Nowadays, security in data transfer is of special importance. Images are of the most
attractive kinds of data in the encryption domain. Color images are more attractive than the …

In this paper we review a number of optical image encryption techniques proposed in the
literature inspired by the architecture of the classic optical Double Random Phase Encoding …

We propose what we believe is a new method for color image encryption by use of
wavelength multiplexing based on lensless Fresnel transform holograms. An image is …

An optical color image encryption method based on Hadamard single-pixel imaging (SPI)
and Arnold transformation is proposed, in which, optical full-color image encryption with …

We propose two approaches for optical encryption based on computational ghost imaging.
These methods have the capability of encoding ghost images reconstructed from gray-scale …

In this paper, we propose a novel method to encrypt a color image based on Arnold
transform (ART) and interference method. A color image is decomposed into three …

A novel method for encoding color information based on a double random phase mask and
a double structured phase mask in a gyrator transform domain is proposed. The amplitude …

Image encryption is a suitable method to protect image data. Image and text data has their
unique features. The available encryption algorithms are good for text data. They may not be …

Lossless encryption methods are more applicable than lossy encryption methods when
marginal distortion is not tolerable. In this research, the authors propose a novel lossless …

A new color image encryption algorithm based on fractional Fourier transform (FrFT) and
chaos is proposed. The colors of the original color image are converted to HSI (hue …