Open AccessOptical Image Encryption With Divergent Illumination and Asymmetric Keys
Author(s) -
Xiaogang Wang,
Guoquan Zhou,
Chaoqing Dai,
Junlang Chen
Publication year - 2017
Publication title -
ieee photonics journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.725
H-Index - 73
eISSN - 1943-0655
pISSN - 1943-0647
DOI - 10.1109/jphot.2017.2684179
Subject(s) - engineered materials, dielectrics and plasmas , photonics and electrooptics
A flexible optical encryption system based on divergent illumination and asymmetric encoding is proposed. The input image is encrypted by use of two random phase masks (RPMs) located at the input and the conjugate plane in a diverging spherical wave field. Compared with the counterparts using planar illumination and symmetric keys, a significant difference is that continuous change of positions of optical elements applied for encryption is allowed, resulting in decryption keys that are different from the encryption keys (or their conjugates) and variable size display of encrypted/decrypted images. A detailed mathematical description and calculation results with different bandwidths of the system support our proposal.