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 …

An asymmetric scheme has been proposed for optical double images encryption in the
gyrator wavelet transform (GWT) domain. Grayscale and binary images are encrypted …

We propose a watermarking scheme for phase images, based on the use of devil's vortex
Fresnel lens (DVFL) as a phase mask. The DVFL provides much-desired parameter-rich …

In this study, we propose a new nonlinear optical image encryption technique using spiral
phase transform (SPT). First, the primary image is phase encoded and multiplied with a …

An asymmetric optical cryptosystem to encrypt images using devil's vortex Fresnel lens
(DVFLs) phase masks and lower upper decomposition with partial pivoting (LUDPP) is …

Fibonacci zone plates are proving to be promising candidates in image forming devices. In
this letter we show that the set of Fibonacci zone plates are a particular member of a new …

A frequency plane phase mask based on Devil's vortex structure has been used for image
encryption using the fractional Mellin transform. The phase key for decryption is obtained by …

We propose a multiple-image encryption scheme with asymmetric keys and demonstrate it
by optical experiments. The original secret images are multiplexed and encoded into a real …

To enhance the security in optical image encryption scheme and to safeguard it from the
invaders, this paper proposes a new scheme using devil's toroidal lens masks (DTLMs) and …

A cryptosystem for securing image encryption is considered by using double random phase
encoding in Fresnel wavelet transform (FWT) domain. Random phase masks (RPMs) and …