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Mathematical Problems in Engineering
Volume 2016 (2016), Article ID 4313580, 11 pages
http://dx.doi.org/10.1155/2016/4313580
Research Article

A New Reversible Date-Hiding Algorithm for Encrypted Images

School of Computer and Communication, Lanzhou University of Technology, Lanzhou 730050, China

Received 26 February 2016; Accepted 3 August 2016

Academic Editor: Haipeng Peng

Copyright © 2016 Laicheng Cao and Hao Zhou. 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.

Abstract

In order to effectively increase embedding capacity and completely extract the watermarking information in information hiding of encrypted images, a new reversible watermarking embedding algorithm based on rhombus prediction model and difference histogram shifting ideas is proposed. Firstly, the images are pretreated according to rhombus prediction model. Then, the watermarking information is embedded in encrypted images by effective combination of homomorphism encryption scheme and reversible watermarking techniques. Finally, the watermarking information is completely extracted and the images are recovered based on computed difference histogram from left to right and from top to bottom. So, the efficiency and reversibility are ensured when watermarking information is embedded in encrypted image. Experiment results show that the proposed algorithm is simple and easy to realize, the embedding capacity is effectively increased, watermarking information is completely reversible, and the image can be recovered with no distortion.