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Graduate Projects - Details

Computer Science Program

Project ID: 390
Author: Kamalendar Reddy Kotha
Project Title: Visual Cryptography Tool for Embedded Halftoned Shares
Semester: 2 2012
Committe Chair: Dr. Mario Garcia
Committee Member 1: Dr. David Thomas
Committee Member 2: Dr. Dulal Kar
Project Description: Visual Cryptography is a technique, which is used to conceal the secret image into transparencies (which will vary with the user) and these transparencies are distributed to the intended recipients. In Extended Visual Cryptography Scheme, the transparencies are embedded into the meaningful images so that the intended recipient will have a transparency, which is a meaningful image. Without much computation, only the qualified set of participants can reveal the secret image by simply stacking transparencies. The tool can be used in both ways, to encrypt the secret image into transparencies and also to decrypt the embedded images. Simple steps and operations perform encryption and decryption of images. Halftoning algorithm is used to divide the secret image into transparencies with the help of dither matrix. Dither matrix stores the information of all pixels in the secret image. Using this tool, user can send encrypted images that are in the format of GIF and PNG. The encrypted transparencies can be saved in the machine and can be sent to the intended person by other means. Experimental results reveal that the tool works with gray-scale images in the format of .png and .gif.
Project URL:   390.pdf
 
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