2008_ICCCE_Stealth steganography in visual cryptography for half tone images

Abstract:
A novel approach for detection of cheating in visualcryptography based on steganography for hidingdigital signature of the secret image is proposed. Theproposed technique hides the verification bits of thesignature in the different shares of the participants.For hiding binary “0”, no flipping of the subpixel isdone in the block of the share, but change is done forhiding binary “1” by flipping a white (black) subpixelin one of the blocks of black (white) share The hiddensignature can be recovered in the presence of allshares and verified by comparing with thereconstructed digital signature in case of doubt.

來源:http://biotech.csie.mcu.edu.tw/