Optical information encryption based on partially-update iterative system with azimuth multiplexing

Abstract

This paper introduces an optical information encryption method based on partially-update iteration system with azimuth multiplexing. Multiple high-definition pictures are stored in multiple QR codes as amplitude constraints, and then encrypted in Fresnel domain by azimuth multiplexing. Due to the proposal of the enhancement system with partial update of the phase mask, the number of pictures can be encrypted increases. The security of the system is guaranteed by azimuth multiplexing, and the multiplexing capacity is jointly guaranteed by phase partial update system and QR code. The decoded QR code can extract the encrypted information without much quality loss. Simulation results show that the scheme has a large-capacity information storage, high security, robustness and practicability.