Affiliations: Department of Computer Science and Information Engineering, National Chung Cheng University, Chiayi, Taiwan 62107, R.O.C. | Department of Computer Science and Information Engineering, National United University, Miaoli, Taiwan 360, R.O.C. | Department of Computer Science and Information Management, Providence University, Taichung, Taiwan 433, R.O.C.
Abstract: In this paper, a new palette-based image steganography is proposed.
Palette-based images such as GIF files have been widely used on the Internet
and web pages such that all browsers can recognize them. Palette-based images
can be used as good carriers for transmitting secret messages. In this scheme,
the Least Significant Bits (LSBs) of the palette-based image are utilized in
order to hide the secret message by using the computational information hiding
technique. The adaptive hiding capacity can be computed according to different
sizes of the embedding block. Experimental results also show that existing
artifacts in the traditional LSB-based method are unnoticeable. The number of
modification pixels in the embedding process is decreased, while good
stego-image quality is maintained, and the cover image is left unblemished by
camouflaged information. Furthermore, the feature of adaptive hiding capacity
provides the possibility of protecting different sizes of embedded secret
messages.
Keywords: information hiding, palette-based image, steganography
