Optical interference-based multiple-image encryption using spherical wave illumination and gyrator transform

Abstract

A new optical interference-based multiple-image encryption using spherical wave illumination and gyrator transform is proposed. In this proposal, each secret color image is divided into normalized red, green, and blue component images and independently encoded into corresponding phase-only component images. Then each phase-only component image of all the images are combined together to produce a single-phase-only component image as an input component image, which is bounded with a random phase mask to form a complex image. The two phase-only masks are analytically obtained from the inverse Fourier transformation of the complex image. The host image is chosen as the first phase-only mask, and the complex image hidden in the host image is regarded as the second phase-only mask. The spherical wave is generated to simultaneously illuminate phase-only masks. Then two modulated masks are gyrator transformed. The corresponding transformed images are phase truncated to obtain encrypted images and amplitude truncated to construct decryption keys. The decryption keys, angles of gyrator transform, wavelength and radius of the spherical wave, and individual decryption keys for authorized users are sensitive keys, which enhance the security layers of the system. The proposed system can be implemented by using optoelectronic architecture. Numerical simulation results demonstrate the flexibility of the system.

Secure storage and retrieval schemes for multiple encrypted digital holograms with orthogonal phase encoding multiplexing

“…Therefore, it is necessary to develop a security system that can be used to store and retrieve the encrypted 3D images. attention due to the improvement of encryption capacity, the facilitation of transmission, and efficient storage of mass information [22][23][24][25][26][27][28][29]. Several multiple-image encryption systems have a disadvantage in that there is crosstalk noise between images, or a time-consuming iterative process is required due to the use of the phase-retrieval algorithm.…”

Optical interference-based image encryption using circular harmonic expansion and spherical illumination in gyrator transform domain

“…With the expectation to thoroughly resolve this problem at the source, two different triple-POM based methods have been reported recently, which do not need any time-consuming digital computation or post processing of POMs [17,20]. Furthermore, some IBE schemes have been devised for multiple-image or color image encryption by combining with polarized light encoding [21], POM multiplexing [22], position multiplexing [23] and phase-only encoding techniques [24]. Chen et al devised a novel IBE scheme using three-dimensional phase retrieval and an FrFT-based IBE scheme [25], in which a series of random and fixed phase-only masks are applied in the optical paths, to enhance the security of conventional IBE algorithms [26,27].…”

Fully phase multiple information encoding based on superposition of two beams and Fresnel-transform domain

“…Various algorithms based on multiple-image encryption in the Fresnel transform (FrT) [30][31][32][33][34][35], Fourier transform (FT) [36,37], fractional Fourier transform (FRT) [38,39], and gyrator transform (GT) [40] domains have been proposed. Recently, a novel multiple image hiding system based on the diffraction model of direction multiplexing method has been presented [41].…”