Visual cryptography with extra ability of hiding confidential data

Abstract

We present a two-in-one visual cryptography (VC) scheme that not only shares an image of moderate confidentiality between two noisy transparencies, but also hides in these two transparencies a more confidential text file describing the image. None of the transparencies alone can reveal anything about the image or text. Later, people can view the image by simply stacking the two transparencies; on the other hand, after certain simple computations, the more confidential text data can also be extracted. We also introduce an alternative version in which the decoding of both the image and text requires no computer.

A novel authenticatable color visual secret sharing scheme using non-expanded meaningful shares

“…Visual cryptography with extra ability of hiding confidential data [8] In Fang and Lins' scheme, it not only shares secret image by two noisy share images, but also hides an extra confidential data for authentication. People who gather the two share images can reveal the secret image by stacking the two share images.…”

“…Section 2 reviews the related works of error diffusion halftone techniques, visual cryptography with extra ability of hiding confidential data [8], and new data hiding scheme using pixel swapping [2]. Section 3 describes the proposed visual secret sharing for modifying diffusion, secret sharing based on pixel swapping to provide authentication, the process to enhance the quality of share image by modifying diffusion, and the proposed color visual secret sharing.…”

“…[19,27] improve the weakness of pixel expansion, but still suffer from meaningless share images. Briefly, the proposed scheme simultaneously achieves the specialties of (1) meaningful share images, (2) no pixel expansion, (3) the more quantity of hiding extra confidential image than [8] under the same transmission cost, (4) applying to share color secret image, and (5) providing authentication ability.…”

“…Fang and Lins' [8] visual cryptography scheme not only shares the secret image, but also provides extra ability of hiding confidential data. This scheme separates a secret image into two share images, and embeds the extra confidential data for authentication.…”

ESSVCS: An Enriched Secret Sharing Visual Cryptography

“…The comparisons between our ESSVCS and the TiOISSS will be given in Section 4. Fang et al [5,21] also tried to make use of the pseudo-random inputs to carry confidential data. Unfortunately, the scheme is only for (2,2) access structure.…”