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 …

Information security with optical means, such as double random phase encoding, has been
investigated by various researchers. It has been demonstrated that optical technology …

A new multi-image encryption scheme based on quaternion discrete fractional Hartley
transform (QDFrHT) and an improved pixel adaptive diffusion is proposed, which can …

We propose a double image encryption by using random binary encoding and gyrator
transform. Two secret images are first regarded as the real part and imaginary part of …

We introduce for the first time the concept of an information “container” before a standard
optical encrypting procedure. The “container” selected is a QR code which offers the main …

A quantum representation model for multiple images is firstly proposed, which could save
more storage space than the existing quantum image representation models and allow …

A novel image encryption method is proposed by utilizing random phase encoding in the
fractional Fourier domain to encrypt two images into one encrypted image with stationary …

Secure communication is of great importance in the modern world. Many methods,
techniques, and systems are used for secure communication, many of which cannot be used …

We propose an optical multiple-image encryption scheme based on computational ghost
imaging with the position multiplexing. In the encryption process, each plain image is …

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 …