Visual cryptography

About: Visual cryptography is a research topic. Over the lifetime, 1724 publications have been published within this topic receiving 25300 citations.

A review of applications of artificial neural networks in cryptosystems

Abstract: This paper presents a review of the literature on the use of artificial neutral networks in cryptography. Different neural network based approaches have been categorized based on their applications to different components of cryptosystems such as secret key protocols, visual cryptography, design of random generators, digital watermarking, and steganalysis.

Authenticating visual cryptography shares using 2d barcodes

Abstract: One of the problems pertinent with many visual cryptography (VC) schemes is that of authentication. VC provides a way of sharing secrets between a number of participants. The secrets are in the form of an image that is encoded into multiple pieces known as shares. When these shares are physically superimposed, the secret can be instantly observed. A known problem is that of authentication. How is it possible to know that the secret being recovered is genuine? There has been some work devoted to this using so called cheating prevention schemes which attempt to provide a means of traceability or authentication via a set of additional shares that are used to check authenticity. This paper proposes a scheme that attempts to alleviate this suspicion by using 2D barcodes as a means of authentication which may have more practicality in terms of real world usage. Results are provided using an application that is available on mobile devices for portable barcode reading.

A New Copyright Protection Scheme with Visual Cryptography

Abstract: This paper proposes a new efficient and secure copyright protection scheme for digital watermarking by using visual cryptography technique. The proposed scheme has the following merits compare with previous related schemes: (1) The proposed scheme uses simple codebook to generate a watermarked image. (2) The proposed scheme does not need to expand the watermark image. (3) The proposed scheme eliminates two security problems on the previous Lou et al.psilas scheme which that the problem of stability of relationship between discrete wavelet transform (DWT) coefficients and the problem of ambiguity of watermark verification. As a result, the proposed scheme is more efficient and secure compare with previous related schemes.

Optical hiding with visual cryptography

Abstract: We propose an optical hiding method based on visual cryptography. In the hiding process, we convert the secret information into a set of fabricated phase-keys, which are completely independent of each other, intensity-detected-proof and image-covered, leading to the high security. During the extraction process, the covered phase-keys are illuminated with laser beams and then incoherently superimposed to extract the hidden information directly by human vision, without complicated optical implementations and any additional computation, resulting in the convenience of extraction. Also, the phase-keys are manufactured as the diffractive optical elements that are robust to the attacks, such as the blocking and the phase-noise. Optical experiments verify that the high security, the easy extraction and the strong robustness are all obtainable in the visual-cryptography-based optical hiding.