Showing papers by "Tzung-Her Chen published in 2011"
TL;DR: A threshold RG-based VSS scheme aiming at providing the wide-use version is presented, and the experimental results and theoretically analysis in visual quality and security show that the proposed scheme performs well.
203 citations
TL;DR: An efficient (n+1, n+1) multi-secret image sharing scheme based on Boolean-based VSS is proposed to not only keep the secret images confidential but also increase the capacity of sharing multiple secrets.
134 citations
TL;DR: This paper has focused on proposing a novel RGVSS scheme by skillfully designing a procedure of distinguishing different light transmissions on shared images based on the pixel values of the logo image with two primary advantages: no pixel expansion, and being user-friendly.
Abstract: Recently, the visual secret sharing (VSS) technique based on a random-grid algorithm (RGVSS), proposed by Kafri and Keren in 1987, has drawn attention in academia again. However, Kafri and Keren's scheme is not participant-friendly; that is to say, the generated shared images are meaningless, so users feel that this huge amount of data is hard to manage. The literature has illustrated the concept of creating meaningful shared images, in which some shape or information appears for easing management, for VSS technique by visual cryptography (VCVSS). Those friendly VCVSS schemes are not directly suitable for RGVSS. Instead, a new friendly RGVSS must be designed. Most friendly VCVSS schemes worsen the pixel expansion problem, in which the size of shared images is larger than that of the original secret image, to achieve the goal of generic meaningful shares. As a result, in this paper we have focused on proposing a novel RGVSS scheme by skillfully designing a procedure of distinguishing different light transmissions on shared images based on the pixel values of the logo image with two primary advantages: no pixel expansion, and being user-friendly. In order to illustrate the correctness, the formal analysis is demonstrated while the experimental results show the proposed schemes do work.
97 citations