A halftone visual cryptography schema using ordered dither

Abstract

Visual cryptography is a cryptographic technique which allows visual information to be encrypted in such a way that the decryption can be performed by the human visual system, without the aid of computers. This paper proposes a schema of information hiding within the method of visual cryptography. The gray image is changed into two halftone images via the different dither matrixes respectively, and the secret binary pixels are encoded into shares. The secret information can be restored by stacking the different shared halftone images together. Simulation results show that the secret binary image can be decoded efficiently.

Design and Implementation of a Secure QR Payment Based on Visual Cryptography

“…Less shares accumulated than t will prevent the concealed image from being viewed. The (t, n)-VCS ((t, n)-threshold visual cryptography system) is the name given to this [9]. Consider the basic two-out of-two visual threshold method, in which each image pixel is stored into a pair of subpixels in each of the two shares.…”

“…Due to their speed and simplicity, QR codes have found significant usage in a number of crucial sectors, including health, education, and finance [4,5,6,7,8]. There are a number of secure QR-based online payment options available [9][10][11][12][13][14][15]. Each of the several payment alternatives offered by [9] offers differing levels of security and quickness.…”

“…There are a number of secure QR-based online payment options available [9][10][11][12][13][14][15]. Each of the several payment alternatives offered by [9] offers differing levels of security and quickness. These models include the Operator Centric Model and the Peer-to-Peer Model.…”

Secure QR Code Scheme Based on Visual Cryptography

“…The detailed principle of visual encryption is that the secret image is divided into several share images by cryptographic operations and distributed to different participants. The pixels of each share image appear to be randomly distributed [8]. Decryption is possible by stacking an adequate number of shares.…”