An efficient and secure visual secret sharing scheme suitable for transmission of color images is introduced and discussed in this paper. The scheme employs number theory concepts and the pixel level representation of the color image to derive reciprocal encryption and decryption procedures. Using the input color image, the scheme generates n shares which are then distributed to participants. A...

The paper proposed a secure technique for color images using DCTDWT technique and AES-128 bit Key encryption algorithm for improving security of system. Host image converted to YIQ after embedding using DWT. The quality of watermark measured by metrics such as; structural similarity (SSIM) and quaternion structural similarity (QSSIM).This improves traditional methods. Experimental results prove...

The need of exchanging messages and images secretly over unsecure networks promoted the creation of cryptosystems to enable receivers to interpret the exchanged information. In this paper, a particular public key cryptosystem called the ElGamal Cryptosystem is presented considered with the help MATLAB Program to be used over Images. Since the ElGamal cryptosystem over a primitive root of a larg...

Vectorial metasurface holograms ar realized through segmenting or interleaving nanostructures to modulate spatial polarization of the reconstructed holography on imaging plane, but it is still a challenge achieve full-color vectorial meta-holograms with subwavelength meta-molecules and independent control images. Here, this problem solved by multiplexing hologram phase for one circularly polari...

This paper introduces a new {k, n}-secret sharing scheme for color images. The proposed method encrypts the color image into n color shares. The secret information is recovered only if the k (or more) allowed shares are available for decryption. The proposed method utilizes the conventional {k, n}-secret sharing strategy by operating at the bit-levels of the decomposed color image. Modifying th...

Nowadays, with the development of Internet technology and the improvement of safety awareness, image encryption technique has become very important, especially for color image encryption. The direction of research is focused on the RGB color space. There are few researches in other color spaces, such as HSVL*a*b*, YCbCr. In this paper, we propose a color image encryption method in YCbCr color s...

Visual cryptography is a kind of image encryption technology. It is characterized by the process of decryption that is overlapping the encrypted images and restores the secret by the human vision. Kafri and Keren proposed three random grid algorithms to encrypt a binary secret image in 1987. The advantage of their research is that the encrypted images with random grid will not be excessive expa...

Visual Cryptography is a special encryption technique to hide information in images, which divide secret image into multiple layers. Each layer holds some information. The receiver aligns the layers and the secret information is revealed by human vision without any complex computation. The proposed algorithm is for color image, that presents a system which takes four pictures as an input and ge...