International Journal of Computer Applications
Visual cryptography was first proposed by the researcher. In this technique message is encoded in the form of shares and decoded by human visual system. So it does not require any cryptographic computation to decode the secret image. The encoded shares are distributed to different users. User cannot obtain any information from their share alone each because share shows only random noise. This is a simple and perfectly secure technique for secret sharing. Pixel expansion has been one of the problems of visual cryptography that is yet to be properly addressed. Existing methods to deal with this problem either have security vulnerabilities and/or produce results of poor quality.