Novel Approach for Color Extended Visual Cryptography Using Error Diffusion.

International Journal of Computer Trends and Technology (IJCTT)          
© - Issue 2012 by IJCTT Journal
Volume-3 Issue-4                           
Year of Publication : 2012
Authors :Dr.D.Vasumathi, M.Surya Prakash Rao, M.Upendra Kumar,Dr.Y.Ramadevi, Dr.R.Rajeswara Rao


Dr.D.Vasumathi, M.Surya Prakash Rao, M.Upendra Kumar,Dr.Y.Ramadevi, Dr.R.Rajeswara Rao"Novel Approach for Color Extended Visual Cryptography Using Error Diffusion."International Journal of Computer Trends and Technology (IJCTT),V3(4):385-389 Issue 2012 .ISSN Published by Seventh Sense Research Group.

Abstract: -Visual cryptography, an emerging cryptography technology, uses the characteristics of human vision to decrypt encrypted images. Cryptography is the study of mathematical techniques related aspects of Information Security such as confidentiality, data security, entity authentication and data origin authentication, but it is not the only means of providing information security, rather one of the techniques. Visual cryptography is a new technique which provides information security which uses simple algorithm unlike the complex, computationally intensive algorithms used in other techniques like traditional cryptography. Previous methods in the literature show good results for black and white or gray scale VC schemes, however, they are not sufficient to be applied directly to color shares due to different color structures. Some methods for color visual cryptography are not satisfactory in terms of producing either meaningless shares or meaningful shares with low visual quality, leading to suspicion of encryption. Color visual cryptography (VC) encrypts a color secret message into color halftone image shares. This project introduces the concept of visual information pixel (VIP) synchronization and error diffusion to attain a color visual cryptography encryption method that produces meaningful color shares with high visual quality. VIP synchronization retains the positions of pixels carrying visual information of original images throughout the color channels and error diffusion generates shares pleasant to human eyes. Comparisons with previous approaches show the superior performance of the new method.


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KeywordsColor meaningful shares, digital halftoning, error diffusion, secret sharing, visual cryptography (VC).