFT with the action of the random phase mask. The mask is shifted and rotated to enhance the security of this encryption method. The image obtained from eFrFT is entered into Fresnel diffraction by the use of the phase mask to obtain the final encrypte…