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Mathematical Problems in Engineering
Volume 2014 (2014), Article ID 240749, 11 pages
Research Article

A Novel Encryption Frame for Medical Image with Watermark Based on Hyperchaotic System

College of Software, Nankai University, Wei Jin Road No. 94, Nankai District, Tianjin 300071, China

Received 5 January 2014; Accepted 19 March 2014; Published 9 April 2014

Academic Editor: Jui-Sheng Lin

Copyright © 2014 Shun Zhang et al. 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.


An encryption frame of medical image with watermark based on hyperchaotic system is proposed in this paper. Medical information, such as the patients’ private information, data needed for diagnosis, and information for authentication or protection of medical files, is embedded into the regions of interest (ROI) in medical images with a high capacity difference-histogram-based reversible data-hiding scheme. After that, the watermarked medical images are encrypted with hyperchaotic systems. In the receiving end, the receiver with encryption key can decrypt the image to get similar images for diagnosis. If the receiver has the key for data hiding at the same time, he/she can extract the embedded private information and reversibly recover the original medical image. Experiments and analyses demonstrate that high embedding capacity and low distortion have been achieved in the process of data hiding, and, at the same time, high security has been acquired in the encryption phase.