Recently, biometric systems are extensively and commonly utilized for authentication and
verification applications. The security issue and the dependence on a specific biometric for …

Fully-phase image encryption is considered more secure as compared to an amplitude
image encryption. In the present paper, an encryption scheme is proposed for double phase …

Aiming at the problem of secure transmission and distribution of complex keys in image
encryption system based on optical transformation, an innovative optical image encryption …

We propose a method for fully phase image encryption based on double random-structured
phase mask encoding in the gyrator transform (GT) domain. The security of the system is …

A single channel optical asymmetric cryptosystem for color image in fractional Fourier
transform (FrFT) domain is presented. Instead of commonly used RGB channels encryption …

In recent years, the operation efficiency of chaos-based image cryptosystems has drawn
much more concerns. However, the workload arised from floating point arithmetic in chaotic …

In this paper, we propose an optical asymmetric single-channel cryptosystem based on QZ
synthesis (QZS) for color images. In our cryptosystem, a QZS method for synthesizing color …

We propose a novel color image hiding scheme with three channels of cascaded Fresnel
domain phase-only filtering. The original color image is encoded into three phase masks by …

An enhanced asymmetric cryptosystem for color image is proposed by using equal modulus
decomposition (EMD) in the gyrator transform domains. In this scheme, the EMD is …

A novel multiple color image cryptosystem based on coupled-logistic-map-biometric keys
(CBK), QR decomposition with column pivoting and optical Fresnel transform (FT), is …