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Symmetry 2017, 9(10), 223; doi:10.3390/sym9100223

Reversible Dual-Image-Based Hiding Scheme Using Block Folding Technique

1
Department of Information Management, Chaoyang University of Technology, Taichung 41349, Taiwan
2
Department of Mathematics, National Changhua University of Education, Changhua 50058, Taiwan
*
Author to whom correspondence should be addressed.
Received: 19 September 2017 / Revised: 6 October 2017 / Accepted: 9 October 2017 / Published: 12 October 2017
(This article belongs to the Special Issue Information Technology and Its Applications)

Abstract

The concept of a dual-image based scheme in information sharing consists of concealing secret messages in two cover images; only someone who has both stego-images can extract the secret messages. In 2015, Lu et al. proposed a center-folding strategy where each secret symbol is folded into the reduced digit to reduce the distortion of the stego-image. Then, in 2016, Lu et al. used a frequency-based encoding strategy to reduce the distortion of the frequency of occurrence of the maximum absolute value. Because the folding strategy can obviously reduce the value, the proposed scheme includes the folding operation twice to further decrease the reduced digit. We use a frequency-based encoding strategy to encode a secret message and then use the block folding technique by performing the center-folding operation twice to embed secret messages. An indicator is needed to identify the sequence number of the folding operation. The proposed scheme collects several indicators to produce a combined code and hides the code in a pixel to reduce the size of the indicators. The experimental results show that the proposed method can achieve higher image quality under the same embedding rate or higher payload, which is better than other methods. View Full-Text
Keywords: dual stego-images; information hiding; center-folding strategy; block folding dual stego-images; information hiding; center-folding strategy; block folding
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Lu, T.-C.; Leng, H.-S. Reversible Dual-Image-Based Hiding Scheme Using Block Folding Technique. Symmetry 2017, 9, 223.

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