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Journal of Information Science and Engineering, Vol. 26 No. 4, pp. 1199-1212 (July 2010)

Transforming LSB Substitution for Image-based Steganography in Matching Algorithms*

CHENG-HSING YANG AND SHIUH-JENG WANG+
Department of Computer Science
National Pingtung University of Education
Pingtung, 900 Taiwan
+Department of Information Management
Central Police University
Taoyuan, 333 Taiwan

Simple least-significant-bit (LSB) substitution is a method used to embed secret data in least significant bits of pixels in a host image. The LSB approaches typically achieve high capacity. A simple LSB substitution, which hides secret data directly into LSBs, is easily implemented but will result in bad quality of the stego-image. In order to reduce the degradation of the host image after embedding, an LSB substitution scheme was proposed by Wang et al. They proposed a genetic algorithm to search for approximate solutions. Also, Chang et al. proposed a dynamic programming strategy to efficiently obtain a solution. In this paper, we propose a more general model of Wang et al.s LSB substitution scheme, called as transforming LSB substitution. In order to overcome the problem associated with the two previous approaches of a long running time, a more efficient approach, referred to as the matching approach, is proposed to find a better solution. Some experiments, demonstrations and analyses are shown in this paper to demonstrate our new scheme and approach.

Keywords: information hiding, least-significant-bit (LSB), matching algorithm, image intellectual rights, security

Full Text () Retrieve PDF document (201007_03.pdf)

Received July 29, 2008; revised November 3, 2008; accepted January 22, 2009.
Communicated by H. Y. Mark Liao.
* This paper was supported in part by the National Science Council of Taiwan, R.O.C. under the Grant NSC 95-2221-E-015-002-MY2, NSC 97-2221-E-153-001, and NSC 97-2221-E-015-001.
+ Corresponding author.