A New Data Hiding Scheme for Small Blocks of Twelve Pixels on Binary Images by Module Approach

摘要

Color and binary images are popular subjects for data hiding. In this paper we propose a method to controlling quality of hiding secret data in binary images by using small blocks of 12 pixels with a restriction that in each block at most two pixels are changed to embed 6 secret bits in case it is successful. The method uses the Z_2 module Z_2~6 of integers modulo 2 and this shows the way to overcome the limit (12,6)2 which can not reached by error correcting block codes approach. The method presents the way used secret keys for small blocks which remain high safety property of the scheme. The scheme can be modified to control high quality of stego palette images by combining with Optimal Parity Assignment (OPA) approach for hiding secret data in palette images, to prevent from steganalysis.