Authors
B Padhmavati, P Nirmal Kumar, MA Dorai Rangaswamy
Publication date
2010/12
Journal
ACEEE International Journal on Signal and Image Processing
Volume
1
Issue
03
Pages
1-5
Description
Visual cryptography (VC) is a method of encrypting a secret image into shares such that stacking a sufficient number of shares reveals the secret image. Shares are usually presented in transparencies. Each participant holds a transparency. In this paper, we studied the cheating problem in VC by malicious adversaries. We considered the attacks of malicious adversaries who may deviate from the scheme and create fake shares, whose stacking reveals a different Secret image. This paper proposes a solution to this Cheating problem by an Invisible and Blind Watermarking scheme. This scheme not only provides Authentication for the VC shares but also makes these secret shares invisible by embedding them into not so significant Host images. Thus secret shares are not available for any alterations by the adversaries who try to create fake shares. In the proposed invisible and blind watermarking scheme, every pixel of the binary VC share is invisibly embedded into the individual blocks of the host image sized 2x2. In this proposed scheme, the process of watermark extraction necessitates only the watermarked image and it doesn t require the original host image or any of its characteristics, making the proposed scheme blind. The efficiency of the proposed Cheating prevention scheme by Invisible Blind watermarking scheme has been demonstrated via the experimental results. A Perfect restoration technique is added to the Visual Cryptography Scheme to improve the quality of the restored secret image as well as memory space utilization. Hence the proposed Cheating prevention scheme along with Perfect restoration techniques provides a …
Total citations
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Scholar articles
B Padhmavati, PN Kumar, MAD Rangaswamy - ACEEE International Journal on Signal and Image …, 2010